/**
 * vis-timeline and vis-graph2d
 * https://visjs.github.io/vis-timeline/
 *
 * Create a fully customizable, interactive timeline with items and ranges.
 *
 * @version 8.5.0
 * @date    2025-12-12T13:44:42.806Z
 *
 * @copyright (c) 2011-2017 Almende B.V, http://almende.com
 * @copyright (c) 2017-2019 visjs contributors, https://github.com/visjs
 *
 * @license
 * vis.js is dual licensed under both
 *
 *   1. The Apache 2.0 License
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *   and
 *
 *   2. The MIT License
 *      http://opensource.org/licenses/MIT
 *
 * vis.js may be distributed under either license.
 */

import moment$3 from 'moment';
import { isDataViewLike as isDataViewLike$1, DataSet, createNewDataPipeFrom, DataView } from 'vis-data/peer/esm/vis-data.js';

var commonjsGlobal = typeof globalThis !== 'undefined' ? globalThis : typeof window !== 'undefined' ? window : typeof global !== 'undefined' ? global : typeof self !== 'undefined' ? self : {};

function getDefaultExportFromCjs (x) {
	return x && x.__esModule && Object.prototype.hasOwnProperty.call(x, 'default') ? x['default'] : x;
}

var es_array_isArray = {};

var globalThis_1;
var hasRequiredGlobalThis;

function requireGlobalThis () {
	if (hasRequiredGlobalThis) return globalThis_1;
	hasRequiredGlobalThis = 1;
	var check = function (it) {
	  return it && it.Math === Math && it;
	};

	// https://github.com/zloirock/core-js/issues/86#issuecomment-115759028
	globalThis_1 =
	  // eslint-disable-next-line es/no-global-this -- safe
	  check(typeof globalThis == 'object' && globalThis) ||
	  check(typeof window == 'object' && window) ||
	  // eslint-disable-next-line no-restricted-globals -- safe
	  check(typeof self == 'object' && self) ||
	  check(typeof commonjsGlobal == 'object' && commonjsGlobal) ||
	  check(typeof globalThis_1 == 'object' && globalThis_1) ||
	  // eslint-disable-next-line no-new-func -- fallback
	  (function () { return this; })() || Function('return this')();
	return globalThis_1;
}

var fails;
var hasRequiredFails;

function requireFails () {
	if (hasRequiredFails) return fails;
	hasRequiredFails = 1;
	fails = function (exec) {
	  try {
	    return !!exec();
	  } catch (error) {
	    return true;
	  }
	};
	return fails;
}

var functionBindNative;
var hasRequiredFunctionBindNative;

function requireFunctionBindNative () {
	if (hasRequiredFunctionBindNative) return functionBindNative;
	hasRequiredFunctionBindNative = 1;
	var fails = /*@__PURE__*/ requireFails();

	functionBindNative = !fails(function () {
	  // eslint-disable-next-line es/no-function-prototype-bind -- safe
	  var test = (function () { /* empty */ }).bind();
	  // eslint-disable-next-line no-prototype-builtins -- safe
	  return typeof test != 'function' || test.hasOwnProperty('prototype');
	});
	return functionBindNative;
}

var functionApply;
var hasRequiredFunctionApply;

function requireFunctionApply () {
	if (hasRequiredFunctionApply) return functionApply;
	hasRequiredFunctionApply = 1;
	var NATIVE_BIND = /*@__PURE__*/ requireFunctionBindNative();

	var FunctionPrototype = Function.prototype;
	var apply = FunctionPrototype.apply;
	var call = FunctionPrototype.call;

	// eslint-disable-next-line es/no-function-prototype-bind, es/no-reflect -- safe
	functionApply = typeof Reflect == 'object' && Reflect.apply || (NATIVE_BIND ? call.bind(apply) : function () {
	  return call.apply(apply, arguments);
	});
	return functionApply;
}

var functionUncurryThis;
var hasRequiredFunctionUncurryThis;

function requireFunctionUncurryThis () {
	if (hasRequiredFunctionUncurryThis) return functionUncurryThis;
	hasRequiredFunctionUncurryThis = 1;
	var NATIVE_BIND = /*@__PURE__*/ requireFunctionBindNative();

	var FunctionPrototype = Function.prototype;
	var call = FunctionPrototype.call;
	// eslint-disable-next-line es/no-function-prototype-bind -- safe
	var uncurryThisWithBind = NATIVE_BIND && FunctionPrototype.bind.bind(call, call);

	functionUncurryThis = NATIVE_BIND ? uncurryThisWithBind : function (fn) {
	  return function () {
	    return call.apply(fn, arguments);
	  };
	};
	return functionUncurryThis;
}

var classofRaw;
var hasRequiredClassofRaw;

function requireClassofRaw () {
	if (hasRequiredClassofRaw) return classofRaw;
	hasRequiredClassofRaw = 1;
	var uncurryThis = /*@__PURE__*/ requireFunctionUncurryThis();

	var toString = uncurryThis({}.toString);
	var stringSlice = uncurryThis(''.slice);

	classofRaw = function (it) {
	  return stringSlice(toString(it), 8, -1);
	};
	return classofRaw;
}

var functionUncurryThisClause;
var hasRequiredFunctionUncurryThisClause;

function requireFunctionUncurryThisClause () {
	if (hasRequiredFunctionUncurryThisClause) return functionUncurryThisClause;
	hasRequiredFunctionUncurryThisClause = 1;
	var classofRaw = /*@__PURE__*/ requireClassofRaw();
	var uncurryThis = /*@__PURE__*/ requireFunctionUncurryThis();

	functionUncurryThisClause = function (fn) {
	  // Nashorn bug:
	  //   https://github.com/zloirock/core-js/issues/1128
	  //   https://github.com/zloirock/core-js/issues/1130
	  if (classofRaw(fn) === 'Function') return uncurryThis(fn);
	};
	return functionUncurryThisClause;
}

var isCallable;
var hasRequiredIsCallable;

function requireIsCallable () {
	if (hasRequiredIsCallable) return isCallable;
	hasRequiredIsCallable = 1;
	// https://tc39.es/ecma262/#sec-IsHTMLDDA-internal-slot
	var documentAll = typeof document == 'object' && document.all;

	// `IsCallable` abstract operation
	// https://tc39.es/ecma262/#sec-iscallable
	// eslint-disable-next-line unicorn/no-typeof-undefined -- required for testing
	isCallable = typeof documentAll == 'undefined' && documentAll !== undefined ? function (argument) {
	  return typeof argument == 'function' || argument === documentAll;
	} : function (argument) {
	  return typeof argument == 'function';
	};
	return isCallable;
}

var objectGetOwnPropertyDescriptor = {};

var descriptors;
var hasRequiredDescriptors;

function requireDescriptors () {
	if (hasRequiredDescriptors) return descriptors;
	hasRequiredDescriptors = 1;
	var fails = /*@__PURE__*/ requireFails();

	// Detect IE8's incomplete defineProperty implementation
	descriptors = !fails(function () {
	  // eslint-disable-next-line es/no-object-defineproperty -- required for testing
	  return Object.defineProperty({}, 1, { get: function () { return 7; } })[1] !== 7;
	});
	return descriptors;
}

var functionCall;
var hasRequiredFunctionCall;

function requireFunctionCall () {
	if (hasRequiredFunctionCall) return functionCall;
	hasRequiredFunctionCall = 1;
	var NATIVE_BIND = /*@__PURE__*/ requireFunctionBindNative();

	var call = Function.prototype.call;
	// eslint-disable-next-line es/no-function-prototype-bind -- safe
	functionCall = NATIVE_BIND ? call.bind(call) : function () {
	  return call.apply(call, arguments);
	};
	return functionCall;
}

var objectPropertyIsEnumerable = {};

var hasRequiredObjectPropertyIsEnumerable;

function requireObjectPropertyIsEnumerable () {
	if (hasRequiredObjectPropertyIsEnumerable) return objectPropertyIsEnumerable;
	hasRequiredObjectPropertyIsEnumerable = 1;
	var $propertyIsEnumerable = {}.propertyIsEnumerable;
	// eslint-disable-next-line es/no-object-getownpropertydescriptor -- safe
	var getOwnPropertyDescriptor = Object.getOwnPropertyDescriptor;

	// Nashorn ~ JDK8 bug
	var NASHORN_BUG = getOwnPropertyDescriptor && !$propertyIsEnumerable.call({ 1: 2 }, 1);

	// `Object.prototype.propertyIsEnumerable` method implementation
	// https://tc39.es/ecma262/#sec-object.prototype.propertyisenumerable
	objectPropertyIsEnumerable.f = NASHORN_BUG ? function propertyIsEnumerable(V) {
	  var descriptor = getOwnPropertyDescriptor(this, V);
	  return !!descriptor && descriptor.enumerable;
	} : $propertyIsEnumerable;
	return objectPropertyIsEnumerable;
}

var createPropertyDescriptor;
var hasRequiredCreatePropertyDescriptor;

function requireCreatePropertyDescriptor () {
	if (hasRequiredCreatePropertyDescriptor) return createPropertyDescriptor;
	hasRequiredCreatePropertyDescriptor = 1;
	createPropertyDescriptor = function (bitmap, value) {
	  return {
	    enumerable: !(bitmap & 1),
	    configurable: !(bitmap & 2),
	    writable: !(bitmap & 4),
	    value: value
	  };
	};
	return createPropertyDescriptor;
}

var indexedObject;
var hasRequiredIndexedObject;

function requireIndexedObject () {
	if (hasRequiredIndexedObject) return indexedObject;
	hasRequiredIndexedObject = 1;
	var uncurryThis = /*@__PURE__*/ requireFunctionUncurryThis();
	var fails = /*@__PURE__*/ requireFails();
	var classof = /*@__PURE__*/ requireClassofRaw();

	var $Object = Object;
	var split = uncurryThis(''.split);

	// fallback for non-array-like ES3 and non-enumerable old V8 strings
	indexedObject = fails(function () {
	  // throws an error in rhino, see https://github.com/mozilla/rhino/issues/346
	  // eslint-disable-next-line no-prototype-builtins -- safe
	  return !$Object('z').propertyIsEnumerable(0);
	}) ? function (it) {
	  return classof(it) === 'String' ? split(it, '') : $Object(it);
	} : $Object;
	return indexedObject;
}

var isNullOrUndefined;
var hasRequiredIsNullOrUndefined;

function requireIsNullOrUndefined () {
	if (hasRequiredIsNullOrUndefined) return isNullOrUndefined;
	hasRequiredIsNullOrUndefined = 1;
	// we can't use just `it == null` since of `document.all` special case
	// https://tc39.es/ecma262/#sec-IsHTMLDDA-internal-slot-aec
	isNullOrUndefined = function (it) {
	  return it === null || it === undefined;
	};
	return isNullOrUndefined;
}

var requireObjectCoercible;
var hasRequiredRequireObjectCoercible;

function requireRequireObjectCoercible () {
	if (hasRequiredRequireObjectCoercible) return requireObjectCoercible;
	hasRequiredRequireObjectCoercible = 1;
	var isNullOrUndefined = /*@__PURE__*/ requireIsNullOrUndefined();

	var $TypeError = TypeError;

	// `RequireObjectCoercible` abstract operation
	// https://tc39.es/ecma262/#sec-requireobjectcoercible
	requireObjectCoercible = function (it) {
	  if (isNullOrUndefined(it)) throw new $TypeError("Can't call method on " + it);
	  return it;
	};
	return requireObjectCoercible;
}

var toIndexedObject;
var hasRequiredToIndexedObject;

function requireToIndexedObject () {
	if (hasRequiredToIndexedObject) return toIndexedObject;
	hasRequiredToIndexedObject = 1;
	// toObject with fallback for non-array-like ES3 strings
	var IndexedObject = /*@__PURE__*/ requireIndexedObject();
	var requireObjectCoercible = /*@__PURE__*/ requireRequireObjectCoercible();

	toIndexedObject = function (it) {
	  return IndexedObject(requireObjectCoercible(it));
	};
	return toIndexedObject;
}

var isObject$1;
var hasRequiredIsObject;

function requireIsObject () {
	if (hasRequiredIsObject) return isObject$1;
	hasRequiredIsObject = 1;
	var isCallable = /*@__PURE__*/ requireIsCallable();

	isObject$1 = function (it) {
	  return typeof it == 'object' ? it !== null : isCallable(it);
	};
	return isObject$1;
}

var path;
var hasRequiredPath;

function requirePath () {
	if (hasRequiredPath) return path;
	hasRequiredPath = 1;
	path = {};
	return path;
}

var getBuiltIn;
var hasRequiredGetBuiltIn;

function requireGetBuiltIn () {
	if (hasRequiredGetBuiltIn) return getBuiltIn;
	hasRequiredGetBuiltIn = 1;
	var path = /*@__PURE__*/ requirePath();
	var globalThis = /*@__PURE__*/ requireGlobalThis();
	var isCallable = /*@__PURE__*/ requireIsCallable();

	var aFunction = function (variable) {
	  return isCallable(variable) ? variable : undefined;
	};

	getBuiltIn = function (namespace, method) {
	  return arguments.length < 2 ? aFunction(path[namespace]) || aFunction(globalThis[namespace])
	    : path[namespace] && path[namespace][method] || globalThis[namespace] && globalThis[namespace][method];
	};
	return getBuiltIn;
}

var objectIsPrototypeOf;
var hasRequiredObjectIsPrototypeOf;

function requireObjectIsPrototypeOf () {
	if (hasRequiredObjectIsPrototypeOf) return objectIsPrototypeOf;
	hasRequiredObjectIsPrototypeOf = 1;
	var uncurryThis = /*@__PURE__*/ requireFunctionUncurryThis();

	objectIsPrototypeOf = uncurryThis({}.isPrototypeOf);
	return objectIsPrototypeOf;
}

var environmentUserAgent;
var hasRequiredEnvironmentUserAgent;

function requireEnvironmentUserAgent () {
	if (hasRequiredEnvironmentUserAgent) return environmentUserAgent;
	hasRequiredEnvironmentUserAgent = 1;
	var globalThis = /*@__PURE__*/ requireGlobalThis();

	var navigator = globalThis.navigator;
	var userAgent = navigator && navigator.userAgent;

	environmentUserAgent = userAgent ? String(userAgent) : '';
	return environmentUserAgent;
}

var environmentV8Version;
var hasRequiredEnvironmentV8Version;

function requireEnvironmentV8Version () {
	if (hasRequiredEnvironmentV8Version) return environmentV8Version;
	hasRequiredEnvironmentV8Version = 1;
	var globalThis = /*@__PURE__*/ requireGlobalThis();
	var userAgent = /*@__PURE__*/ requireEnvironmentUserAgent();

	var process = globalThis.process;
	var Deno = globalThis.Deno;
	var versions = process && process.versions || Deno && Deno.version;
	var v8 = versions && versions.v8;
	var match, version;

	if (v8) {
	  match = v8.split('.');
	  // in old Chrome, versions of V8 isn't V8 = Chrome / 10
	  // but their correct versions are not interesting for us
	  version = match[0] > 0 && match[0] < 4 ? 1 : +(match[0] + match[1]);
	}

	// BrowserFS NodeJS `process` polyfill incorrectly set `.v8` to `0.0`
	// so check `userAgent` even if `.v8` exists, but 0
	if (!version && userAgent) {
	  match = userAgent.match(/Edge\/(\d+)/);
	  if (!match || match[1] >= 74) {
	    match = userAgent.match(/Chrome\/(\d+)/);
	    if (match) version = +match[1];
	  }
	}

	environmentV8Version = version;
	return environmentV8Version;
}

var symbolConstructorDetection;
var hasRequiredSymbolConstructorDetection;

function requireSymbolConstructorDetection () {
	if (hasRequiredSymbolConstructorDetection) return symbolConstructorDetection;
	hasRequiredSymbolConstructorDetection = 1;
	/* eslint-disable es/no-symbol -- required for testing */
	var V8_VERSION = /*@__PURE__*/ requireEnvironmentV8Version();
	var fails = /*@__PURE__*/ requireFails();
	var globalThis = /*@__PURE__*/ requireGlobalThis();

	var $String = globalThis.String;

	// eslint-disable-next-line es/no-object-getownpropertysymbols -- required for testing
	symbolConstructorDetection = !!Object.getOwnPropertySymbols && !fails(function () {
	  var symbol = Symbol('symbol detection');
	  // Chrome 38 Symbol has incorrect toString conversion
	  // `get-own-property-symbols` polyfill symbols converted to object are not Symbol instances
	  // nb: Do not call `String` directly to avoid this being optimized out to `symbol+''` which will,
	  // of course, fail.
	  return !$String(symbol) || !(Object(symbol) instanceof Symbol) ||
	    // Chrome 38-40 symbols are not inherited from DOM collections prototypes to instances
	    !Symbol.sham && V8_VERSION && V8_VERSION < 41;
	});
	return symbolConstructorDetection;
}

var useSymbolAsUid;
var hasRequiredUseSymbolAsUid;

function requireUseSymbolAsUid () {
	if (hasRequiredUseSymbolAsUid) return useSymbolAsUid;
	hasRequiredUseSymbolAsUid = 1;
	/* eslint-disable es/no-symbol -- required for testing */
	var NATIVE_SYMBOL = /*@__PURE__*/ requireSymbolConstructorDetection();

	useSymbolAsUid = NATIVE_SYMBOL &&
	  !Symbol.sham &&
	  typeof Symbol.iterator == 'symbol';
	return useSymbolAsUid;
}

var isSymbol;
var hasRequiredIsSymbol;

function requireIsSymbol () {
	if (hasRequiredIsSymbol) return isSymbol;
	hasRequiredIsSymbol = 1;
	var getBuiltIn = /*@__PURE__*/ requireGetBuiltIn();
	var isCallable = /*@__PURE__*/ requireIsCallable();
	var isPrototypeOf = /*@__PURE__*/ requireObjectIsPrototypeOf();
	var USE_SYMBOL_AS_UID = /*@__PURE__*/ requireUseSymbolAsUid();

	var $Object = Object;

	isSymbol = USE_SYMBOL_AS_UID ? function (it) {
	  return typeof it == 'symbol';
	} : function (it) {
	  var $Symbol = getBuiltIn('Symbol');
	  return isCallable($Symbol) && isPrototypeOf($Symbol.prototype, $Object(it));
	};
	return isSymbol;
}

var tryToString;
var hasRequiredTryToString;

function requireTryToString () {
	if (hasRequiredTryToString) return tryToString;
	hasRequiredTryToString = 1;
	var $String = String;

	tryToString = function (argument) {
	  try {
	    return $String(argument);
	  } catch (error) {
	    return 'Object';
	  }
	};
	return tryToString;
}

var aCallable;
var hasRequiredACallable;

function requireACallable () {
	if (hasRequiredACallable) return aCallable;
	hasRequiredACallable = 1;
	var isCallable = /*@__PURE__*/ requireIsCallable();
	var tryToString = /*@__PURE__*/ requireTryToString();

	var $TypeError = TypeError;

	// `Assert: IsCallable(argument) is true`
	aCallable = function (argument) {
	  if (isCallable(argument)) return argument;
	  throw new $TypeError(tryToString(argument) + ' is not a function');
	};
	return aCallable;
}

var getMethod;
var hasRequiredGetMethod;

function requireGetMethod () {
	if (hasRequiredGetMethod) return getMethod;
	hasRequiredGetMethod = 1;
	var aCallable = /*@__PURE__*/ requireACallable();
	var isNullOrUndefined = /*@__PURE__*/ requireIsNullOrUndefined();

	// `GetMethod` abstract operation
	// https://tc39.es/ecma262/#sec-getmethod
	getMethod = function (V, P) {
	  var func = V[P];
	  return isNullOrUndefined(func) ? undefined : aCallable(func);
	};
	return getMethod;
}

var ordinaryToPrimitive;
var hasRequiredOrdinaryToPrimitive;

function requireOrdinaryToPrimitive () {
	if (hasRequiredOrdinaryToPrimitive) return ordinaryToPrimitive;
	hasRequiredOrdinaryToPrimitive = 1;
	var call = /*@__PURE__*/ requireFunctionCall();
	var isCallable = /*@__PURE__*/ requireIsCallable();
	var isObject = /*@__PURE__*/ requireIsObject();

	var $TypeError = TypeError;

	// `OrdinaryToPrimitive` abstract operation
	// https://tc39.es/ecma262/#sec-ordinarytoprimitive
	ordinaryToPrimitive = function (input, pref) {
	  var fn, val;
	  if (pref === 'string' && isCallable(fn = input.toString) && !isObject(val = call(fn, input))) return val;
	  if (isCallable(fn = input.valueOf) && !isObject(val = call(fn, input))) return val;
	  if (pref !== 'string' && isCallable(fn = input.toString) && !isObject(val = call(fn, input))) return val;
	  throw new $TypeError("Can't convert object to primitive value");
	};
	return ordinaryToPrimitive;
}

var sharedStore = {exports: {}};

var isPure;
var hasRequiredIsPure;

function requireIsPure () {
	if (hasRequiredIsPure) return isPure;
	hasRequiredIsPure = 1;
	isPure = true;
	return isPure;
}

var defineGlobalProperty;
var hasRequiredDefineGlobalProperty;

function requireDefineGlobalProperty () {
	if (hasRequiredDefineGlobalProperty) return defineGlobalProperty;
	hasRequiredDefineGlobalProperty = 1;
	var globalThis = /*@__PURE__*/ requireGlobalThis();

	// eslint-disable-next-line es/no-object-defineproperty -- safe
	var defineProperty = Object.defineProperty;

	defineGlobalProperty = function (key, value) {
	  try {
	    defineProperty(globalThis, key, { value: value, configurable: true, writable: true });
	  } catch (error) {
	    globalThis[key] = value;
	  } return value;
	};
	return defineGlobalProperty;
}

var hasRequiredSharedStore;

function requireSharedStore () {
	if (hasRequiredSharedStore) return sharedStore.exports;
	hasRequiredSharedStore = 1;
	var IS_PURE = /*@__PURE__*/ requireIsPure();
	var globalThis = /*@__PURE__*/ requireGlobalThis();
	var defineGlobalProperty = /*@__PURE__*/ requireDefineGlobalProperty();

	var SHARED = '__core-js_shared__';
	var store = sharedStore.exports = globalThis[SHARED] || defineGlobalProperty(SHARED, {});

	(store.versions || (store.versions = [])).push({
	  version: '3.44.0',
	  mode: IS_PURE ? 'pure' : 'global',
	  copyright: '© 2014-2025 Denis Pushkarev (zloirock.ru)',
	  license: 'https://github.com/zloirock/core-js/blob/v3.44.0/LICENSE',
	  source: 'https://github.com/zloirock/core-js'
	});
	return sharedStore.exports;
}

var shared;
var hasRequiredShared;

function requireShared () {
	if (hasRequiredShared) return shared;
	hasRequiredShared = 1;
	var store = /*@__PURE__*/ requireSharedStore();

	shared = function (key, value) {
	  return store[key] || (store[key] = value || {});
	};
	return shared;
}

var toObject;
var hasRequiredToObject;

function requireToObject () {
	if (hasRequiredToObject) return toObject;
	hasRequiredToObject = 1;
	var requireObjectCoercible = /*@__PURE__*/ requireRequireObjectCoercible();

	var $Object = Object;

	// `ToObject` abstract operation
	// https://tc39.es/ecma262/#sec-toobject
	toObject = function (argument) {
	  return $Object(requireObjectCoercible(argument));
	};
	return toObject;
}

var hasOwnProperty_1;
var hasRequiredHasOwnProperty;

function requireHasOwnProperty () {
	if (hasRequiredHasOwnProperty) return hasOwnProperty_1;
	hasRequiredHasOwnProperty = 1;
	var uncurryThis = /*@__PURE__*/ requireFunctionUncurryThis();
	var toObject = /*@__PURE__*/ requireToObject();

	var hasOwnProperty = uncurryThis({}.hasOwnProperty);

	// `HasOwnProperty` abstract operation
	// https://tc39.es/ecma262/#sec-hasownproperty
	// eslint-disable-next-line es/no-object-hasown -- safe
	hasOwnProperty_1 = Object.hasOwn || function hasOwn(it, key) {
	  return hasOwnProperty(toObject(it), key);
	};
	return hasOwnProperty_1;
}

var uid;
var hasRequiredUid;

function requireUid () {
	if (hasRequiredUid) return uid;
	hasRequiredUid = 1;
	var uncurryThis = /*@__PURE__*/ requireFunctionUncurryThis();

	var id = 0;
	var postfix = Math.random();
	var toString = uncurryThis(1.1.toString);

	uid = function (key) {
	  return 'Symbol(' + (key === undefined ? '' : key) + ')_' + toString(++id + postfix, 36);
	};
	return uid;
}

var wellKnownSymbol;
var hasRequiredWellKnownSymbol;

function requireWellKnownSymbol () {
	if (hasRequiredWellKnownSymbol) return wellKnownSymbol;
	hasRequiredWellKnownSymbol = 1;
	var globalThis = /*@__PURE__*/ requireGlobalThis();
	var shared = /*@__PURE__*/ requireShared();
	var hasOwn = /*@__PURE__*/ requireHasOwnProperty();
	var uid = /*@__PURE__*/ requireUid();
	var NATIVE_SYMBOL = /*@__PURE__*/ requireSymbolConstructorDetection();
	var USE_SYMBOL_AS_UID = /*@__PURE__*/ requireUseSymbolAsUid();

	var Symbol = globalThis.Symbol;
	var WellKnownSymbolsStore = shared('wks');
	var createWellKnownSymbol = USE_SYMBOL_AS_UID ? Symbol['for'] || Symbol : Symbol && Symbol.withoutSetter || uid;

	wellKnownSymbol = function (name) {
	  if (!hasOwn(WellKnownSymbolsStore, name)) {
	    WellKnownSymbolsStore[name] = NATIVE_SYMBOL && hasOwn(Symbol, name)
	      ? Symbol[name]
	      : createWellKnownSymbol('Symbol.' + name);
	  } return WellKnownSymbolsStore[name];
	};
	return wellKnownSymbol;
}

var toPrimitive$6;
var hasRequiredToPrimitive$5;

function requireToPrimitive$5 () {
	if (hasRequiredToPrimitive$5) return toPrimitive$6;
	hasRequiredToPrimitive$5 = 1;
	var call = /*@__PURE__*/ requireFunctionCall();
	var isObject = /*@__PURE__*/ requireIsObject();
	var isSymbol = /*@__PURE__*/ requireIsSymbol();
	var getMethod = /*@__PURE__*/ requireGetMethod();
	var ordinaryToPrimitive = /*@__PURE__*/ requireOrdinaryToPrimitive();
	var wellKnownSymbol = /*@__PURE__*/ requireWellKnownSymbol();

	var $TypeError = TypeError;
	var TO_PRIMITIVE = wellKnownSymbol('toPrimitive');

	// `ToPrimitive` abstract operation
	// https://tc39.es/ecma262/#sec-toprimitive
	toPrimitive$6 = function (input, pref) {
	  if (!isObject(input) || isSymbol(input)) return input;
	  var exoticToPrim = getMethod(input, TO_PRIMITIVE);
	  var result;
	  if (exoticToPrim) {
	    if (pref === undefined) pref = 'default';
	    result = call(exoticToPrim, input, pref);
	    if (!isObject(result) || isSymbol(result)) return result;
	    throw new $TypeError("Can't convert object to primitive value");
	  }
	  if (pref === undefined) pref = 'number';
	  return ordinaryToPrimitive(input, pref);
	};
	return toPrimitive$6;
}

var toPropertyKey$1;
var hasRequiredToPropertyKey;

function requireToPropertyKey () {
	if (hasRequiredToPropertyKey) return toPropertyKey$1;
	hasRequiredToPropertyKey = 1;
	var toPrimitive = /*@__PURE__*/ requireToPrimitive$5();
	var isSymbol = /*@__PURE__*/ requireIsSymbol();

	// `ToPropertyKey` abstract operation
	// https://tc39.es/ecma262/#sec-topropertykey
	toPropertyKey$1 = function (argument) {
	  var key = toPrimitive(argument, 'string');
	  return isSymbol(key) ? key : key + '';
	};
	return toPropertyKey$1;
}

var documentCreateElement;
var hasRequiredDocumentCreateElement;

function requireDocumentCreateElement () {
	if (hasRequiredDocumentCreateElement) return documentCreateElement;
	hasRequiredDocumentCreateElement = 1;
	var globalThis = /*@__PURE__*/ requireGlobalThis();
	var isObject = /*@__PURE__*/ requireIsObject();

	var document = globalThis.document;
	// typeof document.createElement is 'object' in old IE
	var EXISTS = isObject(document) && isObject(document.createElement);

	documentCreateElement = function (it) {
	  return EXISTS ? document.createElement(it) : {};
	};
	return documentCreateElement;
}

var ie8DomDefine;
var hasRequiredIe8DomDefine;

function requireIe8DomDefine () {
	if (hasRequiredIe8DomDefine) return ie8DomDefine;
	hasRequiredIe8DomDefine = 1;
	var DESCRIPTORS = /*@__PURE__*/ requireDescriptors();
	var fails = /*@__PURE__*/ requireFails();
	var createElement = /*@__PURE__*/ requireDocumentCreateElement();

	// Thanks to IE8 for its funny defineProperty
	ie8DomDefine = !DESCRIPTORS && !fails(function () {
	  // eslint-disable-next-line es/no-object-defineproperty -- required for testing
	  return Object.defineProperty(createElement('div'), 'a', {
	    get: function () { return 7; }
	  }).a !== 7;
	});
	return ie8DomDefine;
}

var hasRequiredObjectGetOwnPropertyDescriptor;

function requireObjectGetOwnPropertyDescriptor () {
	if (hasRequiredObjectGetOwnPropertyDescriptor) return objectGetOwnPropertyDescriptor;
	hasRequiredObjectGetOwnPropertyDescriptor = 1;
	var DESCRIPTORS = /*@__PURE__*/ requireDescriptors();
	var call = /*@__PURE__*/ requireFunctionCall();
	var propertyIsEnumerableModule = /*@__PURE__*/ requireObjectPropertyIsEnumerable();
	var createPropertyDescriptor = /*@__PURE__*/ requireCreatePropertyDescriptor();
	var toIndexedObject = /*@__PURE__*/ requireToIndexedObject();
	var toPropertyKey = /*@__PURE__*/ requireToPropertyKey();
	var hasOwn = /*@__PURE__*/ requireHasOwnProperty();
	var IE8_DOM_DEFINE = /*@__PURE__*/ requireIe8DomDefine();

	// eslint-disable-next-line es/no-object-getownpropertydescriptor -- safe
	var $getOwnPropertyDescriptor = Object.getOwnPropertyDescriptor;

	// `Object.getOwnPropertyDescriptor` method
	// https://tc39.es/ecma262/#sec-object.getownpropertydescriptor
	objectGetOwnPropertyDescriptor.f = DESCRIPTORS ? $getOwnPropertyDescriptor : function getOwnPropertyDescriptor(O, P) {
	  O = toIndexedObject(O);
	  P = toPropertyKey(P);
	  if (IE8_DOM_DEFINE) try {
	    return $getOwnPropertyDescriptor(O, P);
	  } catch (error) { /* empty */ }
	  if (hasOwn(O, P)) return createPropertyDescriptor(!call(propertyIsEnumerableModule.f, O, P), O[P]);
	};
	return objectGetOwnPropertyDescriptor;
}

var isForced_1;
var hasRequiredIsForced;

function requireIsForced () {
	if (hasRequiredIsForced) return isForced_1;
	hasRequiredIsForced = 1;
	var fails = /*@__PURE__*/ requireFails();
	var isCallable = /*@__PURE__*/ requireIsCallable();

	var replacement = /#|\.prototype\./;

	var isForced = function (feature, detection) {
	  var value = data[normalize(feature)];
	  return value === POLYFILL ? true
	    : value === NATIVE ? false
	    : isCallable(detection) ? fails(detection)
	    : !!detection;
	};

	var normalize = isForced.normalize = function (string) {
	  return String(string).replace(replacement, '.').toLowerCase();
	};

	var data = isForced.data = {};
	var NATIVE = isForced.NATIVE = 'N';
	var POLYFILL = isForced.POLYFILL = 'P';

	isForced_1 = isForced;
	return isForced_1;
}

var functionBindContext;
var hasRequiredFunctionBindContext;

function requireFunctionBindContext () {
	if (hasRequiredFunctionBindContext) return functionBindContext;
	hasRequiredFunctionBindContext = 1;
	var uncurryThis = /*@__PURE__*/ requireFunctionUncurryThisClause();
	var aCallable = /*@__PURE__*/ requireACallable();
	var NATIVE_BIND = /*@__PURE__*/ requireFunctionBindNative();

	var bind = uncurryThis(uncurryThis.bind);

	// optional / simple context binding
	functionBindContext = function (fn, that) {
	  aCallable(fn);
	  return that === undefined ? fn : NATIVE_BIND ? bind(fn, that) : function (/* ...args */) {
	    return fn.apply(that, arguments);
	  };
	};
	return functionBindContext;
}

var objectDefineProperty = {};

var v8PrototypeDefineBug;
var hasRequiredV8PrototypeDefineBug;

function requireV8PrototypeDefineBug () {
	if (hasRequiredV8PrototypeDefineBug) return v8PrototypeDefineBug;
	hasRequiredV8PrototypeDefineBug = 1;
	var DESCRIPTORS = /*@__PURE__*/ requireDescriptors();
	var fails = /*@__PURE__*/ requireFails();

	// V8 ~ Chrome 36-
	// https://bugs.chromium.org/p/v8/issues/detail?id=3334
	v8PrototypeDefineBug = DESCRIPTORS && fails(function () {
	  // eslint-disable-next-line es/no-object-defineproperty -- required for testing
	  return Object.defineProperty(function () { /* empty */ }, 'prototype', {
	    value: 42,
	    writable: false
	  }).prototype !== 42;
	});
	return v8PrototypeDefineBug;
}

var anObject;
var hasRequiredAnObject;

function requireAnObject () {
	if (hasRequiredAnObject) return anObject;
	hasRequiredAnObject = 1;
	var isObject = /*@__PURE__*/ requireIsObject();

	var $String = String;
	var $TypeError = TypeError;

	// `Assert: Type(argument) is Object`
	anObject = function (argument) {
	  if (isObject(argument)) return argument;
	  throw new $TypeError($String(argument) + ' is not an object');
	};
	return anObject;
}

var hasRequiredObjectDefineProperty;

function requireObjectDefineProperty () {
	if (hasRequiredObjectDefineProperty) return objectDefineProperty;
	hasRequiredObjectDefineProperty = 1;
	var DESCRIPTORS = /*@__PURE__*/ requireDescriptors();
	var IE8_DOM_DEFINE = /*@__PURE__*/ requireIe8DomDefine();
	var V8_PROTOTYPE_DEFINE_BUG = /*@__PURE__*/ requireV8PrototypeDefineBug();
	var anObject = /*@__PURE__*/ requireAnObject();
	var toPropertyKey = /*@__PURE__*/ requireToPropertyKey();

	var $TypeError = TypeError;
	// eslint-disable-next-line es/no-object-defineproperty -- safe
	var $defineProperty = Object.defineProperty;
	// eslint-disable-next-line es/no-object-getownpropertydescriptor -- safe
	var $getOwnPropertyDescriptor = Object.getOwnPropertyDescriptor;
	var ENUMERABLE = 'enumerable';
	var CONFIGURABLE = 'configurable';
	var WRITABLE = 'writable';

	// `Object.defineProperty` method
	// https://tc39.es/ecma262/#sec-object.defineproperty
	objectDefineProperty.f = DESCRIPTORS ? V8_PROTOTYPE_DEFINE_BUG ? function defineProperty(O, P, Attributes) {
	  anObject(O);
	  P = toPropertyKey(P);
	  anObject(Attributes);
	  if (typeof O === 'function' && P === 'prototype' && 'value' in Attributes && WRITABLE in Attributes && !Attributes[WRITABLE]) {
	    var current = $getOwnPropertyDescriptor(O, P);
	    if (current && current[WRITABLE]) {
	      O[P] = Attributes.value;
	      Attributes = {
	        configurable: CONFIGURABLE in Attributes ? Attributes[CONFIGURABLE] : current[CONFIGURABLE],
	        enumerable: ENUMERABLE in Attributes ? Attributes[ENUMERABLE] : current[ENUMERABLE],
	        writable: false
	      };
	    }
	  } return $defineProperty(O, P, Attributes);
	} : $defineProperty : function defineProperty(O, P, Attributes) {
	  anObject(O);
	  P = toPropertyKey(P);
	  anObject(Attributes);
	  if (IE8_DOM_DEFINE) try {
	    return $defineProperty(O, P, Attributes);
	  } catch (error) { /* empty */ }
	  if ('get' in Attributes || 'set' in Attributes) throw new $TypeError('Accessors not supported');
	  if ('value' in Attributes) O[P] = Attributes.value;
	  return O;
	};
	return objectDefineProperty;
}

var createNonEnumerableProperty;
var hasRequiredCreateNonEnumerableProperty;

function requireCreateNonEnumerableProperty () {
	if (hasRequiredCreateNonEnumerableProperty) return createNonEnumerableProperty;
	hasRequiredCreateNonEnumerableProperty = 1;
	var DESCRIPTORS = /*@__PURE__*/ requireDescriptors();
	var definePropertyModule = /*@__PURE__*/ requireObjectDefineProperty();
	var createPropertyDescriptor = /*@__PURE__*/ requireCreatePropertyDescriptor();

	createNonEnumerableProperty = DESCRIPTORS ? function (object, key, value) {
	  return definePropertyModule.f(object, key, createPropertyDescriptor(1, value));
	} : function (object, key, value) {
	  object[key] = value;
	  return object;
	};
	return createNonEnumerableProperty;
}

var _export;
var hasRequired_export;

function require_export () {
	if (hasRequired_export) return _export;
	hasRequired_export = 1;
	var globalThis = /*@__PURE__*/ requireGlobalThis();
	var apply = /*@__PURE__*/ requireFunctionApply();
	var uncurryThis = /*@__PURE__*/ requireFunctionUncurryThisClause();
	var isCallable = /*@__PURE__*/ requireIsCallable();
	var getOwnPropertyDescriptor = /*@__PURE__*/ requireObjectGetOwnPropertyDescriptor().f;
	var isForced = /*@__PURE__*/ requireIsForced();
	var path = /*@__PURE__*/ requirePath();
	var bind = /*@__PURE__*/ requireFunctionBindContext();
	var createNonEnumerableProperty = /*@__PURE__*/ requireCreateNonEnumerableProperty();
	var hasOwn = /*@__PURE__*/ requireHasOwnProperty();

	var wrapConstructor = function (NativeConstructor) {
	  var Wrapper = function (a, b, c) {
	    if (this instanceof Wrapper) {
	      switch (arguments.length) {
	        case 0: return new NativeConstructor();
	        case 1: return new NativeConstructor(a);
	        case 2: return new NativeConstructor(a, b);
	      } return new NativeConstructor(a, b, c);
	    } return apply(NativeConstructor, this, arguments);
	  };
	  Wrapper.prototype = NativeConstructor.prototype;
	  return Wrapper;
	};

	/*
	  options.target         - name of the target object
	  options.global         - target is the global object
	  options.stat           - export as static methods of target
	  options.proto          - export as prototype methods of target
	  options.real           - real prototype method for the `pure` version
	  options.forced         - export even if the native feature is available
	  options.bind           - bind methods to the target, required for the `pure` version
	  options.wrap           - wrap constructors to preventing global pollution, required for the `pure` version
	  options.unsafe         - use the simple assignment of property instead of delete + defineProperty
	  options.sham           - add a flag to not completely full polyfills
	  options.enumerable     - export as enumerable property
	  options.dontCallGetSet - prevent calling a getter on target
	  options.name           - the .name of the function if it does not match the key
	*/
	_export = function (options, source) {
	  var TARGET = options.target;
	  var GLOBAL = options.global;
	  var STATIC = options.stat;
	  var PROTO = options.proto;

	  var nativeSource = GLOBAL ? globalThis : STATIC ? globalThis[TARGET] : globalThis[TARGET] && globalThis[TARGET].prototype;

	  var target = GLOBAL ? path : path[TARGET] || createNonEnumerableProperty(path, TARGET, {})[TARGET];
	  var targetPrototype = target.prototype;

	  var FORCED, USE_NATIVE, VIRTUAL_PROTOTYPE;
	  var key, sourceProperty, targetProperty, nativeProperty, resultProperty, descriptor;

	  for (key in source) {
	    FORCED = isForced(GLOBAL ? key : TARGET + (STATIC ? '.' : '#') + key, options.forced);
	    // contains in native
	    USE_NATIVE = !FORCED && nativeSource && hasOwn(nativeSource, key);

	    targetProperty = target[key];

	    if (USE_NATIVE) if (options.dontCallGetSet) {
	      descriptor = getOwnPropertyDescriptor(nativeSource, key);
	      nativeProperty = descriptor && descriptor.value;
	    } else nativeProperty = nativeSource[key];

	    // export native or implementation
	    sourceProperty = (USE_NATIVE && nativeProperty) ? nativeProperty : source[key];

	    if (!FORCED && !PROTO && typeof targetProperty == typeof sourceProperty) continue;

	    // bind methods to global for calling from export context
	    if (options.bind && USE_NATIVE) resultProperty = bind(sourceProperty, globalThis);
	    // wrap global constructors for prevent changes in this version
	    else if (options.wrap && USE_NATIVE) resultProperty = wrapConstructor(sourceProperty);
	    // make static versions for prototype methods
	    else if (PROTO && isCallable(sourceProperty)) resultProperty = uncurryThis(sourceProperty);
	    // default case
	    else resultProperty = sourceProperty;

	    // add a flag to not completely full polyfills
	    if (options.sham || (sourceProperty && sourceProperty.sham) || (targetProperty && targetProperty.sham)) {
	      createNonEnumerableProperty(resultProperty, 'sham', true);
	    }

	    createNonEnumerableProperty(target, key, resultProperty);

	    if (PROTO) {
	      VIRTUAL_PROTOTYPE = TARGET + 'Prototype';
	      if (!hasOwn(path, VIRTUAL_PROTOTYPE)) {
	        createNonEnumerableProperty(path, VIRTUAL_PROTOTYPE, {});
	      }
	      // export virtual prototype methods
	      createNonEnumerableProperty(path[VIRTUAL_PROTOTYPE], key, sourceProperty);
	      // export real prototype methods
	      if (options.real && targetPrototype && (FORCED || !targetPrototype[key])) {
	        createNonEnumerableProperty(targetPrototype, key, sourceProperty);
	      }
	    }
	  }
	};
	return _export;
}

var isArray$3;
var hasRequiredIsArray$3;

function requireIsArray$3 () {
	if (hasRequiredIsArray$3) return isArray$3;
	hasRequiredIsArray$3 = 1;
	var classof = /*@__PURE__*/ requireClassofRaw();

	// `IsArray` abstract operation
	// https://tc39.es/ecma262/#sec-isarray
	// eslint-disable-next-line es/no-array-isarray -- safe
	isArray$3 = Array.isArray || function isArray(argument) {
	  return classof(argument) === 'Array';
	};
	return isArray$3;
}

var hasRequiredEs_array_isArray;

function requireEs_array_isArray () {
	if (hasRequiredEs_array_isArray) return es_array_isArray;
	hasRequiredEs_array_isArray = 1;
	var $ = /*@__PURE__*/ require_export();
	var isArray = /*@__PURE__*/ requireIsArray$3();

	// `Array.isArray` method
	// https://tc39.es/ecma262/#sec-array.isarray
	$({ target: 'Array', stat: true }, {
	  isArray: isArray
	});
	return es_array_isArray;
}

var isArray$2;
var hasRequiredIsArray$2;

function requireIsArray$2 () {
	if (hasRequiredIsArray$2) return isArray$2;
	hasRequiredIsArray$2 = 1;
	requireEs_array_isArray();
	var path = /*@__PURE__*/ requirePath();

	isArray$2 = path.Array.isArray;
	return isArray$2;
}

var isArray$1;
var hasRequiredIsArray$1;

function requireIsArray$1 () {
	if (hasRequiredIsArray$1) return isArray$1;
	hasRequiredIsArray$1 = 1;
	var parent = /*@__PURE__*/ requireIsArray$2();

	isArray$1 = parent;
	return isArray$1;
}

var isArray;
var hasRequiredIsArray;

function requireIsArray () {
	if (hasRequiredIsArray) return isArray;
	hasRequiredIsArray = 1;
	isArray = /*@__PURE__*/ requireIsArray$1();
	return isArray;
}

var isArrayExports = requireIsArray();
var _Array$isArray = /*@__PURE__*/getDefaultExportFromCjs(isArrayExports);

var es_function_bind = {};

var arraySlice;
var hasRequiredArraySlice;

function requireArraySlice () {
	if (hasRequiredArraySlice) return arraySlice;
	hasRequiredArraySlice = 1;
	var uncurryThis = /*@__PURE__*/ requireFunctionUncurryThis();

	arraySlice = uncurryThis([].slice);
	return arraySlice;
}

var functionBind;
var hasRequiredFunctionBind;

function requireFunctionBind () {
	if (hasRequiredFunctionBind) return functionBind;
	hasRequiredFunctionBind = 1;
	var uncurryThis = /*@__PURE__*/ requireFunctionUncurryThis();
	var aCallable = /*@__PURE__*/ requireACallable();
	var isObject = /*@__PURE__*/ requireIsObject();
	var hasOwn = /*@__PURE__*/ requireHasOwnProperty();
	var arraySlice = /*@__PURE__*/ requireArraySlice();
	var NATIVE_BIND = /*@__PURE__*/ requireFunctionBindNative();

	var $Function = Function;
	var concat = uncurryThis([].concat);
	var join = uncurryThis([].join);
	var factories = {};

	var construct = function (C, argsLength, args) {
	  if (!hasOwn(factories, argsLength)) {
	    var list = [];
	    var i = 0;
	    for (; i < argsLength; i++) list[i] = 'a[' + i + ']';
	    factories[argsLength] = $Function('C,a', 'return new C(' + join(list, ',') + ')');
	  } return factories[argsLength](C, args);
	};

	// `Function.prototype.bind` method implementation
	// https://tc39.es/ecma262/#sec-function.prototype.bind
	// eslint-disable-next-line es/no-function-prototype-bind -- detection
	functionBind = NATIVE_BIND ? $Function.bind : function bind(that /* , ...args */) {
	  var F = aCallable(this);
	  var Prototype = F.prototype;
	  var partArgs = arraySlice(arguments, 1);
	  var boundFunction = function bound(/* args... */) {
	    var args = concat(partArgs, arraySlice(arguments));
	    return this instanceof boundFunction ? construct(F, args.length, args) : F.apply(that, args);
	  };
	  if (isObject(Prototype)) boundFunction.prototype = Prototype;
	  return boundFunction;
	};
	return functionBind;
}

var hasRequiredEs_function_bind;

function requireEs_function_bind () {
	if (hasRequiredEs_function_bind) return es_function_bind;
	hasRequiredEs_function_bind = 1;
	// TODO: Remove from `core-js@4`
	var $ = /*@__PURE__*/ require_export();
	var bind = /*@__PURE__*/ requireFunctionBind();

	// `Function.prototype.bind` method
	// https://tc39.es/ecma262/#sec-function.prototype.bind
	// eslint-disable-next-line es/no-function-prototype-bind -- detection
	$({ target: 'Function', proto: true, forced: Function.bind !== bind }, {
	  bind: bind
	});
	return es_function_bind;
}

var getBuiltInPrototypeMethod;
var hasRequiredGetBuiltInPrototypeMethod;

function requireGetBuiltInPrototypeMethod () {
	if (hasRequiredGetBuiltInPrototypeMethod) return getBuiltInPrototypeMethod;
	hasRequiredGetBuiltInPrototypeMethod = 1;
	var globalThis = /*@__PURE__*/ requireGlobalThis();
	var path = /*@__PURE__*/ requirePath();

	getBuiltInPrototypeMethod = function (CONSTRUCTOR, METHOD) {
	  var Namespace = path[CONSTRUCTOR + 'Prototype'];
	  var pureMethod = Namespace && Namespace[METHOD];
	  if (pureMethod) return pureMethod;
	  var NativeConstructor = globalThis[CONSTRUCTOR];
	  var NativePrototype = NativeConstructor && NativeConstructor.prototype;
	  return NativePrototype && NativePrototype[METHOD];
	};
	return getBuiltInPrototypeMethod;
}

var bind$3;
var hasRequiredBind$3;

function requireBind$3 () {
	if (hasRequiredBind$3) return bind$3;
	hasRequiredBind$3 = 1;
	requireEs_function_bind();
	var getBuiltInPrototypeMethod = /*@__PURE__*/ requireGetBuiltInPrototypeMethod();

	bind$3 = getBuiltInPrototypeMethod('Function', 'bind');
	return bind$3;
}

var bind$2;
var hasRequiredBind$2;

function requireBind$2 () {
	if (hasRequiredBind$2) return bind$2;
	hasRequiredBind$2 = 1;
	var isPrototypeOf = /*@__PURE__*/ requireObjectIsPrototypeOf();
	var method = /*@__PURE__*/ requireBind$3();

	var FunctionPrototype = Function.prototype;

	bind$2 = function (it) {
	  var own = it.bind;
	  return it === FunctionPrototype || (isPrototypeOf(FunctionPrototype, it) && own === FunctionPrototype.bind) ? method : own;
	};
	return bind$2;
}

var bind$1;
var hasRequiredBind$1;

function requireBind$1 () {
	if (hasRequiredBind$1) return bind$1;
	hasRequiredBind$1 = 1;
	var parent = /*@__PURE__*/ requireBind$2();

	bind$1 = parent;
	return bind$1;
}

var bind;
var hasRequiredBind;

function requireBind () {
	if (hasRequiredBind) return bind;
	hasRequiredBind = 1;
	bind = /*@__PURE__*/ requireBind$1();
	return bind;
}

var bindExports = requireBind();
var _bindInstanceProperty = /*@__PURE__*/getDefaultExportFromCjs(bindExports);

var web_timers = {};

var web_setInterval = {};

var environment;
var hasRequiredEnvironment;

function requireEnvironment () {
	if (hasRequiredEnvironment) return environment;
	hasRequiredEnvironment = 1;
	/* global Bun, Deno -- detection */
	var globalThis = /*@__PURE__*/ requireGlobalThis();
	var userAgent = /*@__PURE__*/ requireEnvironmentUserAgent();
	var classof = /*@__PURE__*/ requireClassofRaw();

	var userAgentStartsWith = function (string) {
	  return userAgent.slice(0, string.length) === string;
	};

	environment = (function () {
	  if (userAgentStartsWith('Bun/')) return 'BUN';
	  if (userAgentStartsWith('Cloudflare-Workers')) return 'CLOUDFLARE';
	  if (userAgentStartsWith('Deno/')) return 'DENO';
	  if (userAgentStartsWith('Node.js/')) return 'NODE';
	  if (globalThis.Bun && typeof Bun.version == 'string') return 'BUN';
	  if (globalThis.Deno && typeof Deno.version == 'object') return 'DENO';
	  if (classof(globalThis.process) === 'process') return 'NODE';
	  if (globalThis.window && globalThis.document) return 'BROWSER';
	  return 'REST';
	})();
	return environment;
}

var validateArgumentsLength;
var hasRequiredValidateArgumentsLength;

function requireValidateArgumentsLength () {
	if (hasRequiredValidateArgumentsLength) return validateArgumentsLength;
	hasRequiredValidateArgumentsLength = 1;
	var $TypeError = TypeError;

	validateArgumentsLength = function (passed, required) {
	  if (passed < required) throw new $TypeError('Not enough arguments');
	  return passed;
	};
	return validateArgumentsLength;
}

var schedulersFix;
var hasRequiredSchedulersFix;

function requireSchedulersFix () {
	if (hasRequiredSchedulersFix) return schedulersFix;
	hasRequiredSchedulersFix = 1;
	var globalThis = /*@__PURE__*/ requireGlobalThis();
	var apply = /*@__PURE__*/ requireFunctionApply();
	var isCallable = /*@__PURE__*/ requireIsCallable();
	var ENVIRONMENT = /*@__PURE__*/ requireEnvironment();
	var USER_AGENT = /*@__PURE__*/ requireEnvironmentUserAgent();
	var arraySlice = /*@__PURE__*/ requireArraySlice();
	var validateArgumentsLength = /*@__PURE__*/ requireValidateArgumentsLength();

	var Function = globalThis.Function;
	// dirty IE9- and Bun 0.3.0- checks
	var WRAP = /MSIE .\./.test(USER_AGENT) || ENVIRONMENT === 'BUN' && (function () {
	  var version = globalThis.Bun.version.split('.');
	  return version.length < 3 || version[0] === '0' && (version[1] < 3 || version[1] === '3' && version[2] === '0');
	})();

	// IE9- / Bun 0.3.0- setTimeout / setInterval / setImmediate additional parameters fix
	// https://html.spec.whatwg.org/multipage/timers-and-user-prompts.html#timers
	// https://github.com/oven-sh/bun/issues/1633
	schedulersFix = function (scheduler, hasTimeArg) {
	  var firstParamIndex = hasTimeArg ? 2 : 1;
	  return WRAP ? function (handler, timeout /* , ...arguments */) {
	    var boundArgs = validateArgumentsLength(arguments.length, 1) > firstParamIndex;
	    var fn = isCallable(handler) ? handler : Function(handler);
	    var params = boundArgs ? arraySlice(arguments, firstParamIndex) : [];
	    var callback = boundArgs ? function () {
	      apply(fn, this, params);
	    } : fn;
	    return hasTimeArg ? scheduler(callback, timeout) : scheduler(callback);
	  } : scheduler;
	};
	return schedulersFix;
}

var hasRequiredWeb_setInterval;

function requireWeb_setInterval () {
	if (hasRequiredWeb_setInterval) return web_setInterval;
	hasRequiredWeb_setInterval = 1;
	var $ = /*@__PURE__*/ require_export();
	var globalThis = /*@__PURE__*/ requireGlobalThis();
	var schedulersFix = /*@__PURE__*/ requireSchedulersFix();

	var setInterval = schedulersFix(globalThis.setInterval, true);

	// Bun / IE9- setInterval additional parameters fix
	// https://html.spec.whatwg.org/multipage/timers-and-user-prompts.html#dom-setinterval
	$({ global: true, bind: true, forced: globalThis.setInterval !== setInterval }, {
	  setInterval: setInterval
	});
	return web_setInterval;
}

var web_setTimeout = {};

var hasRequiredWeb_setTimeout;

function requireWeb_setTimeout () {
	if (hasRequiredWeb_setTimeout) return web_setTimeout;
	hasRequiredWeb_setTimeout = 1;
	var $ = /*@__PURE__*/ require_export();
	var globalThis = /*@__PURE__*/ requireGlobalThis();
	var schedulersFix = /*@__PURE__*/ requireSchedulersFix();

	var setTimeout = schedulersFix(globalThis.setTimeout, true);

	// Bun / IE9- setTimeout additional parameters fix
	// https://html.spec.whatwg.org/multipage/timers-and-user-prompts.html#dom-settimeout
	$({ global: true, bind: true, forced: globalThis.setTimeout !== setTimeout }, {
	  setTimeout: setTimeout
	});
	return web_setTimeout;
}

var hasRequiredWeb_timers;

function requireWeb_timers () {
	if (hasRequiredWeb_timers) return web_timers;
	hasRequiredWeb_timers = 1;
	// TODO: Remove this module from `core-js@4` since it's split to modules listed below
	requireWeb_setInterval();
	requireWeb_setTimeout();
	return web_timers;
}

var setTimeout$2;
var hasRequiredSetTimeout$1;

function requireSetTimeout$1 () {
	if (hasRequiredSetTimeout$1) return setTimeout$2;
	hasRequiredSetTimeout$1 = 1;
	requireWeb_timers();
	var path = /*@__PURE__*/ requirePath();

	setTimeout$2 = path.setTimeout;
	return setTimeout$2;
}

var setTimeout$1;
var hasRequiredSetTimeout;

function requireSetTimeout () {
	if (hasRequiredSetTimeout) return setTimeout$1;
	hasRequiredSetTimeout = 1;
	setTimeout$1 = /*@__PURE__*/ requireSetTimeout$1();
	return setTimeout$1;
}

var setTimeoutExports = requireSetTimeout();
var _setTimeout = /*@__PURE__*/getDefaultExportFromCjs(setTimeoutExports);

var toStringTagSupport;
var hasRequiredToStringTagSupport;

function requireToStringTagSupport () {
	if (hasRequiredToStringTagSupport) return toStringTagSupport;
	hasRequiredToStringTagSupport = 1;
	var wellKnownSymbol = /*@__PURE__*/ requireWellKnownSymbol();

	var TO_STRING_TAG = wellKnownSymbol('toStringTag');
	var test = {};

	test[TO_STRING_TAG] = 'z';

	toStringTagSupport = String(test) === '[object z]';
	return toStringTagSupport;
}

var classof;
var hasRequiredClassof;

function requireClassof () {
	if (hasRequiredClassof) return classof;
	hasRequiredClassof = 1;
	var TO_STRING_TAG_SUPPORT = /*@__PURE__*/ requireToStringTagSupport();
	var isCallable = /*@__PURE__*/ requireIsCallable();
	var classofRaw = /*@__PURE__*/ requireClassofRaw();
	var wellKnownSymbol = /*@__PURE__*/ requireWellKnownSymbol();

	var TO_STRING_TAG = wellKnownSymbol('toStringTag');
	var $Object = Object;

	// ES3 wrong here
	var CORRECT_ARGUMENTS = classofRaw(function () { return arguments; }()) === 'Arguments';

	// fallback for IE11 Script Access Denied error
	var tryGet = function (it, key) {
	  try {
	    return it[key];
	  } catch (error) { /* empty */ }
	};

	// getting tag from ES6+ `Object.prototype.toString`
	classof = TO_STRING_TAG_SUPPORT ? classofRaw : function (it) {
	  var O, tag, result;
	  return it === undefined ? 'Undefined' : it === null ? 'Null'
	    // @@toStringTag case
	    : typeof (tag = tryGet(O = $Object(it), TO_STRING_TAG)) == 'string' ? tag
	    // builtinTag case
	    : CORRECT_ARGUMENTS ? classofRaw(O)
	    // ES3 arguments fallback
	    : (result = classofRaw(O)) === 'Object' && isCallable(O.callee) ? 'Arguments' : result;
	};
	return classof;
}

var es_array_forEach = {};

var mathTrunc;
var hasRequiredMathTrunc;

function requireMathTrunc () {
	if (hasRequiredMathTrunc) return mathTrunc;
	hasRequiredMathTrunc = 1;
	var ceil = Math.ceil;
	var floor = Math.floor;

	// `Math.trunc` method
	// https://tc39.es/ecma262/#sec-math.trunc
	// eslint-disable-next-line es/no-math-trunc -- safe
	mathTrunc = Math.trunc || function trunc(x) {
	  var n = +x;
	  return (n > 0 ? floor : ceil)(n);
	};
	return mathTrunc;
}

var toIntegerOrInfinity;
var hasRequiredToIntegerOrInfinity;

function requireToIntegerOrInfinity () {
	if (hasRequiredToIntegerOrInfinity) return toIntegerOrInfinity;
	hasRequiredToIntegerOrInfinity = 1;
	var trunc = /*@__PURE__*/ requireMathTrunc();

	// `ToIntegerOrInfinity` abstract operation
	// https://tc39.es/ecma262/#sec-tointegerorinfinity
	toIntegerOrInfinity = function (argument) {
	  var number = +argument;
	  // eslint-disable-next-line no-self-compare -- NaN check
	  return number !== number || number === 0 ? 0 : trunc(number);
	};
	return toIntegerOrInfinity;
}

var toLength;
var hasRequiredToLength;

function requireToLength () {
	if (hasRequiredToLength) return toLength;
	hasRequiredToLength = 1;
	var toIntegerOrInfinity = /*@__PURE__*/ requireToIntegerOrInfinity();

	var min = Math.min;

	// `ToLength` abstract operation
	// https://tc39.es/ecma262/#sec-tolength
	toLength = function (argument) {
	  var len = toIntegerOrInfinity(argument);
	  return len > 0 ? min(len, 0x1FFFFFFFFFFFFF) : 0; // 2 ** 53 - 1 == 9007199254740991
	};
	return toLength;
}

var lengthOfArrayLike;
var hasRequiredLengthOfArrayLike;

function requireLengthOfArrayLike () {
	if (hasRequiredLengthOfArrayLike) return lengthOfArrayLike;
	hasRequiredLengthOfArrayLike = 1;
	var toLength = /*@__PURE__*/ requireToLength();

	// `LengthOfArrayLike` abstract operation
	// https://tc39.es/ecma262/#sec-lengthofarraylike
	lengthOfArrayLike = function (obj) {
	  return toLength(obj.length);
	};
	return lengthOfArrayLike;
}

var inspectSource;
var hasRequiredInspectSource;

function requireInspectSource () {
	if (hasRequiredInspectSource) return inspectSource;
	hasRequiredInspectSource = 1;
	var uncurryThis = /*@__PURE__*/ requireFunctionUncurryThis();
	var isCallable = /*@__PURE__*/ requireIsCallable();
	var store = /*@__PURE__*/ requireSharedStore();

	var functionToString = uncurryThis(Function.toString);

	// this helper broken in `core-js@3.4.1-3.4.4`, so we can't use `shared` helper
	if (!isCallable(store.inspectSource)) {
	  store.inspectSource = function (it) {
	    return functionToString(it);
	  };
	}

	inspectSource = store.inspectSource;
	return inspectSource;
}

var isConstructor;
var hasRequiredIsConstructor;

function requireIsConstructor () {
	if (hasRequiredIsConstructor) return isConstructor;
	hasRequiredIsConstructor = 1;
	var uncurryThis = /*@__PURE__*/ requireFunctionUncurryThis();
	var fails = /*@__PURE__*/ requireFails();
	var isCallable = /*@__PURE__*/ requireIsCallable();
	var classof = /*@__PURE__*/ requireClassof();
	var getBuiltIn = /*@__PURE__*/ requireGetBuiltIn();
	var inspectSource = /*@__PURE__*/ requireInspectSource();

	var noop = function () { /* empty */ };
	var construct = getBuiltIn('Reflect', 'construct');
	var constructorRegExp = /^\s*(?:class|function)\b/;
	var exec = uncurryThis(constructorRegExp.exec);
	var INCORRECT_TO_STRING = !constructorRegExp.test(noop);

	var isConstructorModern = function isConstructor(argument) {
	  if (!isCallable(argument)) return false;
	  try {
	    construct(noop, [], argument);
	    return true;
	  } catch (error) {
	    return false;
	  }
	};

	var isConstructorLegacy = function isConstructor(argument) {
	  if (!isCallable(argument)) return false;
	  switch (classof(argument)) {
	    case 'AsyncFunction':
	    case 'GeneratorFunction':
	    case 'AsyncGeneratorFunction': return false;
	  }
	  try {
	    // we can't check .prototype since constructors produced by .bind haven't it
	    // `Function#toString` throws on some built-it function in some legacy engines
	    // (for example, `DOMQuad` and similar in FF41-)
	    return INCORRECT_TO_STRING || !!exec(constructorRegExp, inspectSource(argument));
	  } catch (error) {
	    return true;
	  }
	};

	isConstructorLegacy.sham = true;

	// `IsConstructor` abstract operation
	// https://tc39.es/ecma262/#sec-isconstructor
	isConstructor = !construct || fails(function () {
	  var called;
	  return isConstructorModern(isConstructorModern.call)
	    || !isConstructorModern(Object)
	    || !isConstructorModern(function () { called = true; })
	    || called;
	}) ? isConstructorLegacy : isConstructorModern;
	return isConstructor;
}

var arraySpeciesConstructor;
var hasRequiredArraySpeciesConstructor;

function requireArraySpeciesConstructor () {
	if (hasRequiredArraySpeciesConstructor) return arraySpeciesConstructor;
	hasRequiredArraySpeciesConstructor = 1;
	var isArray = /*@__PURE__*/ requireIsArray$3();
	var isConstructor = /*@__PURE__*/ requireIsConstructor();
	var isObject = /*@__PURE__*/ requireIsObject();
	var wellKnownSymbol = /*@__PURE__*/ requireWellKnownSymbol();

	var SPECIES = wellKnownSymbol('species');
	var $Array = Array;

	// a part of `ArraySpeciesCreate` abstract operation
	// https://tc39.es/ecma262/#sec-arrayspeciescreate
	arraySpeciesConstructor = function (originalArray) {
	  var C;
	  if (isArray(originalArray)) {
	    C = originalArray.constructor;
	    // cross-realm fallback
	    if (isConstructor(C) && (C === $Array || isArray(C.prototype))) C = undefined;
	    else if (isObject(C)) {
	      C = C[SPECIES];
	      if (C === null) C = undefined;
	    }
	  } return C === undefined ? $Array : C;
	};
	return arraySpeciesConstructor;
}

var arraySpeciesCreate;
var hasRequiredArraySpeciesCreate;

function requireArraySpeciesCreate () {
	if (hasRequiredArraySpeciesCreate) return arraySpeciesCreate;
	hasRequiredArraySpeciesCreate = 1;
	var arraySpeciesConstructor = /*@__PURE__*/ requireArraySpeciesConstructor();

	// `ArraySpeciesCreate` abstract operation
	// https://tc39.es/ecma262/#sec-arrayspeciescreate
	arraySpeciesCreate = function (originalArray, length) {
	  return new (arraySpeciesConstructor(originalArray))(length === 0 ? 0 : length);
	};
	return arraySpeciesCreate;
}

var arrayIteration;
var hasRequiredArrayIteration;

function requireArrayIteration () {
	if (hasRequiredArrayIteration) return arrayIteration;
	hasRequiredArrayIteration = 1;
	var bind = /*@__PURE__*/ requireFunctionBindContext();
	var uncurryThis = /*@__PURE__*/ requireFunctionUncurryThis();
	var IndexedObject = /*@__PURE__*/ requireIndexedObject();
	var toObject = /*@__PURE__*/ requireToObject();
	var lengthOfArrayLike = /*@__PURE__*/ requireLengthOfArrayLike();
	var arraySpeciesCreate = /*@__PURE__*/ requireArraySpeciesCreate();

	var push = uncurryThis([].push);

	// `Array.prototype.{ forEach, map, filter, some, every, find, findIndex, filterReject }` methods implementation
	var createMethod = function (TYPE) {
	  var IS_MAP = TYPE === 1;
	  var IS_FILTER = TYPE === 2;
	  var IS_SOME = TYPE === 3;
	  var IS_EVERY = TYPE === 4;
	  var IS_FIND_INDEX = TYPE === 6;
	  var IS_FILTER_REJECT = TYPE === 7;
	  var NO_HOLES = TYPE === 5 || IS_FIND_INDEX;
	  return function ($this, callbackfn, that, specificCreate) {
	    var O = toObject($this);
	    var self = IndexedObject(O);
	    var length = lengthOfArrayLike(self);
	    var boundFunction = bind(callbackfn, that);
	    var index = 0;
	    var create = specificCreate || arraySpeciesCreate;
	    var target = IS_MAP ? create($this, length) : IS_FILTER || IS_FILTER_REJECT ? create($this, 0) : undefined;
	    var value, result;
	    for (;length > index; index++) if (NO_HOLES || index in self) {
	      value = self[index];
	      result = boundFunction(value, index, O);
	      if (TYPE) {
	        if (IS_MAP) target[index] = result; // map
	        else if (result) switch (TYPE) {
	          case 3: return true;              // some
	          case 5: return value;             // find
	          case 6: return index;             // findIndex
	          case 2: push(target, value);      // filter
	        } else switch (TYPE) {
	          case 4: return false;             // every
	          case 7: push(target, value);      // filterReject
	        }
	      }
	    }
	    return IS_FIND_INDEX ? -1 : IS_SOME || IS_EVERY ? IS_EVERY : target;
	  };
	};

	arrayIteration = {
	  // `Array.prototype.forEach` method
	  // https://tc39.es/ecma262/#sec-array.prototype.foreach
	  forEach: createMethod(0),
	  // `Array.prototype.map` method
	  // https://tc39.es/ecma262/#sec-array.prototype.map
	  map: createMethod(1),
	  // `Array.prototype.filter` method
	  // https://tc39.es/ecma262/#sec-array.prototype.filter
	  filter: createMethod(2),
	  // `Array.prototype.some` method
	  // https://tc39.es/ecma262/#sec-array.prototype.some
	  some: createMethod(3),
	  // `Array.prototype.every` method
	  // https://tc39.es/ecma262/#sec-array.prototype.every
	  every: createMethod(4),
	  // `Array.prototype.find` method
	  // https://tc39.es/ecma262/#sec-array.prototype.find
	  find: createMethod(5),
	  // `Array.prototype.findIndex` method
	  // https://tc39.es/ecma262/#sec-array.prototype.findIndex
	  findIndex: createMethod(6),
	  // `Array.prototype.filterReject` method
	  // https://github.com/tc39/proposal-array-filtering
	  filterReject: createMethod(7)
	};
	return arrayIteration;
}

var arrayMethodIsStrict;
var hasRequiredArrayMethodIsStrict;

function requireArrayMethodIsStrict () {
	if (hasRequiredArrayMethodIsStrict) return arrayMethodIsStrict;
	hasRequiredArrayMethodIsStrict = 1;
	var fails = /*@__PURE__*/ requireFails();

	arrayMethodIsStrict = function (METHOD_NAME, argument) {
	  var method = [][METHOD_NAME];
	  return !!method && fails(function () {
	    // eslint-disable-next-line no-useless-call -- required for testing
	    method.call(null, argument || function () { return 1; }, 1);
	  });
	};
	return arrayMethodIsStrict;
}

var arrayForEach;
var hasRequiredArrayForEach;

function requireArrayForEach () {
	if (hasRequiredArrayForEach) return arrayForEach;
	hasRequiredArrayForEach = 1;
	var $forEach = /*@__PURE__*/ requireArrayIteration().forEach;
	var arrayMethodIsStrict = /*@__PURE__*/ requireArrayMethodIsStrict();

	var STRICT_METHOD = arrayMethodIsStrict('forEach');

	// `Array.prototype.forEach` method implementation
	// https://tc39.es/ecma262/#sec-array.prototype.foreach
	arrayForEach = !STRICT_METHOD ? function forEach(callbackfn /* , thisArg */) {
	  return $forEach(this, callbackfn, arguments.length > 1 ? arguments[1] : undefined);
	// eslint-disable-next-line es/no-array-prototype-foreach -- safe
	} : [].forEach;
	return arrayForEach;
}

var hasRequiredEs_array_forEach;

function requireEs_array_forEach () {
	if (hasRequiredEs_array_forEach) return es_array_forEach;
	hasRequiredEs_array_forEach = 1;
	var $ = /*@__PURE__*/ require_export();
	var forEach = /*@__PURE__*/ requireArrayForEach();

	// `Array.prototype.forEach` method
	// https://tc39.es/ecma262/#sec-array.prototype.foreach
	// eslint-disable-next-line es/no-array-prototype-foreach -- safe
	$({ target: 'Array', proto: true, forced: [].forEach !== forEach }, {
	  forEach: forEach
	});
	return es_array_forEach;
}

var forEach$4;
var hasRequiredForEach$3;

function requireForEach$3 () {
	if (hasRequiredForEach$3) return forEach$4;
	hasRequiredForEach$3 = 1;
	requireEs_array_forEach();
	var getBuiltInPrototypeMethod = /*@__PURE__*/ requireGetBuiltInPrototypeMethod();

	forEach$4 = getBuiltInPrototypeMethod('Array', 'forEach');
	return forEach$4;
}

var forEach$3;
var hasRequiredForEach$2;

function requireForEach$2 () {
	if (hasRequiredForEach$2) return forEach$3;
	hasRequiredForEach$2 = 1;
	var parent = /*@__PURE__*/ requireForEach$3();

	forEach$3 = parent;
	return forEach$3;
}

var forEach$2;
var hasRequiredForEach$1;

function requireForEach$1 () {
	if (hasRequiredForEach$1) return forEach$2;
	hasRequiredForEach$1 = 1;
	var classof = /*@__PURE__*/ requireClassof();
	var hasOwn = /*@__PURE__*/ requireHasOwnProperty();
	var isPrototypeOf = /*@__PURE__*/ requireObjectIsPrototypeOf();
	var method = /*@__PURE__*/ requireForEach$2();

	var ArrayPrototype = Array.prototype;

	var DOMIterables = {
	  DOMTokenList: true,
	  NodeList: true
	};

	forEach$2 = function (it) {
	  var own = it.forEach;
	  return it === ArrayPrototype || (isPrototypeOf(ArrayPrototype, it) && own === ArrayPrototype.forEach)
	    || hasOwn(DOMIterables, classof(it)) ? method : own;
	};
	return forEach$2;
}

var forEach$1;
var hasRequiredForEach;

function requireForEach () {
	if (hasRequiredForEach) return forEach$1;
	hasRequiredForEach = 1;
	forEach$1 = /*@__PURE__*/ requireForEach$1();
	return forEach$1;
}

var forEachExports = requireForEach();
var _forEachInstanceProperty = /*@__PURE__*/getDefaultExportFromCjs(forEachExports);

// Check if Moment.js is already loaded in the browser window, if so, use this
// instance, else use bundled Moment.js.
const moment$2 = typeof window !== "undefined" && window["moment"] || moment$3;

var es_symbol = {};

var es_symbol_constructor = {};

var toString;
var hasRequiredToString;

function requireToString () {
	if (hasRequiredToString) return toString;
	hasRequiredToString = 1;
	var classof = /*@__PURE__*/ requireClassof();

	var $String = String;

	toString = function (argument) {
	  if (classof(argument) === 'Symbol') throw new TypeError('Cannot convert a Symbol value to a string');
	  return $String(argument);
	};
	return toString;
}

var objectDefineProperties = {};

var toAbsoluteIndex;
var hasRequiredToAbsoluteIndex;

function requireToAbsoluteIndex () {
	if (hasRequiredToAbsoluteIndex) return toAbsoluteIndex;
	hasRequiredToAbsoluteIndex = 1;
	var toIntegerOrInfinity = /*@__PURE__*/ requireToIntegerOrInfinity();

	var max = Math.max;
	var min = Math.min;

	// Helper for a popular repeating case of the spec:
	// Let integer be ? ToInteger(index).
	// If integer < 0, let result be max((length + integer), 0); else let result be min(integer, length).
	toAbsoluteIndex = function (index, length) {
	  var integer = toIntegerOrInfinity(index);
	  return integer < 0 ? max(integer + length, 0) : min(integer, length);
	};
	return toAbsoluteIndex;
}

var arrayIncludes;
var hasRequiredArrayIncludes;

function requireArrayIncludes () {
	if (hasRequiredArrayIncludes) return arrayIncludes;
	hasRequiredArrayIncludes = 1;
	var toIndexedObject = /*@__PURE__*/ requireToIndexedObject();
	var toAbsoluteIndex = /*@__PURE__*/ requireToAbsoluteIndex();
	var lengthOfArrayLike = /*@__PURE__*/ requireLengthOfArrayLike();

	// `Array.prototype.{ indexOf, includes }` methods implementation
	var createMethod = function (IS_INCLUDES) {
	  return function ($this, el, fromIndex) {
	    var O = toIndexedObject($this);
	    var length = lengthOfArrayLike(O);
	    if (length === 0) return !IS_INCLUDES && -1;
	    var index = toAbsoluteIndex(fromIndex, length);
	    var value;
	    // Array#includes uses SameValueZero equality algorithm
	    // eslint-disable-next-line no-self-compare -- NaN check
	    if (IS_INCLUDES && el !== el) while (length > index) {
	      value = O[index++];
	      // eslint-disable-next-line no-self-compare -- NaN check
	      if (value !== value) return true;
	    // Array#indexOf ignores holes, Array#includes - not
	    } else for (;length > index; index++) {
	      if ((IS_INCLUDES || index in O) && O[index] === el) return IS_INCLUDES || index || 0;
	    } return !IS_INCLUDES && -1;
	  };
	};

	arrayIncludes = {
	  // `Array.prototype.includes` method
	  // https://tc39.es/ecma262/#sec-array.prototype.includes
	  includes: createMethod(true),
	  // `Array.prototype.indexOf` method
	  // https://tc39.es/ecma262/#sec-array.prototype.indexof
	  indexOf: createMethod(false)
	};
	return arrayIncludes;
}

var hiddenKeys;
var hasRequiredHiddenKeys;

function requireHiddenKeys () {
	if (hasRequiredHiddenKeys) return hiddenKeys;
	hasRequiredHiddenKeys = 1;
	hiddenKeys = {};
	return hiddenKeys;
}

var objectKeysInternal;
var hasRequiredObjectKeysInternal;

function requireObjectKeysInternal () {
	if (hasRequiredObjectKeysInternal) return objectKeysInternal;
	hasRequiredObjectKeysInternal = 1;
	var uncurryThis = /*@__PURE__*/ requireFunctionUncurryThis();
	var hasOwn = /*@__PURE__*/ requireHasOwnProperty();
	var toIndexedObject = /*@__PURE__*/ requireToIndexedObject();
	var indexOf = /*@__PURE__*/ requireArrayIncludes().indexOf;
	var hiddenKeys = /*@__PURE__*/ requireHiddenKeys();

	var push = uncurryThis([].push);

	objectKeysInternal = function (object, names) {
	  var O = toIndexedObject(object);
	  var i = 0;
	  var result = [];
	  var key;
	  for (key in O) !hasOwn(hiddenKeys, key) && hasOwn(O, key) && push(result, key);
	  // Don't enum bug & hidden keys
	  while (names.length > i) if (hasOwn(O, key = names[i++])) {
	    ~indexOf(result, key) || push(result, key);
	  }
	  return result;
	};
	return objectKeysInternal;
}

var enumBugKeys;
var hasRequiredEnumBugKeys;

function requireEnumBugKeys () {
	if (hasRequiredEnumBugKeys) return enumBugKeys;
	hasRequiredEnumBugKeys = 1;
	// IE8- don't enum bug keys
	enumBugKeys = [
	  'constructor',
	  'hasOwnProperty',
	  'isPrototypeOf',
	  'propertyIsEnumerable',
	  'toLocaleString',
	  'toString',
	  'valueOf'
	];
	return enumBugKeys;
}

var objectKeys;
var hasRequiredObjectKeys;

function requireObjectKeys () {
	if (hasRequiredObjectKeys) return objectKeys;
	hasRequiredObjectKeys = 1;
	var internalObjectKeys = /*@__PURE__*/ requireObjectKeysInternal();
	var enumBugKeys = /*@__PURE__*/ requireEnumBugKeys();

	// `Object.keys` method
	// https://tc39.es/ecma262/#sec-object.keys
	// eslint-disable-next-line es/no-object-keys -- safe
	objectKeys = Object.keys || function keys(O) {
	  return internalObjectKeys(O, enumBugKeys);
	};
	return objectKeys;
}

var hasRequiredObjectDefineProperties;

function requireObjectDefineProperties () {
	if (hasRequiredObjectDefineProperties) return objectDefineProperties;
	hasRequiredObjectDefineProperties = 1;
	var DESCRIPTORS = /*@__PURE__*/ requireDescriptors();
	var V8_PROTOTYPE_DEFINE_BUG = /*@__PURE__*/ requireV8PrototypeDefineBug();
	var definePropertyModule = /*@__PURE__*/ requireObjectDefineProperty();
	var anObject = /*@__PURE__*/ requireAnObject();
	var toIndexedObject = /*@__PURE__*/ requireToIndexedObject();
	var objectKeys = /*@__PURE__*/ requireObjectKeys();

	// `Object.defineProperties` method
	// https://tc39.es/ecma262/#sec-object.defineproperties
	// eslint-disable-next-line es/no-object-defineproperties -- safe
	objectDefineProperties.f = DESCRIPTORS && !V8_PROTOTYPE_DEFINE_BUG ? Object.defineProperties : function defineProperties(O, Properties) {
	  anObject(O);
	  var props = toIndexedObject(Properties);
	  var keys = objectKeys(Properties);
	  var length = keys.length;
	  var index = 0;
	  var key;
	  while (length > index) definePropertyModule.f(O, key = keys[index++], props[key]);
	  return O;
	};
	return objectDefineProperties;
}

var html;
var hasRequiredHtml;

function requireHtml () {
	if (hasRequiredHtml) return html;
	hasRequiredHtml = 1;
	var getBuiltIn = /*@__PURE__*/ requireGetBuiltIn();

	html = getBuiltIn('document', 'documentElement');
	return html;
}

var sharedKey;
var hasRequiredSharedKey;

function requireSharedKey () {
	if (hasRequiredSharedKey) return sharedKey;
	hasRequiredSharedKey = 1;
	var shared = /*@__PURE__*/ requireShared();
	var uid = /*@__PURE__*/ requireUid();

	var keys = shared('keys');

	sharedKey = function (key) {
	  return keys[key] || (keys[key] = uid(key));
	};
	return sharedKey;
}

var objectCreate;
var hasRequiredObjectCreate;

function requireObjectCreate () {
	if (hasRequiredObjectCreate) return objectCreate;
	hasRequiredObjectCreate = 1;
	/* global ActiveXObject -- old IE, WSH */
	var anObject = /*@__PURE__*/ requireAnObject();
	var definePropertiesModule = /*@__PURE__*/ requireObjectDefineProperties();
	var enumBugKeys = /*@__PURE__*/ requireEnumBugKeys();
	var hiddenKeys = /*@__PURE__*/ requireHiddenKeys();
	var html = /*@__PURE__*/ requireHtml();
	var documentCreateElement = /*@__PURE__*/ requireDocumentCreateElement();
	var sharedKey = /*@__PURE__*/ requireSharedKey();

	var GT = '>';
	var LT = '<';
	var PROTOTYPE = 'prototype';
	var SCRIPT = 'script';
	var IE_PROTO = sharedKey('IE_PROTO');

	var EmptyConstructor = function () { /* empty */ };

	var scriptTag = function (content) {
	  return LT + SCRIPT + GT + content + LT + '/' + SCRIPT + GT;
	};

	// Create object with fake `null` prototype: use ActiveX Object with cleared prototype
	var NullProtoObjectViaActiveX = function (activeXDocument) {
	  activeXDocument.write(scriptTag(''));
	  activeXDocument.close();
	  var temp = activeXDocument.parentWindow.Object;
	  // eslint-disable-next-line no-useless-assignment -- avoid memory leak
	  activeXDocument = null;
	  return temp;
	};

	// Create object with fake `null` prototype: use iframe Object with cleared prototype
	var NullProtoObjectViaIFrame = function () {
	  // Thrash, waste and sodomy: IE GC bug
	  var iframe = documentCreateElement('iframe');
	  var JS = 'java' + SCRIPT + ':';
	  var iframeDocument;
	  iframe.style.display = 'none';
	  html.appendChild(iframe);
	  // https://github.com/zloirock/core-js/issues/475
	  iframe.src = String(JS);
	  iframeDocument = iframe.contentWindow.document;
	  iframeDocument.open();
	  iframeDocument.write(scriptTag('document.F=Object'));
	  iframeDocument.close();
	  return iframeDocument.F;
	};

	// Check for document.domain and active x support
	// No need to use active x approach when document.domain is not set
	// see https://github.com/es-shims/es5-shim/issues/150
	// variation of https://github.com/kitcambridge/es5-shim/commit/4f738ac066346
	// avoid IE GC bug
	var activeXDocument;
	var NullProtoObject = function () {
	  try {
	    activeXDocument = new ActiveXObject('htmlfile');
	  } catch (error) { /* ignore */ }
	  NullProtoObject = typeof document != 'undefined'
	    ? document.domain && activeXDocument
	      ? NullProtoObjectViaActiveX(activeXDocument) // old IE
	      : NullProtoObjectViaIFrame()
	    : NullProtoObjectViaActiveX(activeXDocument); // WSH
	  var length = enumBugKeys.length;
	  while (length--) delete NullProtoObject[PROTOTYPE][enumBugKeys[length]];
	  return NullProtoObject();
	};

	hiddenKeys[IE_PROTO] = true;

	// `Object.create` method
	// https://tc39.es/ecma262/#sec-object.create
	// eslint-disable-next-line es/no-object-create -- safe
	objectCreate = Object.create || function create(O, Properties) {
	  var result;
	  if (O !== null) {
	    EmptyConstructor[PROTOTYPE] = anObject(O);
	    result = new EmptyConstructor();
	    EmptyConstructor[PROTOTYPE] = null;
	    // add "__proto__" for Object.getPrototypeOf polyfill
	    result[IE_PROTO] = O;
	  } else result = NullProtoObject();
	  return Properties === undefined ? result : definePropertiesModule.f(result, Properties);
	};
	return objectCreate;
}

var objectGetOwnPropertyNames = {};

var hasRequiredObjectGetOwnPropertyNames;

function requireObjectGetOwnPropertyNames () {
	if (hasRequiredObjectGetOwnPropertyNames) return objectGetOwnPropertyNames;
	hasRequiredObjectGetOwnPropertyNames = 1;
	var internalObjectKeys = /*@__PURE__*/ requireObjectKeysInternal();
	var enumBugKeys = /*@__PURE__*/ requireEnumBugKeys();

	var hiddenKeys = enumBugKeys.concat('length', 'prototype');

	// `Object.getOwnPropertyNames` method
	// https://tc39.es/ecma262/#sec-object.getownpropertynames
	// eslint-disable-next-line es/no-object-getownpropertynames -- safe
	objectGetOwnPropertyNames.f = Object.getOwnPropertyNames || function getOwnPropertyNames(O) {
	  return internalObjectKeys(O, hiddenKeys);
	};
	return objectGetOwnPropertyNames;
}

var objectGetOwnPropertyNamesExternal = {};

var hasRequiredObjectGetOwnPropertyNamesExternal;

function requireObjectGetOwnPropertyNamesExternal () {
	if (hasRequiredObjectGetOwnPropertyNamesExternal) return objectGetOwnPropertyNamesExternal;
	hasRequiredObjectGetOwnPropertyNamesExternal = 1;
	/* eslint-disable es/no-object-getownpropertynames -- safe */
	var classof = /*@__PURE__*/ requireClassofRaw();
	var toIndexedObject = /*@__PURE__*/ requireToIndexedObject();
	var $getOwnPropertyNames = /*@__PURE__*/ requireObjectGetOwnPropertyNames().f;
	var arraySlice = /*@__PURE__*/ requireArraySlice();

	var windowNames = typeof window == 'object' && window && Object.getOwnPropertyNames
	  ? Object.getOwnPropertyNames(window) : [];

	var getWindowNames = function (it) {
	  try {
	    return $getOwnPropertyNames(it);
	  } catch (error) {
	    return arraySlice(windowNames);
	  }
	};

	// fallback for IE11 buggy Object.getOwnPropertyNames with iframe and window
	objectGetOwnPropertyNamesExternal.f = function getOwnPropertyNames(it) {
	  return windowNames && classof(it) === 'Window'
	    ? getWindowNames(it)
	    : $getOwnPropertyNames(toIndexedObject(it));
	};
	return objectGetOwnPropertyNamesExternal;
}

var objectGetOwnPropertySymbols = {};

var hasRequiredObjectGetOwnPropertySymbols;

function requireObjectGetOwnPropertySymbols () {
	if (hasRequiredObjectGetOwnPropertySymbols) return objectGetOwnPropertySymbols;
	hasRequiredObjectGetOwnPropertySymbols = 1;
	// eslint-disable-next-line es/no-object-getownpropertysymbols -- safe
	objectGetOwnPropertySymbols.f = Object.getOwnPropertySymbols;
	return objectGetOwnPropertySymbols;
}

var defineBuiltIn;
var hasRequiredDefineBuiltIn;

function requireDefineBuiltIn () {
	if (hasRequiredDefineBuiltIn) return defineBuiltIn;
	hasRequiredDefineBuiltIn = 1;
	var createNonEnumerableProperty = /*@__PURE__*/ requireCreateNonEnumerableProperty();

	defineBuiltIn = function (target, key, value, options) {
	  if (options && options.enumerable) target[key] = value;
	  else createNonEnumerableProperty(target, key, value);
	  return target;
	};
	return defineBuiltIn;
}

var defineBuiltInAccessor;
var hasRequiredDefineBuiltInAccessor;

function requireDefineBuiltInAccessor () {
	if (hasRequiredDefineBuiltInAccessor) return defineBuiltInAccessor;
	hasRequiredDefineBuiltInAccessor = 1;
	var defineProperty = /*@__PURE__*/ requireObjectDefineProperty();

	defineBuiltInAccessor = function (target, name, descriptor) {
	  return defineProperty.f(target, name, descriptor);
	};
	return defineBuiltInAccessor;
}

var wellKnownSymbolWrapped = {};

var hasRequiredWellKnownSymbolWrapped;

function requireWellKnownSymbolWrapped () {
	if (hasRequiredWellKnownSymbolWrapped) return wellKnownSymbolWrapped;
	hasRequiredWellKnownSymbolWrapped = 1;
	var wellKnownSymbol = /*@__PURE__*/ requireWellKnownSymbol();

	wellKnownSymbolWrapped.f = wellKnownSymbol;
	return wellKnownSymbolWrapped;
}

var wellKnownSymbolDefine;
var hasRequiredWellKnownSymbolDefine;

function requireWellKnownSymbolDefine () {
	if (hasRequiredWellKnownSymbolDefine) return wellKnownSymbolDefine;
	hasRequiredWellKnownSymbolDefine = 1;
	var path = /*@__PURE__*/ requirePath();
	var hasOwn = /*@__PURE__*/ requireHasOwnProperty();
	var wrappedWellKnownSymbolModule = /*@__PURE__*/ requireWellKnownSymbolWrapped();
	var defineProperty = /*@__PURE__*/ requireObjectDefineProperty().f;

	wellKnownSymbolDefine = function (NAME) {
	  var Symbol = path.Symbol || (path.Symbol = {});
	  if (!hasOwn(Symbol, NAME)) defineProperty(Symbol, NAME, {
	    value: wrappedWellKnownSymbolModule.f(NAME)
	  });
	};
	return wellKnownSymbolDefine;
}

var symbolDefineToPrimitive;
var hasRequiredSymbolDefineToPrimitive;

function requireSymbolDefineToPrimitive () {
	if (hasRequiredSymbolDefineToPrimitive) return symbolDefineToPrimitive;
	hasRequiredSymbolDefineToPrimitive = 1;
	var call = /*@__PURE__*/ requireFunctionCall();
	var getBuiltIn = /*@__PURE__*/ requireGetBuiltIn();
	var wellKnownSymbol = /*@__PURE__*/ requireWellKnownSymbol();
	var defineBuiltIn = /*@__PURE__*/ requireDefineBuiltIn();

	symbolDefineToPrimitive = function () {
	  var Symbol = getBuiltIn('Symbol');
	  var SymbolPrototype = Symbol && Symbol.prototype;
	  var valueOf = SymbolPrototype && SymbolPrototype.valueOf;
	  var TO_PRIMITIVE = wellKnownSymbol('toPrimitive');

	  if (SymbolPrototype && !SymbolPrototype[TO_PRIMITIVE]) {
	    // `Symbol.prototype[@@toPrimitive]` method
	    // https://tc39.es/ecma262/#sec-symbol.prototype-@@toprimitive
	    // eslint-disable-next-line no-unused-vars -- required for .length
	    defineBuiltIn(SymbolPrototype, TO_PRIMITIVE, function (hint) {
	      return call(valueOf, this);
	    }, { arity: 1 });
	  }
	};
	return symbolDefineToPrimitive;
}

var objectToString;
var hasRequiredObjectToString;

function requireObjectToString () {
	if (hasRequiredObjectToString) return objectToString;
	hasRequiredObjectToString = 1;
	var TO_STRING_TAG_SUPPORT = /*@__PURE__*/ requireToStringTagSupport();
	var classof = /*@__PURE__*/ requireClassof();

	// `Object.prototype.toString` method implementation
	// https://tc39.es/ecma262/#sec-object.prototype.tostring
	objectToString = TO_STRING_TAG_SUPPORT ? {}.toString : function toString() {
	  return '[object ' + classof(this) + ']';
	};
	return objectToString;
}

var setToStringTag;
var hasRequiredSetToStringTag;

function requireSetToStringTag () {
	if (hasRequiredSetToStringTag) return setToStringTag;
	hasRequiredSetToStringTag = 1;
	var TO_STRING_TAG_SUPPORT = /*@__PURE__*/ requireToStringTagSupport();
	var defineProperty = /*@__PURE__*/ requireObjectDefineProperty().f;
	var createNonEnumerableProperty = /*@__PURE__*/ requireCreateNonEnumerableProperty();
	var hasOwn = /*@__PURE__*/ requireHasOwnProperty();
	var toString = /*@__PURE__*/ requireObjectToString();
	var wellKnownSymbol = /*@__PURE__*/ requireWellKnownSymbol();

	var TO_STRING_TAG = wellKnownSymbol('toStringTag');

	setToStringTag = function (it, TAG, STATIC, SET_METHOD) {
	  var target = STATIC ? it : it && it.prototype;
	  if (target) {
	    if (!hasOwn(target, TO_STRING_TAG)) {
	      defineProperty(target, TO_STRING_TAG, { configurable: true, value: TAG });
	    }
	    if (SET_METHOD && !TO_STRING_TAG_SUPPORT) {
	      createNonEnumerableProperty(target, 'toString', toString);
	    }
	  }
	};
	return setToStringTag;
}

var weakMapBasicDetection;
var hasRequiredWeakMapBasicDetection;

function requireWeakMapBasicDetection () {
	if (hasRequiredWeakMapBasicDetection) return weakMapBasicDetection;
	hasRequiredWeakMapBasicDetection = 1;
	var globalThis = /*@__PURE__*/ requireGlobalThis();
	var isCallable = /*@__PURE__*/ requireIsCallable();

	var WeakMap = globalThis.WeakMap;

	weakMapBasicDetection = isCallable(WeakMap) && /native code/.test(String(WeakMap));
	return weakMapBasicDetection;
}

var internalState;
var hasRequiredInternalState;

function requireInternalState () {
	if (hasRequiredInternalState) return internalState;
	hasRequiredInternalState = 1;
	var NATIVE_WEAK_MAP = /*@__PURE__*/ requireWeakMapBasicDetection();
	var globalThis = /*@__PURE__*/ requireGlobalThis();
	var isObject = /*@__PURE__*/ requireIsObject();
	var createNonEnumerableProperty = /*@__PURE__*/ requireCreateNonEnumerableProperty();
	var hasOwn = /*@__PURE__*/ requireHasOwnProperty();
	var shared = /*@__PURE__*/ requireSharedStore();
	var sharedKey = /*@__PURE__*/ requireSharedKey();
	var hiddenKeys = /*@__PURE__*/ requireHiddenKeys();

	var OBJECT_ALREADY_INITIALIZED = 'Object already initialized';
	var TypeError = globalThis.TypeError;
	var WeakMap = globalThis.WeakMap;
	var set, get, has;

	var enforce = function (it) {
	  return has(it) ? get(it) : set(it, {});
	};

	var getterFor = function (TYPE) {
	  return function (it) {
	    var state;
	    if (!isObject(it) || (state = get(it)).type !== TYPE) {
	      throw new TypeError('Incompatible receiver, ' + TYPE + ' required');
	    } return state;
	  };
	};

	if (NATIVE_WEAK_MAP || shared.state) {
	  var store = shared.state || (shared.state = new WeakMap());
	  /* eslint-disable no-self-assign -- prototype methods protection */
	  store.get = store.get;
	  store.has = store.has;
	  store.set = store.set;
	  /* eslint-enable no-self-assign -- prototype methods protection */
	  set = function (it, metadata) {
	    if (store.has(it)) throw new TypeError(OBJECT_ALREADY_INITIALIZED);
	    metadata.facade = it;
	    store.set(it, metadata);
	    return metadata;
	  };
	  get = function (it) {
	    return store.get(it) || {};
	  };
	  has = function (it) {
	    return store.has(it);
	  };
	} else {
	  var STATE = sharedKey('state');
	  hiddenKeys[STATE] = true;
	  set = function (it, metadata) {
	    if (hasOwn(it, STATE)) throw new TypeError(OBJECT_ALREADY_INITIALIZED);
	    metadata.facade = it;
	    createNonEnumerableProperty(it, STATE, metadata);
	    return metadata;
	  };
	  get = function (it) {
	    return hasOwn(it, STATE) ? it[STATE] : {};
	  };
	  has = function (it) {
	    return hasOwn(it, STATE);
	  };
	}

	internalState = {
	  set: set,
	  get: get,
	  has: has,
	  enforce: enforce,
	  getterFor: getterFor
	};
	return internalState;
}

var hasRequiredEs_symbol_constructor;

function requireEs_symbol_constructor () {
	if (hasRequiredEs_symbol_constructor) return es_symbol_constructor;
	hasRequiredEs_symbol_constructor = 1;
	var $ = /*@__PURE__*/ require_export();
	var globalThis = /*@__PURE__*/ requireGlobalThis();
	var call = /*@__PURE__*/ requireFunctionCall();
	var uncurryThis = /*@__PURE__*/ requireFunctionUncurryThis();
	var IS_PURE = /*@__PURE__*/ requireIsPure();
	var DESCRIPTORS = /*@__PURE__*/ requireDescriptors();
	var NATIVE_SYMBOL = /*@__PURE__*/ requireSymbolConstructorDetection();
	var fails = /*@__PURE__*/ requireFails();
	var hasOwn = /*@__PURE__*/ requireHasOwnProperty();
	var isPrototypeOf = /*@__PURE__*/ requireObjectIsPrototypeOf();
	var anObject = /*@__PURE__*/ requireAnObject();
	var toIndexedObject = /*@__PURE__*/ requireToIndexedObject();
	var toPropertyKey = /*@__PURE__*/ requireToPropertyKey();
	var $toString = /*@__PURE__*/ requireToString();
	var createPropertyDescriptor = /*@__PURE__*/ requireCreatePropertyDescriptor();
	var nativeObjectCreate = /*@__PURE__*/ requireObjectCreate();
	var objectKeys = /*@__PURE__*/ requireObjectKeys();
	var getOwnPropertyNamesModule = /*@__PURE__*/ requireObjectGetOwnPropertyNames();
	var getOwnPropertyNamesExternal = /*@__PURE__*/ requireObjectGetOwnPropertyNamesExternal();
	var getOwnPropertySymbolsModule = /*@__PURE__*/ requireObjectGetOwnPropertySymbols();
	var getOwnPropertyDescriptorModule = /*@__PURE__*/ requireObjectGetOwnPropertyDescriptor();
	var definePropertyModule = /*@__PURE__*/ requireObjectDefineProperty();
	var definePropertiesModule = /*@__PURE__*/ requireObjectDefineProperties();
	var propertyIsEnumerableModule = /*@__PURE__*/ requireObjectPropertyIsEnumerable();
	var defineBuiltIn = /*@__PURE__*/ requireDefineBuiltIn();
	var defineBuiltInAccessor = /*@__PURE__*/ requireDefineBuiltInAccessor();
	var shared = /*@__PURE__*/ requireShared();
	var sharedKey = /*@__PURE__*/ requireSharedKey();
	var hiddenKeys = /*@__PURE__*/ requireHiddenKeys();
	var uid = /*@__PURE__*/ requireUid();
	var wellKnownSymbol = /*@__PURE__*/ requireWellKnownSymbol();
	var wrappedWellKnownSymbolModule = /*@__PURE__*/ requireWellKnownSymbolWrapped();
	var defineWellKnownSymbol = /*@__PURE__*/ requireWellKnownSymbolDefine();
	var defineSymbolToPrimitive = /*@__PURE__*/ requireSymbolDefineToPrimitive();
	var setToStringTag = /*@__PURE__*/ requireSetToStringTag();
	var InternalStateModule = /*@__PURE__*/ requireInternalState();
	var $forEach = /*@__PURE__*/ requireArrayIteration().forEach;

	var HIDDEN = sharedKey('hidden');
	var SYMBOL = 'Symbol';
	var PROTOTYPE = 'prototype';

	var setInternalState = InternalStateModule.set;
	var getInternalState = InternalStateModule.getterFor(SYMBOL);

	var ObjectPrototype = Object[PROTOTYPE];
	var $Symbol = globalThis.Symbol;
	var SymbolPrototype = $Symbol && $Symbol[PROTOTYPE];
	var RangeError = globalThis.RangeError;
	var TypeError = globalThis.TypeError;
	var QObject = globalThis.QObject;
	var nativeGetOwnPropertyDescriptor = getOwnPropertyDescriptorModule.f;
	var nativeDefineProperty = definePropertyModule.f;
	var nativeGetOwnPropertyNames = getOwnPropertyNamesExternal.f;
	var nativePropertyIsEnumerable = propertyIsEnumerableModule.f;
	var push = uncurryThis([].push);

	var AllSymbols = shared('symbols');
	var ObjectPrototypeSymbols = shared('op-symbols');
	var WellKnownSymbolsStore = shared('wks');

	// Don't use setters in Qt Script, https://github.com/zloirock/core-js/issues/173
	var USE_SETTER = !QObject || !QObject[PROTOTYPE] || !QObject[PROTOTYPE].findChild;

	// fallback for old Android, https://code.google.com/p/v8/issues/detail?id=687
	var fallbackDefineProperty = function (O, P, Attributes) {
	  var ObjectPrototypeDescriptor = nativeGetOwnPropertyDescriptor(ObjectPrototype, P);
	  if (ObjectPrototypeDescriptor) delete ObjectPrototype[P];
	  nativeDefineProperty(O, P, Attributes);
	  if (ObjectPrototypeDescriptor && O !== ObjectPrototype) {
	    nativeDefineProperty(ObjectPrototype, P, ObjectPrototypeDescriptor);
	  }
	};

	var setSymbolDescriptor = DESCRIPTORS && fails(function () {
	  return nativeObjectCreate(nativeDefineProperty({}, 'a', {
	    get: function () { return nativeDefineProperty(this, 'a', { value: 7 }).a; }
	  })).a !== 7;
	}) ? fallbackDefineProperty : nativeDefineProperty;

	var wrap = function (tag, description) {
	  var symbol = AllSymbols[tag] = nativeObjectCreate(SymbolPrototype);
	  setInternalState(symbol, {
	    type: SYMBOL,
	    tag: tag,
	    description: description
	  });
	  if (!DESCRIPTORS) symbol.description = description;
	  return symbol;
	};

	var $defineProperty = function defineProperty(O, P, Attributes) {
	  if (O === ObjectPrototype) $defineProperty(ObjectPrototypeSymbols, P, Attributes);
	  anObject(O);
	  var key = toPropertyKey(P);
	  anObject(Attributes);
	  if (hasOwn(AllSymbols, key)) {
	    if (!Attributes.enumerable) {
	      if (!hasOwn(O, HIDDEN)) nativeDefineProperty(O, HIDDEN, createPropertyDescriptor(1, nativeObjectCreate(null)));
	      O[HIDDEN][key] = true;
	    } else {
	      if (hasOwn(O, HIDDEN) && O[HIDDEN][key]) O[HIDDEN][key] = false;
	      Attributes = nativeObjectCreate(Attributes, { enumerable: createPropertyDescriptor(0, false) });
	    } return setSymbolDescriptor(O, key, Attributes);
	  } return nativeDefineProperty(O, key, Attributes);
	};

	var $defineProperties = function defineProperties(O, Properties) {
	  anObject(O);
	  var properties = toIndexedObject(Properties);
	  var keys = objectKeys(properties).concat($getOwnPropertySymbols(properties));
	  $forEach(keys, function (key) {
	    if (!DESCRIPTORS || call($propertyIsEnumerable, properties, key)) $defineProperty(O, key, properties[key]);
	  });
	  return O;
	};

	var $create = function create(O, Properties) {
	  return Properties === undefined ? nativeObjectCreate(O) : $defineProperties(nativeObjectCreate(O), Properties);
	};

	var $propertyIsEnumerable = function propertyIsEnumerable(V) {
	  var P = toPropertyKey(V);
	  var enumerable = call(nativePropertyIsEnumerable, this, P);
	  if (this === ObjectPrototype && hasOwn(AllSymbols, P) && !hasOwn(ObjectPrototypeSymbols, P)) return false;
	  return enumerable || !hasOwn(this, P) || !hasOwn(AllSymbols, P) || hasOwn(this, HIDDEN) && this[HIDDEN][P]
	    ? enumerable : true;
	};

	var $getOwnPropertyDescriptor = function getOwnPropertyDescriptor(O, P) {
	  var it = toIndexedObject(O);
	  var key = toPropertyKey(P);
	  if (it === ObjectPrototype && hasOwn(AllSymbols, key) && !hasOwn(ObjectPrototypeSymbols, key)) return;
	  var descriptor = nativeGetOwnPropertyDescriptor(it, key);
	  if (descriptor && hasOwn(AllSymbols, key) && !(hasOwn(it, HIDDEN) && it[HIDDEN][key])) {
	    descriptor.enumerable = true;
	  }
	  return descriptor;
	};

	var $getOwnPropertyNames = function getOwnPropertyNames(O) {
	  var names = nativeGetOwnPropertyNames(toIndexedObject(O));
	  var result = [];
	  $forEach(names, function (key) {
	    if (!hasOwn(AllSymbols, key) && !hasOwn(hiddenKeys, key)) push(result, key);
	  });
	  return result;
	};

	var $getOwnPropertySymbols = function (O) {
	  var IS_OBJECT_PROTOTYPE = O === ObjectPrototype;
	  var names = nativeGetOwnPropertyNames(IS_OBJECT_PROTOTYPE ? ObjectPrototypeSymbols : toIndexedObject(O));
	  var result = [];
	  $forEach(names, function (key) {
	    if (hasOwn(AllSymbols, key) && (!IS_OBJECT_PROTOTYPE || hasOwn(ObjectPrototype, key))) {
	      push(result, AllSymbols[key]);
	    }
	  });
	  return result;
	};

	// `Symbol` constructor
	// https://tc39.es/ecma262/#sec-symbol-constructor
	if (!NATIVE_SYMBOL) {
	  $Symbol = function Symbol() {
	    if (isPrototypeOf(SymbolPrototype, this)) throw new TypeError('Symbol is not a constructor');
	    var description = !arguments.length || arguments[0] === undefined ? undefined : $toString(arguments[0]);
	    var tag = uid(description);
	    var setter = function (value) {
	      var $this = this === undefined ? globalThis : this;
	      if ($this === ObjectPrototype) call(setter, ObjectPrototypeSymbols, value);
	      if (hasOwn($this, HIDDEN) && hasOwn($this[HIDDEN], tag)) $this[HIDDEN][tag] = false;
	      var descriptor = createPropertyDescriptor(1, value);
	      try {
	        setSymbolDescriptor($this, tag, descriptor);
	      } catch (error) {
	        if (!(error instanceof RangeError)) throw error;
	        fallbackDefineProperty($this, tag, descriptor);
	      }
	    };
	    if (DESCRIPTORS && USE_SETTER) setSymbolDescriptor(ObjectPrototype, tag, { configurable: true, set: setter });
	    return wrap(tag, description);
	  };

	  SymbolPrototype = $Symbol[PROTOTYPE];

	  defineBuiltIn(SymbolPrototype, 'toString', function toString() {
	    return getInternalState(this).tag;
	  });

	  defineBuiltIn($Symbol, 'withoutSetter', function (description) {
	    return wrap(uid(description), description);
	  });

	  propertyIsEnumerableModule.f = $propertyIsEnumerable;
	  definePropertyModule.f = $defineProperty;
	  definePropertiesModule.f = $defineProperties;
	  getOwnPropertyDescriptorModule.f = $getOwnPropertyDescriptor;
	  getOwnPropertyNamesModule.f = getOwnPropertyNamesExternal.f = $getOwnPropertyNames;
	  getOwnPropertySymbolsModule.f = $getOwnPropertySymbols;

	  wrappedWellKnownSymbolModule.f = function (name) {
	    return wrap(wellKnownSymbol(name), name);
	  };

	  if (DESCRIPTORS) {
	    // https://tc39.es/ecma262/#sec-symbol.prototype.description
	    defineBuiltInAccessor(SymbolPrototype, 'description', {
	      configurable: true,
	      get: function description() {
	        return getInternalState(this).description;
	      }
	    });
	    if (!IS_PURE) {
	      defineBuiltIn(ObjectPrototype, 'propertyIsEnumerable', $propertyIsEnumerable, { unsafe: true });
	    }
	  }
	}

	$({ global: true, constructor: true, wrap: true, forced: !NATIVE_SYMBOL, sham: !NATIVE_SYMBOL }, {
	  Symbol: $Symbol
	});

	$forEach(objectKeys(WellKnownSymbolsStore), function (name) {
	  defineWellKnownSymbol(name);
	});

	$({ target: SYMBOL, stat: true, forced: !NATIVE_SYMBOL }, {
	  useSetter: function () { USE_SETTER = true; },
	  useSimple: function () { USE_SETTER = false; }
	});

	$({ target: 'Object', stat: true, forced: !NATIVE_SYMBOL, sham: !DESCRIPTORS }, {
	  // `Object.create` method
	  // https://tc39.es/ecma262/#sec-object.create
	  create: $create,
	  // `Object.defineProperty` method
	  // https://tc39.es/ecma262/#sec-object.defineproperty
	  defineProperty: $defineProperty,
	  // `Object.defineProperties` method
	  // https://tc39.es/ecma262/#sec-object.defineproperties
	  defineProperties: $defineProperties,
	  // `Object.getOwnPropertyDescriptor` method
	  // https://tc39.es/ecma262/#sec-object.getownpropertydescriptors
	  getOwnPropertyDescriptor: $getOwnPropertyDescriptor
	});

	$({ target: 'Object', stat: true, forced: !NATIVE_SYMBOL }, {
	  // `Object.getOwnPropertyNames` method
	  // https://tc39.es/ecma262/#sec-object.getownpropertynames
	  getOwnPropertyNames: $getOwnPropertyNames
	});

	// `Symbol.prototype[@@toPrimitive]` method
	// https://tc39.es/ecma262/#sec-symbol.prototype-@@toprimitive
	defineSymbolToPrimitive();

	// `Symbol.prototype[@@toStringTag]` property
	// https://tc39.es/ecma262/#sec-symbol.prototype-@@tostringtag
	setToStringTag($Symbol, SYMBOL);

	hiddenKeys[HIDDEN] = true;
	return es_symbol_constructor;
}

var es_symbol_for = {};

var symbolRegistryDetection;
var hasRequiredSymbolRegistryDetection;

function requireSymbolRegistryDetection () {
	if (hasRequiredSymbolRegistryDetection) return symbolRegistryDetection;
	hasRequiredSymbolRegistryDetection = 1;
	var NATIVE_SYMBOL = /*@__PURE__*/ requireSymbolConstructorDetection();

	/* eslint-disable es/no-symbol -- safe */
	symbolRegistryDetection = NATIVE_SYMBOL && !!Symbol['for'] && !!Symbol.keyFor;
	return symbolRegistryDetection;
}

var hasRequiredEs_symbol_for;

function requireEs_symbol_for () {
	if (hasRequiredEs_symbol_for) return es_symbol_for;
	hasRequiredEs_symbol_for = 1;
	var $ = /*@__PURE__*/ require_export();
	var getBuiltIn = /*@__PURE__*/ requireGetBuiltIn();
	var hasOwn = /*@__PURE__*/ requireHasOwnProperty();
	var toString = /*@__PURE__*/ requireToString();
	var shared = /*@__PURE__*/ requireShared();
	var NATIVE_SYMBOL_REGISTRY = /*@__PURE__*/ requireSymbolRegistryDetection();

	var StringToSymbolRegistry = shared('string-to-symbol-registry');
	var SymbolToStringRegistry = shared('symbol-to-string-registry');

	// `Symbol.for` method
	// https://tc39.es/ecma262/#sec-symbol.for
	$({ target: 'Symbol', stat: true, forced: !NATIVE_SYMBOL_REGISTRY }, {
	  'for': function (key) {
	    var string = toString(key);
	    if (hasOwn(StringToSymbolRegistry, string)) return StringToSymbolRegistry[string];
	    var symbol = getBuiltIn('Symbol')(string);
	    StringToSymbolRegistry[string] = symbol;
	    SymbolToStringRegistry[symbol] = string;
	    return symbol;
	  }
	});
	return es_symbol_for;
}

var es_symbol_keyFor = {};

var hasRequiredEs_symbol_keyFor;

function requireEs_symbol_keyFor () {
	if (hasRequiredEs_symbol_keyFor) return es_symbol_keyFor;
	hasRequiredEs_symbol_keyFor = 1;
	var $ = /*@__PURE__*/ require_export();
	var hasOwn = /*@__PURE__*/ requireHasOwnProperty();
	var isSymbol = /*@__PURE__*/ requireIsSymbol();
	var tryToString = /*@__PURE__*/ requireTryToString();
	var shared = /*@__PURE__*/ requireShared();
	var NATIVE_SYMBOL_REGISTRY = /*@__PURE__*/ requireSymbolRegistryDetection();

	var SymbolToStringRegistry = shared('symbol-to-string-registry');

	// `Symbol.keyFor` method
	// https://tc39.es/ecma262/#sec-symbol.keyfor
	$({ target: 'Symbol', stat: true, forced: !NATIVE_SYMBOL_REGISTRY }, {
	  keyFor: function keyFor(sym) {
	    if (!isSymbol(sym)) throw new TypeError(tryToString(sym) + ' is not a symbol');
	    if (hasOwn(SymbolToStringRegistry, sym)) return SymbolToStringRegistry[sym];
	  }
	});
	return es_symbol_keyFor;
}

var es_json_stringify = {};

var getJsonReplacerFunction;
var hasRequiredGetJsonReplacerFunction;

function requireGetJsonReplacerFunction () {
	if (hasRequiredGetJsonReplacerFunction) return getJsonReplacerFunction;
	hasRequiredGetJsonReplacerFunction = 1;
	var uncurryThis = /*@__PURE__*/ requireFunctionUncurryThis();
	var isArray = /*@__PURE__*/ requireIsArray$3();
	var isCallable = /*@__PURE__*/ requireIsCallable();
	var classof = /*@__PURE__*/ requireClassofRaw();
	var toString = /*@__PURE__*/ requireToString();

	var push = uncurryThis([].push);

	getJsonReplacerFunction = function (replacer) {
	  if (isCallable(replacer)) return replacer;
	  if (!isArray(replacer)) return;
	  var rawLength = replacer.length;
	  var keys = [];
	  for (var i = 0; i < rawLength; i++) {
	    var element = replacer[i];
	    if (typeof element == 'string') push(keys, element);
	    else if (typeof element == 'number' || classof(element) === 'Number' || classof(element) === 'String') push(keys, toString(element));
	  }
	  var keysLength = keys.length;
	  var root = true;
	  return function (key, value) {
	    if (root) {
	      root = false;
	      return value;
	    }
	    if (isArray(this)) return value;
	    for (var j = 0; j < keysLength; j++) if (keys[j] === key) return value;
	  };
	};
	return getJsonReplacerFunction;
}

var hasRequiredEs_json_stringify;

function requireEs_json_stringify () {
	if (hasRequiredEs_json_stringify) return es_json_stringify;
	hasRequiredEs_json_stringify = 1;
	var $ = /*@__PURE__*/ require_export();
	var getBuiltIn = /*@__PURE__*/ requireGetBuiltIn();
	var apply = /*@__PURE__*/ requireFunctionApply();
	var call = /*@__PURE__*/ requireFunctionCall();
	var uncurryThis = /*@__PURE__*/ requireFunctionUncurryThis();
	var fails = /*@__PURE__*/ requireFails();
	var isCallable = /*@__PURE__*/ requireIsCallable();
	var isSymbol = /*@__PURE__*/ requireIsSymbol();
	var arraySlice = /*@__PURE__*/ requireArraySlice();
	var getReplacerFunction = /*@__PURE__*/ requireGetJsonReplacerFunction();
	var NATIVE_SYMBOL = /*@__PURE__*/ requireSymbolConstructorDetection();

	var $String = String;
	var $stringify = getBuiltIn('JSON', 'stringify');
	var exec = uncurryThis(/./.exec);
	var charAt = uncurryThis(''.charAt);
	var charCodeAt = uncurryThis(''.charCodeAt);
	var replace = uncurryThis(''.replace);
	var numberToString = uncurryThis(1.1.toString);

	var tester = /[\uD800-\uDFFF]/g;
	var low = /^[\uD800-\uDBFF]$/;
	var hi = /^[\uDC00-\uDFFF]$/;

	var WRONG_SYMBOLS_CONVERSION = !NATIVE_SYMBOL || fails(function () {
	  var symbol = getBuiltIn('Symbol')('stringify detection');
	  // MS Edge converts symbol values to JSON as {}
	  return $stringify([symbol]) !== '[null]'
	    // WebKit converts symbol values to JSON as null
	    || $stringify({ a: symbol }) !== '{}'
	    // V8 throws on boxed symbols
	    || $stringify(Object(symbol)) !== '{}';
	});

	// https://github.com/tc39/proposal-well-formed-stringify
	var ILL_FORMED_UNICODE = fails(function () {
	  return $stringify('\uDF06\uD834') !== '"\\udf06\\ud834"'
	    || $stringify('\uDEAD') !== '"\\udead"';
	});

	var stringifyWithSymbolsFix = function (it, replacer) {
	  var args = arraySlice(arguments);
	  var $replacer = getReplacerFunction(replacer);
	  if (!isCallable($replacer) && (it === undefined || isSymbol(it))) return; // IE8 returns string on undefined
	  args[1] = function (key, value) {
	    // some old implementations (like WebKit) could pass numbers as keys
	    if (isCallable($replacer)) value = call($replacer, this, $String(key), value);
	    if (!isSymbol(value)) return value;
	  };
	  return apply($stringify, null, args);
	};

	var fixIllFormed = function (match, offset, string) {
	  var prev = charAt(string, offset - 1);
	  var next = charAt(string, offset + 1);
	  if ((exec(low, match) && !exec(hi, next)) || (exec(hi, match) && !exec(low, prev))) {
	    return '\\u' + numberToString(charCodeAt(match, 0), 16);
	  } return match;
	};

	if ($stringify) {
	  // `JSON.stringify` method
	  // https://tc39.es/ecma262/#sec-json.stringify
	  $({ target: 'JSON', stat: true, arity: 3, forced: WRONG_SYMBOLS_CONVERSION || ILL_FORMED_UNICODE }, {
	    // eslint-disable-next-line no-unused-vars -- required for `.length`
	    stringify: function stringify(it, replacer, space) {
	      var args = arraySlice(arguments);
	      var result = apply(WRONG_SYMBOLS_CONVERSION ? stringifyWithSymbolsFix : $stringify, null, args);
	      return ILL_FORMED_UNICODE && typeof result == 'string' ? replace(result, tester, fixIllFormed) : result;
	    }
	  });
	}
	return es_json_stringify;
}

var es_object_getOwnPropertySymbols = {};

var hasRequiredEs_object_getOwnPropertySymbols;

function requireEs_object_getOwnPropertySymbols () {
	if (hasRequiredEs_object_getOwnPropertySymbols) return es_object_getOwnPropertySymbols;
	hasRequiredEs_object_getOwnPropertySymbols = 1;
	var $ = /*@__PURE__*/ require_export();
	var NATIVE_SYMBOL = /*@__PURE__*/ requireSymbolConstructorDetection();
	var fails = /*@__PURE__*/ requireFails();
	var getOwnPropertySymbolsModule = /*@__PURE__*/ requireObjectGetOwnPropertySymbols();
	var toObject = /*@__PURE__*/ requireToObject();

	// V8 ~ Chrome 38 and 39 `Object.getOwnPropertySymbols` fails on primitives
	// https://bugs.chromium.org/p/v8/issues/detail?id=3443
	var FORCED = !NATIVE_SYMBOL || fails(function () { getOwnPropertySymbolsModule.f(1); });

	// `Object.getOwnPropertySymbols` method
	// https://tc39.es/ecma262/#sec-object.getownpropertysymbols
	$({ target: 'Object', stat: true, forced: FORCED }, {
	  getOwnPropertySymbols: function getOwnPropertySymbols(it) {
	    var $getOwnPropertySymbols = getOwnPropertySymbolsModule.f;
	    return $getOwnPropertySymbols ? $getOwnPropertySymbols(toObject(it)) : [];
	  }
	});
	return es_object_getOwnPropertySymbols;
}

var hasRequiredEs_symbol;

function requireEs_symbol () {
	if (hasRequiredEs_symbol) return es_symbol;
	hasRequiredEs_symbol = 1;
	// TODO: Remove this module from `core-js@4` since it's split to modules listed below
	requireEs_symbol_constructor();
	requireEs_symbol_for();
	requireEs_symbol_keyFor();
	requireEs_json_stringify();
	requireEs_object_getOwnPropertySymbols();
	return es_symbol;
}

var getOwnPropertySymbols$2;
var hasRequiredGetOwnPropertySymbols$2;

function requireGetOwnPropertySymbols$2 () {
	if (hasRequiredGetOwnPropertySymbols$2) return getOwnPropertySymbols$2;
	hasRequiredGetOwnPropertySymbols$2 = 1;
	requireEs_symbol();
	var path = /*@__PURE__*/ requirePath();

	getOwnPropertySymbols$2 = path.Object.getOwnPropertySymbols;
	return getOwnPropertySymbols$2;
}

var getOwnPropertySymbols$1;
var hasRequiredGetOwnPropertySymbols$1;

function requireGetOwnPropertySymbols$1 () {
	if (hasRequiredGetOwnPropertySymbols$1) return getOwnPropertySymbols$1;
	hasRequiredGetOwnPropertySymbols$1 = 1;
	var parent = /*@__PURE__*/ requireGetOwnPropertySymbols$2();

	getOwnPropertySymbols$1 = parent;
	return getOwnPropertySymbols$1;
}

var getOwnPropertySymbols;
var hasRequiredGetOwnPropertySymbols;

function requireGetOwnPropertySymbols () {
	if (hasRequiredGetOwnPropertySymbols) return getOwnPropertySymbols;
	hasRequiredGetOwnPropertySymbols = 1;
	getOwnPropertySymbols = /*@__PURE__*/ requireGetOwnPropertySymbols$1();
	return getOwnPropertySymbols;
}

var getOwnPropertySymbolsExports = requireGetOwnPropertySymbols();
var _Object$getOwnPropertySymbols = /*@__PURE__*/getDefaultExportFromCjs(getOwnPropertySymbolsExports);

var es_array_filter = {};

var arrayMethodHasSpeciesSupport;
var hasRequiredArrayMethodHasSpeciesSupport;

function requireArrayMethodHasSpeciesSupport () {
	if (hasRequiredArrayMethodHasSpeciesSupport) return arrayMethodHasSpeciesSupport;
	hasRequiredArrayMethodHasSpeciesSupport = 1;
	var fails = /*@__PURE__*/ requireFails();
	var wellKnownSymbol = /*@__PURE__*/ requireWellKnownSymbol();
	var V8_VERSION = /*@__PURE__*/ requireEnvironmentV8Version();

	var SPECIES = wellKnownSymbol('species');

	arrayMethodHasSpeciesSupport = function (METHOD_NAME) {
	  // We can't use this feature detection in V8 since it causes
	  // deoptimization and serious performance degradation
	  // https://github.com/zloirock/core-js/issues/677
	  return V8_VERSION >= 51 || !fails(function () {
	    var array = [];
	    var constructor = array.constructor = {};
	    constructor[SPECIES] = function () {
	      return { foo: 1 };
	    };
	    return array[METHOD_NAME](Boolean).foo !== 1;
	  });
	};
	return arrayMethodHasSpeciesSupport;
}

var hasRequiredEs_array_filter;

function requireEs_array_filter () {
	if (hasRequiredEs_array_filter) return es_array_filter;
	hasRequiredEs_array_filter = 1;
	var $ = /*@__PURE__*/ require_export();
	var $filter = /*@__PURE__*/ requireArrayIteration().filter;
	var arrayMethodHasSpeciesSupport = /*@__PURE__*/ requireArrayMethodHasSpeciesSupport();

	var HAS_SPECIES_SUPPORT = arrayMethodHasSpeciesSupport('filter');

	// `Array.prototype.filter` method
	// https://tc39.es/ecma262/#sec-array.prototype.filter
	// with adding support of @@species
	$({ target: 'Array', proto: true, forced: !HAS_SPECIES_SUPPORT }, {
	  filter: function filter(callbackfn /* , thisArg */) {
	    return $filter(this, callbackfn, arguments.length > 1 ? arguments[1] : undefined);
	  }
	});
	return es_array_filter;
}

var filter$3;
var hasRequiredFilter$3;

function requireFilter$3 () {
	if (hasRequiredFilter$3) return filter$3;
	hasRequiredFilter$3 = 1;
	requireEs_array_filter();
	var getBuiltInPrototypeMethod = /*@__PURE__*/ requireGetBuiltInPrototypeMethod();

	filter$3 = getBuiltInPrototypeMethod('Array', 'filter');
	return filter$3;
}

var filter$2;
var hasRequiredFilter$2;

function requireFilter$2 () {
	if (hasRequiredFilter$2) return filter$2;
	hasRequiredFilter$2 = 1;
	var isPrototypeOf = /*@__PURE__*/ requireObjectIsPrototypeOf();
	var method = /*@__PURE__*/ requireFilter$3();

	var ArrayPrototype = Array.prototype;

	filter$2 = function (it) {
	  var own = it.filter;
	  return it === ArrayPrototype || (isPrototypeOf(ArrayPrototype, it) && own === ArrayPrototype.filter) ? method : own;
	};
	return filter$2;
}

var filter$1;
var hasRequiredFilter$1;

function requireFilter$1 () {
	if (hasRequiredFilter$1) return filter$1;
	hasRequiredFilter$1 = 1;
	var parent = /*@__PURE__*/ requireFilter$2();

	filter$1 = parent;
	return filter$1;
}

var filter;
var hasRequiredFilter;

function requireFilter () {
	if (hasRequiredFilter) return filter;
	hasRequiredFilter = 1;
	filter = /*@__PURE__*/ requireFilter$1();
	return filter;
}

var filterExports = requireFilter();
var _filterInstanceProperty = /*@__PURE__*/getDefaultExportFromCjs(filterExports);

var getOwnPropertyDescriptor$2 = {exports: {}};

var es_object_getOwnPropertyDescriptor = {};

var hasRequiredEs_object_getOwnPropertyDescriptor;

function requireEs_object_getOwnPropertyDescriptor () {
	if (hasRequiredEs_object_getOwnPropertyDescriptor) return es_object_getOwnPropertyDescriptor;
	hasRequiredEs_object_getOwnPropertyDescriptor = 1;
	var $ = /*@__PURE__*/ require_export();
	var fails = /*@__PURE__*/ requireFails();
	var toIndexedObject = /*@__PURE__*/ requireToIndexedObject();
	var nativeGetOwnPropertyDescriptor = /*@__PURE__*/ requireObjectGetOwnPropertyDescriptor().f;
	var DESCRIPTORS = /*@__PURE__*/ requireDescriptors();

	var FORCED = !DESCRIPTORS || fails(function () { nativeGetOwnPropertyDescriptor(1); });

	// `Object.getOwnPropertyDescriptor` method
	// https://tc39.es/ecma262/#sec-object.getownpropertydescriptor
	$({ target: 'Object', stat: true, forced: FORCED, sham: !DESCRIPTORS }, {
	  getOwnPropertyDescriptor: function getOwnPropertyDescriptor(it, key) {
	    return nativeGetOwnPropertyDescriptor(toIndexedObject(it), key);
	  }
	});
	return es_object_getOwnPropertyDescriptor;
}

var hasRequiredGetOwnPropertyDescriptor$2;

function requireGetOwnPropertyDescriptor$2 () {
	if (hasRequiredGetOwnPropertyDescriptor$2) return getOwnPropertyDescriptor$2.exports;
	hasRequiredGetOwnPropertyDescriptor$2 = 1;
	requireEs_object_getOwnPropertyDescriptor();
	var path = /*@__PURE__*/ requirePath();

	var Object = path.Object;

	var getOwnPropertyDescriptor = getOwnPropertyDescriptor$2.exports = function getOwnPropertyDescriptor(it, key) {
	  return Object.getOwnPropertyDescriptor(it, key);
	};

	if (Object.getOwnPropertyDescriptor.sham) getOwnPropertyDescriptor.sham = true;
	return getOwnPropertyDescriptor$2.exports;
}

var getOwnPropertyDescriptor$1;
var hasRequiredGetOwnPropertyDescriptor$1;

function requireGetOwnPropertyDescriptor$1 () {
	if (hasRequiredGetOwnPropertyDescriptor$1) return getOwnPropertyDescriptor$1;
	hasRequiredGetOwnPropertyDescriptor$1 = 1;
	var parent = /*@__PURE__*/ requireGetOwnPropertyDescriptor$2();

	getOwnPropertyDescriptor$1 = parent;
	return getOwnPropertyDescriptor$1;
}

var getOwnPropertyDescriptor;
var hasRequiredGetOwnPropertyDescriptor;

function requireGetOwnPropertyDescriptor () {
	if (hasRequiredGetOwnPropertyDescriptor) return getOwnPropertyDescriptor;
	hasRequiredGetOwnPropertyDescriptor = 1;
	getOwnPropertyDescriptor = /*@__PURE__*/ requireGetOwnPropertyDescriptor$1();
	return getOwnPropertyDescriptor;
}

var getOwnPropertyDescriptorExports = requireGetOwnPropertyDescriptor();
var _Object$getOwnPropertyDescriptor = /*@__PURE__*/getDefaultExportFromCjs(getOwnPropertyDescriptorExports);

var es_object_getOwnPropertyDescriptors = {};

var ownKeys$4;
var hasRequiredOwnKeys$3;

function requireOwnKeys$3 () {
	if (hasRequiredOwnKeys$3) return ownKeys$4;
	hasRequiredOwnKeys$3 = 1;
	var getBuiltIn = /*@__PURE__*/ requireGetBuiltIn();
	var uncurryThis = /*@__PURE__*/ requireFunctionUncurryThis();
	var getOwnPropertyNamesModule = /*@__PURE__*/ requireObjectGetOwnPropertyNames();
	var getOwnPropertySymbolsModule = /*@__PURE__*/ requireObjectGetOwnPropertySymbols();
	var anObject = /*@__PURE__*/ requireAnObject();

	var concat = uncurryThis([].concat);

	// all object keys, includes non-enumerable and symbols
	ownKeys$4 = getBuiltIn('Reflect', 'ownKeys') || function ownKeys(it) {
	  var keys = getOwnPropertyNamesModule.f(anObject(it));
	  var getOwnPropertySymbols = getOwnPropertySymbolsModule.f;
	  return getOwnPropertySymbols ? concat(keys, getOwnPropertySymbols(it)) : keys;
	};
	return ownKeys$4;
}

var createProperty;
var hasRequiredCreateProperty;

function requireCreateProperty () {
	if (hasRequiredCreateProperty) return createProperty;
	hasRequiredCreateProperty = 1;
	var DESCRIPTORS = /*@__PURE__*/ requireDescriptors();
	var definePropertyModule = /*@__PURE__*/ requireObjectDefineProperty();
	var createPropertyDescriptor = /*@__PURE__*/ requireCreatePropertyDescriptor();

	createProperty = function (object, key, value) {
	  if (DESCRIPTORS) definePropertyModule.f(object, key, createPropertyDescriptor(0, value));
	  else object[key] = value;
	};
	return createProperty;
}

var hasRequiredEs_object_getOwnPropertyDescriptors;

function requireEs_object_getOwnPropertyDescriptors () {
	if (hasRequiredEs_object_getOwnPropertyDescriptors) return es_object_getOwnPropertyDescriptors;
	hasRequiredEs_object_getOwnPropertyDescriptors = 1;
	var $ = /*@__PURE__*/ require_export();
	var DESCRIPTORS = /*@__PURE__*/ requireDescriptors();
	var ownKeys = /*@__PURE__*/ requireOwnKeys$3();
	var toIndexedObject = /*@__PURE__*/ requireToIndexedObject();
	var getOwnPropertyDescriptorModule = /*@__PURE__*/ requireObjectGetOwnPropertyDescriptor();
	var createProperty = /*@__PURE__*/ requireCreateProperty();

	// `Object.getOwnPropertyDescriptors` method
	// https://tc39.es/ecma262/#sec-object.getownpropertydescriptors
	$({ target: 'Object', stat: true, sham: !DESCRIPTORS }, {
	  getOwnPropertyDescriptors: function getOwnPropertyDescriptors(object) {
	    var O = toIndexedObject(object);
	    var getOwnPropertyDescriptor = getOwnPropertyDescriptorModule.f;
	    var keys = ownKeys(O);
	    var result = {};
	    var index = 0;
	    var key, descriptor;
	    while (keys.length > index) {
	      descriptor = getOwnPropertyDescriptor(O, key = keys[index++]);
	      if (descriptor !== undefined) createProperty(result, key, descriptor);
	    }
	    return result;
	  }
	});
	return es_object_getOwnPropertyDescriptors;
}

var getOwnPropertyDescriptors$2;
var hasRequiredGetOwnPropertyDescriptors$2;

function requireGetOwnPropertyDescriptors$2 () {
	if (hasRequiredGetOwnPropertyDescriptors$2) return getOwnPropertyDescriptors$2;
	hasRequiredGetOwnPropertyDescriptors$2 = 1;
	requireEs_object_getOwnPropertyDescriptors();
	var path = /*@__PURE__*/ requirePath();

	getOwnPropertyDescriptors$2 = path.Object.getOwnPropertyDescriptors;
	return getOwnPropertyDescriptors$2;
}

var getOwnPropertyDescriptors$1;
var hasRequiredGetOwnPropertyDescriptors$1;

function requireGetOwnPropertyDescriptors$1 () {
	if (hasRequiredGetOwnPropertyDescriptors$1) return getOwnPropertyDescriptors$1;
	hasRequiredGetOwnPropertyDescriptors$1 = 1;
	var parent = /*@__PURE__*/ requireGetOwnPropertyDescriptors$2();

	getOwnPropertyDescriptors$1 = parent;
	return getOwnPropertyDescriptors$1;
}

var getOwnPropertyDescriptors;
var hasRequiredGetOwnPropertyDescriptors;

function requireGetOwnPropertyDescriptors () {
	if (hasRequiredGetOwnPropertyDescriptors) return getOwnPropertyDescriptors;
	hasRequiredGetOwnPropertyDescriptors = 1;
	getOwnPropertyDescriptors = /*@__PURE__*/ requireGetOwnPropertyDescriptors$1();
	return getOwnPropertyDescriptors;
}

var getOwnPropertyDescriptorsExports = requireGetOwnPropertyDescriptors();
var _Object$getOwnPropertyDescriptors = /*@__PURE__*/getDefaultExportFromCjs(getOwnPropertyDescriptorsExports);

var defineProperties$2 = {exports: {}};

var es_object_defineProperties = {};

var hasRequiredEs_object_defineProperties;

function requireEs_object_defineProperties () {
	if (hasRequiredEs_object_defineProperties) return es_object_defineProperties;
	hasRequiredEs_object_defineProperties = 1;
	var $ = /*@__PURE__*/ require_export();
	var DESCRIPTORS = /*@__PURE__*/ requireDescriptors();
	var defineProperties = /*@__PURE__*/ requireObjectDefineProperties().f;

	// `Object.defineProperties` method
	// https://tc39.es/ecma262/#sec-object.defineproperties
	// eslint-disable-next-line es/no-object-defineproperties -- safe
	$({ target: 'Object', stat: true, forced: Object.defineProperties !== defineProperties, sham: !DESCRIPTORS }, {
	  defineProperties: defineProperties
	});
	return es_object_defineProperties;
}

var hasRequiredDefineProperties$2;

function requireDefineProperties$2 () {
	if (hasRequiredDefineProperties$2) return defineProperties$2.exports;
	hasRequiredDefineProperties$2 = 1;
	requireEs_object_defineProperties();
	var path = /*@__PURE__*/ requirePath();

	var Object = path.Object;

	var defineProperties = defineProperties$2.exports = function defineProperties(T, D) {
	  return Object.defineProperties(T, D);
	};

	if (Object.defineProperties.sham) defineProperties.sham = true;
	return defineProperties$2.exports;
}

var defineProperties$1;
var hasRequiredDefineProperties$1;

function requireDefineProperties$1 () {
	if (hasRequiredDefineProperties$1) return defineProperties$1;
	hasRequiredDefineProperties$1 = 1;
	var parent = /*@__PURE__*/ requireDefineProperties$2();

	defineProperties$1 = parent;
	return defineProperties$1;
}

var defineProperties;
var hasRequiredDefineProperties;

function requireDefineProperties () {
	if (hasRequiredDefineProperties) return defineProperties;
	hasRequiredDefineProperties = 1;
	defineProperties = /*@__PURE__*/ requireDefineProperties$1();
	return defineProperties;
}

var definePropertiesExports = requireDefineProperties();
var _Object$defineProperties = /*@__PURE__*/getDefaultExportFromCjs(definePropertiesExports);

var defineProperty$5 = {exports: {}};

var es_object_defineProperty = {};

var hasRequiredEs_object_defineProperty;

function requireEs_object_defineProperty () {
	if (hasRequiredEs_object_defineProperty) return es_object_defineProperty;
	hasRequiredEs_object_defineProperty = 1;
	var $ = /*@__PURE__*/ require_export();
	var DESCRIPTORS = /*@__PURE__*/ requireDescriptors();
	var defineProperty = /*@__PURE__*/ requireObjectDefineProperty().f;

	// `Object.defineProperty` method
	// https://tc39.es/ecma262/#sec-object.defineproperty
	// eslint-disable-next-line es/no-object-defineproperty -- safe
	$({ target: 'Object', stat: true, forced: Object.defineProperty !== defineProperty, sham: !DESCRIPTORS }, {
	  defineProperty: defineProperty
	});
	return es_object_defineProperty;
}

var hasRequiredDefineProperty$5;

function requireDefineProperty$5 () {
	if (hasRequiredDefineProperty$5) return defineProperty$5.exports;
	hasRequiredDefineProperty$5 = 1;
	requireEs_object_defineProperty();
	var path = /*@__PURE__*/ requirePath();

	var Object = path.Object;

	var defineProperty = defineProperty$5.exports = function defineProperty(it, key, desc) {
	  return Object.defineProperty(it, key, desc);
	};

	if (Object.defineProperty.sham) defineProperty.sham = true;
	return defineProperty$5.exports;
}

var defineProperty$4;
var hasRequiredDefineProperty$4;

function requireDefineProperty$4 () {
	if (hasRequiredDefineProperty$4) return defineProperty$4;
	hasRequiredDefineProperty$4 = 1;
	var parent = /*@__PURE__*/ requireDefineProperty$5();

	defineProperty$4 = parent;
	return defineProperty$4;
}

var defineProperty$3;
var hasRequiredDefineProperty$3;

function requireDefineProperty$3 () {
	if (hasRequiredDefineProperty$3) return defineProperty$3;
	hasRequiredDefineProperty$3 = 1;
	var parent = /*@__PURE__*/ requireDefineProperty$4();

	defineProperty$3 = parent;
	return defineProperty$3;
}

var defineProperty$2;
var hasRequiredDefineProperty$2;

function requireDefineProperty$2 () {
	if (hasRequiredDefineProperty$2) return defineProperty$2;
	hasRequiredDefineProperty$2 = 1;
	var parent = /*@__PURE__*/ requireDefineProperty$3();

	defineProperty$2 = parent;
	return defineProperty$2;
}

var defineProperty$1;
var hasRequiredDefineProperty$1;

function requireDefineProperty$1 () {
	if (hasRequiredDefineProperty$1) return defineProperty$1;
	hasRequiredDefineProperty$1 = 1;
	defineProperty$1 = /*@__PURE__*/ requireDefineProperty$2();
	return defineProperty$1;
}

var definePropertyExports$1 = /*@__PURE__*/ requireDefineProperty$1();
var _Object$defineProperty$1 = /*@__PURE__*/getDefaultExportFromCjs(definePropertyExports$1);

var es_array_concat = {};

var doesNotExceedSafeInteger;
var hasRequiredDoesNotExceedSafeInteger;

function requireDoesNotExceedSafeInteger () {
	if (hasRequiredDoesNotExceedSafeInteger) return doesNotExceedSafeInteger;
	hasRequiredDoesNotExceedSafeInteger = 1;
	var $TypeError = TypeError;
	var MAX_SAFE_INTEGER = 0x1FFFFFFFFFFFFF; // 2 ** 53 - 1 == 9007199254740991

	doesNotExceedSafeInteger = function (it) {
	  if (it > MAX_SAFE_INTEGER) throw $TypeError('Maximum allowed index exceeded');
	  return it;
	};
	return doesNotExceedSafeInteger;
}

var hasRequiredEs_array_concat;

function requireEs_array_concat () {
	if (hasRequiredEs_array_concat) return es_array_concat;
	hasRequiredEs_array_concat = 1;
	var $ = /*@__PURE__*/ require_export();
	var fails = /*@__PURE__*/ requireFails();
	var isArray = /*@__PURE__*/ requireIsArray$3();
	var isObject = /*@__PURE__*/ requireIsObject();
	var toObject = /*@__PURE__*/ requireToObject();
	var lengthOfArrayLike = /*@__PURE__*/ requireLengthOfArrayLike();
	var doesNotExceedSafeInteger = /*@__PURE__*/ requireDoesNotExceedSafeInteger();
	var createProperty = /*@__PURE__*/ requireCreateProperty();
	var arraySpeciesCreate = /*@__PURE__*/ requireArraySpeciesCreate();
	var arrayMethodHasSpeciesSupport = /*@__PURE__*/ requireArrayMethodHasSpeciesSupport();
	var wellKnownSymbol = /*@__PURE__*/ requireWellKnownSymbol();
	var V8_VERSION = /*@__PURE__*/ requireEnvironmentV8Version();

	var IS_CONCAT_SPREADABLE = wellKnownSymbol('isConcatSpreadable');

	// We can't use this feature detection in V8 since it causes
	// deoptimization and serious performance degradation
	// https://github.com/zloirock/core-js/issues/679
	var IS_CONCAT_SPREADABLE_SUPPORT = V8_VERSION >= 51 || !fails(function () {
	  var array = [];
	  array[IS_CONCAT_SPREADABLE] = false;
	  return array.concat()[0] !== array;
	});

	var isConcatSpreadable = function (O) {
	  if (!isObject(O)) return false;
	  var spreadable = O[IS_CONCAT_SPREADABLE];
	  return spreadable !== undefined ? !!spreadable : isArray(O);
	};

	var FORCED = !IS_CONCAT_SPREADABLE_SUPPORT || !arrayMethodHasSpeciesSupport('concat');

	// `Array.prototype.concat` method
	// https://tc39.es/ecma262/#sec-array.prototype.concat
	// with adding support of @@isConcatSpreadable and @@species
	$({ target: 'Array', proto: true, arity: 1, forced: FORCED }, {
	  // eslint-disable-next-line no-unused-vars -- required for `.length`
	  concat: function concat(arg) {
	    var O = toObject(this);
	    var A = arraySpeciesCreate(O, 0);
	    var n = 0;
	    var i, k, length, len, E;
	    for (i = -1, length = arguments.length; i < length; i++) {
	      E = i === -1 ? O : arguments[i];
	      if (isConcatSpreadable(E)) {
	        len = lengthOfArrayLike(E);
	        doesNotExceedSafeInteger(n + len);
	        for (k = 0; k < len; k++, n++) if (k in E) createProperty(A, n, E[k]);
	      } else {
	        doesNotExceedSafeInteger(n + 1);
	        createProperty(A, n++, E);
	      }
	    }
	    A.length = n;
	    return A;
	  }
	});
	return es_array_concat;
}

var es_symbol_asyncDispose = {};

var hasRequiredEs_symbol_asyncDispose;

function requireEs_symbol_asyncDispose () {
	if (hasRequiredEs_symbol_asyncDispose) return es_symbol_asyncDispose;
	hasRequiredEs_symbol_asyncDispose = 1;
	var defineWellKnownSymbol = /*@__PURE__*/ requireWellKnownSymbolDefine();

	// `Symbol.asyncDispose` well-known symbol
	// https://github.com/tc39/proposal-async-explicit-resource-management
	defineWellKnownSymbol('asyncDispose');
	return es_symbol_asyncDispose;
}

var es_symbol_asyncIterator = {};

var hasRequiredEs_symbol_asyncIterator;

function requireEs_symbol_asyncIterator () {
	if (hasRequiredEs_symbol_asyncIterator) return es_symbol_asyncIterator;
	hasRequiredEs_symbol_asyncIterator = 1;
	var defineWellKnownSymbol = /*@__PURE__*/ requireWellKnownSymbolDefine();

	// `Symbol.asyncIterator` well-known symbol
	// https://tc39.es/ecma262/#sec-symbol.asynciterator
	defineWellKnownSymbol('asyncIterator');
	return es_symbol_asyncIterator;
}

var es_symbol_dispose = {};

var hasRequiredEs_symbol_dispose;

function requireEs_symbol_dispose () {
	if (hasRequiredEs_symbol_dispose) return es_symbol_dispose;
	hasRequiredEs_symbol_dispose = 1;
	var defineWellKnownSymbol = /*@__PURE__*/ requireWellKnownSymbolDefine();

	// `Symbol.dispose` well-known symbol
	// https://github.com/tc39/proposal-explicit-resource-management
	defineWellKnownSymbol('dispose');
	return es_symbol_dispose;
}

var es_symbol_hasInstance = {};

var hasRequiredEs_symbol_hasInstance;

function requireEs_symbol_hasInstance () {
	if (hasRequiredEs_symbol_hasInstance) return es_symbol_hasInstance;
	hasRequiredEs_symbol_hasInstance = 1;
	var defineWellKnownSymbol = /*@__PURE__*/ requireWellKnownSymbolDefine();

	// `Symbol.hasInstance` well-known symbol
	// https://tc39.es/ecma262/#sec-symbol.hasinstance
	defineWellKnownSymbol('hasInstance');
	return es_symbol_hasInstance;
}

var es_symbol_isConcatSpreadable = {};

var hasRequiredEs_symbol_isConcatSpreadable;

function requireEs_symbol_isConcatSpreadable () {
	if (hasRequiredEs_symbol_isConcatSpreadable) return es_symbol_isConcatSpreadable;
	hasRequiredEs_symbol_isConcatSpreadable = 1;
	var defineWellKnownSymbol = /*@__PURE__*/ requireWellKnownSymbolDefine();

	// `Symbol.isConcatSpreadable` well-known symbol
	// https://tc39.es/ecma262/#sec-symbol.isconcatspreadable
	defineWellKnownSymbol('isConcatSpreadable');
	return es_symbol_isConcatSpreadable;
}

var es_symbol_iterator = {};

var hasRequiredEs_symbol_iterator;

function requireEs_symbol_iterator () {
	if (hasRequiredEs_symbol_iterator) return es_symbol_iterator;
	hasRequiredEs_symbol_iterator = 1;
	var defineWellKnownSymbol = /*@__PURE__*/ requireWellKnownSymbolDefine();

	// `Symbol.iterator` well-known symbol
	// https://tc39.es/ecma262/#sec-symbol.iterator
	defineWellKnownSymbol('iterator');
	return es_symbol_iterator;
}

var es_symbol_match = {};

var hasRequiredEs_symbol_match;

function requireEs_symbol_match () {
	if (hasRequiredEs_symbol_match) return es_symbol_match;
	hasRequiredEs_symbol_match = 1;
	var defineWellKnownSymbol = /*@__PURE__*/ requireWellKnownSymbolDefine();

	// `Symbol.match` well-known symbol
	// https://tc39.es/ecma262/#sec-symbol.match
	defineWellKnownSymbol('match');
	return es_symbol_match;
}

var es_symbol_matchAll = {};

var hasRequiredEs_symbol_matchAll;

function requireEs_symbol_matchAll () {
	if (hasRequiredEs_symbol_matchAll) return es_symbol_matchAll;
	hasRequiredEs_symbol_matchAll = 1;
	var defineWellKnownSymbol = /*@__PURE__*/ requireWellKnownSymbolDefine();

	// `Symbol.matchAll` well-known symbol
	// https://tc39.es/ecma262/#sec-symbol.matchall
	defineWellKnownSymbol('matchAll');
	return es_symbol_matchAll;
}

var es_symbol_replace = {};

var hasRequiredEs_symbol_replace;

function requireEs_symbol_replace () {
	if (hasRequiredEs_symbol_replace) return es_symbol_replace;
	hasRequiredEs_symbol_replace = 1;
	var defineWellKnownSymbol = /*@__PURE__*/ requireWellKnownSymbolDefine();

	// `Symbol.replace` well-known symbol
	// https://tc39.es/ecma262/#sec-symbol.replace
	defineWellKnownSymbol('replace');
	return es_symbol_replace;
}

var es_symbol_search = {};

var hasRequiredEs_symbol_search;

function requireEs_symbol_search () {
	if (hasRequiredEs_symbol_search) return es_symbol_search;
	hasRequiredEs_symbol_search = 1;
	var defineWellKnownSymbol = /*@__PURE__*/ requireWellKnownSymbolDefine();

	// `Symbol.search` well-known symbol
	// https://tc39.es/ecma262/#sec-symbol.search
	defineWellKnownSymbol('search');
	return es_symbol_search;
}

var es_symbol_species = {};

var hasRequiredEs_symbol_species;

function requireEs_symbol_species () {
	if (hasRequiredEs_symbol_species) return es_symbol_species;
	hasRequiredEs_symbol_species = 1;
	var defineWellKnownSymbol = /*@__PURE__*/ requireWellKnownSymbolDefine();

	// `Symbol.species` well-known symbol
	// https://tc39.es/ecma262/#sec-symbol.species
	defineWellKnownSymbol('species');
	return es_symbol_species;
}

var es_symbol_split = {};

var hasRequiredEs_symbol_split;

function requireEs_symbol_split () {
	if (hasRequiredEs_symbol_split) return es_symbol_split;
	hasRequiredEs_symbol_split = 1;
	var defineWellKnownSymbol = /*@__PURE__*/ requireWellKnownSymbolDefine();

	// `Symbol.split` well-known symbol
	// https://tc39.es/ecma262/#sec-symbol.split
	defineWellKnownSymbol('split');
	return es_symbol_split;
}

var es_symbol_toPrimitive = {};

var hasRequiredEs_symbol_toPrimitive;

function requireEs_symbol_toPrimitive () {
	if (hasRequiredEs_symbol_toPrimitive) return es_symbol_toPrimitive;
	hasRequiredEs_symbol_toPrimitive = 1;
	var defineWellKnownSymbol = /*@__PURE__*/ requireWellKnownSymbolDefine();
	var defineSymbolToPrimitive = /*@__PURE__*/ requireSymbolDefineToPrimitive();

	// `Symbol.toPrimitive` well-known symbol
	// https://tc39.es/ecma262/#sec-symbol.toprimitive
	defineWellKnownSymbol('toPrimitive');

	// `Symbol.prototype[@@toPrimitive]` method
	// https://tc39.es/ecma262/#sec-symbol.prototype-@@toprimitive
	defineSymbolToPrimitive();
	return es_symbol_toPrimitive;
}

var es_symbol_toStringTag = {};

var hasRequiredEs_symbol_toStringTag;

function requireEs_symbol_toStringTag () {
	if (hasRequiredEs_symbol_toStringTag) return es_symbol_toStringTag;
	hasRequiredEs_symbol_toStringTag = 1;
	var getBuiltIn = /*@__PURE__*/ requireGetBuiltIn();
	var defineWellKnownSymbol = /*@__PURE__*/ requireWellKnownSymbolDefine();
	var setToStringTag = /*@__PURE__*/ requireSetToStringTag();

	// `Symbol.toStringTag` well-known symbol
	// https://tc39.es/ecma262/#sec-symbol.tostringtag
	defineWellKnownSymbol('toStringTag');

	// `Symbol.prototype[@@toStringTag]` property
	// https://tc39.es/ecma262/#sec-symbol.prototype-@@tostringtag
	setToStringTag(getBuiltIn('Symbol'), 'Symbol');
	return es_symbol_toStringTag;
}

var es_symbol_unscopables = {};

var hasRequiredEs_symbol_unscopables;

function requireEs_symbol_unscopables () {
	if (hasRequiredEs_symbol_unscopables) return es_symbol_unscopables;
	hasRequiredEs_symbol_unscopables = 1;
	var defineWellKnownSymbol = /*@__PURE__*/ requireWellKnownSymbolDefine();

	// `Symbol.unscopables` well-known symbol
	// https://tc39.es/ecma262/#sec-symbol.unscopables
	defineWellKnownSymbol('unscopables');
	return es_symbol_unscopables;
}

var es_json_toStringTag = {};

var hasRequiredEs_json_toStringTag;

function requireEs_json_toStringTag () {
	if (hasRequiredEs_json_toStringTag) return es_json_toStringTag;
	hasRequiredEs_json_toStringTag = 1;
	var globalThis = /*@__PURE__*/ requireGlobalThis();
	var setToStringTag = /*@__PURE__*/ requireSetToStringTag();

	// JSON[@@toStringTag] property
	// https://tc39.es/ecma262/#sec-json-@@tostringtag
	setToStringTag(globalThis.JSON, 'JSON', true);
	return es_json_toStringTag;
}

var symbol$5;
var hasRequiredSymbol$5;

function requireSymbol$5 () {
	if (hasRequiredSymbol$5) return symbol$5;
	hasRequiredSymbol$5 = 1;
	requireEs_array_concat();
	requireEs_symbol();
	requireEs_symbol_asyncDispose();
	requireEs_symbol_asyncIterator();
	requireEs_symbol_dispose();
	requireEs_symbol_hasInstance();
	requireEs_symbol_isConcatSpreadable();
	requireEs_symbol_iterator();
	requireEs_symbol_match();
	requireEs_symbol_matchAll();
	requireEs_symbol_replace();
	requireEs_symbol_search();
	requireEs_symbol_species();
	requireEs_symbol_split();
	requireEs_symbol_toPrimitive();
	requireEs_symbol_toStringTag();
	requireEs_symbol_unscopables();
	requireEs_json_toStringTag();
	var path = /*@__PURE__*/ requirePath();

	symbol$5 = path.Symbol;
	return symbol$5;
}

var web_domCollections_iterator = {};

var addToUnscopables;
var hasRequiredAddToUnscopables;

function requireAddToUnscopables () {
	if (hasRequiredAddToUnscopables) return addToUnscopables;
	hasRequiredAddToUnscopables = 1;
	addToUnscopables = function () { /* empty */ };
	return addToUnscopables;
}

var iterators;
var hasRequiredIterators;

function requireIterators () {
	if (hasRequiredIterators) return iterators;
	hasRequiredIterators = 1;
	iterators = {};
	return iterators;
}

var functionName;
var hasRequiredFunctionName;

function requireFunctionName () {
	if (hasRequiredFunctionName) return functionName;
	hasRequiredFunctionName = 1;
	var DESCRIPTORS = /*@__PURE__*/ requireDescriptors();
	var hasOwn = /*@__PURE__*/ requireHasOwnProperty();

	var FunctionPrototype = Function.prototype;
	// eslint-disable-next-line es/no-object-getownpropertydescriptor -- safe
	var getDescriptor = DESCRIPTORS && Object.getOwnPropertyDescriptor;

	var EXISTS = hasOwn(FunctionPrototype, 'name');
	// additional protection from minified / mangled / dropped function names
	var PROPER = EXISTS && (function something() { /* empty */ }).name === 'something';
	var CONFIGURABLE = EXISTS && (!DESCRIPTORS || (DESCRIPTORS && getDescriptor(FunctionPrototype, 'name').configurable));

	functionName = {
	  EXISTS: EXISTS,
	  PROPER: PROPER,
	  CONFIGURABLE: CONFIGURABLE
	};
	return functionName;
}

var correctPrototypeGetter;
var hasRequiredCorrectPrototypeGetter;

function requireCorrectPrototypeGetter () {
	if (hasRequiredCorrectPrototypeGetter) return correctPrototypeGetter;
	hasRequiredCorrectPrototypeGetter = 1;
	var fails = /*@__PURE__*/ requireFails();

	correctPrototypeGetter = !fails(function () {
	  function F() { /* empty */ }
	  F.prototype.constructor = null;
	  // eslint-disable-next-line es/no-object-getprototypeof -- required for testing
	  return Object.getPrototypeOf(new F()) !== F.prototype;
	});
	return correctPrototypeGetter;
}

var objectGetPrototypeOf;
var hasRequiredObjectGetPrototypeOf;

function requireObjectGetPrototypeOf () {
	if (hasRequiredObjectGetPrototypeOf) return objectGetPrototypeOf;
	hasRequiredObjectGetPrototypeOf = 1;
	var hasOwn = /*@__PURE__*/ requireHasOwnProperty();
	var isCallable = /*@__PURE__*/ requireIsCallable();
	var toObject = /*@__PURE__*/ requireToObject();
	var sharedKey = /*@__PURE__*/ requireSharedKey();
	var CORRECT_PROTOTYPE_GETTER = /*@__PURE__*/ requireCorrectPrototypeGetter();

	var IE_PROTO = sharedKey('IE_PROTO');
	var $Object = Object;
	var ObjectPrototype = $Object.prototype;

	// `Object.getPrototypeOf` method
	// https://tc39.es/ecma262/#sec-object.getprototypeof
	// eslint-disable-next-line es/no-object-getprototypeof -- safe
	objectGetPrototypeOf = CORRECT_PROTOTYPE_GETTER ? $Object.getPrototypeOf : function (O) {
	  var object = toObject(O);
	  if (hasOwn(object, IE_PROTO)) return object[IE_PROTO];
	  var constructor = object.constructor;
	  if (isCallable(constructor) && object instanceof constructor) {
	    return constructor.prototype;
	  } return object instanceof $Object ? ObjectPrototype : null;
	};
	return objectGetPrototypeOf;
}

var iteratorsCore;
var hasRequiredIteratorsCore;

function requireIteratorsCore () {
	if (hasRequiredIteratorsCore) return iteratorsCore;
	hasRequiredIteratorsCore = 1;
	var fails = /*@__PURE__*/ requireFails();
	var isCallable = /*@__PURE__*/ requireIsCallable();
	var isObject = /*@__PURE__*/ requireIsObject();
	var create = /*@__PURE__*/ requireObjectCreate();
	var getPrototypeOf = /*@__PURE__*/ requireObjectGetPrototypeOf();
	var defineBuiltIn = /*@__PURE__*/ requireDefineBuiltIn();
	var wellKnownSymbol = /*@__PURE__*/ requireWellKnownSymbol();
	var IS_PURE = /*@__PURE__*/ requireIsPure();

	var ITERATOR = wellKnownSymbol('iterator');
	var BUGGY_SAFARI_ITERATORS = false;

	// `%IteratorPrototype%` object
	// https://tc39.es/ecma262/#sec-%iteratorprototype%-object
	var IteratorPrototype, PrototypeOfArrayIteratorPrototype, arrayIterator;

	/* eslint-disable es/no-array-prototype-keys -- safe */
	if ([].keys) {
	  arrayIterator = [].keys();
	  // Safari 8 has buggy iterators w/o `next`
	  if (!('next' in arrayIterator)) BUGGY_SAFARI_ITERATORS = true;
	  else {
	    PrototypeOfArrayIteratorPrototype = getPrototypeOf(getPrototypeOf(arrayIterator));
	    if (PrototypeOfArrayIteratorPrototype !== Object.prototype) IteratorPrototype = PrototypeOfArrayIteratorPrototype;
	  }
	}

	var NEW_ITERATOR_PROTOTYPE = !isObject(IteratorPrototype) || fails(function () {
	  var test = {};
	  // FF44- legacy iterators case
	  return IteratorPrototype[ITERATOR].call(test) !== test;
	});

	if (NEW_ITERATOR_PROTOTYPE) IteratorPrototype = {};
	else if (IS_PURE) IteratorPrototype = create(IteratorPrototype);

	// `%IteratorPrototype%[@@iterator]()` method
	// https://tc39.es/ecma262/#sec-%iteratorprototype%-@@iterator
	if (!isCallable(IteratorPrototype[ITERATOR])) {
	  defineBuiltIn(IteratorPrototype, ITERATOR, function () {
	    return this;
	  });
	}

	iteratorsCore = {
	  IteratorPrototype: IteratorPrototype,
	  BUGGY_SAFARI_ITERATORS: BUGGY_SAFARI_ITERATORS
	};
	return iteratorsCore;
}

var iteratorCreateConstructor;
var hasRequiredIteratorCreateConstructor;

function requireIteratorCreateConstructor () {
	if (hasRequiredIteratorCreateConstructor) return iteratorCreateConstructor;
	hasRequiredIteratorCreateConstructor = 1;
	var IteratorPrototype = /*@__PURE__*/ requireIteratorsCore().IteratorPrototype;
	var create = /*@__PURE__*/ requireObjectCreate();
	var createPropertyDescriptor = /*@__PURE__*/ requireCreatePropertyDescriptor();
	var setToStringTag = /*@__PURE__*/ requireSetToStringTag();
	var Iterators = /*@__PURE__*/ requireIterators();

	var returnThis = function () { return this; };

	iteratorCreateConstructor = function (IteratorConstructor, NAME, next, ENUMERABLE_NEXT) {
	  var TO_STRING_TAG = NAME + ' Iterator';
	  IteratorConstructor.prototype = create(IteratorPrototype, { next: createPropertyDescriptor(+!ENUMERABLE_NEXT, next) });
	  setToStringTag(IteratorConstructor, TO_STRING_TAG, false, true);
	  Iterators[TO_STRING_TAG] = returnThis;
	  return IteratorConstructor;
	};
	return iteratorCreateConstructor;
}

var functionUncurryThisAccessor;
var hasRequiredFunctionUncurryThisAccessor;

function requireFunctionUncurryThisAccessor () {
	if (hasRequiredFunctionUncurryThisAccessor) return functionUncurryThisAccessor;
	hasRequiredFunctionUncurryThisAccessor = 1;
	var uncurryThis = /*@__PURE__*/ requireFunctionUncurryThis();
	var aCallable = /*@__PURE__*/ requireACallable();

	functionUncurryThisAccessor = function (object, key, method) {
	  try {
	    // eslint-disable-next-line es/no-object-getownpropertydescriptor -- safe
	    return uncurryThis(aCallable(Object.getOwnPropertyDescriptor(object, key)[method]));
	  } catch (error) { /* empty */ }
	};
	return functionUncurryThisAccessor;
}

var isPossiblePrototype;
var hasRequiredIsPossiblePrototype;

function requireIsPossiblePrototype () {
	if (hasRequiredIsPossiblePrototype) return isPossiblePrototype;
	hasRequiredIsPossiblePrototype = 1;
	var isObject = /*@__PURE__*/ requireIsObject();

	isPossiblePrototype = function (argument) {
	  return isObject(argument) || argument === null;
	};
	return isPossiblePrototype;
}

var aPossiblePrototype;
var hasRequiredAPossiblePrototype;

function requireAPossiblePrototype () {
	if (hasRequiredAPossiblePrototype) return aPossiblePrototype;
	hasRequiredAPossiblePrototype = 1;
	var isPossiblePrototype = /*@__PURE__*/ requireIsPossiblePrototype();

	var $String = String;
	var $TypeError = TypeError;

	aPossiblePrototype = function (argument) {
	  if (isPossiblePrototype(argument)) return argument;
	  throw new $TypeError("Can't set " + $String(argument) + ' as a prototype');
	};
	return aPossiblePrototype;
}

var objectSetPrototypeOf;
var hasRequiredObjectSetPrototypeOf;

function requireObjectSetPrototypeOf () {
	if (hasRequiredObjectSetPrototypeOf) return objectSetPrototypeOf;
	hasRequiredObjectSetPrototypeOf = 1;
	/* eslint-disable no-proto -- safe */
	var uncurryThisAccessor = /*@__PURE__*/ requireFunctionUncurryThisAccessor();
	var isObject = /*@__PURE__*/ requireIsObject();
	var requireObjectCoercible = /*@__PURE__*/ requireRequireObjectCoercible();
	var aPossiblePrototype = /*@__PURE__*/ requireAPossiblePrototype();

	// `Object.setPrototypeOf` method
	// https://tc39.es/ecma262/#sec-object.setprototypeof
	// Works with __proto__ only. Old v8 can't work with null proto objects.
	// eslint-disable-next-line es/no-object-setprototypeof -- safe
	objectSetPrototypeOf = Object.setPrototypeOf || ('__proto__' in {} ? function () {
	  var CORRECT_SETTER = false;
	  var test = {};
	  var setter;
	  try {
	    setter = uncurryThisAccessor(Object.prototype, '__proto__', 'set');
	    setter(test, []);
	    CORRECT_SETTER = test instanceof Array;
	  } catch (error) { /* empty */ }
	  return function setPrototypeOf(O, proto) {
	    requireObjectCoercible(O);
	    aPossiblePrototype(proto);
	    if (!isObject(O)) return O;
	    if (CORRECT_SETTER) setter(O, proto);
	    else O.__proto__ = proto;
	    return O;
	  };
	}() : undefined);
	return objectSetPrototypeOf;
}

var iteratorDefine;
var hasRequiredIteratorDefine;

function requireIteratorDefine () {
	if (hasRequiredIteratorDefine) return iteratorDefine;
	hasRequiredIteratorDefine = 1;
	var $ = /*@__PURE__*/ require_export();
	var call = /*@__PURE__*/ requireFunctionCall();
	var IS_PURE = /*@__PURE__*/ requireIsPure();
	var FunctionName = /*@__PURE__*/ requireFunctionName();
	var isCallable = /*@__PURE__*/ requireIsCallable();
	var createIteratorConstructor = /*@__PURE__*/ requireIteratorCreateConstructor();
	var getPrototypeOf = /*@__PURE__*/ requireObjectGetPrototypeOf();
	var setPrototypeOf = /*@__PURE__*/ requireObjectSetPrototypeOf();
	var setToStringTag = /*@__PURE__*/ requireSetToStringTag();
	var createNonEnumerableProperty = /*@__PURE__*/ requireCreateNonEnumerableProperty();
	var defineBuiltIn = /*@__PURE__*/ requireDefineBuiltIn();
	var wellKnownSymbol = /*@__PURE__*/ requireWellKnownSymbol();
	var Iterators = /*@__PURE__*/ requireIterators();
	var IteratorsCore = /*@__PURE__*/ requireIteratorsCore();

	var PROPER_FUNCTION_NAME = FunctionName.PROPER;
	var CONFIGURABLE_FUNCTION_NAME = FunctionName.CONFIGURABLE;
	var IteratorPrototype = IteratorsCore.IteratorPrototype;
	var BUGGY_SAFARI_ITERATORS = IteratorsCore.BUGGY_SAFARI_ITERATORS;
	var ITERATOR = wellKnownSymbol('iterator');
	var KEYS = 'keys';
	var VALUES = 'values';
	var ENTRIES = 'entries';

	var returnThis = function () { return this; };

	iteratorDefine = function (Iterable, NAME, IteratorConstructor, next, DEFAULT, IS_SET, FORCED) {
	  createIteratorConstructor(IteratorConstructor, NAME, next);

	  var getIterationMethod = function (KIND) {
	    if (KIND === DEFAULT && defaultIterator) return defaultIterator;
	    if (!BUGGY_SAFARI_ITERATORS && KIND && KIND in IterablePrototype) return IterablePrototype[KIND];

	    switch (KIND) {
	      case KEYS: return function keys() { return new IteratorConstructor(this, KIND); };
	      case VALUES: return function values() { return new IteratorConstructor(this, KIND); };
	      case ENTRIES: return function entries() { return new IteratorConstructor(this, KIND); };
	    }

	    return function () { return new IteratorConstructor(this); };
	  };

	  var TO_STRING_TAG = NAME + ' Iterator';
	  var INCORRECT_VALUES_NAME = false;
	  var IterablePrototype = Iterable.prototype;
	  var nativeIterator = IterablePrototype[ITERATOR]
	    || IterablePrototype['@@iterator']
	    || DEFAULT && IterablePrototype[DEFAULT];
	  var defaultIterator = !BUGGY_SAFARI_ITERATORS && nativeIterator || getIterationMethod(DEFAULT);
	  var anyNativeIterator = NAME === 'Array' ? IterablePrototype.entries || nativeIterator : nativeIterator;
	  var CurrentIteratorPrototype, methods, KEY;

	  // fix native
	  if (anyNativeIterator) {
	    CurrentIteratorPrototype = getPrototypeOf(anyNativeIterator.call(new Iterable()));
	    if (CurrentIteratorPrototype !== Object.prototype && CurrentIteratorPrototype.next) {
	      if (!IS_PURE && getPrototypeOf(CurrentIteratorPrototype) !== IteratorPrototype) {
	        if (setPrototypeOf) {
	          setPrototypeOf(CurrentIteratorPrototype, IteratorPrototype);
	        } else if (!isCallable(CurrentIteratorPrototype[ITERATOR])) {
	          defineBuiltIn(CurrentIteratorPrototype, ITERATOR, returnThis);
	        }
	      }
	      // Set @@toStringTag to native iterators
	      setToStringTag(CurrentIteratorPrototype, TO_STRING_TAG, true, true);
	      if (IS_PURE) Iterators[TO_STRING_TAG] = returnThis;
	    }
	  }

	  // fix Array.prototype.{ values, @@iterator }.name in V8 / FF
	  if (PROPER_FUNCTION_NAME && DEFAULT === VALUES && nativeIterator && nativeIterator.name !== VALUES) {
	    if (!IS_PURE && CONFIGURABLE_FUNCTION_NAME) {
	      createNonEnumerableProperty(IterablePrototype, 'name', VALUES);
	    } else {
	      INCORRECT_VALUES_NAME = true;
	      defaultIterator = function values() { return call(nativeIterator, this); };
	    }
	  }

	  // export additional methods
	  if (DEFAULT) {
	    methods = {
	      values: getIterationMethod(VALUES),
	      keys: IS_SET ? defaultIterator : getIterationMethod(KEYS),
	      entries: getIterationMethod(ENTRIES)
	    };
	    if (FORCED) for (KEY in methods) {
	      if (BUGGY_SAFARI_ITERATORS || INCORRECT_VALUES_NAME || !(KEY in IterablePrototype)) {
	        defineBuiltIn(IterablePrototype, KEY, methods[KEY]);
	      }
	    } else $({ target: NAME, proto: true, forced: BUGGY_SAFARI_ITERATORS || INCORRECT_VALUES_NAME }, methods);
	  }

	  // define iterator
	  if ((!IS_PURE || FORCED) && IterablePrototype[ITERATOR] !== defaultIterator) {
	    defineBuiltIn(IterablePrototype, ITERATOR, defaultIterator, { name: DEFAULT });
	  }
	  Iterators[NAME] = defaultIterator;

	  return methods;
	};
	return iteratorDefine;
}

var createIterResultObject;
var hasRequiredCreateIterResultObject;

function requireCreateIterResultObject () {
	if (hasRequiredCreateIterResultObject) return createIterResultObject;
	hasRequiredCreateIterResultObject = 1;
	// `CreateIterResultObject` abstract operation
	// https://tc39.es/ecma262/#sec-createiterresultobject
	createIterResultObject = function (value, done) {
	  return { value: value, done: done };
	};
	return createIterResultObject;
}

var es_array_iterator;
var hasRequiredEs_array_iterator;

function requireEs_array_iterator () {
	if (hasRequiredEs_array_iterator) return es_array_iterator;
	hasRequiredEs_array_iterator = 1;
	var toIndexedObject = /*@__PURE__*/ requireToIndexedObject();
	var addToUnscopables = /*@__PURE__*/ requireAddToUnscopables();
	var Iterators = /*@__PURE__*/ requireIterators();
	var InternalStateModule = /*@__PURE__*/ requireInternalState();
	var defineProperty = /*@__PURE__*/ requireObjectDefineProperty().f;
	var defineIterator = /*@__PURE__*/ requireIteratorDefine();
	var createIterResultObject = /*@__PURE__*/ requireCreateIterResultObject();
	var IS_PURE = /*@__PURE__*/ requireIsPure();
	var DESCRIPTORS = /*@__PURE__*/ requireDescriptors();

	var ARRAY_ITERATOR = 'Array Iterator';
	var setInternalState = InternalStateModule.set;
	var getInternalState = InternalStateModule.getterFor(ARRAY_ITERATOR);

	// `Array.prototype.entries` method
	// https://tc39.es/ecma262/#sec-array.prototype.entries
	// `Array.prototype.keys` method
	// https://tc39.es/ecma262/#sec-array.prototype.keys
	// `Array.prototype.values` method
	// https://tc39.es/ecma262/#sec-array.prototype.values
	// `Array.prototype[@@iterator]` method
	// https://tc39.es/ecma262/#sec-array.prototype-@@iterator
	// `CreateArrayIterator` internal method
	// https://tc39.es/ecma262/#sec-createarrayiterator
	es_array_iterator = defineIterator(Array, 'Array', function (iterated, kind) {
	  setInternalState(this, {
	    type: ARRAY_ITERATOR,
	    target: toIndexedObject(iterated), // target
	    index: 0,                          // next index
	    kind: kind                         // kind
	  });
	// `%ArrayIteratorPrototype%.next` method
	// https://tc39.es/ecma262/#sec-%arrayiteratorprototype%.next
	}, function () {
	  var state = getInternalState(this);
	  var target = state.target;
	  var index = state.index++;
	  if (!target || index >= target.length) {
	    state.target = null;
	    return createIterResultObject(undefined, true);
	  }
	  switch (state.kind) {
	    case 'keys': return createIterResultObject(index, false);
	    case 'values': return createIterResultObject(target[index], false);
	  } return createIterResultObject([index, target[index]], false);
	}, 'values');

	// argumentsList[@@iterator] is %ArrayProto_values%
	// https://tc39.es/ecma262/#sec-createunmappedargumentsobject
	// https://tc39.es/ecma262/#sec-createmappedargumentsobject
	var values = Iterators.Arguments = Iterators.Array;

	// https://tc39.es/ecma262/#sec-array.prototype-@@unscopables
	addToUnscopables('keys');
	addToUnscopables('values');
	addToUnscopables('entries');

	// V8 ~ Chrome 45- bug
	if (!IS_PURE && DESCRIPTORS && values.name !== 'values') try {
	  defineProperty(values, 'name', { value: 'values' });
	} catch (error) { /* empty */ }
	return es_array_iterator;
}

var domIterables;
var hasRequiredDomIterables;

function requireDomIterables () {
	if (hasRequiredDomIterables) return domIterables;
	hasRequiredDomIterables = 1;
	// iterable DOM collections
	// flag - `iterable` interface - 'entries', 'keys', 'values', 'forEach' methods
	domIterables = {
	  CSSRuleList: 0,
	  CSSStyleDeclaration: 0,
	  CSSValueList: 0,
	  ClientRectList: 0,
	  DOMRectList: 0,
	  DOMStringList: 0,
	  DOMTokenList: 1,
	  DataTransferItemList: 0,
	  FileList: 0,
	  HTMLAllCollection: 0,
	  HTMLCollection: 0,
	  HTMLFormElement: 0,
	  HTMLSelectElement: 0,
	  MediaList: 0,
	  MimeTypeArray: 0,
	  NamedNodeMap: 0,
	  NodeList: 1,
	  PaintRequestList: 0,
	  Plugin: 0,
	  PluginArray: 0,
	  SVGLengthList: 0,
	  SVGNumberList: 0,
	  SVGPathSegList: 0,
	  SVGPointList: 0,
	  SVGStringList: 0,
	  SVGTransformList: 0,
	  SourceBufferList: 0,
	  StyleSheetList: 0,
	  TextTrackCueList: 0,
	  TextTrackList: 0,
	  TouchList: 0
	};
	return domIterables;
}

var hasRequiredWeb_domCollections_iterator;

function requireWeb_domCollections_iterator () {
	if (hasRequiredWeb_domCollections_iterator) return web_domCollections_iterator;
	hasRequiredWeb_domCollections_iterator = 1;
	requireEs_array_iterator();
	var DOMIterables = /*@__PURE__*/ requireDomIterables();
	var globalThis = /*@__PURE__*/ requireGlobalThis();
	var setToStringTag = /*@__PURE__*/ requireSetToStringTag();
	var Iterators = /*@__PURE__*/ requireIterators();

	for (var COLLECTION_NAME in DOMIterables) {
	  setToStringTag(globalThis[COLLECTION_NAME], COLLECTION_NAME);
	  Iterators[COLLECTION_NAME] = Iterators.Array;
	}
	return web_domCollections_iterator;
}

var symbol$4;
var hasRequiredSymbol$4;

function requireSymbol$4 () {
	if (hasRequiredSymbol$4) return symbol$4;
	hasRequiredSymbol$4 = 1;
	var parent = /*@__PURE__*/ requireSymbol$5();
	requireWeb_domCollections_iterator();

	symbol$4 = parent;
	return symbol$4;
}

var esnext_function_metadata = {};

var hasRequiredEsnext_function_metadata;

function requireEsnext_function_metadata () {
	if (hasRequiredEsnext_function_metadata) return esnext_function_metadata;
	hasRequiredEsnext_function_metadata = 1;
	var wellKnownSymbol = /*@__PURE__*/ requireWellKnownSymbol();
	var defineProperty = /*@__PURE__*/ requireObjectDefineProperty().f;

	var METADATA = wellKnownSymbol('metadata');
	var FunctionPrototype = Function.prototype;

	// Function.prototype[@@metadata]
	// https://github.com/tc39/proposal-decorator-metadata
	if (FunctionPrototype[METADATA] === undefined) {
	  defineProperty(FunctionPrototype, METADATA, {
	    value: null
	  });
	}
	return esnext_function_metadata;
}

var esnext_symbol_asyncDispose = {};

var hasRequiredEsnext_symbol_asyncDispose;

function requireEsnext_symbol_asyncDispose () {
	if (hasRequiredEsnext_symbol_asyncDispose) return esnext_symbol_asyncDispose;
	hasRequiredEsnext_symbol_asyncDispose = 1;
	// TODO: Remove from `core-js@4`
	requireEs_symbol_asyncDispose();
	return esnext_symbol_asyncDispose;
}

var esnext_symbol_dispose = {};

var hasRequiredEsnext_symbol_dispose;

function requireEsnext_symbol_dispose () {
	if (hasRequiredEsnext_symbol_dispose) return esnext_symbol_dispose;
	hasRequiredEsnext_symbol_dispose = 1;
	// TODO: Remove from `core-js@4`
	requireEs_symbol_dispose();
	return esnext_symbol_dispose;
}

var esnext_symbol_metadata = {};

var hasRequiredEsnext_symbol_metadata;

function requireEsnext_symbol_metadata () {
	if (hasRequiredEsnext_symbol_metadata) return esnext_symbol_metadata;
	hasRequiredEsnext_symbol_metadata = 1;
	var defineWellKnownSymbol = /*@__PURE__*/ requireWellKnownSymbolDefine();

	// `Symbol.metadata` well-known symbol
	// https://github.com/tc39/proposal-decorators
	defineWellKnownSymbol('metadata');
	return esnext_symbol_metadata;
}

var symbol$3;
var hasRequiredSymbol$3;

function requireSymbol$3 () {
	if (hasRequiredSymbol$3) return symbol$3;
	hasRequiredSymbol$3 = 1;
	var parent = /*@__PURE__*/ requireSymbol$4();

	requireEsnext_function_metadata();
	requireEsnext_symbol_asyncDispose();
	requireEsnext_symbol_dispose();
	requireEsnext_symbol_metadata();

	symbol$3 = parent;
	return symbol$3;
}

var esnext_symbol_isRegisteredSymbol = {};

var symbolIsRegistered;
var hasRequiredSymbolIsRegistered;

function requireSymbolIsRegistered () {
	if (hasRequiredSymbolIsRegistered) return symbolIsRegistered;
	hasRequiredSymbolIsRegistered = 1;
	var getBuiltIn = /*@__PURE__*/ requireGetBuiltIn();
	var uncurryThis = /*@__PURE__*/ requireFunctionUncurryThis();

	var Symbol = getBuiltIn('Symbol');
	var keyFor = Symbol.keyFor;
	var thisSymbolValue = uncurryThis(Symbol.prototype.valueOf);

	// `Symbol.isRegisteredSymbol` method
	// https://tc39.es/proposal-symbol-predicates/#sec-symbol-isregisteredsymbol
	symbolIsRegistered = Symbol.isRegisteredSymbol || function isRegisteredSymbol(value) {
	  try {
	    return keyFor(thisSymbolValue(value)) !== undefined;
	  } catch (error) {
	    return false;
	  }
	};
	return symbolIsRegistered;
}

var hasRequiredEsnext_symbol_isRegisteredSymbol;

function requireEsnext_symbol_isRegisteredSymbol () {
	if (hasRequiredEsnext_symbol_isRegisteredSymbol) return esnext_symbol_isRegisteredSymbol;
	hasRequiredEsnext_symbol_isRegisteredSymbol = 1;
	var $ = /*@__PURE__*/ require_export();
	var isRegisteredSymbol = /*@__PURE__*/ requireSymbolIsRegistered();

	// `Symbol.isRegisteredSymbol` method
	// https://tc39.es/proposal-symbol-predicates/#sec-symbol-isregisteredsymbol
	$({ target: 'Symbol', stat: true }, {
	  isRegisteredSymbol: isRegisteredSymbol
	});
	return esnext_symbol_isRegisteredSymbol;
}

var esnext_symbol_isWellKnownSymbol = {};

var symbolIsWellKnown;
var hasRequiredSymbolIsWellKnown;

function requireSymbolIsWellKnown () {
	if (hasRequiredSymbolIsWellKnown) return symbolIsWellKnown;
	hasRequiredSymbolIsWellKnown = 1;
	var shared = /*@__PURE__*/ requireShared();
	var getBuiltIn = /*@__PURE__*/ requireGetBuiltIn();
	var uncurryThis = /*@__PURE__*/ requireFunctionUncurryThis();
	var isSymbol = /*@__PURE__*/ requireIsSymbol();
	var wellKnownSymbol = /*@__PURE__*/ requireWellKnownSymbol();

	var Symbol = getBuiltIn('Symbol');
	var $isWellKnownSymbol = Symbol.isWellKnownSymbol;
	var getOwnPropertyNames = getBuiltIn('Object', 'getOwnPropertyNames');
	var thisSymbolValue = uncurryThis(Symbol.prototype.valueOf);
	var WellKnownSymbolsStore = shared('wks');

	for (var i = 0, symbolKeys = getOwnPropertyNames(Symbol), symbolKeysLength = symbolKeys.length; i < symbolKeysLength; i++) {
	  // some old engines throws on access to some keys like `arguments` or `caller`
	  try {
	    var symbolKey = symbolKeys[i];
	    if (isSymbol(Symbol[symbolKey])) wellKnownSymbol(symbolKey);
	  } catch (error) { /* empty */ }
	}

	// `Symbol.isWellKnownSymbol` method
	// https://tc39.es/proposal-symbol-predicates/#sec-symbol-iswellknownsymbol
	// We should patch it for newly added well-known symbols. If it's not required, this module just will not be injected
	symbolIsWellKnown = function isWellKnownSymbol(value) {
	  if ($isWellKnownSymbol && $isWellKnownSymbol(value)) return true;
	  try {
	    var symbol = thisSymbolValue(value);
	    for (var j = 0, keys = getOwnPropertyNames(WellKnownSymbolsStore), keysLength = keys.length; j < keysLength; j++) {
	      // eslint-disable-next-line eqeqeq -- polyfilled symbols case
	      if (WellKnownSymbolsStore[keys[j]] == symbol) return true;
	    }
	  } catch (error) { /* empty */ }
	  return false;
	};
	return symbolIsWellKnown;
}

var hasRequiredEsnext_symbol_isWellKnownSymbol;

function requireEsnext_symbol_isWellKnownSymbol () {
	if (hasRequiredEsnext_symbol_isWellKnownSymbol) return esnext_symbol_isWellKnownSymbol;
	hasRequiredEsnext_symbol_isWellKnownSymbol = 1;
	var $ = /*@__PURE__*/ require_export();
	var isWellKnownSymbol = /*@__PURE__*/ requireSymbolIsWellKnown();

	// `Symbol.isWellKnownSymbol` method
	// https://tc39.es/proposal-symbol-predicates/#sec-symbol-iswellknownsymbol
	// We should patch it for newly added well-known symbols. If it's not required, this module just will not be injected
	$({ target: 'Symbol', stat: true, forced: true }, {
	  isWellKnownSymbol: isWellKnownSymbol
	});
	return esnext_symbol_isWellKnownSymbol;
}

var esnext_symbol_customMatcher = {};

var hasRequiredEsnext_symbol_customMatcher;

function requireEsnext_symbol_customMatcher () {
	if (hasRequiredEsnext_symbol_customMatcher) return esnext_symbol_customMatcher;
	hasRequiredEsnext_symbol_customMatcher = 1;
	var defineWellKnownSymbol = /*@__PURE__*/ requireWellKnownSymbolDefine();

	// `Symbol.customMatcher` well-known symbol
	// https://github.com/tc39/proposal-pattern-matching
	defineWellKnownSymbol('customMatcher');
	return esnext_symbol_customMatcher;
}

var esnext_symbol_observable = {};

var hasRequiredEsnext_symbol_observable;

function requireEsnext_symbol_observable () {
	if (hasRequiredEsnext_symbol_observable) return esnext_symbol_observable;
	hasRequiredEsnext_symbol_observable = 1;
	var defineWellKnownSymbol = /*@__PURE__*/ requireWellKnownSymbolDefine();

	// `Symbol.observable` well-known symbol
	// https://github.com/tc39/proposal-observable
	defineWellKnownSymbol('observable');
	return esnext_symbol_observable;
}

var esnext_symbol_isRegistered = {};

var hasRequiredEsnext_symbol_isRegistered;

function requireEsnext_symbol_isRegistered () {
	if (hasRequiredEsnext_symbol_isRegistered) return esnext_symbol_isRegistered;
	hasRequiredEsnext_symbol_isRegistered = 1;
	var $ = /*@__PURE__*/ require_export();
	var isRegisteredSymbol = /*@__PURE__*/ requireSymbolIsRegistered();

	// `Symbol.isRegistered` method
	// obsolete version of https://tc39.es/proposal-symbol-predicates/#sec-symbol-isregisteredsymbol
	$({ target: 'Symbol', stat: true, name: 'isRegisteredSymbol' }, {
	  isRegistered: isRegisteredSymbol
	});
	return esnext_symbol_isRegistered;
}

var esnext_symbol_isWellKnown = {};

var hasRequiredEsnext_symbol_isWellKnown;

function requireEsnext_symbol_isWellKnown () {
	if (hasRequiredEsnext_symbol_isWellKnown) return esnext_symbol_isWellKnown;
	hasRequiredEsnext_symbol_isWellKnown = 1;
	var $ = /*@__PURE__*/ require_export();
	var isWellKnownSymbol = /*@__PURE__*/ requireSymbolIsWellKnown();

	// `Symbol.isWellKnown` method
	// obsolete version of https://tc39.es/proposal-symbol-predicates/#sec-symbol-iswellknownsymbol
	// We should patch it for newly added well-known symbols. If it's not required, this module just will not be injected
	$({ target: 'Symbol', stat: true, name: 'isWellKnownSymbol', forced: true }, {
	  isWellKnown: isWellKnownSymbol
	});
	return esnext_symbol_isWellKnown;
}

var esnext_symbol_matcher = {};

var hasRequiredEsnext_symbol_matcher;

function requireEsnext_symbol_matcher () {
	if (hasRequiredEsnext_symbol_matcher) return esnext_symbol_matcher;
	hasRequiredEsnext_symbol_matcher = 1;
	var defineWellKnownSymbol = /*@__PURE__*/ requireWellKnownSymbolDefine();

	// `Symbol.matcher` well-known symbol
	// https://github.com/tc39/proposal-pattern-matching
	defineWellKnownSymbol('matcher');
	return esnext_symbol_matcher;
}

var esnext_symbol_metadataKey = {};

var hasRequiredEsnext_symbol_metadataKey;

function requireEsnext_symbol_metadataKey () {
	if (hasRequiredEsnext_symbol_metadataKey) return esnext_symbol_metadataKey;
	hasRequiredEsnext_symbol_metadataKey = 1;
	// TODO: Remove from `core-js@4`
	var defineWellKnownSymbol = /*@__PURE__*/ requireWellKnownSymbolDefine();

	// `Symbol.metadataKey` well-known symbol
	// https://github.com/tc39/proposal-decorator-metadata
	defineWellKnownSymbol('metadataKey');
	return esnext_symbol_metadataKey;
}

var esnext_symbol_patternMatch = {};

var hasRequiredEsnext_symbol_patternMatch;

function requireEsnext_symbol_patternMatch () {
	if (hasRequiredEsnext_symbol_patternMatch) return esnext_symbol_patternMatch;
	hasRequiredEsnext_symbol_patternMatch = 1;
	// TODO: remove from `core-js@4`
	var defineWellKnownSymbol = /*@__PURE__*/ requireWellKnownSymbolDefine();

	// `Symbol.patternMatch` well-known symbol
	// https://github.com/tc39/proposal-pattern-matching
	defineWellKnownSymbol('patternMatch');
	return esnext_symbol_patternMatch;
}

var esnext_symbol_replaceAll = {};

var hasRequiredEsnext_symbol_replaceAll;

function requireEsnext_symbol_replaceAll () {
	if (hasRequiredEsnext_symbol_replaceAll) return esnext_symbol_replaceAll;
	hasRequiredEsnext_symbol_replaceAll = 1;
	// TODO: remove from `core-js@4`
	var defineWellKnownSymbol = /*@__PURE__*/ requireWellKnownSymbolDefine();

	defineWellKnownSymbol('replaceAll');
	return esnext_symbol_replaceAll;
}

var symbol$2;
var hasRequiredSymbol$2;

function requireSymbol$2 () {
	if (hasRequiredSymbol$2) return symbol$2;
	hasRequiredSymbol$2 = 1;
	var parent = /*@__PURE__*/ requireSymbol$3();
	requireEsnext_symbol_isRegisteredSymbol();
	requireEsnext_symbol_isWellKnownSymbol();
	requireEsnext_symbol_customMatcher();
	requireEsnext_symbol_observable();
	// TODO: Remove from `core-js@4`
	requireEsnext_symbol_isRegistered();
	requireEsnext_symbol_isWellKnown();
	requireEsnext_symbol_matcher();
	requireEsnext_symbol_metadataKey();
	requireEsnext_symbol_patternMatch();
	requireEsnext_symbol_replaceAll();

	symbol$2 = parent;
	return symbol$2;
}

var symbol$1;
var hasRequiredSymbol$1;

function requireSymbol$1 () {
	if (hasRequiredSymbol$1) return symbol$1;
	hasRequiredSymbol$1 = 1;
	symbol$1 = /*@__PURE__*/ requireSymbol$2();
	return symbol$1;
}

var symbolExports$1 = /*@__PURE__*/ requireSymbol$1();
var _Symbol$1 = /*@__PURE__*/getDefaultExportFromCjs(symbolExports$1);

var es_string_iterator = {};

var stringMultibyte;
var hasRequiredStringMultibyte;

function requireStringMultibyte () {
	if (hasRequiredStringMultibyte) return stringMultibyte;
	hasRequiredStringMultibyte = 1;
	var uncurryThis = /*@__PURE__*/ requireFunctionUncurryThis();
	var toIntegerOrInfinity = /*@__PURE__*/ requireToIntegerOrInfinity();
	var toString = /*@__PURE__*/ requireToString();
	var requireObjectCoercible = /*@__PURE__*/ requireRequireObjectCoercible();

	var charAt = uncurryThis(''.charAt);
	var charCodeAt = uncurryThis(''.charCodeAt);
	var stringSlice = uncurryThis(''.slice);

	var createMethod = function (CONVERT_TO_STRING) {
	  return function ($this, pos) {
	    var S = toString(requireObjectCoercible($this));
	    var position = toIntegerOrInfinity(pos);
	    var size = S.length;
	    var first, second;
	    if (position < 0 || position >= size) return CONVERT_TO_STRING ? '' : undefined;
	    first = charCodeAt(S, position);
	    return first < 0xD800 || first > 0xDBFF || position + 1 === size
	      || (second = charCodeAt(S, position + 1)) < 0xDC00 || second > 0xDFFF
	        ? CONVERT_TO_STRING
	          ? charAt(S, position)
	          : first
	        : CONVERT_TO_STRING
	          ? stringSlice(S, position, position + 2)
	          : (first - 0xD800 << 10) + (second - 0xDC00) + 0x10000;
	  };
	};

	stringMultibyte = {
	  // `String.prototype.codePointAt` method
	  // https://tc39.es/ecma262/#sec-string.prototype.codepointat
	  codeAt: createMethod(false),
	  // `String.prototype.at` method
	  // https://github.com/mathiasbynens/String.prototype.at
	  charAt: createMethod(true)
	};
	return stringMultibyte;
}

var hasRequiredEs_string_iterator;

function requireEs_string_iterator () {
	if (hasRequiredEs_string_iterator) return es_string_iterator;
	hasRequiredEs_string_iterator = 1;
	var charAt = /*@__PURE__*/ requireStringMultibyte().charAt;
	var toString = /*@__PURE__*/ requireToString();
	var InternalStateModule = /*@__PURE__*/ requireInternalState();
	var defineIterator = /*@__PURE__*/ requireIteratorDefine();
	var createIterResultObject = /*@__PURE__*/ requireCreateIterResultObject();

	var STRING_ITERATOR = 'String Iterator';
	var setInternalState = InternalStateModule.set;
	var getInternalState = InternalStateModule.getterFor(STRING_ITERATOR);

	// `String.prototype[@@iterator]` method
	// https://tc39.es/ecma262/#sec-string.prototype-@@iterator
	defineIterator(String, 'String', function (iterated) {
	  setInternalState(this, {
	    type: STRING_ITERATOR,
	    string: toString(iterated),
	    index: 0
	  });
	// `%StringIteratorPrototype%.next` method
	// https://tc39.es/ecma262/#sec-%stringiteratorprototype%.next
	}, function next() {
	  var state = getInternalState(this);
	  var string = state.string;
	  var index = state.index;
	  var point;
	  if (index >= string.length) return createIterResultObject(undefined, true);
	  point = charAt(string, index);
	  state.index += point.length;
	  return createIterResultObject(point, false);
	});
	return es_string_iterator;
}

var iterator$4;
var hasRequiredIterator$4;

function requireIterator$4 () {
	if (hasRequiredIterator$4) return iterator$4;
	hasRequiredIterator$4 = 1;
	requireEs_array_iterator();
	requireEs_string_iterator();
	requireEs_symbol_iterator();
	var WrappedWellKnownSymbolModule = /*@__PURE__*/ requireWellKnownSymbolWrapped();

	iterator$4 = WrappedWellKnownSymbolModule.f('iterator');
	return iterator$4;
}

var iterator$3;
var hasRequiredIterator$3;

function requireIterator$3 () {
	if (hasRequiredIterator$3) return iterator$3;
	hasRequiredIterator$3 = 1;
	var parent = /*@__PURE__*/ requireIterator$4();
	requireWeb_domCollections_iterator();

	iterator$3 = parent;
	return iterator$3;
}

var iterator$2;
var hasRequiredIterator$2;

function requireIterator$2 () {
	if (hasRequiredIterator$2) return iterator$2;
	hasRequiredIterator$2 = 1;
	var parent = /*@__PURE__*/ requireIterator$3();

	iterator$2 = parent;
	return iterator$2;
}

var iterator$1;
var hasRequiredIterator$1;

function requireIterator$1 () {
	if (hasRequiredIterator$1) return iterator$1;
	hasRequiredIterator$1 = 1;
	var parent = /*@__PURE__*/ requireIterator$2();

	iterator$1 = parent;
	return iterator$1;
}

var iterator;
var hasRequiredIterator;

function requireIterator () {
	if (hasRequiredIterator) return iterator;
	hasRequiredIterator = 1;
	iterator = /*@__PURE__*/ requireIterator$1();
	return iterator;
}

var iteratorExports = /*@__PURE__*/ requireIterator();
var _Symbol$iterator = /*@__PURE__*/getDefaultExportFromCjs(iteratorExports);

function _typeof(o) {
  "@babel/helpers - typeof";

  return _typeof = "function" == typeof _Symbol$1 && "symbol" == typeof _Symbol$iterator ? function (o) {
    return typeof o;
  } : function (o) {
    return o && "function" == typeof _Symbol$1 && o.constructor === _Symbol$1 && o !== _Symbol$1.prototype ? "symbol" : typeof o;
  }, _typeof(o);
}

var toPrimitive$5;
var hasRequiredToPrimitive$4;

function requireToPrimitive$4 () {
	if (hasRequiredToPrimitive$4) return toPrimitive$5;
	hasRequiredToPrimitive$4 = 1;
	requireEs_symbol_toPrimitive();
	var WrappedWellKnownSymbolModule = /*@__PURE__*/ requireWellKnownSymbolWrapped();

	toPrimitive$5 = WrappedWellKnownSymbolModule.f('toPrimitive');
	return toPrimitive$5;
}

var toPrimitive$4;
var hasRequiredToPrimitive$3;

function requireToPrimitive$3 () {
	if (hasRequiredToPrimitive$3) return toPrimitive$4;
	hasRequiredToPrimitive$3 = 1;
	var parent = /*@__PURE__*/ requireToPrimitive$4();

	toPrimitive$4 = parent;
	return toPrimitive$4;
}

var toPrimitive$3;
var hasRequiredToPrimitive$2;

function requireToPrimitive$2 () {
	if (hasRequiredToPrimitive$2) return toPrimitive$3;
	hasRequiredToPrimitive$2 = 1;
	var parent = /*@__PURE__*/ requireToPrimitive$3();

	toPrimitive$3 = parent;
	return toPrimitive$3;
}

var toPrimitive$2;
var hasRequiredToPrimitive$1;

function requireToPrimitive$1 () {
	if (hasRequiredToPrimitive$1) return toPrimitive$2;
	hasRequiredToPrimitive$1 = 1;
	var parent = /*@__PURE__*/ requireToPrimitive$2();

	toPrimitive$2 = parent;
	return toPrimitive$2;
}

var toPrimitive$1;
var hasRequiredToPrimitive;

function requireToPrimitive () {
	if (hasRequiredToPrimitive) return toPrimitive$1;
	hasRequiredToPrimitive = 1;
	toPrimitive$1 = /*@__PURE__*/ requireToPrimitive$1();
	return toPrimitive$1;
}

var toPrimitiveExports = /*@__PURE__*/ requireToPrimitive();
var _Symbol$toPrimitive = /*@__PURE__*/getDefaultExportFromCjs(toPrimitiveExports);

function toPrimitive(t, r) {
  if ("object" != _typeof(t) || !t) return t;
  var e = t[_Symbol$toPrimitive];
  if (void 0 !== e) {
    var i = e.call(t, r);
    if ("object" != _typeof(i)) return i;
    throw new TypeError("@@toPrimitive must return a primitive value.");
  }
  return ("string" === r ? String : Number)(t);
}

function toPropertyKey(t) {
  var i = toPrimitive(t, "string");
  return "symbol" == _typeof(i) ? i : i + "";
}

function _defineProperty(e, r, t) {
  return (r = toPropertyKey(r)) in e ? _Object$defineProperty$1(e, r, {
    value: t,
    enumerable: true,
    configurable: true,
    writable: true
  }) : e[r] = t, e;
}

var es_array_map = {};

var hasRequiredEs_array_map;

function requireEs_array_map () {
	if (hasRequiredEs_array_map) return es_array_map;
	hasRequiredEs_array_map = 1;
	var $ = /*@__PURE__*/ require_export();
	var $map = /*@__PURE__*/ requireArrayIteration().map;
	var arrayMethodHasSpeciesSupport = /*@__PURE__*/ requireArrayMethodHasSpeciesSupport();

	var HAS_SPECIES_SUPPORT = arrayMethodHasSpeciesSupport('map');

	// `Array.prototype.map` method
	// https://tc39.es/ecma262/#sec-array.prototype.map
	// with adding support of @@species
	$({ target: 'Array', proto: true, forced: !HAS_SPECIES_SUPPORT }, {
	  map: function map(callbackfn /* , thisArg */) {
	    return $map(this, callbackfn, arguments.length > 1 ? arguments[1] : undefined);
	  }
	});
	return es_array_map;
}

var map$3;
var hasRequiredMap$3;

function requireMap$3 () {
	if (hasRequiredMap$3) return map$3;
	hasRequiredMap$3 = 1;
	requireEs_array_map();
	var getBuiltInPrototypeMethod = /*@__PURE__*/ requireGetBuiltInPrototypeMethod();

	map$3 = getBuiltInPrototypeMethod('Array', 'map');
	return map$3;
}

var map$2;
var hasRequiredMap$2;

function requireMap$2 () {
	if (hasRequiredMap$2) return map$2;
	hasRequiredMap$2 = 1;
	var isPrototypeOf = /*@__PURE__*/ requireObjectIsPrototypeOf();
	var method = /*@__PURE__*/ requireMap$3();

	var ArrayPrototype = Array.prototype;

	map$2 = function (it) {
	  var own = it.map;
	  return it === ArrayPrototype || (isPrototypeOf(ArrayPrototype, it) && own === ArrayPrototype.map) ? method : own;
	};
	return map$2;
}

var map$1;
var hasRequiredMap$1;

function requireMap$1 () {
	if (hasRequiredMap$1) return map$1;
	hasRequiredMap$1 = 1;
	var parent = /*@__PURE__*/ requireMap$2();

	map$1 = parent;
	return map$1;
}

var map;
var hasRequiredMap;

function requireMap () {
	if (hasRequiredMap) return map;
	hasRequiredMap = 1;
	map = /*@__PURE__*/ requireMap$1();
	return map;
}

var mapExports = requireMap();
var _mapInstanceProperty = /*@__PURE__*/getDefaultExportFromCjs(mapExports);

var es_array_reduce = {};

var arrayReduce;
var hasRequiredArrayReduce;

function requireArrayReduce () {
	if (hasRequiredArrayReduce) return arrayReduce;
	hasRequiredArrayReduce = 1;
	var aCallable = /*@__PURE__*/ requireACallable();
	var toObject = /*@__PURE__*/ requireToObject();
	var IndexedObject = /*@__PURE__*/ requireIndexedObject();
	var lengthOfArrayLike = /*@__PURE__*/ requireLengthOfArrayLike();

	var $TypeError = TypeError;

	var REDUCE_EMPTY = 'Reduce of empty array with no initial value';

	// `Array.prototype.{ reduce, reduceRight }` methods implementation
	var createMethod = function (IS_RIGHT) {
	  return function (that, callbackfn, argumentsLength, memo) {
	    var O = toObject(that);
	    var self = IndexedObject(O);
	    var length = lengthOfArrayLike(O);
	    aCallable(callbackfn);
	    if (length === 0 && argumentsLength < 2) throw new $TypeError(REDUCE_EMPTY);
	    var index = IS_RIGHT ? length - 1 : 0;
	    var i = IS_RIGHT ? -1 : 1;
	    if (argumentsLength < 2) while (true) {
	      if (index in self) {
	        memo = self[index];
	        index += i;
	        break;
	      }
	      index += i;
	      if (IS_RIGHT ? index < 0 : length <= index) {
	        throw new $TypeError(REDUCE_EMPTY);
	      }
	    }
	    for (;IS_RIGHT ? index >= 0 : length > index; index += i) if (index in self) {
	      memo = callbackfn(memo, self[index], index, O);
	    }
	    return memo;
	  };
	};

	arrayReduce = {
	  // `Array.prototype.reduce` method
	  // https://tc39.es/ecma262/#sec-array.prototype.reduce
	  left: createMethod(false),
	  // `Array.prototype.reduceRight` method
	  // https://tc39.es/ecma262/#sec-array.prototype.reduceright
	  right: createMethod(true)
	};
	return arrayReduce;
}

var environmentIsNode;
var hasRequiredEnvironmentIsNode;

function requireEnvironmentIsNode () {
	if (hasRequiredEnvironmentIsNode) return environmentIsNode;
	hasRequiredEnvironmentIsNode = 1;
	var ENVIRONMENT = /*@__PURE__*/ requireEnvironment();

	environmentIsNode = ENVIRONMENT === 'NODE';
	return environmentIsNode;
}

var hasRequiredEs_array_reduce;

function requireEs_array_reduce () {
	if (hasRequiredEs_array_reduce) return es_array_reduce;
	hasRequiredEs_array_reduce = 1;
	var $ = /*@__PURE__*/ require_export();
	var $reduce = /*@__PURE__*/ requireArrayReduce().left;
	var arrayMethodIsStrict = /*@__PURE__*/ requireArrayMethodIsStrict();
	var CHROME_VERSION = /*@__PURE__*/ requireEnvironmentV8Version();
	var IS_NODE = /*@__PURE__*/ requireEnvironmentIsNode();

	// Chrome 80-82 has a critical bug
	// https://bugs.chromium.org/p/chromium/issues/detail?id=1049982
	var CHROME_BUG = !IS_NODE && CHROME_VERSION > 79 && CHROME_VERSION < 83;
	var FORCED = CHROME_BUG || !arrayMethodIsStrict('reduce');

	// `Array.prototype.reduce` method
	// https://tc39.es/ecma262/#sec-array.prototype.reduce
	$({ target: 'Array', proto: true, forced: FORCED }, {
	  reduce: function reduce(callbackfn /* , initialValue */) {
	    var length = arguments.length;
	    return $reduce(this, callbackfn, length, length > 1 ? arguments[1] : undefined);
	  }
	});
	return es_array_reduce;
}

var reduce$3;
var hasRequiredReduce$3;

function requireReduce$3 () {
	if (hasRequiredReduce$3) return reduce$3;
	hasRequiredReduce$3 = 1;
	requireEs_array_reduce();
	var getBuiltInPrototypeMethod = /*@__PURE__*/ requireGetBuiltInPrototypeMethod();

	reduce$3 = getBuiltInPrototypeMethod('Array', 'reduce');
	return reduce$3;
}

var reduce$2;
var hasRequiredReduce$2;

function requireReduce$2 () {
	if (hasRequiredReduce$2) return reduce$2;
	hasRequiredReduce$2 = 1;
	var isPrototypeOf = /*@__PURE__*/ requireObjectIsPrototypeOf();
	var method = /*@__PURE__*/ requireReduce$3();

	var ArrayPrototype = Array.prototype;

	reduce$2 = function (it) {
	  var own = it.reduce;
	  return it === ArrayPrototype || (isPrototypeOf(ArrayPrototype, it) && own === ArrayPrototype.reduce) ? method : own;
	};
	return reduce$2;
}

var reduce$1;
var hasRequiredReduce$1;

function requireReduce$1 () {
	if (hasRequiredReduce$1) return reduce$1;
	hasRequiredReduce$1 = 1;
	var parent = /*@__PURE__*/ requireReduce$2();

	reduce$1 = parent;
	return reduce$1;
}

var reduce;
var hasRequiredReduce;

function requireReduce () {
	if (hasRequiredReduce) return reduce;
	hasRequiredReduce = 1;
	reduce = /*@__PURE__*/ requireReduce$1();
	return reduce;
}

var reduceExports = requireReduce();
var _reduceInstanceProperty = /*@__PURE__*/getDefaultExportFromCjs(reduceExports);

var es_object_keys = {};

var hasRequiredEs_object_keys;

function requireEs_object_keys () {
	if (hasRequiredEs_object_keys) return es_object_keys;
	hasRequiredEs_object_keys = 1;
	var $ = /*@__PURE__*/ require_export();
	var toObject = /*@__PURE__*/ requireToObject();
	var nativeKeys = /*@__PURE__*/ requireObjectKeys();
	var fails = /*@__PURE__*/ requireFails();

	var FAILS_ON_PRIMITIVES = fails(function () { nativeKeys(1); });

	// `Object.keys` method
	// https://tc39.es/ecma262/#sec-object.keys
	$({ target: 'Object', stat: true, forced: FAILS_ON_PRIMITIVES }, {
	  keys: function keys(it) {
	    return nativeKeys(toObject(it));
	  }
	});
	return es_object_keys;
}

var keys$2;
var hasRequiredKeys$2;

function requireKeys$2 () {
	if (hasRequiredKeys$2) return keys$2;
	hasRequiredKeys$2 = 1;
	requireEs_object_keys();
	var path = /*@__PURE__*/ requirePath();

	keys$2 = path.Object.keys;
	return keys$2;
}

var keys$1;
var hasRequiredKeys$1;

function requireKeys$1 () {
	if (hasRequiredKeys$1) return keys$1;
	hasRequiredKeys$1 = 1;
	var parent = /*@__PURE__*/ requireKeys$2();

	keys$1 = parent;
	return keys$1;
}

var keys;
var hasRequiredKeys;

function requireKeys () {
	if (hasRequiredKeys) return keys;
	hasRequiredKeys = 1;
	keys = /*@__PURE__*/ requireKeys$1();
	return keys;
}

var keysExports = requireKeys();
var _Object$keys = /*@__PURE__*/getDefaultExportFromCjs(keysExports);

var defineProperty;
var hasRequiredDefineProperty;

function requireDefineProperty () {
	if (hasRequiredDefineProperty) return defineProperty;
	hasRequiredDefineProperty = 1;
	defineProperty = /*@__PURE__*/ requireDefineProperty$4();
	return defineProperty;
}

var definePropertyExports = requireDefineProperty();
var _Object$defineProperty = /*@__PURE__*/getDefaultExportFromCjs(definePropertyExports);

var symbol;
var hasRequiredSymbol;

function requireSymbol () {
	if (hasRequiredSymbol) return symbol;
	hasRequiredSymbol = 1;
	symbol = /*@__PURE__*/ requireSymbol$4();
	return symbol;
}

var symbolExports = requireSymbol();
var _Symbol = /*@__PURE__*/getDefaultExportFromCjs(symbolExports);

var es_array_slice = {};

var hasRequiredEs_array_slice;

function requireEs_array_slice () {
	if (hasRequiredEs_array_slice) return es_array_slice;
	hasRequiredEs_array_slice = 1;
	var $ = /*@__PURE__*/ require_export();
	var isArray = /*@__PURE__*/ requireIsArray$3();
	var isConstructor = /*@__PURE__*/ requireIsConstructor();
	var isObject = /*@__PURE__*/ requireIsObject();
	var toAbsoluteIndex = /*@__PURE__*/ requireToAbsoluteIndex();
	var lengthOfArrayLike = /*@__PURE__*/ requireLengthOfArrayLike();
	var toIndexedObject = /*@__PURE__*/ requireToIndexedObject();
	var createProperty = /*@__PURE__*/ requireCreateProperty();
	var wellKnownSymbol = /*@__PURE__*/ requireWellKnownSymbol();
	var arrayMethodHasSpeciesSupport = /*@__PURE__*/ requireArrayMethodHasSpeciesSupport();
	var nativeSlice = /*@__PURE__*/ requireArraySlice();

	var HAS_SPECIES_SUPPORT = arrayMethodHasSpeciesSupport('slice');

	var SPECIES = wellKnownSymbol('species');
	var $Array = Array;
	var max = Math.max;

	// `Array.prototype.slice` method
	// https://tc39.es/ecma262/#sec-array.prototype.slice
	// fallback for not array-like ES3 strings and DOM objects
	$({ target: 'Array', proto: true, forced: !HAS_SPECIES_SUPPORT }, {
	  slice: function slice(start, end) {
	    var O = toIndexedObject(this);
	    var length = lengthOfArrayLike(O);
	    var k = toAbsoluteIndex(start, length);
	    var fin = toAbsoluteIndex(end === undefined ? length : end, length);
	    // inline `ArraySpeciesCreate` for usage native `Array#slice` where it's possible
	    var Constructor, result, n;
	    if (isArray(O)) {
	      Constructor = O.constructor;
	      // cross-realm fallback
	      if (isConstructor(Constructor) && (Constructor === $Array || isArray(Constructor.prototype))) {
	        Constructor = undefined;
	      } else if (isObject(Constructor)) {
	        Constructor = Constructor[SPECIES];
	        if (Constructor === null) Constructor = undefined;
	      }
	      if (Constructor === $Array || Constructor === undefined) {
	        return nativeSlice(O, k, fin);
	      }
	    }
	    result = new (Constructor === undefined ? $Array : Constructor)(max(fin - k, 0));
	    for (n = 0; k < fin; k++, n++) if (k in O) createProperty(result, n, O[k]);
	    result.length = n;
	    return result;
	  }
	});
	return es_array_slice;
}

var slice$3;
var hasRequiredSlice$3;

function requireSlice$3 () {
	if (hasRequiredSlice$3) return slice$3;
	hasRequiredSlice$3 = 1;
	requireEs_array_slice();
	var getBuiltInPrototypeMethod = /*@__PURE__*/ requireGetBuiltInPrototypeMethod();

	slice$3 = getBuiltInPrototypeMethod('Array', 'slice');
	return slice$3;
}

var slice$2;
var hasRequiredSlice$2;

function requireSlice$2 () {
	if (hasRequiredSlice$2) return slice$2;
	hasRequiredSlice$2 = 1;
	var isPrototypeOf = /*@__PURE__*/ requireObjectIsPrototypeOf();
	var method = /*@__PURE__*/ requireSlice$3();

	var ArrayPrototype = Array.prototype;

	slice$2 = function (it) {
	  var own = it.slice;
	  return it === ArrayPrototype || (isPrototypeOf(ArrayPrototype, it) && own === ArrayPrototype.slice) ? method : own;
	};
	return slice$2;
}

var slice$1;
var hasRequiredSlice$1;

function requireSlice$1 () {
	if (hasRequiredSlice$1) return slice$1;
	hasRequiredSlice$1 = 1;
	var parent = /*@__PURE__*/ requireSlice$2();

	slice$1 = parent;
	return slice$1;
}

var slice;
var hasRequiredSlice;

function requireSlice () {
	if (hasRequiredSlice) return slice;
	hasRequiredSlice = 1;
	slice = /*@__PURE__*/ requireSlice$1();
	return slice;
}

var sliceExports = requireSlice();
var _sliceInstanceProperty = /*@__PURE__*/getDefaultExportFromCjs(sliceExports);

var es_reflect_ownKeys = {};

var hasRequiredEs_reflect_ownKeys;

function requireEs_reflect_ownKeys () {
	if (hasRequiredEs_reflect_ownKeys) return es_reflect_ownKeys;
	hasRequiredEs_reflect_ownKeys = 1;
	var $ = /*@__PURE__*/ require_export();
	var ownKeys = /*@__PURE__*/ requireOwnKeys$3();

	// `Reflect.ownKeys` method
	// https://tc39.es/ecma262/#sec-reflect.ownkeys
	$({ target: 'Reflect', stat: true }, {
	  ownKeys: ownKeys
	});
	return es_reflect_ownKeys;
}

var ownKeys$3;
var hasRequiredOwnKeys$2;

function requireOwnKeys$2 () {
	if (hasRequiredOwnKeys$2) return ownKeys$3;
	hasRequiredOwnKeys$2 = 1;
	requireEs_reflect_ownKeys();
	var path = /*@__PURE__*/ requirePath();

	ownKeys$3 = path.Reflect.ownKeys;
	return ownKeys$3;
}

var ownKeys$2;
var hasRequiredOwnKeys$1;

function requireOwnKeys$1 () {
	if (hasRequiredOwnKeys$1) return ownKeys$2;
	hasRequiredOwnKeys$1 = 1;
	var parent = /*@__PURE__*/ requireOwnKeys$2();

	ownKeys$2 = parent;
	return ownKeys$2;
}

var ownKeys$1;
var hasRequiredOwnKeys;

function requireOwnKeys () {
	if (hasRequiredOwnKeys) return ownKeys$1;
	hasRequiredOwnKeys = 1;
	ownKeys$1 = /*@__PURE__*/ requireOwnKeys$1();
	return ownKeys$1;
}

var ownKeysExports = requireOwnKeys();
var _Reflect$ownKeys = /*@__PURE__*/getDefaultExportFromCjs(ownKeysExports);

var es_date_now = {};

var hasRequiredEs_date_now;

function requireEs_date_now () {
	if (hasRequiredEs_date_now) return es_date_now;
	hasRequiredEs_date_now = 1;
	// TODO: Remove from `core-js@4`
	var $ = /*@__PURE__*/ require_export();
	var uncurryThis = /*@__PURE__*/ requireFunctionUncurryThis();

	var $Date = Date;
	var thisTimeValue = uncurryThis($Date.prototype.getTime);

	// `Date.now` method
	// https://tc39.es/ecma262/#sec-date.now
	$({ target: 'Date', stat: true }, {
	  now: function now() {
	    return thisTimeValue(new $Date());
	  }
	});
	return es_date_now;
}

var now$3;
var hasRequiredNow$2;

function requireNow$2 () {
	if (hasRequiredNow$2) return now$3;
	hasRequiredNow$2 = 1;
	requireEs_date_now();
	var path = /*@__PURE__*/ requirePath();

	now$3 = path.Date.now;
	return now$3;
}

var now$2;
var hasRequiredNow$1;

function requireNow$1 () {
	if (hasRequiredNow$1) return now$2;
	hasRequiredNow$1 = 1;
	var parent = /*@__PURE__*/ requireNow$2();

	now$2 = parent;
	return now$2;
}

var now$1;
var hasRequiredNow;

function requireNow () {
	if (hasRequiredNow) return now$1;
	hasRequiredNow = 1;
	now$1 = /*@__PURE__*/ requireNow$1();
	return now$1;
}

var nowExports = requireNow();
var _Date$now = /*@__PURE__*/getDefaultExportFromCjs(nowExports);

var es_array_reverse = {};

var hasRequiredEs_array_reverse;

function requireEs_array_reverse () {
	if (hasRequiredEs_array_reverse) return es_array_reverse;
	hasRequiredEs_array_reverse = 1;
	var $ = /*@__PURE__*/ require_export();
	var uncurryThis = /*@__PURE__*/ requireFunctionUncurryThis();
	var isArray = /*@__PURE__*/ requireIsArray$3();

	var nativeReverse = uncurryThis([].reverse);
	var test = [1, 2];

	// `Array.prototype.reverse` method
	// https://tc39.es/ecma262/#sec-array.prototype.reverse
	// fix for Safari 12.0 bug
	// https://bugs.webkit.org/show_bug.cgi?id=188794
	$({ target: 'Array', proto: true, forced: String(test) === String(test.reverse()) }, {
	  reverse: function reverse() {
	    // eslint-disable-next-line no-self-assign -- dirty hack
	    if (isArray(this)) this.length = this.length;
	    return nativeReverse(this);
	  }
	});
	return es_array_reverse;
}

var reverse$3;
var hasRequiredReverse$3;

function requireReverse$3 () {
	if (hasRequiredReverse$3) return reverse$3;
	hasRequiredReverse$3 = 1;
	requireEs_array_reverse();
	var getBuiltInPrototypeMethod = /*@__PURE__*/ requireGetBuiltInPrototypeMethod();

	reverse$3 = getBuiltInPrototypeMethod('Array', 'reverse');
	return reverse$3;
}

var reverse$2;
var hasRequiredReverse$2;

function requireReverse$2 () {
	if (hasRequiredReverse$2) return reverse$2;
	hasRequiredReverse$2 = 1;
	var isPrototypeOf = /*@__PURE__*/ requireObjectIsPrototypeOf();
	var method = /*@__PURE__*/ requireReverse$3();

	var ArrayPrototype = Array.prototype;

	reverse$2 = function (it) {
	  var own = it.reverse;
	  return it === ArrayPrototype || (isPrototypeOf(ArrayPrototype, it) && own === ArrayPrototype.reverse) ? method : own;
	};
	return reverse$2;
}

var reverse$1;
var hasRequiredReverse$1;

function requireReverse$1 () {
	if (hasRequiredReverse$1) return reverse$1;
	hasRequiredReverse$1 = 1;
	var parent = /*@__PURE__*/ requireReverse$2();

	reverse$1 = parent;
	return reverse$1;
}

var reverse;
var hasRequiredReverse;

function requireReverse () {
	if (hasRequiredReverse) return reverse;
	hasRequiredReverse = 1;
	reverse = /*@__PURE__*/ requireReverse$1();
	return reverse;
}

var reverseExports = requireReverse();
var _reverseInstanceProperty = /*@__PURE__*/getDefaultExportFromCjs(reverseExports);

var es_array_splice = {};

var arraySetLength;
var hasRequiredArraySetLength;

function requireArraySetLength () {
	if (hasRequiredArraySetLength) return arraySetLength;
	hasRequiredArraySetLength = 1;
	var DESCRIPTORS = /*@__PURE__*/ requireDescriptors();
	var isArray = /*@__PURE__*/ requireIsArray$3();

	var $TypeError = TypeError;
	// eslint-disable-next-line es/no-object-getownpropertydescriptor -- safe
	var getOwnPropertyDescriptor = Object.getOwnPropertyDescriptor;

	// Safari < 13 does not throw an error in this case
	var SILENT_ON_NON_WRITABLE_LENGTH_SET = DESCRIPTORS && !function () {
	  // makes no sense without proper strict mode support
	  if (this !== undefined) return true;
	  try {
	    // eslint-disable-next-line es/no-object-defineproperty -- safe
	    Object.defineProperty([], 'length', { writable: false }).length = 1;
	  } catch (error) {
	    return error instanceof TypeError;
	  }
	}();

	arraySetLength = SILENT_ON_NON_WRITABLE_LENGTH_SET ? function (O, length) {
	  if (isArray(O) && !getOwnPropertyDescriptor(O, 'length').writable) {
	    throw new $TypeError('Cannot set read only .length');
	  } return O.length = length;
	} : function (O, length) {
	  return O.length = length;
	};
	return arraySetLength;
}

var deletePropertyOrThrow;
var hasRequiredDeletePropertyOrThrow;

function requireDeletePropertyOrThrow () {
	if (hasRequiredDeletePropertyOrThrow) return deletePropertyOrThrow;
	hasRequiredDeletePropertyOrThrow = 1;
	var tryToString = /*@__PURE__*/ requireTryToString();

	var $TypeError = TypeError;

	deletePropertyOrThrow = function (O, P) {
	  if (!delete O[P]) throw new $TypeError('Cannot delete property ' + tryToString(P) + ' of ' + tryToString(O));
	};
	return deletePropertyOrThrow;
}

var hasRequiredEs_array_splice;

function requireEs_array_splice () {
	if (hasRequiredEs_array_splice) return es_array_splice;
	hasRequiredEs_array_splice = 1;
	var $ = /*@__PURE__*/ require_export();
	var toObject = /*@__PURE__*/ requireToObject();
	var toAbsoluteIndex = /*@__PURE__*/ requireToAbsoluteIndex();
	var toIntegerOrInfinity = /*@__PURE__*/ requireToIntegerOrInfinity();
	var lengthOfArrayLike = /*@__PURE__*/ requireLengthOfArrayLike();
	var setArrayLength = /*@__PURE__*/ requireArraySetLength();
	var doesNotExceedSafeInteger = /*@__PURE__*/ requireDoesNotExceedSafeInteger();
	var arraySpeciesCreate = /*@__PURE__*/ requireArraySpeciesCreate();
	var createProperty = /*@__PURE__*/ requireCreateProperty();
	var deletePropertyOrThrow = /*@__PURE__*/ requireDeletePropertyOrThrow();
	var arrayMethodHasSpeciesSupport = /*@__PURE__*/ requireArrayMethodHasSpeciesSupport();

	var HAS_SPECIES_SUPPORT = arrayMethodHasSpeciesSupport('splice');

	var max = Math.max;
	var min = Math.min;

	// `Array.prototype.splice` method
	// https://tc39.es/ecma262/#sec-array.prototype.splice
	// with adding support of @@species
	$({ target: 'Array', proto: true, forced: !HAS_SPECIES_SUPPORT }, {
	  splice: function splice(start, deleteCount /* , ...items */) {
	    var O = toObject(this);
	    var len = lengthOfArrayLike(O);
	    var actualStart = toAbsoluteIndex(start, len);
	    var argumentsLength = arguments.length;
	    var insertCount, actualDeleteCount, A, k, from, to;
	    if (argumentsLength === 0) {
	      insertCount = actualDeleteCount = 0;
	    } else if (argumentsLength === 1) {
	      insertCount = 0;
	      actualDeleteCount = len - actualStart;
	    } else {
	      insertCount = argumentsLength - 2;
	      actualDeleteCount = min(max(toIntegerOrInfinity(deleteCount), 0), len - actualStart);
	    }
	    doesNotExceedSafeInteger(len + insertCount - actualDeleteCount);
	    A = arraySpeciesCreate(O, actualDeleteCount);
	    for (k = 0; k < actualDeleteCount; k++) {
	      from = actualStart + k;
	      if (from in O) createProperty(A, k, O[from]);
	    }
	    A.length = actualDeleteCount;
	    if (insertCount < actualDeleteCount) {
	      for (k = actualStart; k < len - actualDeleteCount; k++) {
	        from = k + actualDeleteCount;
	        to = k + insertCount;
	        if (from in O) O[to] = O[from];
	        else deletePropertyOrThrow(O, to);
	      }
	      for (k = len; k > len - actualDeleteCount + insertCount; k--) deletePropertyOrThrow(O, k - 1);
	    } else if (insertCount > actualDeleteCount) {
	      for (k = len - actualDeleteCount; k > actualStart; k--) {
	        from = k + actualDeleteCount - 1;
	        to = k + insertCount - 1;
	        if (from in O) O[to] = O[from];
	        else deletePropertyOrThrow(O, to);
	      }
	    }
	    for (k = 0; k < insertCount; k++) {
	      O[k + actualStart] = arguments[k + 2];
	    }
	    setArrayLength(O, len - actualDeleteCount + insertCount);
	    return A;
	  }
	});
	return es_array_splice;
}

var splice$3;
var hasRequiredSplice$3;

function requireSplice$3 () {
	if (hasRequiredSplice$3) return splice$3;
	hasRequiredSplice$3 = 1;
	requireEs_array_splice();
	var getBuiltInPrototypeMethod = /*@__PURE__*/ requireGetBuiltInPrototypeMethod();

	splice$3 = getBuiltInPrototypeMethod('Array', 'splice');
	return splice$3;
}

var splice$2;
var hasRequiredSplice$2;

function requireSplice$2 () {
	if (hasRequiredSplice$2) return splice$2;
	hasRequiredSplice$2 = 1;
	var isPrototypeOf = /*@__PURE__*/ requireObjectIsPrototypeOf();
	var method = /*@__PURE__*/ requireSplice$3();

	var ArrayPrototype = Array.prototype;

	splice$2 = function (it) {
	  var own = it.splice;
	  return it === ArrayPrototype || (isPrototypeOf(ArrayPrototype, it) && own === ArrayPrototype.splice) ? method : own;
	};
	return splice$2;
}

var splice$1;
var hasRequiredSplice$1;

function requireSplice$1 () {
	if (hasRequiredSplice$1) return splice$1;
	hasRequiredSplice$1 = 1;
	var parent = /*@__PURE__*/ requireSplice$2();

	splice$1 = parent;
	return splice$1;
}

var splice;
var hasRequiredSplice;

function requireSplice () {
	if (hasRequiredSplice) return splice;
	hasRequiredSplice = 1;
	splice = /*@__PURE__*/ requireSplice$1();
	return splice;
}

var spliceExports = requireSplice();
var _spliceInstanceProperty = /*@__PURE__*/getDefaultExportFromCjs(spliceExports);

var es_object_assign = {};

var objectAssign;
var hasRequiredObjectAssign;

function requireObjectAssign () {
	if (hasRequiredObjectAssign) return objectAssign;
	hasRequiredObjectAssign = 1;
	var DESCRIPTORS = /*@__PURE__*/ requireDescriptors();
	var uncurryThis = /*@__PURE__*/ requireFunctionUncurryThis();
	var call = /*@__PURE__*/ requireFunctionCall();
	var fails = /*@__PURE__*/ requireFails();
	var objectKeys = /*@__PURE__*/ requireObjectKeys();
	var getOwnPropertySymbolsModule = /*@__PURE__*/ requireObjectGetOwnPropertySymbols();
	var propertyIsEnumerableModule = /*@__PURE__*/ requireObjectPropertyIsEnumerable();
	var toObject = /*@__PURE__*/ requireToObject();
	var IndexedObject = /*@__PURE__*/ requireIndexedObject();

	// eslint-disable-next-line es/no-object-assign -- safe
	var $assign = Object.assign;
	// eslint-disable-next-line es/no-object-defineproperty -- required for testing
	var defineProperty = Object.defineProperty;
	var concat = uncurryThis([].concat);

	// `Object.assign` method
	// https://tc39.es/ecma262/#sec-object.assign
	objectAssign = !$assign || fails(function () {
	  // should have correct order of operations (Edge bug)
	  if (DESCRIPTORS && $assign({ b: 1 }, $assign(defineProperty({}, 'a', {
	    enumerable: true,
	    get: function () {
	      defineProperty(this, 'b', {
	        value: 3,
	        enumerable: false
	      });
	    }
	  }), { b: 2 })).b !== 1) return true;
	  // should work with symbols and should have deterministic property order (V8 bug)
	  var A = {};
	  var B = {};
	  // eslint-disable-next-line es/no-symbol -- safe
	  var symbol = Symbol('assign detection');
	  var alphabet = 'abcdefghijklmnopqrst';
	  A[symbol] = 7;
	  // eslint-disable-next-line es/no-array-prototype-foreach -- safe
	  alphabet.split('').forEach(function (chr) { B[chr] = chr; });
	  return $assign({}, A)[symbol] !== 7 || objectKeys($assign({}, B)).join('') !== alphabet;
	}) ? function assign(target, source) { // eslint-disable-line no-unused-vars -- required for `.length`
	  var T = toObject(target);
	  var argumentsLength = arguments.length;
	  var index = 1;
	  var getOwnPropertySymbols = getOwnPropertySymbolsModule.f;
	  var propertyIsEnumerable = propertyIsEnumerableModule.f;
	  while (argumentsLength > index) {
	    var S = IndexedObject(arguments[index++]);
	    var keys = getOwnPropertySymbols ? concat(objectKeys(S), getOwnPropertySymbols(S)) : objectKeys(S);
	    var length = keys.length;
	    var j = 0;
	    var key;
	    while (length > j) {
	      key = keys[j++];
	      if (!DESCRIPTORS || call(propertyIsEnumerable, S, key)) T[key] = S[key];
	    }
	  } return T;
	} : $assign;
	return objectAssign;
}

var hasRequiredEs_object_assign;

function requireEs_object_assign () {
	if (hasRequiredEs_object_assign) return es_object_assign;
	hasRequiredEs_object_assign = 1;
	var $ = /*@__PURE__*/ require_export();
	var assign = /*@__PURE__*/ requireObjectAssign();

	// `Object.assign` method
	// https://tc39.es/ecma262/#sec-object.assign
	// eslint-disable-next-line es/no-object-assign -- required for testing
	$({ target: 'Object', stat: true, arity: 2, forced: Object.assign !== assign }, {
	  assign: assign
	});
	return es_object_assign;
}

var assign$4;
var hasRequiredAssign$2;

function requireAssign$2 () {
	if (hasRequiredAssign$2) return assign$4;
	hasRequiredAssign$2 = 1;
	requireEs_object_assign();
	var path = /*@__PURE__*/ requirePath();

	assign$4 = path.Object.assign;
	return assign$4;
}

var assign$3;
var hasRequiredAssign$1;

function requireAssign$1 () {
	if (hasRequiredAssign$1) return assign$3;
	hasRequiredAssign$1 = 1;
	var parent = /*@__PURE__*/ requireAssign$2();

	assign$3 = parent;
	return assign$3;
}

var assign$2;
var hasRequiredAssign;

function requireAssign () {
	if (hasRequiredAssign) return assign$2;
	hasRequiredAssign = 1;
	assign$2 = /*@__PURE__*/ requireAssign$1();
	return assign$2;
}

var assignExports = requireAssign();
var _Object$assign = /*@__PURE__*/getDefaultExportFromCjs(assignExports);

var es_array_includes = {};

var hasRequiredEs_array_includes;

function requireEs_array_includes () {
	if (hasRequiredEs_array_includes) return es_array_includes;
	hasRequiredEs_array_includes = 1;
	var $ = /*@__PURE__*/ require_export();
	var $includes = /*@__PURE__*/ requireArrayIncludes().includes;
	var fails = /*@__PURE__*/ requireFails();
	var addToUnscopables = /*@__PURE__*/ requireAddToUnscopables();

	// FF99+ bug
	var BROKEN_ON_SPARSE = fails(function () {
	  // eslint-disable-next-line es/no-array-prototype-includes -- detection
	  return !Array(1).includes();
	});

	// `Array.prototype.includes` method
	// https://tc39.es/ecma262/#sec-array.prototype.includes
	$({ target: 'Array', proto: true, forced: BROKEN_ON_SPARSE }, {
	  includes: function includes(el /* , fromIndex = 0 */) {
	    return $includes(this, el, arguments.length > 1 ? arguments[1] : undefined);
	  }
	});

	// https://tc39.es/ecma262/#sec-array.prototype-@@unscopables
	addToUnscopables('includes');
	return es_array_includes;
}

var includes$4;
var hasRequiredIncludes$4;

function requireIncludes$4 () {
	if (hasRequiredIncludes$4) return includes$4;
	hasRequiredIncludes$4 = 1;
	requireEs_array_includes();
	var getBuiltInPrototypeMethod = /*@__PURE__*/ requireGetBuiltInPrototypeMethod();

	includes$4 = getBuiltInPrototypeMethod('Array', 'includes');
	return includes$4;
}

var es_string_includes = {};

var isRegexp;
var hasRequiredIsRegexp;

function requireIsRegexp () {
	if (hasRequiredIsRegexp) return isRegexp;
	hasRequiredIsRegexp = 1;
	var isObject = /*@__PURE__*/ requireIsObject();
	var classof = /*@__PURE__*/ requireClassofRaw();
	var wellKnownSymbol = /*@__PURE__*/ requireWellKnownSymbol();

	var MATCH = wellKnownSymbol('match');

	// `IsRegExp` abstract operation
	// https://tc39.es/ecma262/#sec-isregexp
	isRegexp = function (it) {
	  var isRegExp;
	  return isObject(it) && ((isRegExp = it[MATCH]) !== undefined ? !!isRegExp : classof(it) === 'RegExp');
	};
	return isRegexp;
}

var notARegexp;
var hasRequiredNotARegexp;

function requireNotARegexp () {
	if (hasRequiredNotARegexp) return notARegexp;
	hasRequiredNotARegexp = 1;
	var isRegExp = /*@__PURE__*/ requireIsRegexp();

	var $TypeError = TypeError;

	notARegexp = function (it) {
	  if (isRegExp(it)) {
	    throw new $TypeError("The method doesn't accept regular expressions");
	  } return it;
	};
	return notARegexp;
}

var correctIsRegexpLogic;
var hasRequiredCorrectIsRegexpLogic;

function requireCorrectIsRegexpLogic () {
	if (hasRequiredCorrectIsRegexpLogic) return correctIsRegexpLogic;
	hasRequiredCorrectIsRegexpLogic = 1;
	var wellKnownSymbol = /*@__PURE__*/ requireWellKnownSymbol();

	var MATCH = wellKnownSymbol('match');

	correctIsRegexpLogic = function (METHOD_NAME) {
	  var regexp = /./;
	  try {
	    '/./'[METHOD_NAME](regexp);
	  } catch (error1) {
	    try {
	      regexp[MATCH] = false;
	      return '/./'[METHOD_NAME](regexp);
	    } catch (error2) { /* empty */ }
	  } return false;
	};
	return correctIsRegexpLogic;
}

var hasRequiredEs_string_includes;

function requireEs_string_includes () {
	if (hasRequiredEs_string_includes) return es_string_includes;
	hasRequiredEs_string_includes = 1;
	var $ = /*@__PURE__*/ require_export();
	var uncurryThis = /*@__PURE__*/ requireFunctionUncurryThis();
	var notARegExp = /*@__PURE__*/ requireNotARegexp();
	var requireObjectCoercible = /*@__PURE__*/ requireRequireObjectCoercible();
	var toString = /*@__PURE__*/ requireToString();
	var correctIsRegExpLogic = /*@__PURE__*/ requireCorrectIsRegexpLogic();

	var stringIndexOf = uncurryThis(''.indexOf);

	// `String.prototype.includes` method
	// https://tc39.es/ecma262/#sec-string.prototype.includes
	$({ target: 'String', proto: true, forced: !correctIsRegExpLogic('includes') }, {
	  includes: function includes(searchString /* , position = 0 */) {
	    return !!~stringIndexOf(
	      toString(requireObjectCoercible(this)),
	      toString(notARegExp(searchString)),
	      arguments.length > 1 ? arguments[1] : undefined
	    );
	  }
	});
	return es_string_includes;
}

var includes$3;
var hasRequiredIncludes$3;

function requireIncludes$3 () {
	if (hasRequiredIncludes$3) return includes$3;
	hasRequiredIncludes$3 = 1;
	requireEs_string_includes();
	var getBuiltInPrototypeMethod = /*@__PURE__*/ requireGetBuiltInPrototypeMethod();

	includes$3 = getBuiltInPrototypeMethod('String', 'includes');
	return includes$3;
}

var includes$2;
var hasRequiredIncludes$2;

function requireIncludes$2 () {
	if (hasRequiredIncludes$2) return includes$2;
	hasRequiredIncludes$2 = 1;
	var isPrototypeOf = /*@__PURE__*/ requireObjectIsPrototypeOf();
	var arrayMethod = /*@__PURE__*/ requireIncludes$4();
	var stringMethod = /*@__PURE__*/ requireIncludes$3();

	var ArrayPrototype = Array.prototype;
	var StringPrototype = String.prototype;

	includes$2 = function (it) {
	  var own = it.includes;
	  if (it === ArrayPrototype || (isPrototypeOf(ArrayPrototype, it) && own === ArrayPrototype.includes)) return arrayMethod;
	  if (typeof it == 'string' || it === StringPrototype || (isPrototypeOf(StringPrototype, it) && own === StringPrototype.includes)) {
	    return stringMethod;
	  } return own;
	};
	return includes$2;
}

var includes$1;
var hasRequiredIncludes$1;

function requireIncludes$1 () {
	if (hasRequiredIncludes$1) return includes$1;
	hasRequiredIncludes$1 = 1;
	var parent = /*@__PURE__*/ requireIncludes$2();

	includes$1 = parent;
	return includes$1;
}

var includes;
var hasRequiredIncludes;

function requireIncludes () {
	if (hasRequiredIncludes) return includes;
	hasRequiredIncludes = 1;
	includes = /*@__PURE__*/ requireIncludes$1();
	return includes;
}

var includesExports = requireIncludes();
var _includesInstanceProperty = /*@__PURE__*/getDefaultExportFromCjs(includesExports);

var es_object_getPrototypeOf = {};

var hasRequiredEs_object_getPrototypeOf;

function requireEs_object_getPrototypeOf () {
	if (hasRequiredEs_object_getPrototypeOf) return es_object_getPrototypeOf;
	hasRequiredEs_object_getPrototypeOf = 1;
	var $ = /*@__PURE__*/ require_export();
	var fails = /*@__PURE__*/ requireFails();
	var toObject = /*@__PURE__*/ requireToObject();
	var nativeGetPrototypeOf = /*@__PURE__*/ requireObjectGetPrototypeOf();
	var CORRECT_PROTOTYPE_GETTER = /*@__PURE__*/ requireCorrectPrototypeGetter();

	var FAILS_ON_PRIMITIVES = fails(function () { nativeGetPrototypeOf(1); });

	// `Object.getPrototypeOf` method
	// https://tc39.es/ecma262/#sec-object.getprototypeof
	$({ target: 'Object', stat: true, forced: FAILS_ON_PRIMITIVES, sham: !CORRECT_PROTOTYPE_GETTER }, {
	  getPrototypeOf: function getPrototypeOf(it) {
	    return nativeGetPrototypeOf(toObject(it));
	  }
	});
	return es_object_getPrototypeOf;
}

var getPrototypeOf$2;
var hasRequiredGetPrototypeOf$2;

function requireGetPrototypeOf$2 () {
	if (hasRequiredGetPrototypeOf$2) return getPrototypeOf$2;
	hasRequiredGetPrototypeOf$2 = 1;
	requireEs_object_getPrototypeOf();
	var path = /*@__PURE__*/ requirePath();

	getPrototypeOf$2 = path.Object.getPrototypeOf;
	return getPrototypeOf$2;
}

var getPrototypeOf$1;
var hasRequiredGetPrototypeOf$1;

function requireGetPrototypeOf$1 () {
	if (hasRequiredGetPrototypeOf$1) return getPrototypeOf$1;
	hasRequiredGetPrototypeOf$1 = 1;
	var parent = /*@__PURE__*/ requireGetPrototypeOf$2();

	getPrototypeOf$1 = parent;
	return getPrototypeOf$1;
}

var getPrototypeOf;
var hasRequiredGetPrototypeOf;

function requireGetPrototypeOf () {
	if (hasRequiredGetPrototypeOf) return getPrototypeOf;
	hasRequiredGetPrototypeOf = 1;
	getPrototypeOf = /*@__PURE__*/ requireGetPrototypeOf$1();
	return getPrototypeOf;
}

var getPrototypeOfExports = requireGetPrototypeOf();
var _Object$getPrototypeOf = /*@__PURE__*/getDefaultExportFromCjs(getPrototypeOfExports);

var concat$3;
var hasRequiredConcat$3;

function requireConcat$3 () {
	if (hasRequiredConcat$3) return concat$3;
	hasRequiredConcat$3 = 1;
	requireEs_array_concat();
	var getBuiltInPrototypeMethod = /*@__PURE__*/ requireGetBuiltInPrototypeMethod();

	concat$3 = getBuiltInPrototypeMethod('Array', 'concat');
	return concat$3;
}

var concat$2;
var hasRequiredConcat$2;

function requireConcat$2 () {
	if (hasRequiredConcat$2) return concat$2;
	hasRequiredConcat$2 = 1;
	var isPrototypeOf = /*@__PURE__*/ requireObjectIsPrototypeOf();
	var method = /*@__PURE__*/ requireConcat$3();

	var ArrayPrototype = Array.prototype;

	concat$2 = function (it) {
	  var own = it.concat;
	  return it === ArrayPrototype || (isPrototypeOf(ArrayPrototype, it) && own === ArrayPrototype.concat) ? method : own;
	};
	return concat$2;
}

var concat$1;
var hasRequiredConcat$1;

function requireConcat$1 () {
	if (hasRequiredConcat$1) return concat$1;
	hasRequiredConcat$1 = 1;
	var parent = /*@__PURE__*/ requireConcat$2();

	concat$1 = parent;
	return concat$1;
}

var concat;
var hasRequiredConcat;

function requireConcat () {
	if (hasRequiredConcat) return concat;
	hasRequiredConcat = 1;
	concat = /*@__PURE__*/ requireConcat$1();
	return concat;
}

var concatExports = requireConcat();
var _concatInstanceProperty = /*@__PURE__*/getDefaultExportFromCjs(concatExports);

var es_object_values = {};

var objectToArray;
var hasRequiredObjectToArray;

function requireObjectToArray () {
	if (hasRequiredObjectToArray) return objectToArray;
	hasRequiredObjectToArray = 1;
	var DESCRIPTORS = /*@__PURE__*/ requireDescriptors();
	var fails = /*@__PURE__*/ requireFails();
	var uncurryThis = /*@__PURE__*/ requireFunctionUncurryThis();
	var objectGetPrototypeOf = /*@__PURE__*/ requireObjectGetPrototypeOf();
	var objectKeys = /*@__PURE__*/ requireObjectKeys();
	var toIndexedObject = /*@__PURE__*/ requireToIndexedObject();
	var $propertyIsEnumerable = /*@__PURE__*/ requireObjectPropertyIsEnumerable().f;

	var propertyIsEnumerable = uncurryThis($propertyIsEnumerable);
	var push = uncurryThis([].push);

	// in some IE versions, `propertyIsEnumerable` returns incorrect result on integer keys
	// of `null` prototype objects
	var IE_BUG = DESCRIPTORS && fails(function () {
	  // eslint-disable-next-line es/no-object-create -- safe
	  var O = Object.create(null);
	  O[2] = 2;
	  return !propertyIsEnumerable(O, 2);
	});

	// `Object.{ entries, values }` methods implementation
	var createMethod = function (TO_ENTRIES) {
	  return function (it) {
	    var O = toIndexedObject(it);
	    var keys = objectKeys(O);
	    var IE_WORKAROUND = IE_BUG && objectGetPrototypeOf(O) === null;
	    var length = keys.length;
	    var i = 0;
	    var result = [];
	    var key;
	    while (length > i) {
	      key = keys[i++];
	      if (!DESCRIPTORS || (IE_WORKAROUND ? key in O : propertyIsEnumerable(O, key))) {
	        push(result, TO_ENTRIES ? [key, O[key]] : O[key]);
	      }
	    }
	    return result;
	  };
	};

	objectToArray = {
	  // `Object.entries` method
	  // https://tc39.es/ecma262/#sec-object.entries
	  entries: createMethod(true),
	  // `Object.values` method
	  // https://tc39.es/ecma262/#sec-object.values
	  values: createMethod(false)
	};
	return objectToArray;
}

var hasRequiredEs_object_values;

function requireEs_object_values () {
	if (hasRequiredEs_object_values) return es_object_values;
	hasRequiredEs_object_values = 1;
	var $ = /*@__PURE__*/ require_export();
	var $values = /*@__PURE__*/ requireObjectToArray().values;

	// `Object.values` method
	// https://tc39.es/ecma262/#sec-object.values
	$({ target: 'Object', stat: true }, {
	  values: function values(O) {
	    return $values(O);
	  }
	});
	return es_object_values;
}

var values$2;
var hasRequiredValues$2;

function requireValues$2 () {
	if (hasRequiredValues$2) return values$2;
	hasRequiredValues$2 = 1;
	requireEs_object_values();
	var path = /*@__PURE__*/ requirePath();

	values$2 = path.Object.values;
	return values$2;
}

var values$1;
var hasRequiredValues$1;

function requireValues$1 () {
	if (hasRequiredValues$1) return values$1;
	hasRequiredValues$1 = 1;
	var parent = /*@__PURE__*/ requireValues$2();

	values$1 = parent;
	return values$1;
}

var values;
var hasRequiredValues;

function requireValues () {
	if (hasRequiredValues) return values;
	hasRequiredValues = 1;
	values = /*@__PURE__*/ requireValues$1();
	return values;
}

var valuesExports = requireValues();
var _Object$values = /*@__PURE__*/getDefaultExportFromCjs(valuesExports);

var es_parseInt = {};

var whitespaces;
var hasRequiredWhitespaces;

function requireWhitespaces () {
	if (hasRequiredWhitespaces) return whitespaces;
	hasRequiredWhitespaces = 1;
	// a string of all valid unicode whitespaces
	whitespaces = '\u0009\u000A\u000B\u000C\u000D\u0020\u00A0\u1680\u2000\u2001\u2002' +
	  '\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200A\u202F\u205F\u3000\u2028\u2029\uFEFF';
	return whitespaces;
}

var stringTrim;
var hasRequiredStringTrim;

function requireStringTrim () {
	if (hasRequiredStringTrim) return stringTrim;
	hasRequiredStringTrim = 1;
	var uncurryThis = /*@__PURE__*/ requireFunctionUncurryThis();
	var requireObjectCoercible = /*@__PURE__*/ requireRequireObjectCoercible();
	var toString = /*@__PURE__*/ requireToString();
	var whitespaces = /*@__PURE__*/ requireWhitespaces();

	var replace = uncurryThis(''.replace);
	var ltrim = RegExp('^[' + whitespaces + ']+');
	var rtrim = RegExp('(^|[^' + whitespaces + '])[' + whitespaces + ']+$');

	// `String.prototype.{ trim, trimStart, trimEnd, trimLeft, trimRight }` methods implementation
	var createMethod = function (TYPE) {
	  return function ($this) {
	    var string = toString(requireObjectCoercible($this));
	    if (TYPE & 1) string = replace(string, ltrim, '');
	    if (TYPE & 2) string = replace(string, rtrim, '$1');
	    return string;
	  };
	};

	stringTrim = {
	  // `String.prototype.{ trimLeft, trimStart }` methods
	  // https://tc39.es/ecma262/#sec-string.prototype.trimstart
	  start: createMethod(1),
	  // `String.prototype.{ trimRight, trimEnd }` methods
	  // https://tc39.es/ecma262/#sec-string.prototype.trimend
	  end: createMethod(2),
	  // `String.prototype.trim` method
	  // https://tc39.es/ecma262/#sec-string.prototype.trim
	  trim: createMethod(3)
	};
	return stringTrim;
}

var numberParseInt;
var hasRequiredNumberParseInt;

function requireNumberParseInt () {
	if (hasRequiredNumberParseInt) return numberParseInt;
	hasRequiredNumberParseInt = 1;
	var globalThis = /*@__PURE__*/ requireGlobalThis();
	var fails = /*@__PURE__*/ requireFails();
	var uncurryThis = /*@__PURE__*/ requireFunctionUncurryThis();
	var toString = /*@__PURE__*/ requireToString();
	var trim = /*@__PURE__*/ requireStringTrim().trim;
	var whitespaces = /*@__PURE__*/ requireWhitespaces();

	var $parseInt = globalThis.parseInt;
	var Symbol = globalThis.Symbol;
	var ITERATOR = Symbol && Symbol.iterator;
	var hex = /^[+-]?0x/i;
	var exec = uncurryThis(hex.exec);
	var FORCED = $parseInt(whitespaces + '08') !== 8 || $parseInt(whitespaces + '0x16') !== 22
	  // MS Edge 18- broken with boxed symbols
	  || (ITERATOR && !fails(function () { $parseInt(Object(ITERATOR)); }));

	// `parseInt` method
	// https://tc39.es/ecma262/#sec-parseint-string-radix
	numberParseInt = FORCED ? function parseInt(string, radix) {
	  var S = trim(toString(string));
	  return $parseInt(S, (radix >>> 0) || (exec(hex, S) ? 16 : 10));
	} : $parseInt;
	return numberParseInt;
}

var hasRequiredEs_parseInt;

function requireEs_parseInt () {
	if (hasRequiredEs_parseInt) return es_parseInt;
	hasRequiredEs_parseInt = 1;
	var $ = /*@__PURE__*/ require_export();
	var $parseInt = /*@__PURE__*/ requireNumberParseInt();

	// `parseInt` method
	// https://tc39.es/ecma262/#sec-parseint-string-radix
	$({ global: true, forced: parseInt !== $parseInt }, {
	  parseInt: $parseInt
	});
	return es_parseInt;
}

var _parseInt$3;
var hasRequired_parseInt$2;

function require_parseInt$2 () {
	if (hasRequired_parseInt$2) return _parseInt$3;
	hasRequired_parseInt$2 = 1;
	requireEs_parseInt();
	var path = /*@__PURE__*/ requirePath();

	_parseInt$3 = path.parseInt;
	return _parseInt$3;
}

var _parseInt$2;
var hasRequired_parseInt$1;

function require_parseInt$1 () {
	if (hasRequired_parseInt$1) return _parseInt$2;
	hasRequired_parseInt$1 = 1;
	var parent = /*@__PURE__*/ require_parseInt$2();

	_parseInt$2 = parent;
	return _parseInt$2;
}

var _parseInt$1;
var hasRequired_parseInt;

function require_parseInt () {
	if (hasRequired_parseInt) return _parseInt$1;
	hasRequired_parseInt = 1;
	_parseInt$1 = /*@__PURE__*/ require_parseInt$1();
	return _parseInt$1;
}

var _parseIntExports = require_parseInt();
var _parseInt = /*@__PURE__*/getDefaultExportFromCjs(_parseIntExports);

var es_array_indexOf = {};

var hasRequiredEs_array_indexOf;

function requireEs_array_indexOf () {
	if (hasRequiredEs_array_indexOf) return es_array_indexOf;
	hasRequiredEs_array_indexOf = 1;
	/* eslint-disable es/no-array-prototype-indexof -- required for testing */
	var $ = /*@__PURE__*/ require_export();
	var uncurryThis = /*@__PURE__*/ requireFunctionUncurryThisClause();
	var $indexOf = /*@__PURE__*/ requireArrayIncludes().indexOf;
	var arrayMethodIsStrict = /*@__PURE__*/ requireArrayMethodIsStrict();

	var nativeIndexOf = uncurryThis([].indexOf);

	var NEGATIVE_ZERO = !!nativeIndexOf && 1 / nativeIndexOf([1], 1, -0) < 0;
	var FORCED = NEGATIVE_ZERO || !arrayMethodIsStrict('indexOf');

	// `Array.prototype.indexOf` method
	// https://tc39.es/ecma262/#sec-array.prototype.indexof
	$({ target: 'Array', proto: true, forced: FORCED }, {
	  indexOf: function indexOf(searchElement /* , fromIndex = 0 */) {
	    var fromIndex = arguments.length > 1 ? arguments[1] : undefined;
	    return NEGATIVE_ZERO
	      // convert -0 to +0
	      ? nativeIndexOf(this, searchElement, fromIndex) || 0
	      : $indexOf(this, searchElement, fromIndex);
	  }
	});
	return es_array_indexOf;
}

var indexOf$3;
var hasRequiredIndexOf$3;

function requireIndexOf$3 () {
	if (hasRequiredIndexOf$3) return indexOf$3;
	hasRequiredIndexOf$3 = 1;
	requireEs_array_indexOf();
	var getBuiltInPrototypeMethod = /*@__PURE__*/ requireGetBuiltInPrototypeMethod();

	indexOf$3 = getBuiltInPrototypeMethod('Array', 'indexOf');
	return indexOf$3;
}

var indexOf$2;
var hasRequiredIndexOf$2;

function requireIndexOf$2 () {
	if (hasRequiredIndexOf$2) return indexOf$2;
	hasRequiredIndexOf$2 = 1;
	var isPrototypeOf = /*@__PURE__*/ requireObjectIsPrototypeOf();
	var method = /*@__PURE__*/ requireIndexOf$3();

	var ArrayPrototype = Array.prototype;

	indexOf$2 = function (it) {
	  var own = it.indexOf;
	  return it === ArrayPrototype || (isPrototypeOf(ArrayPrototype, it) && own === ArrayPrototype.indexOf) ? method : own;
	};
	return indexOf$2;
}

var indexOf$1;
var hasRequiredIndexOf$1;

function requireIndexOf$1 () {
	if (hasRequiredIndexOf$1) return indexOf$1;
	hasRequiredIndexOf$1 = 1;
	var parent = /*@__PURE__*/ requireIndexOf$2();

	indexOf$1 = parent;
	return indexOf$1;
}

var indexOf;
var hasRequiredIndexOf;

function requireIndexOf () {
	if (hasRequiredIndexOf) return indexOf;
	hasRequiredIndexOf = 1;
	indexOf = /*@__PURE__*/ requireIndexOf$1();
	return indexOf;
}

var indexOfExports = requireIndexOf();
var _indexOfInstanceProperty = /*@__PURE__*/getDefaultExportFromCjs(indexOfExports);

var es_object_entries = {};

var hasRequiredEs_object_entries;

function requireEs_object_entries () {
	if (hasRequiredEs_object_entries) return es_object_entries;
	hasRequiredEs_object_entries = 1;
	var $ = /*@__PURE__*/ require_export();
	var $entries = /*@__PURE__*/ requireObjectToArray().entries;

	// `Object.entries` method
	// https://tc39.es/ecma262/#sec-object.entries
	$({ target: 'Object', stat: true }, {
	  entries: function entries(O) {
	    return $entries(O);
	  }
	});
	return es_object_entries;
}

var entries$2;
var hasRequiredEntries$2;

function requireEntries$2 () {
	if (hasRequiredEntries$2) return entries$2;
	hasRequiredEntries$2 = 1;
	requireEs_object_entries();
	var path = /*@__PURE__*/ requirePath();

	entries$2 = path.Object.entries;
	return entries$2;
}

var entries$1;
var hasRequiredEntries$1;

function requireEntries$1 () {
	if (hasRequiredEntries$1) return entries$1;
	hasRequiredEntries$1 = 1;
	var parent = /*@__PURE__*/ requireEntries$2();

	entries$1 = parent;
	return entries$1;
}

var entries;
var hasRequiredEntries;

function requireEntries () {
	if (hasRequiredEntries) return entries;
	hasRequiredEntries = 1;
	entries = /*@__PURE__*/ requireEntries$1();
	return entries;
}

var entriesExports = requireEntries();
var _Object$entries = /*@__PURE__*/getDefaultExportFromCjs(entriesExports);

var es_object_create = {};

var hasRequiredEs_object_create;

function requireEs_object_create () {
	if (hasRequiredEs_object_create) return es_object_create;
	hasRequiredEs_object_create = 1;
	// TODO: Remove from `core-js@4`
	var $ = /*@__PURE__*/ require_export();
	var DESCRIPTORS = /*@__PURE__*/ requireDescriptors();
	var create = /*@__PURE__*/ requireObjectCreate();

	// `Object.create` method
	// https://tc39.es/ecma262/#sec-object.create
	$({ target: 'Object', stat: true, sham: !DESCRIPTORS }, {
	  create: create
	});
	return es_object_create;
}

var create$2;
var hasRequiredCreate$2;

function requireCreate$2 () {
	if (hasRequiredCreate$2) return create$2;
	hasRequiredCreate$2 = 1;
	requireEs_object_create();
	var path = /*@__PURE__*/ requirePath();

	var Object = path.Object;

	create$2 = function create(P, D) {
	  return Object.create(P, D);
	};
	return create$2;
}

var create$1;
var hasRequiredCreate$1;

function requireCreate$1 () {
	if (hasRequiredCreate$1) return create$1;
	hasRequiredCreate$1 = 1;
	var parent = /*@__PURE__*/ requireCreate$2();

	create$1 = parent;
	return create$1;
}

var create;
var hasRequiredCreate;

function requireCreate () {
	if (hasRequiredCreate) return create;
	hasRequiredCreate = 1;
	create = /*@__PURE__*/ requireCreate$1();
	return create;
}

var createExports = requireCreate();
var _Object$create = /*@__PURE__*/getDefaultExportFromCjs(createExports);

var es_date_toJson = {};

var stringRepeat;
var hasRequiredStringRepeat;

function requireStringRepeat () {
	if (hasRequiredStringRepeat) return stringRepeat;
	hasRequiredStringRepeat = 1;
	var toIntegerOrInfinity = /*@__PURE__*/ requireToIntegerOrInfinity();
	var toString = /*@__PURE__*/ requireToString();
	var requireObjectCoercible = /*@__PURE__*/ requireRequireObjectCoercible();

	var $RangeError = RangeError;

	// `String.prototype.repeat` method implementation
	// https://tc39.es/ecma262/#sec-string.prototype.repeat
	stringRepeat = function repeat(count) {
	  var str = toString(requireObjectCoercible(this));
	  var result = '';
	  var n = toIntegerOrInfinity(count);
	  if (n < 0 || n === Infinity) throw new $RangeError('Wrong number of repetitions');
	  for (;n > 0; (n >>>= 1) && (str += str)) if (n & 1) result += str;
	  return result;
	};
	return stringRepeat;
}

var stringPad;
var hasRequiredStringPad;

function requireStringPad () {
	if (hasRequiredStringPad) return stringPad;
	hasRequiredStringPad = 1;
	var uncurryThis = /*@__PURE__*/ requireFunctionUncurryThis();
	var toLength = /*@__PURE__*/ requireToLength();
	var toString = /*@__PURE__*/ requireToString();
	var $repeat = /*@__PURE__*/ requireStringRepeat();
	var requireObjectCoercible = /*@__PURE__*/ requireRequireObjectCoercible();

	var repeat = uncurryThis($repeat);
	var stringSlice = uncurryThis(''.slice);
	var ceil = Math.ceil;

	// `String.prototype.{ padStart, padEnd }` methods implementation
	var createMethod = function (IS_END) {
	  return function ($this, maxLength, fillString) {
	    var S = toString(requireObjectCoercible($this));
	    var intMaxLength = toLength(maxLength);
	    var stringLength = S.length;
	    var fillStr = fillString === undefined ? ' ' : toString(fillString);
	    var fillLen, stringFiller;
	    if (intMaxLength <= stringLength || fillStr === '') return S;
	    fillLen = intMaxLength - stringLength;
	    stringFiller = repeat(fillStr, ceil(fillLen / fillStr.length));
	    if (stringFiller.length > fillLen) stringFiller = stringSlice(stringFiller, 0, fillLen);
	    return IS_END ? S + stringFiller : stringFiller + S;
	  };
	};

	stringPad = {
	  // `String.prototype.padStart` method
	  // https://tc39.es/ecma262/#sec-string.prototype.padstart
	  start: createMethod(false),
	  // `String.prototype.padEnd` method
	  // https://tc39.es/ecma262/#sec-string.prototype.padend
	  end: createMethod(true)
	};
	return stringPad;
}

var dateToIsoString;
var hasRequiredDateToIsoString;

function requireDateToIsoString () {
	if (hasRequiredDateToIsoString) return dateToIsoString;
	hasRequiredDateToIsoString = 1;
	var uncurryThis = /*@__PURE__*/ requireFunctionUncurryThis();
	var fails = /*@__PURE__*/ requireFails();
	var padStart = /*@__PURE__*/ requireStringPad().start;

	var $RangeError = RangeError;
	var $isFinite = isFinite;
	var abs = Math.abs;
	var DatePrototype = Date.prototype;
	var nativeDateToISOString = DatePrototype.toISOString;
	var thisTimeValue = uncurryThis(DatePrototype.getTime);
	var getUTCDate = uncurryThis(DatePrototype.getUTCDate);
	var getUTCFullYear = uncurryThis(DatePrototype.getUTCFullYear);
	var getUTCHours = uncurryThis(DatePrototype.getUTCHours);
	var getUTCMilliseconds = uncurryThis(DatePrototype.getUTCMilliseconds);
	var getUTCMinutes = uncurryThis(DatePrototype.getUTCMinutes);
	var getUTCMonth = uncurryThis(DatePrototype.getUTCMonth);
	var getUTCSeconds = uncurryThis(DatePrototype.getUTCSeconds);

	// `Date.prototype.toISOString` method implementation
	// https://tc39.es/ecma262/#sec-date.prototype.toisostring
	// PhantomJS / old WebKit fails here:
	dateToIsoString = (fails(function () {
	  return nativeDateToISOString.call(new Date(-5e13 - 1)) !== '0385-07-25T07:06:39.999Z';
	}) || !fails(function () {
	  nativeDateToISOString.call(new Date(NaN));
	})) ? function toISOString() {
	  if (!$isFinite(thisTimeValue(this))) throw new $RangeError('Invalid time value');
	  var date = this;
	  var year = getUTCFullYear(date);
	  var milliseconds = getUTCMilliseconds(date);
	  var sign = year < 0 ? '-' : year > 9999 ? '+' : '';
	  return sign + padStart(abs(year), sign ? 6 : 4, 0) +
	    '-' + padStart(getUTCMonth(date) + 1, 2, 0) +
	    '-' + padStart(getUTCDate(date), 2, 0) +
	    'T' + padStart(getUTCHours(date), 2, 0) +
	    ':' + padStart(getUTCMinutes(date), 2, 0) +
	    ':' + padStart(getUTCSeconds(date), 2, 0) +
	    '.' + padStart(milliseconds, 3, 0) +
	    'Z';
	} : nativeDateToISOString;
	return dateToIsoString;
}

var hasRequiredEs_date_toJson;

function requireEs_date_toJson () {
	if (hasRequiredEs_date_toJson) return es_date_toJson;
	hasRequiredEs_date_toJson = 1;
	var $ = /*@__PURE__*/ require_export();
	var call = /*@__PURE__*/ requireFunctionCall();
	var toObject = /*@__PURE__*/ requireToObject();
	var toPrimitive = /*@__PURE__*/ requireToPrimitive$5();
	var toISOString = /*@__PURE__*/ requireDateToIsoString();
	var classof = /*@__PURE__*/ requireClassofRaw();
	var fails = /*@__PURE__*/ requireFails();

	var FORCED = fails(function () {
	  return new Date(NaN).toJSON() !== null
	    || call(Date.prototype.toJSON, { toISOString: function () { return 1; } }) !== 1;
	});

	// `Date.prototype.toJSON` method
	// https://tc39.es/ecma262/#sec-date.prototype.tojson
	$({ target: 'Date', proto: true, forced: FORCED }, {
	  // eslint-disable-next-line no-unused-vars -- required for `.length`
	  toJSON: function toJSON(key) {
	    var O = toObject(this);
	    var pv = toPrimitive(O, 'number');
	    return typeof pv == 'number' && !isFinite(pv) ? null :
	      (!('toISOString' in O) && classof(O) === 'Date') ? call(toISOString, O) : O.toISOString();
	  }
	});
	return es_date_toJson;
}

var stringify$2;
var hasRequiredStringify$2;

function requireStringify$2 () {
	if (hasRequiredStringify$2) return stringify$2;
	hasRequiredStringify$2 = 1;
	requireEs_date_toJson();
	requireEs_json_stringify();
	var path = /*@__PURE__*/ requirePath();
	var apply = /*@__PURE__*/ requireFunctionApply();

	// eslint-disable-next-line es/no-json -- safe
	if (!path.JSON) path.JSON = { stringify: JSON.stringify };

	// eslint-disable-next-line no-unused-vars -- required for `.length`
	stringify$2 = function stringify(it, replacer, space) {
	  return apply(path.JSON.stringify, null, arguments);
	};
	return stringify$2;
}

var stringify$1;
var hasRequiredStringify$1;

function requireStringify$1 () {
	if (hasRequiredStringify$1) return stringify$1;
	hasRequiredStringify$1 = 1;
	var parent = /*@__PURE__*/ requireStringify$2();

	stringify$1 = parent;
	return stringify$1;
}

var stringify;
var hasRequiredStringify;

function requireStringify () {
	if (hasRequiredStringify) return stringify;
	hasRequiredStringify = 1;
	stringify = /*@__PURE__*/ requireStringify$1();
	return stringify;
}

var stringifyExports = requireStringify();
var _JSON$stringify = /*@__PURE__*/getDefaultExportFromCjs(stringifyExports);

var es_array_fill = {};

var arrayFill;
var hasRequiredArrayFill;

function requireArrayFill () {
	if (hasRequiredArrayFill) return arrayFill;
	hasRequiredArrayFill = 1;
	var toObject = /*@__PURE__*/ requireToObject();
	var toAbsoluteIndex = /*@__PURE__*/ requireToAbsoluteIndex();
	var lengthOfArrayLike = /*@__PURE__*/ requireLengthOfArrayLike();

	// `Array.prototype.fill` method implementation
	// https://tc39.es/ecma262/#sec-array.prototype.fill
	arrayFill = function fill(value /* , start = 0, end = @length */) {
	  var O = toObject(this);
	  var length = lengthOfArrayLike(O);
	  var argumentsLength = arguments.length;
	  var index = toAbsoluteIndex(argumentsLength > 1 ? arguments[1] : undefined, length);
	  var end = argumentsLength > 2 ? arguments[2] : undefined;
	  var endPos = end === undefined ? length : toAbsoluteIndex(end, length);
	  while (endPos > index) O[index++] = value;
	  return O;
	};
	return arrayFill;
}

var hasRequiredEs_array_fill;

function requireEs_array_fill () {
	if (hasRequiredEs_array_fill) return es_array_fill;
	hasRequiredEs_array_fill = 1;
	var $ = /*@__PURE__*/ require_export();
	var fill = /*@__PURE__*/ requireArrayFill();
	var addToUnscopables = /*@__PURE__*/ requireAddToUnscopables();

	// `Array.prototype.fill` method
	// https://tc39.es/ecma262/#sec-array.prototype.fill
	$({ target: 'Array', proto: true }, {
	  fill: fill
	});

	// https://tc39.es/ecma262/#sec-array.prototype-@@unscopables
	addToUnscopables('fill');
	return es_array_fill;
}

var fill$3;
var hasRequiredFill$3;

function requireFill$3 () {
	if (hasRequiredFill$3) return fill$3;
	hasRequiredFill$3 = 1;
	requireEs_array_fill();
	var getBuiltInPrototypeMethod = /*@__PURE__*/ requireGetBuiltInPrototypeMethod();

	fill$3 = getBuiltInPrototypeMethod('Array', 'fill');
	return fill$3;
}

var fill$2;
var hasRequiredFill$2;

function requireFill$2 () {
	if (hasRequiredFill$2) return fill$2;
	hasRequiredFill$2 = 1;
	var isPrototypeOf = /*@__PURE__*/ requireObjectIsPrototypeOf();
	var method = /*@__PURE__*/ requireFill$3();

	var ArrayPrototype = Array.prototype;

	fill$2 = function (it) {
	  var own = it.fill;
	  return it === ArrayPrototype || (isPrototypeOf(ArrayPrototype, it) && own === ArrayPrototype.fill) ? method : own;
	};
	return fill$2;
}

var fill$1;
var hasRequiredFill$1;

function requireFill$1 () {
	if (hasRequiredFill$1) return fill$1;
	hasRequiredFill$1 = 1;
	var parent = /*@__PURE__*/ requireFill$2();

	fill$1 = parent;
	return fill$1;
}

var fill;
var hasRequiredFill;

function requireFill () {
	if (hasRequiredFill) return fill;
	hasRequiredFill = 1;
	fill = /*@__PURE__*/ requireFill$1();
	return fill;
}

var fillExports = requireFill();
var _fillInstanceProperty = /*@__PURE__*/getDefaultExportFromCjs(fillExports);

var componentEmitter = {exports: {}};

var hasRequiredComponentEmitter;

function requireComponentEmitter () {
	if (hasRequiredComponentEmitter) return componentEmitter.exports;
	hasRequiredComponentEmitter = 1;
	(function (module) {
		/**
		 * Expose `Emitter`.
		 */

		{
		  module.exports = Emitter;
		}

		/**
		 * Initialize a new `Emitter`.
		 *
		 * @api public
		 */

		function Emitter(obj) {
		  if (obj) return mixin(obj);
		}
		/**
		 * Mixin the emitter properties.
		 *
		 * @param {Object} obj
		 * @return {Object}
		 * @api private
		 */

		function mixin(obj) {
		  for (var key in Emitter.prototype) {
		    obj[key] = Emitter.prototype[key];
		  }
		  return obj;
		}

		/**
		 * Listen on the given `event` with `fn`.
		 *
		 * @param {String} event
		 * @param {Function} fn
		 * @return {Emitter}
		 * @api public
		 */

		Emitter.prototype.on =
		Emitter.prototype.addEventListener = function(event, fn){
		  this._callbacks = this._callbacks || {};
		  (this._callbacks['$' + event] = this._callbacks['$' + event] || [])
		    .push(fn);
		  return this;
		};

		/**
		 * Adds an `event` listener that will be invoked a single
		 * time then automatically removed.
		 *
		 * @param {String} event
		 * @param {Function} fn
		 * @return {Emitter}
		 * @api public
		 */

		Emitter.prototype.once = function(event, fn){
		  function on() {
		    this.off(event, on);
		    fn.apply(this, arguments);
		  }

		  on.fn = fn;
		  this.on(event, on);
		  return this;
		};

		/**
		 * Remove the given callback for `event` or all
		 * registered callbacks.
		 *
		 * @param {String} event
		 * @param {Function} fn
		 * @return {Emitter}
		 * @api public
		 */

		Emitter.prototype.off =
		Emitter.prototype.removeListener =
		Emitter.prototype.removeAllListeners =
		Emitter.prototype.removeEventListener = function(event, fn){
		  this._callbacks = this._callbacks || {};

		  // all
		  if (0 == arguments.length) {
		    this._callbacks = {};
		    return this;
		  }

		  // specific event
		  var callbacks = this._callbacks['$' + event];
		  if (!callbacks) return this;

		  // remove all handlers
		  if (1 == arguments.length) {
		    delete this._callbacks['$' + event];
		    return this;
		  }

		  // remove specific handler
		  var cb;
		  for (var i = 0; i < callbacks.length; i++) {
		    cb = callbacks[i];
		    if (cb === fn || cb.fn === fn) {
		      callbacks.splice(i, 1);
		      break;
		    }
		  }

		  // Remove event specific arrays for event types that no
		  // one is subscribed for to avoid memory leak.
		  if (callbacks.length === 0) {
		    delete this._callbacks['$' + event];
		  }

		  return this;
		};

		/**
		 * Emit `event` with the given args.
		 *
		 * @param {String} event
		 * @param {Mixed} ...
		 * @return {Emitter}
		 */

		Emitter.prototype.emit = function(event){
		  this._callbacks = this._callbacks || {};

		  var args = new Array(arguments.length - 1)
		    , callbacks = this._callbacks['$' + event];

		  for (var i = 1; i < arguments.length; i++) {
		    args[i - 1] = arguments[i];
		  }

		  if (callbacks) {
		    callbacks = callbacks.slice(0);
		    for (var i = 0, len = callbacks.length; i < len; ++i) {
		      callbacks[i].apply(this, args);
		    }
		  }

		  return this;
		};

		/**
		 * Return array of callbacks for `event`.
		 *
		 * @param {String} event
		 * @return {Array}
		 * @api public
		 */

		Emitter.prototype.listeners = function(event){
		  this._callbacks = this._callbacks || {};
		  return this._callbacks['$' + event] || [];
		};

		/**
		 * Check if this emitter has `event` handlers.
		 *
		 * @param {String} event
		 * @return {Boolean}
		 * @api public
		 */

		Emitter.prototype.hasListeners = function(event){
		  return !! this.listeners(event).length;
		}; 
	} (componentEmitter));
	return componentEmitter.exports;
}

var componentEmitterExports = requireComponentEmitter();
var Emitter = /*@__PURE__*/getDefaultExportFromCjs(componentEmitterExports);

/*! Hammer.JS - v2.0.17-rc - 2019-12-16
 * http://naver.github.io/egjs
 *
 * Forked By Naver egjs
 * Copyright (c) hammerjs
 * Licensed under the MIT license */
function _extends() {
  _extends = Object.assign || function (target) {
    for (var i = 1; i < arguments.length; i++) {
      var source = arguments[i];

      for (var key in source) {
        if (Object.prototype.hasOwnProperty.call(source, key)) {
          target[key] = source[key];
        }
      }
    }

    return target;
  };

  return _extends.apply(this, arguments);
}

function _inheritsLoose(subClass, superClass) {
  subClass.prototype = Object.create(superClass.prototype);
  subClass.prototype.constructor = subClass;
  subClass.__proto__ = superClass;
}

function _assertThisInitialized(self) {
  if (self === void 0) {
    throw new ReferenceError("this hasn't been initialised - super() hasn't been called");
  }

  return self;
}

/**
 * @private
 * extend object.
 * means that properties in dest will be overwritten by the ones in src.
 * @param {Object} target
 * @param {...Object} objects_to_assign
 * @returns {Object} target
 */
var assign;

if (typeof Object.assign !== 'function') {
  assign = function assign(target) {
    if (target === undefined || target === null) {
      throw new TypeError('Cannot convert undefined or null to object');
    }

    var output = Object(target);

    for (var index = 1; index < arguments.length; index++) {
      var source = arguments[index];

      if (source !== undefined && source !== null) {
        for (var nextKey in source) {
          if (source.hasOwnProperty(nextKey)) {
            output[nextKey] = source[nextKey];
          }
        }
      }
    }

    return output;
  };
} else {
  assign = Object.assign;
}

var assign$1 = assign;

var VENDOR_PREFIXES = ['', 'webkit', 'Moz', 'MS', 'ms', 'o'];
var TEST_ELEMENT = typeof document === "undefined" ? {
  style: {}
} : document.createElement('div');
var TYPE_FUNCTION = 'function';
var round = Math.round,
    abs = Math.abs;
var now = Date.now;

/**
 * @private
 * get the prefixed property
 * @param {Object} obj
 * @param {String} property
 * @returns {String|Undefined} prefixed
 */

function prefixed(obj, property) {
  var prefix;
  var prop;
  var camelProp = property[0].toUpperCase() + property.slice(1);
  var i = 0;

  while (i < VENDOR_PREFIXES.length) {
    prefix = VENDOR_PREFIXES[i];
    prop = prefix ? prefix + camelProp : property;

    if (prop in obj) {
      return prop;
    }

    i++;
  }

  return undefined;
}

/* eslint-disable no-new-func, no-nested-ternary */
var win;

if (typeof window === "undefined") {
  // window is undefined in node.js
  win = {};
} else {
  win = window;
}

var PREFIXED_TOUCH_ACTION = prefixed(TEST_ELEMENT.style, 'touchAction');
var NATIVE_TOUCH_ACTION = PREFIXED_TOUCH_ACTION !== undefined;
function getTouchActionProps() {
  if (!NATIVE_TOUCH_ACTION) {
    return false;
  }

  var touchMap = {};
  var cssSupports = win.CSS && win.CSS.supports;
  ['auto', 'manipulation', 'pan-y', 'pan-x', 'pan-x pan-y', 'none'].forEach(function (val) {
    // If css.supports is not supported but there is native touch-action assume it supports
    // all values. This is the case for IE 10 and 11.
    return touchMap[val] = cssSupports ? win.CSS.supports('touch-action', val) : true;
  });
  return touchMap;
}

var TOUCH_ACTION_COMPUTE = 'compute';
var TOUCH_ACTION_AUTO = 'auto';
var TOUCH_ACTION_MANIPULATION = 'manipulation'; // not implemented

var TOUCH_ACTION_NONE = 'none';
var TOUCH_ACTION_PAN_X = 'pan-x';
var TOUCH_ACTION_PAN_Y = 'pan-y';
var TOUCH_ACTION_MAP = getTouchActionProps();

var MOBILE_REGEX = /mobile|tablet|ip(ad|hone|od)|android/i;
var SUPPORT_TOUCH = 'ontouchstart' in win;
var SUPPORT_POINTER_EVENTS = prefixed(win, 'PointerEvent') !== undefined;
var SUPPORT_ONLY_TOUCH = SUPPORT_TOUCH && MOBILE_REGEX.test(navigator.userAgent);
var INPUT_TYPE_TOUCH = 'touch';
var INPUT_TYPE_PEN = 'pen';
var INPUT_TYPE_MOUSE = 'mouse';
var INPUT_TYPE_KINECT = 'kinect';
var COMPUTE_INTERVAL = 25;
var INPUT_START = 1;
var INPUT_MOVE = 2;
var INPUT_END = 4;
var INPUT_CANCEL = 8;
var DIRECTION_NONE = 1;
var DIRECTION_LEFT = 2;
var DIRECTION_RIGHT = 4;
var DIRECTION_UP = 8;
var DIRECTION_DOWN = 16;
var DIRECTION_HORIZONTAL = DIRECTION_LEFT | DIRECTION_RIGHT;
var DIRECTION_VERTICAL = DIRECTION_UP | DIRECTION_DOWN;
var DIRECTION_ALL = DIRECTION_HORIZONTAL | DIRECTION_VERTICAL;
var PROPS_XY = ['x', 'y'];
var PROPS_CLIENT_XY = ['clientX', 'clientY'];

/**
 * @private
 * walk objects and arrays
 * @param {Object} obj
 * @param {Function} iterator
 * @param {Object} context
 */
function each(obj, iterator, context) {
  var i;

  if (!obj) {
    return;
  }

  if (obj.forEach) {
    obj.forEach(iterator, context);
  } else if (obj.length !== undefined) {
    i = 0;

    while (i < obj.length) {
      iterator.call(context, obj[i], i, obj);
      i++;
    }
  } else {
    for (i in obj) {
      obj.hasOwnProperty(i) && iterator.call(context, obj[i], i, obj);
    }
  }
}

/**
 * @private
 * let a boolean value also be a function that must return a boolean
 * this first item in args will be used as the context
 * @param {Boolean|Function} val
 * @param {Array} [args]
 * @returns {Boolean}
 */

function boolOrFn(val, args) {
  if (typeof val === TYPE_FUNCTION) {
    return val.apply(args ? args[0] || undefined : undefined, args);
  }

  return val;
}

/**
 * @private
 * small indexOf wrapper
 * @param {String} str
 * @param {String} find
 * @returns {Boolean} found
 */
function inStr(str, find) {
  return str.indexOf(find) > -1;
}

/**
 * @private
 * when the touchActions are collected they are not a valid value, so we need to clean things up. *
 * @param {String} actions
 * @returns {*}
 */

function cleanTouchActions(actions) {
  // none
  if (inStr(actions, TOUCH_ACTION_NONE)) {
    return TOUCH_ACTION_NONE;
  }

  var hasPanX = inStr(actions, TOUCH_ACTION_PAN_X);
  var hasPanY = inStr(actions, TOUCH_ACTION_PAN_Y); // if both pan-x and pan-y are set (different recognizers
  // for different directions, e.g. horizontal pan but vertical swipe?)
  // we need none (as otherwise with pan-x pan-y combined none of these
  // recognizers will work, since the browser would handle all panning

  if (hasPanX && hasPanY) {
    return TOUCH_ACTION_NONE;
  } // pan-x OR pan-y


  if (hasPanX || hasPanY) {
    return hasPanX ? TOUCH_ACTION_PAN_X : TOUCH_ACTION_PAN_Y;
  } // manipulation


  if (inStr(actions, TOUCH_ACTION_MANIPULATION)) {
    return TOUCH_ACTION_MANIPULATION;
  }

  return TOUCH_ACTION_AUTO;
}

/**
 * @private
 * Touch Action
 * sets the touchAction property or uses the js alternative
 * @param {Manager} manager
 * @param {String} value
 * @constructor
 */

var TouchAction =
/*#__PURE__*/
function () {
  function TouchAction(manager, value) {
    this.manager = manager;
    this.set(value);
  }
  /**
   * @private
   * set the touchAction value on the element or enable the polyfill
   * @param {String} value
   */


  var _proto = TouchAction.prototype;

  _proto.set = function set(value) {
    // find out the touch-action by the event handlers
    if (value === TOUCH_ACTION_COMPUTE) {
      value = this.compute();
    }

    if (NATIVE_TOUCH_ACTION && this.manager.element.style && TOUCH_ACTION_MAP[value]) {
      this.manager.element.style[PREFIXED_TOUCH_ACTION] = value;
    }

    this.actions = value.toLowerCase().trim();
  };
  /**
   * @private
   * just re-set the touchAction value
   */


  _proto.update = function update() {
    this.set(this.manager.options.touchAction);
  };
  /**
   * @private
   * compute the value for the touchAction property based on the recognizer's settings
   * @returns {String} value
   */


  _proto.compute = function compute() {
    var actions = [];
    each(this.manager.recognizers, function (recognizer) {
      if (boolOrFn(recognizer.options.enable, [recognizer])) {
        actions = actions.concat(recognizer.getTouchAction());
      }
    });
    return cleanTouchActions(actions.join(' '));
  };
  /**
   * @private
   * this method is called on each input cycle and provides the preventing of the browser behavior
   * @param {Object} input
   */


  _proto.preventDefaults = function preventDefaults(input) {
    var srcEvent = input.srcEvent;
    var direction = input.offsetDirection; // if the touch action did prevented once this session

    if (this.manager.session.prevented) {
      srcEvent.preventDefault();
      return;
    }

    var actions = this.actions;
    var hasNone = inStr(actions, TOUCH_ACTION_NONE) && !TOUCH_ACTION_MAP[TOUCH_ACTION_NONE];
    var hasPanY = inStr(actions, TOUCH_ACTION_PAN_Y) && !TOUCH_ACTION_MAP[TOUCH_ACTION_PAN_Y];
    var hasPanX = inStr(actions, TOUCH_ACTION_PAN_X) && !TOUCH_ACTION_MAP[TOUCH_ACTION_PAN_X];

    if (hasNone) {
      // do not prevent defaults if this is a tap gesture
      var isTapPointer = input.pointers.length === 1;
      var isTapMovement = input.distance < 2;
      var isTapTouchTime = input.deltaTime < 250;

      if (isTapPointer && isTapMovement && isTapTouchTime) {
        return;
      }
    }

    if (hasPanX && hasPanY) {
      // `pan-x pan-y` means browser handles all scrolling/panning, do not prevent
      return;
    }

    if (hasNone || hasPanY && direction & DIRECTION_HORIZONTAL || hasPanX && direction & DIRECTION_VERTICAL) {
      return this.preventSrc(srcEvent);
    }
  };
  /**
   * @private
   * call preventDefault to prevent the browser's default behavior (scrolling in most cases)
   * @param {Object} srcEvent
   */


  _proto.preventSrc = function preventSrc(srcEvent) {
    this.manager.session.prevented = true;
    srcEvent.preventDefault();
  };

  return TouchAction;
}();

/**
 * @private
 * find if a node is in the given parent
 * @method hasParent
 * @param {HTMLElement} node
 * @param {HTMLElement} parent
 * @return {Boolean} found
 */
function hasParent$1(node, parent) {
  while (node) {
    if (node === parent) {
      return true;
    }

    node = node.parentNode;
  }

  return false;
}

/**
 * @private
 * get the center of all the pointers
 * @param {Array} pointers
 * @return {Object} center contains `x` and `y` properties
 */

function getCenter(pointers) {
  var pointersLength = pointers.length; // no need to loop when only one touch

  if (pointersLength === 1) {
    return {
      x: round(pointers[0].clientX),
      y: round(pointers[0].clientY)
    };
  }

  var x = 0;
  var y = 0;
  var i = 0;

  while (i < pointersLength) {
    x += pointers[i].clientX;
    y += pointers[i].clientY;
    i++;
  }

  return {
    x: round(x / pointersLength),
    y: round(y / pointersLength)
  };
}

/**
 * @private
 * create a simple clone from the input used for storage of firstInput and firstMultiple
 * @param {Object} input
 * @returns {Object} clonedInputData
 */

function simpleCloneInputData(input) {
  // make a simple copy of the pointers because we will get a reference if we don't
  // we only need clientXY for the calculations
  var pointers = [];
  var i = 0;

  while (i < input.pointers.length) {
    pointers[i] = {
      clientX: round(input.pointers[i].clientX),
      clientY: round(input.pointers[i].clientY)
    };
    i++;
  }

  return {
    timeStamp: now(),
    pointers: pointers,
    center: getCenter(pointers),
    deltaX: input.deltaX,
    deltaY: input.deltaY
  };
}

/**
 * @private
 * calculate the absolute distance between two points
 * @param {Object} p1 {x, y}
 * @param {Object} p2 {x, y}
 * @param {Array} [props] containing x and y keys
 * @return {Number} distance
 */

function getDistance(p1, p2, props) {
  if (!props) {
    props = PROPS_XY;
  }

  var x = p2[props[0]] - p1[props[0]];
  var y = p2[props[1]] - p1[props[1]];
  return Math.sqrt(x * x + y * y);
}

/**
 * @private
 * calculate the angle between two coordinates
 * @param {Object} p1
 * @param {Object} p2
 * @param {Array} [props] containing x and y keys
 * @return {Number} angle
 */

function getAngle(p1, p2, props) {
  if (!props) {
    props = PROPS_XY;
  }

  var x = p2[props[0]] - p1[props[0]];
  var y = p2[props[1]] - p1[props[1]];
  return Math.atan2(y, x) * 180 / Math.PI;
}

/**
 * @private
 * get the direction between two points
 * @param {Number} x
 * @param {Number} y
 * @return {Number} direction
 */

function getDirection(x, y) {
  if (x === y) {
    return DIRECTION_NONE;
  }

  if (abs(x) >= abs(y)) {
    return x < 0 ? DIRECTION_LEFT : DIRECTION_RIGHT;
  }

  return y < 0 ? DIRECTION_UP : DIRECTION_DOWN;
}

function computeDeltaXY(session, input) {
  var center = input.center; // let { offsetDelta:offset = {}, prevDelta = {}, prevInput = {} } = session;
  // jscs throwing error on defalut destructured values and without defaults tests fail

  var offset = session.offsetDelta || {};
  var prevDelta = session.prevDelta || {};
  var prevInput = session.prevInput || {};

  if (input.eventType === INPUT_START || prevInput.eventType === INPUT_END) {
    prevDelta = session.prevDelta = {
      x: prevInput.deltaX || 0,
      y: prevInput.deltaY || 0
    };
    offset = session.offsetDelta = {
      x: center.x,
      y: center.y
    };
  }

  input.deltaX = prevDelta.x + (center.x - offset.x);
  input.deltaY = prevDelta.y + (center.y - offset.y);
}

/**
 * @private
 * calculate the velocity between two points. unit is in px per ms.
 * @param {Number} deltaTime
 * @param {Number} x
 * @param {Number} y
 * @return {Object} velocity `x` and `y`
 */
function getVelocity(deltaTime, x, y) {
  return {
    x: x / deltaTime || 0,
    y: y / deltaTime || 0
  };
}

/**
 * @private
 * calculate the scale factor between two pointersets
 * no scale is 1, and goes down to 0 when pinched together, and bigger when pinched out
 * @param {Array} start array of pointers
 * @param {Array} end array of pointers
 * @return {Number} scale
 */

function getScale(start, end) {
  return getDistance(end[0], end[1], PROPS_CLIENT_XY) / getDistance(start[0], start[1], PROPS_CLIENT_XY);
}

/**
 * @private
 * calculate the rotation degrees between two pointersets
 * @param {Array} start array of pointers
 * @param {Array} end array of pointers
 * @return {Number} rotation
 */

function getRotation(start, end) {
  return getAngle(end[1], end[0], PROPS_CLIENT_XY) + getAngle(start[1], start[0], PROPS_CLIENT_XY);
}

/**
 * @private
 * velocity is calculated every x ms
 * @param {Object} session
 * @param {Object} input
 */

function computeIntervalInputData(session, input) {
  var last = session.lastInterval || input;
  var deltaTime = input.timeStamp - last.timeStamp;
  var velocity;
  var velocityX;
  var velocityY;
  var direction;

  if (input.eventType !== INPUT_CANCEL && (deltaTime > COMPUTE_INTERVAL || last.velocity === undefined)) {
    var deltaX = input.deltaX - last.deltaX;
    var deltaY = input.deltaY - last.deltaY;
    var v = getVelocity(deltaTime, deltaX, deltaY);
    velocityX = v.x;
    velocityY = v.y;
    velocity = abs(v.x) > abs(v.y) ? v.x : v.y;
    direction = getDirection(deltaX, deltaY);
    session.lastInterval = input;
  } else {
    // use latest velocity info if it doesn't overtake a minimum period
    velocity = last.velocity;
    velocityX = last.velocityX;
    velocityY = last.velocityY;
    direction = last.direction;
  }

  input.velocity = velocity;
  input.velocityX = velocityX;
  input.velocityY = velocityY;
  input.direction = direction;
}

/**
* @private
 * extend the data with some usable properties like scale, rotate, velocity etc
 * @param {Object} manager
 * @param {Object} input
 */

function computeInputData(manager, input) {
  var session = manager.session;
  var pointers = input.pointers;
  var pointersLength = pointers.length; // store the first input to calculate the distance and direction

  if (!session.firstInput) {
    session.firstInput = simpleCloneInputData(input);
  } // to compute scale and rotation we need to store the multiple touches


  if (pointersLength > 1 && !session.firstMultiple) {
    session.firstMultiple = simpleCloneInputData(input);
  } else if (pointersLength === 1) {
    session.firstMultiple = false;
  }

  var firstInput = session.firstInput,
      firstMultiple = session.firstMultiple;
  var offsetCenter = firstMultiple ? firstMultiple.center : firstInput.center;
  var center = input.center = getCenter(pointers);
  input.timeStamp = now();
  input.deltaTime = input.timeStamp - firstInput.timeStamp;
  input.angle = getAngle(offsetCenter, center);
  input.distance = getDistance(offsetCenter, center);
  computeDeltaXY(session, input);
  input.offsetDirection = getDirection(input.deltaX, input.deltaY);
  var overallVelocity = getVelocity(input.deltaTime, input.deltaX, input.deltaY);
  input.overallVelocityX = overallVelocity.x;
  input.overallVelocityY = overallVelocity.y;
  input.overallVelocity = abs(overallVelocity.x) > abs(overallVelocity.y) ? overallVelocity.x : overallVelocity.y;
  input.scale = firstMultiple ? getScale(firstMultiple.pointers, pointers) : 1;
  input.rotation = firstMultiple ? getRotation(firstMultiple.pointers, pointers) : 0;
  input.maxPointers = !session.prevInput ? input.pointers.length : input.pointers.length > session.prevInput.maxPointers ? input.pointers.length : session.prevInput.maxPointers;
  computeIntervalInputData(session, input); // find the correct target

  var target = manager.element;
  var srcEvent = input.srcEvent;
  var srcEventTarget;

  if (srcEvent.composedPath) {
    srcEventTarget = srcEvent.composedPath()[0];
  } else if (srcEvent.path) {
    srcEventTarget = srcEvent.path[0];
  } else {
    srcEventTarget = srcEvent.target;
  }

  if (hasParent$1(srcEventTarget, target)) {
    target = srcEventTarget;
  }

  input.target = target;
}

/**
 * @private
 * handle input events
 * @param {Manager} manager
 * @param {String} eventType
 * @param {Object} input
 */

function inputHandler(manager, eventType, input) {
  var pointersLen = input.pointers.length;
  var changedPointersLen = input.changedPointers.length;
  var isFirst = eventType & INPUT_START && pointersLen - changedPointersLen === 0;
  var isFinal = eventType & (INPUT_END | INPUT_CANCEL) && pointersLen - changedPointersLen === 0;
  input.isFirst = !!isFirst;
  input.isFinal = !!isFinal;

  if (isFirst) {
    manager.session = {};
  } // source event is the normalized value of the domEvents
  // like 'touchstart, mouseup, pointerdown'


  input.eventType = eventType; // compute scale, rotation etc

  computeInputData(manager, input); // emit secret event

  manager.emit('hammer.input', input);
  manager.recognize(input);
  manager.session.prevInput = input;
}

/**
 * @private
 * split string on whitespace
 * @param {String} str
 * @returns {Array} words
 */
function splitStr(str) {
  return str.trim().split(/\s+/g);
}

/**
 * @private
 * addEventListener with multiple events at once
 * @param {EventTarget} target
 * @param {String} types
 * @param {Function} handler
 */

function addEventListeners(target, types, handler) {
  each(splitStr(types), function (type) {
    target.addEventListener(type, handler, false);
  });
}

/**
 * @private
 * removeEventListener with multiple events at once
 * @param {EventTarget} target
 * @param {String} types
 * @param {Function} handler
 */

function removeEventListeners(target, types, handler) {
  each(splitStr(types), function (type) {
    target.removeEventListener(type, handler, false);
  });
}

/**
 * @private
 * get the window object of an element
 * @param {HTMLElement} element
 * @returns {DocumentView|Window}
 */
function getWindowForElement(element) {
  var doc = element.ownerDocument || element;
  return doc.defaultView || doc.parentWindow || window;
}

/**
 * @private
 * create new input type manager
 * @param {Manager} manager
 * @param {Function} callback
 * @returns {Input}
 * @constructor
 */

var Input =
/*#__PURE__*/
function () {
  function Input(manager, callback) {
    var self = this;
    this.manager = manager;
    this.callback = callback;
    this.element = manager.element;
    this.target = manager.options.inputTarget; // smaller wrapper around the handler, for the scope and the enabled state of the manager,
    // so when disabled the input events are completely bypassed.

    this.domHandler = function (ev) {
      if (boolOrFn(manager.options.enable, [manager])) {
        self.handler(ev);
      }
    };

    this.init();
  }
  /**
   * @private
   * should handle the inputEvent data and trigger the callback
   * @virtual
   */


  var _proto = Input.prototype;

  _proto.handler = function handler() {};
  /**
   * @private
   * bind the events
   */


  _proto.init = function init() {
    this.evEl && addEventListeners(this.element, this.evEl, this.domHandler);
    this.evTarget && addEventListeners(this.target, this.evTarget, this.domHandler);
    this.evWin && addEventListeners(getWindowForElement(this.element), this.evWin, this.domHandler);
  };
  /**
   * @private
   * unbind the events
   */


  _proto.destroy = function destroy() {
    this.evEl && removeEventListeners(this.element, this.evEl, this.domHandler);
    this.evTarget && removeEventListeners(this.target, this.evTarget, this.domHandler);
    this.evWin && removeEventListeners(getWindowForElement(this.element), this.evWin, this.domHandler);
  };

  return Input;
}();

/**
 * @private
 * find if a array contains the object using indexOf or a simple polyFill
 * @param {Array} src
 * @param {String} find
 * @param {String} [findByKey]
 * @return {Boolean|Number} false when not found, or the index
 */
function inArray(src, find, findByKey) {
  if (src.indexOf && !findByKey) {
    return src.indexOf(find);
  } else {
    var i = 0;

    while (i < src.length) {
      if (findByKey && src[i][findByKey] == find || !findByKey && src[i] === find) {
        // do not use === here, test fails
        return i;
      }

      i++;
    }

    return -1;
  }
}

var POINTER_INPUT_MAP = {
  pointerdown: INPUT_START,
  pointermove: INPUT_MOVE,
  pointerup: INPUT_END,
  pointercancel: INPUT_CANCEL,
  pointerout: INPUT_CANCEL
}; // in IE10 the pointer types is defined as an enum

var IE10_POINTER_TYPE_ENUM = {
  2: INPUT_TYPE_TOUCH,
  3: INPUT_TYPE_PEN,
  4: INPUT_TYPE_MOUSE,
  5: INPUT_TYPE_KINECT // see https://twitter.com/jacobrossi/status/480596438489890816

};
var POINTER_ELEMENT_EVENTS = 'pointerdown';
var POINTER_WINDOW_EVENTS = 'pointermove pointerup pointercancel'; // IE10 has prefixed support, and case-sensitive

if (win.MSPointerEvent && !win.PointerEvent) {
  POINTER_ELEMENT_EVENTS = 'MSPointerDown';
  POINTER_WINDOW_EVENTS = 'MSPointerMove MSPointerUp MSPointerCancel';
}
/**
 * @private
 * Pointer events input
 * @constructor
 * @extends Input
 */


var PointerEventInput =
/*#__PURE__*/
function (_Input) {
  _inheritsLoose(PointerEventInput, _Input);

  function PointerEventInput() {
    var _this;

    var proto = PointerEventInput.prototype;
    proto.evEl = POINTER_ELEMENT_EVENTS;
    proto.evWin = POINTER_WINDOW_EVENTS;
    _this = _Input.apply(this, arguments) || this;
    _this.store = _this.manager.session.pointerEvents = [];
    return _this;
  }
  /**
   * @private
   * handle mouse events
   * @param {Object} ev
   */


  var _proto = PointerEventInput.prototype;

  _proto.handler = function handler(ev) {
    var store = this.store;
    var removePointer = false;
    var eventTypeNormalized = ev.type.toLowerCase().replace('ms', '');
    var eventType = POINTER_INPUT_MAP[eventTypeNormalized];
    var pointerType = IE10_POINTER_TYPE_ENUM[ev.pointerType] || ev.pointerType;
    var isTouch = pointerType === INPUT_TYPE_TOUCH; // get index of the event in the store

    var storeIndex = inArray(store, ev.pointerId, 'pointerId'); // start and mouse must be down

    if (eventType & INPUT_START && (ev.button === 0 || isTouch)) {
      if (storeIndex < 0) {
        store.push(ev);
        storeIndex = store.length - 1;
      }
    } else if (eventType & (INPUT_END | INPUT_CANCEL)) {
      removePointer = true;
    } // it not found, so the pointer hasn't been down (so it's probably a hover)


    if (storeIndex < 0) {
      return;
    } // update the event in the store


    store[storeIndex] = ev;
    this.callback(this.manager, eventType, {
      pointers: store,
      changedPointers: [ev],
      pointerType: pointerType,
      srcEvent: ev
    });

    if (removePointer) {
      // remove from the store
      store.splice(storeIndex, 1);
    }
  };

  return PointerEventInput;
}(Input);

/**
 * @private
 * convert array-like objects to real arrays
 * @param {Object} obj
 * @returns {Array}
 */
function toArray$1(obj) {
  return Array.prototype.slice.call(obj, 0);
}

/**
 * @private
 * unique array with objects based on a key (like 'id') or just by the array's value
 * @param {Array} src [{id:1},{id:2},{id:1}]
 * @param {String} [key]
 * @param {Boolean} [sort=False]
 * @returns {Array} [{id:1},{id:2}]
 */

function uniqueArray(src, key, sort) {
  var results = [];
  var values = [];
  var i = 0;

  while (i < src.length) {
    var val = key ? src[i][key] : src[i];

    if (inArray(values, val) < 0) {
      results.push(src[i]);
    }

    values[i] = val;
    i++;
  }

  if (sort) {
    if (!key) {
      results = results.sort();
    } else {
      results = results.sort(function (a, b) {
        return a[key] > b[key];
      });
    }
  }

  return results;
}

var TOUCH_INPUT_MAP = {
  touchstart: INPUT_START,
  touchmove: INPUT_MOVE,
  touchend: INPUT_END,
  touchcancel: INPUT_CANCEL
};
var TOUCH_TARGET_EVENTS = 'touchstart touchmove touchend touchcancel';
/**
 * @private
 * Multi-user touch events input
 * @constructor
 * @extends Input
 */

var TouchInput =
/*#__PURE__*/
function (_Input) {
  _inheritsLoose(TouchInput, _Input);

  function TouchInput() {
    var _this;

    TouchInput.prototype.evTarget = TOUCH_TARGET_EVENTS;
    _this = _Input.apply(this, arguments) || this;
    _this.targetIds = {}; // this.evTarget = TOUCH_TARGET_EVENTS;

    return _this;
  }

  var _proto = TouchInput.prototype;

  _proto.handler = function handler(ev) {
    var type = TOUCH_INPUT_MAP[ev.type];
    var touches = getTouches.call(this, ev, type);

    if (!touches) {
      return;
    }

    this.callback(this.manager, type, {
      pointers: touches[0],
      changedPointers: touches[1],
      pointerType: INPUT_TYPE_TOUCH,
      srcEvent: ev
    });
  };

  return TouchInput;
}(Input);

function getTouches(ev, type) {
  var allTouches = toArray$1(ev.touches);
  var targetIds = this.targetIds; // when there is only one touch, the process can be simplified

  if (type & (INPUT_START | INPUT_MOVE) && allTouches.length === 1) {
    targetIds[allTouches[0].identifier] = true;
    return [allTouches, allTouches];
  }

  var i;
  var targetTouches;
  var changedTouches = toArray$1(ev.changedTouches);
  var changedTargetTouches = [];
  var target = this.target; // get target touches from touches

  targetTouches = allTouches.filter(function (touch) {
    return hasParent$1(touch.target, target);
  }); // collect touches

  if (type === INPUT_START) {
    i = 0;

    while (i < targetTouches.length) {
      targetIds[targetTouches[i].identifier] = true;
      i++;
    }
  } // filter changed touches to only contain touches that exist in the collected target ids


  i = 0;

  while (i < changedTouches.length) {
    if (targetIds[changedTouches[i].identifier]) {
      changedTargetTouches.push(changedTouches[i]);
    } // cleanup removed touches


    if (type & (INPUT_END | INPUT_CANCEL)) {
      delete targetIds[changedTouches[i].identifier];
    }

    i++;
  }

  if (!changedTargetTouches.length) {
    return;
  }

  return [// merge targetTouches with changedTargetTouches so it contains ALL touches, including 'end' and 'cancel'
  uniqueArray(targetTouches.concat(changedTargetTouches), 'identifier', true), changedTargetTouches];
}

var MOUSE_INPUT_MAP = {
  mousedown: INPUT_START,
  mousemove: INPUT_MOVE,
  mouseup: INPUT_END
};
var MOUSE_ELEMENT_EVENTS = 'mousedown';
var MOUSE_WINDOW_EVENTS = 'mousemove mouseup';
/**
 * @private
 * Mouse events input
 * @constructor
 * @extends Input
 */

var MouseInput =
/*#__PURE__*/
function (_Input) {
  _inheritsLoose(MouseInput, _Input);

  function MouseInput() {
    var _this;

    var proto = MouseInput.prototype;
    proto.evEl = MOUSE_ELEMENT_EVENTS;
    proto.evWin = MOUSE_WINDOW_EVENTS;
    _this = _Input.apply(this, arguments) || this;
    _this.pressed = false; // mousedown state

    return _this;
  }
  /**
   * @private
   * handle mouse events
   * @param {Object} ev
   */


  var _proto = MouseInput.prototype;

  _proto.handler = function handler(ev) {
    var eventType = MOUSE_INPUT_MAP[ev.type]; // on start we want to have the left mouse button down

    if (eventType & INPUT_START && ev.button === 0) {
      this.pressed = true;
    }

    if (eventType & INPUT_MOVE && ev.which !== 1) {
      eventType = INPUT_END;
    } // mouse must be down


    if (!this.pressed) {
      return;
    }

    if (eventType & INPUT_END) {
      this.pressed = false;
    }

    this.callback(this.manager, eventType, {
      pointers: [ev],
      changedPointers: [ev],
      pointerType: INPUT_TYPE_MOUSE,
      srcEvent: ev
    });
  };

  return MouseInput;
}(Input);

/**
 * @private
 * Combined touch and mouse input
 *
 * Touch has a higher priority then mouse, and while touching no mouse events are allowed.
 * This because touch devices also emit mouse events while doing a touch.
 *
 * @constructor
 * @extends Input
 */

var DEDUP_TIMEOUT = 2500;
var DEDUP_DISTANCE = 25;

function setLastTouch(eventData) {
  var _eventData$changedPoi = eventData.changedPointers,
      touch = _eventData$changedPoi[0];

  if (touch.identifier === this.primaryTouch) {
    var lastTouch = {
      x: touch.clientX,
      y: touch.clientY
    };
    var lts = this.lastTouches;
    this.lastTouches.push(lastTouch);

    var removeLastTouch = function removeLastTouch() {
      var i = lts.indexOf(lastTouch);

      if (i > -1) {
        lts.splice(i, 1);
      }
    };

    setTimeout(removeLastTouch, DEDUP_TIMEOUT);
  }
}

function recordTouches(eventType, eventData) {
  if (eventType & INPUT_START) {
    this.primaryTouch = eventData.changedPointers[0].identifier;
    setLastTouch.call(this, eventData);
  } else if (eventType & (INPUT_END | INPUT_CANCEL)) {
    setLastTouch.call(this, eventData);
  }
}

function isSyntheticEvent(eventData) {
  var x = eventData.srcEvent.clientX;
  var y = eventData.srcEvent.clientY;

  for (var i = 0; i < this.lastTouches.length; i++) {
    var t = this.lastTouches[i];
    var dx = Math.abs(x - t.x);
    var dy = Math.abs(y - t.y);

    if (dx <= DEDUP_DISTANCE && dy <= DEDUP_DISTANCE) {
      return true;
    }
  }

  return false;
}

var TouchMouseInput =
/*#__PURE__*/
function () {
  var TouchMouseInput =
  /*#__PURE__*/
  function (_Input) {
    _inheritsLoose(TouchMouseInput, _Input);

    function TouchMouseInput(_manager, callback) {
      var _this;

      _this = _Input.call(this, _manager, callback) || this;

      _this.handler = function (manager, inputEvent, inputData) {
        var isTouch = inputData.pointerType === INPUT_TYPE_TOUCH;
        var isMouse = inputData.pointerType === INPUT_TYPE_MOUSE;

        if (isMouse && inputData.sourceCapabilities && inputData.sourceCapabilities.firesTouchEvents) {
          return;
        } // when we're in a touch event, record touches to  de-dupe synthetic mouse event


        if (isTouch) {
          recordTouches.call(_assertThisInitialized(_assertThisInitialized(_this)), inputEvent, inputData);
        } else if (isMouse && isSyntheticEvent.call(_assertThisInitialized(_assertThisInitialized(_this)), inputData)) {
          return;
        }

        _this.callback(manager, inputEvent, inputData);
      };

      _this.touch = new TouchInput(_this.manager, _this.handler);
      _this.mouse = new MouseInput(_this.manager, _this.handler);
      _this.primaryTouch = null;
      _this.lastTouches = [];
      return _this;
    }
    /**
     * @private
     * handle mouse and touch events
     * @param {Hammer} manager
     * @param {String} inputEvent
     * @param {Object} inputData
     */


    var _proto = TouchMouseInput.prototype;

    /**
     * @private
     * remove the event listeners
     */
    _proto.destroy = function destroy() {
      this.touch.destroy();
      this.mouse.destroy();
    };

    return TouchMouseInput;
  }(Input);

  return TouchMouseInput;
}();

/**
 * @private
 * create new input type manager
 * called by the Manager constructor
 * @param {Hammer} manager
 * @returns {Input}
 */

function createInputInstance(manager) {
  var Type; // let inputClass = manager.options.inputClass;

  var inputClass = manager.options.inputClass;

  if (inputClass) {
    Type = inputClass;
  } else if (SUPPORT_POINTER_EVENTS) {
    Type = PointerEventInput;
  } else if (SUPPORT_ONLY_TOUCH) {
    Type = TouchInput;
  } else if (!SUPPORT_TOUCH) {
    Type = MouseInput;
  } else {
    Type = TouchMouseInput;
  }

  return new Type(manager, inputHandler);
}

/**
 * @private
 * if the argument is an array, we want to execute the fn on each entry
 * if it aint an array we don't want to do a thing.
 * this is used by all the methods that accept a single and array argument.
 * @param {*|Array} arg
 * @param {String} fn
 * @param {Object} [context]
 * @returns {Boolean}
 */

function invokeArrayArg(arg, fn, context) {
  if (Array.isArray(arg)) {
    each(arg, context[fn], context);
    return true;
  }

  return false;
}

var STATE_POSSIBLE = 1;
var STATE_BEGAN = 2;
var STATE_CHANGED = 4;
var STATE_ENDED = 8;
var STATE_RECOGNIZED = STATE_ENDED;
var STATE_CANCELLED = 16;
var STATE_FAILED = 32;

/**
 * @private
 * get a unique id
 * @returns {number} uniqueId
 */
var _uniqueId = 1;
function uniqueId() {
  return _uniqueId++;
}

/**
 * @private
 * get a recognizer by name if it is bound to a manager
 * @param {Recognizer|String} otherRecognizer
 * @param {Recognizer} recognizer
 * @returns {Recognizer}
 */
function getRecognizerByNameIfManager(otherRecognizer, recognizer) {
  var manager = recognizer.manager;

  if (manager) {
    return manager.get(otherRecognizer);
  }

  return otherRecognizer;
}

/**
 * @private
 * get a usable string, used as event postfix
 * @param {constant} state
 * @returns {String} state
 */

function stateStr(state) {
  if (state & STATE_CANCELLED) {
    return 'cancel';
  } else if (state & STATE_ENDED) {
    return 'end';
  } else if (state & STATE_CHANGED) {
    return 'move';
  } else if (state & STATE_BEGAN) {
    return 'start';
  }

  return '';
}

/**
 * @private
 * Recognizer flow explained; *
 * All recognizers have the initial state of POSSIBLE when a input session starts.
 * The definition of a input session is from the first input until the last input, with all it's movement in it. *
 * Example session for mouse-input: mousedown -> mousemove -> mouseup
 *
 * On each recognizing cycle (see Manager.recognize) the .recognize() method is executed
 * which determines with state it should be.
 *
 * If the recognizer has the state FAILED, CANCELLED or RECOGNIZED (equals ENDED), it is reset to
 * POSSIBLE to give it another change on the next cycle.
 *
 *               Possible
 *                  |
 *            +-----+---------------+
 *            |                     |
 *      +-----+-----+               |
 *      |           |               |
 *   Failed      Cancelled          |
 *                          +-------+------+
 *                          |              |
 *                      Recognized       Began
 *                                         |
 *                                      Changed
 *                                         |
 *                                  Ended/Recognized
 */

/**
 * @private
 * Recognizer
 * Every recognizer needs to extend from this class.
 * @constructor
 * @param {Object} options
 */

var Recognizer =
/*#__PURE__*/
function () {
  function Recognizer(options) {
    if (options === void 0) {
      options = {};
    }

    this.options = _extends({
      enable: true
    }, options);
    this.id = uniqueId();
    this.manager = null; // default is enable true

    this.state = STATE_POSSIBLE;
    this.simultaneous = {};
    this.requireFail = [];
  }
  /**
   * @private
   * set options
   * @param {Object} options
   * @return {Recognizer}
   */


  var _proto = Recognizer.prototype;

  _proto.set = function set(options) {
    assign$1(this.options, options); // also update the touchAction, in case something changed about the directions/enabled state

    this.manager && this.manager.touchAction.update();
    return this;
  };
  /**
   * @private
   * recognize simultaneous with an other recognizer.
   * @param {Recognizer} otherRecognizer
   * @returns {Recognizer} this
   */


  _proto.recognizeWith = function recognizeWith(otherRecognizer) {
    if (invokeArrayArg(otherRecognizer, 'recognizeWith', this)) {
      return this;
    }

    var simultaneous = this.simultaneous;
    otherRecognizer = getRecognizerByNameIfManager(otherRecognizer, this);

    if (!simultaneous[otherRecognizer.id]) {
      simultaneous[otherRecognizer.id] = otherRecognizer;
      otherRecognizer.recognizeWith(this);
    }

    return this;
  };
  /**
   * @private
   * drop the simultaneous link. it doesnt remove the link on the other recognizer.
   * @param {Recognizer} otherRecognizer
   * @returns {Recognizer} this
   */


  _proto.dropRecognizeWith = function dropRecognizeWith(otherRecognizer) {
    if (invokeArrayArg(otherRecognizer, 'dropRecognizeWith', this)) {
      return this;
    }

    otherRecognizer = getRecognizerByNameIfManager(otherRecognizer, this);
    delete this.simultaneous[otherRecognizer.id];
    return this;
  };
  /**
   * @private
   * recognizer can only run when an other is failing
   * @param {Recognizer} otherRecognizer
   * @returns {Recognizer} this
   */


  _proto.requireFailure = function requireFailure(otherRecognizer) {
    if (invokeArrayArg(otherRecognizer, 'requireFailure', this)) {
      return this;
    }

    var requireFail = this.requireFail;
    otherRecognizer = getRecognizerByNameIfManager(otherRecognizer, this);

    if (inArray(requireFail, otherRecognizer) === -1) {
      requireFail.push(otherRecognizer);
      otherRecognizer.requireFailure(this);
    }

    return this;
  };
  /**
   * @private
   * drop the requireFailure link. it does not remove the link on the other recognizer.
   * @param {Recognizer} otherRecognizer
   * @returns {Recognizer} this
   */


  _proto.dropRequireFailure = function dropRequireFailure(otherRecognizer) {
    if (invokeArrayArg(otherRecognizer, 'dropRequireFailure', this)) {
      return this;
    }

    otherRecognizer = getRecognizerByNameIfManager(otherRecognizer, this);
    var index = inArray(this.requireFail, otherRecognizer);

    if (index > -1) {
      this.requireFail.splice(index, 1);
    }

    return this;
  };
  /**
   * @private
   * has require failures boolean
   * @returns {boolean}
   */


  _proto.hasRequireFailures = function hasRequireFailures() {
    return this.requireFail.length > 0;
  };
  /**
   * @private
   * if the recognizer can recognize simultaneous with an other recognizer
   * @param {Recognizer} otherRecognizer
   * @returns {Boolean}
   */


  _proto.canRecognizeWith = function canRecognizeWith(otherRecognizer) {
    return !!this.simultaneous[otherRecognizer.id];
  };
  /**
   * @private
   * You should use `tryEmit` instead of `emit` directly to check
   * that all the needed recognizers has failed before emitting.
   * @param {Object} input
   */


  _proto.emit = function emit(input) {
    var self = this;
    var state = this.state;

    function emit(event) {
      self.manager.emit(event, input);
    } // 'panstart' and 'panmove'


    if (state < STATE_ENDED) {
      emit(self.options.event + stateStr(state));
    }

    emit(self.options.event); // simple 'eventName' events

    if (input.additionalEvent) {
      // additional event(panleft, panright, pinchin, pinchout...)
      emit(input.additionalEvent);
    } // panend and pancancel


    if (state >= STATE_ENDED) {
      emit(self.options.event + stateStr(state));
    }
  };
  /**
   * @private
   * Check that all the require failure recognizers has failed,
   * if true, it emits a gesture event,
   * otherwise, setup the state to FAILED.
   * @param {Object} input
   */


  _proto.tryEmit = function tryEmit(input) {
    if (this.canEmit()) {
      return this.emit(input);
    } // it's failing anyway


    this.state = STATE_FAILED;
  };
  /**
   * @private
   * can we emit?
   * @returns {boolean}
   */


  _proto.canEmit = function canEmit() {
    var i = 0;

    while (i < this.requireFail.length) {
      if (!(this.requireFail[i].state & (STATE_FAILED | STATE_POSSIBLE))) {
        return false;
      }

      i++;
    }

    return true;
  };
  /**
   * @private
   * update the recognizer
   * @param {Object} inputData
   */


  _proto.recognize = function recognize(inputData) {
    // make a new copy of the inputData
    // so we can change the inputData without messing up the other recognizers
    var inputDataClone = assign$1({}, inputData); // is is enabled and allow recognizing?

    if (!boolOrFn(this.options.enable, [this, inputDataClone])) {
      this.reset();
      this.state = STATE_FAILED;
      return;
    } // reset when we've reached the end


    if (this.state & (STATE_RECOGNIZED | STATE_CANCELLED | STATE_FAILED)) {
      this.state = STATE_POSSIBLE;
    }

    this.state = this.process(inputDataClone); // the recognizer has recognized a gesture
    // so trigger an event

    if (this.state & (STATE_BEGAN | STATE_CHANGED | STATE_ENDED | STATE_CANCELLED)) {
      this.tryEmit(inputDataClone);
    }
  };
  /**
   * @private
   * return the state of the recognizer
   * the actual recognizing happens in this method
   * @virtual
   * @param {Object} inputData
   * @returns {constant} STATE
   */

  /* jshint ignore:start */


  _proto.process = function process(inputData) {};
  /* jshint ignore:end */

  /**
   * @private
   * return the preferred touch-action
   * @virtual
   * @returns {Array}
   */


  _proto.getTouchAction = function getTouchAction() {};
  /**
   * @private
   * called when the gesture isn't allowed to recognize
   * like when another is being recognized or it is disabled
   * @virtual
   */


  _proto.reset = function reset() {};

  return Recognizer;
}();

/**
 * @private
 * A tap is recognized when the pointer is doing a small tap/click. Multiple taps are recognized if they occur
 * between the given interval and position. The delay option can be used to recognize multi-taps without firing
 * a single tap.
 *
 * The eventData from the emitted event contains the property `tapCount`, which contains the amount of
 * multi-taps being recognized.
 * @constructor
 * @extends Recognizer
 */

var TapRecognizer =
/*#__PURE__*/
function (_Recognizer) {
  _inheritsLoose(TapRecognizer, _Recognizer);

  function TapRecognizer(options) {
    var _this;

    if (options === void 0) {
      options = {};
    }

    _this = _Recognizer.call(this, _extends({
      event: 'tap',
      pointers: 1,
      taps: 1,
      interval: 300,
      // max time between the multi-tap taps
      time: 250,
      // max time of the pointer to be down (like finger on the screen)
      threshold: 9,
      // a minimal movement is ok, but keep it low
      posThreshold: 10
    }, options)) || this; // previous time and center,
    // used for tap counting

    _this.pTime = false;
    _this.pCenter = false;
    _this._timer = null;
    _this._input = null;
    _this.count = 0;
    return _this;
  }

  var _proto = TapRecognizer.prototype;

  _proto.getTouchAction = function getTouchAction() {
    return [TOUCH_ACTION_MANIPULATION];
  };

  _proto.process = function process(input) {
    var _this2 = this;

    var options = this.options;
    var validPointers = input.pointers.length === options.pointers;
    var validMovement = input.distance < options.threshold;
    var validTouchTime = input.deltaTime < options.time;
    this.reset();

    if (input.eventType & INPUT_START && this.count === 0) {
      return this.failTimeout();
    } // we only allow little movement
    // and we've reached an end event, so a tap is possible


    if (validMovement && validTouchTime && validPointers) {
      if (input.eventType !== INPUT_END) {
        return this.failTimeout();
      }

      var validInterval = this.pTime ? input.timeStamp - this.pTime < options.interval : true;
      var validMultiTap = !this.pCenter || getDistance(this.pCenter, input.center) < options.posThreshold;
      this.pTime = input.timeStamp;
      this.pCenter = input.center;

      if (!validMultiTap || !validInterval) {
        this.count = 1;
      } else {
        this.count += 1;
      }

      this._input = input; // if tap count matches we have recognized it,
      // else it has began recognizing...

      var tapCount = this.count % options.taps;

      if (tapCount === 0) {
        // no failing requirements, immediately trigger the tap event
        // or wait as long as the multitap interval to trigger
        if (!this.hasRequireFailures()) {
          return STATE_RECOGNIZED;
        } else {
          this._timer = setTimeout(function () {
            _this2.state = STATE_RECOGNIZED;

            _this2.tryEmit();
          }, options.interval);
          return STATE_BEGAN;
        }
      }
    }

    return STATE_FAILED;
  };

  _proto.failTimeout = function failTimeout() {
    var _this3 = this;

    this._timer = setTimeout(function () {
      _this3.state = STATE_FAILED;
    }, this.options.interval);
    return STATE_FAILED;
  };

  _proto.reset = function reset() {
    clearTimeout(this._timer);
  };

  _proto.emit = function emit() {
    if (this.state === STATE_RECOGNIZED) {
      this._input.tapCount = this.count;
      this.manager.emit(this.options.event, this._input);
    }
  };

  return TapRecognizer;
}(Recognizer);

/**
 * @private
 * This recognizer is just used as a base for the simple attribute recognizers.
 * @constructor
 * @extends Recognizer
 */

var AttrRecognizer =
/*#__PURE__*/
function (_Recognizer) {
  _inheritsLoose(AttrRecognizer, _Recognizer);

  function AttrRecognizer(options) {
    if (options === void 0) {
      options = {};
    }

    return _Recognizer.call(this, _extends({
      pointers: 1
    }, options)) || this;
  }
  /**
   * @private
   * Used to check if it the recognizer receives valid input, like input.distance > 10.
   * @memberof AttrRecognizer
   * @param {Object} input
   * @returns {Boolean} recognized
   */


  var _proto = AttrRecognizer.prototype;

  _proto.attrTest = function attrTest(input) {
    var optionPointers = this.options.pointers;
    return optionPointers === 0 || input.pointers.length === optionPointers;
  };
  /**
   * @private
   * Process the input and return the state for the recognizer
   * @memberof AttrRecognizer
   * @param {Object} input
   * @returns {*} State
   */


  _proto.process = function process(input) {
    var state = this.state;
    var eventType = input.eventType;
    var isRecognized = state & (STATE_BEGAN | STATE_CHANGED);
    var isValid = this.attrTest(input); // on cancel input and we've recognized before, return STATE_CANCELLED

    if (isRecognized && (eventType & INPUT_CANCEL || !isValid)) {
      return state | STATE_CANCELLED;
    } else if (isRecognized || isValid) {
      if (eventType & INPUT_END) {
        return state | STATE_ENDED;
      } else if (!(state & STATE_BEGAN)) {
        return STATE_BEGAN;
      }

      return state | STATE_CHANGED;
    }

    return STATE_FAILED;
  };

  return AttrRecognizer;
}(Recognizer);

/**
 * @private
 * direction cons to string
 * @param {constant} direction
 * @returns {String}
 */

function directionStr(direction) {
  if (direction === DIRECTION_DOWN) {
    return 'down';
  } else if (direction === DIRECTION_UP) {
    return 'up';
  } else if (direction === DIRECTION_LEFT) {
    return 'left';
  } else if (direction === DIRECTION_RIGHT) {
    return 'right';
  }

  return '';
}

/**
 * @private
 * Pan
 * Recognized when the pointer is down and moved in the allowed direction.
 * @constructor
 * @extends AttrRecognizer
 */

var PanRecognizer =
/*#__PURE__*/
function (_AttrRecognizer) {
  _inheritsLoose(PanRecognizer, _AttrRecognizer);

  function PanRecognizer(options) {
    var _this;

    if (options === void 0) {
      options = {};
    }

    _this = _AttrRecognizer.call(this, _extends({
      event: 'pan',
      threshold: 10,
      pointers: 1,
      direction: DIRECTION_ALL
    }, options)) || this;
    _this.pX = null;
    _this.pY = null;
    return _this;
  }

  var _proto = PanRecognizer.prototype;

  _proto.getTouchAction = function getTouchAction() {
    var direction = this.options.direction;
    var actions = [];

    if (direction & DIRECTION_HORIZONTAL) {
      actions.push(TOUCH_ACTION_PAN_Y);
    }

    if (direction & DIRECTION_VERTICAL) {
      actions.push(TOUCH_ACTION_PAN_X);
    }

    return actions;
  };

  _proto.directionTest = function directionTest(input) {
    var options = this.options;
    var hasMoved = true;
    var distance = input.distance;
    var direction = input.direction;
    var x = input.deltaX;
    var y = input.deltaY; // lock to axis?

    if (!(direction & options.direction)) {
      if (options.direction & DIRECTION_HORIZONTAL) {
        direction = x === 0 ? DIRECTION_NONE : x < 0 ? DIRECTION_LEFT : DIRECTION_RIGHT;
        hasMoved = x !== this.pX;
        distance = Math.abs(input.deltaX);
      } else {
        direction = y === 0 ? DIRECTION_NONE : y < 0 ? DIRECTION_UP : DIRECTION_DOWN;
        hasMoved = y !== this.pY;
        distance = Math.abs(input.deltaY);
      }
    }

    input.direction = direction;
    return hasMoved && distance > options.threshold && direction & options.direction;
  };

  _proto.attrTest = function attrTest(input) {
    return AttrRecognizer.prototype.attrTest.call(this, input) && ( // replace with a super call
    this.state & STATE_BEGAN || !(this.state & STATE_BEGAN) && this.directionTest(input));
  };

  _proto.emit = function emit(input) {
    this.pX = input.deltaX;
    this.pY = input.deltaY;
    var direction = directionStr(input.direction);

    if (direction) {
      input.additionalEvent = this.options.event + direction;
    }

    _AttrRecognizer.prototype.emit.call(this, input);
  };

  return PanRecognizer;
}(AttrRecognizer);

/**
 * @private
 * Swipe
 * Recognized when the pointer is moving fast (velocity), with enough distance in the allowed direction.
 * @constructor
 * @extends AttrRecognizer
 */

var SwipeRecognizer =
/*#__PURE__*/
function (_AttrRecognizer) {
  _inheritsLoose(SwipeRecognizer, _AttrRecognizer);

  function SwipeRecognizer(options) {
    if (options === void 0) {
      options = {};
    }

    return _AttrRecognizer.call(this, _extends({
      event: 'swipe',
      threshold: 10,
      velocity: 0.3,
      direction: DIRECTION_HORIZONTAL | DIRECTION_VERTICAL,
      pointers: 1
    }, options)) || this;
  }

  var _proto = SwipeRecognizer.prototype;

  _proto.getTouchAction = function getTouchAction() {
    return PanRecognizer.prototype.getTouchAction.call(this);
  };

  _proto.attrTest = function attrTest(input) {
    var direction = this.options.direction;
    var velocity;

    if (direction & (DIRECTION_HORIZONTAL | DIRECTION_VERTICAL)) {
      velocity = input.overallVelocity;
    } else if (direction & DIRECTION_HORIZONTAL) {
      velocity = input.overallVelocityX;
    } else if (direction & DIRECTION_VERTICAL) {
      velocity = input.overallVelocityY;
    }

    return _AttrRecognizer.prototype.attrTest.call(this, input) && direction & input.offsetDirection && input.distance > this.options.threshold && input.maxPointers === this.options.pointers && abs(velocity) > this.options.velocity && input.eventType & INPUT_END;
  };

  _proto.emit = function emit(input) {
    var direction = directionStr(input.offsetDirection);

    if (direction) {
      this.manager.emit(this.options.event + direction, input);
    }

    this.manager.emit(this.options.event, input);
  };

  return SwipeRecognizer;
}(AttrRecognizer);

/**
 * @private
 * Pinch
 * Recognized when two or more pointers are moving toward (zoom-in) or away from each other (zoom-out).
 * @constructor
 * @extends AttrRecognizer
 */

var PinchRecognizer =
/*#__PURE__*/
function (_AttrRecognizer) {
  _inheritsLoose(PinchRecognizer, _AttrRecognizer);

  function PinchRecognizer(options) {
    if (options === void 0) {
      options = {};
    }

    return _AttrRecognizer.call(this, _extends({
      event: 'pinch',
      threshold: 0,
      pointers: 2
    }, options)) || this;
  }

  var _proto = PinchRecognizer.prototype;

  _proto.getTouchAction = function getTouchAction() {
    return [TOUCH_ACTION_NONE];
  };

  _proto.attrTest = function attrTest(input) {
    return _AttrRecognizer.prototype.attrTest.call(this, input) && (Math.abs(input.scale - 1) > this.options.threshold || this.state & STATE_BEGAN);
  };

  _proto.emit = function emit(input) {
    if (input.scale !== 1) {
      var inOut = input.scale < 1 ? 'in' : 'out';
      input.additionalEvent = this.options.event + inOut;
    }

    _AttrRecognizer.prototype.emit.call(this, input);
  };

  return PinchRecognizer;
}(AttrRecognizer);

/**
 * @private
 * Rotate
 * Recognized when two or more pointer are moving in a circular motion.
 * @constructor
 * @extends AttrRecognizer
 */

var RotateRecognizer =
/*#__PURE__*/
function (_AttrRecognizer) {
  _inheritsLoose(RotateRecognizer, _AttrRecognizer);

  function RotateRecognizer(options) {
    if (options === void 0) {
      options = {};
    }

    return _AttrRecognizer.call(this, _extends({
      event: 'rotate',
      threshold: 0,
      pointers: 2
    }, options)) || this;
  }

  var _proto = RotateRecognizer.prototype;

  _proto.getTouchAction = function getTouchAction() {
    return [TOUCH_ACTION_NONE];
  };

  _proto.attrTest = function attrTest(input) {
    return _AttrRecognizer.prototype.attrTest.call(this, input) && (Math.abs(input.rotation) > this.options.threshold || this.state & STATE_BEGAN);
  };

  return RotateRecognizer;
}(AttrRecognizer);

/**
 * @private
 * Press
 * Recognized when the pointer is down for x ms without any movement.
 * @constructor
 * @extends Recognizer
 */

var PressRecognizer =
/*#__PURE__*/
function (_Recognizer) {
  _inheritsLoose(PressRecognizer, _Recognizer);

  function PressRecognizer(options) {
    var _this;

    if (options === void 0) {
      options = {};
    }

    _this = _Recognizer.call(this, _extends({
      event: 'press',
      pointers: 1,
      time: 251,
      // minimal time of the pointer to be pressed
      threshold: 9
    }, options)) || this;
    _this._timer = null;
    _this._input = null;
    return _this;
  }

  var _proto = PressRecognizer.prototype;

  _proto.getTouchAction = function getTouchAction() {
    return [TOUCH_ACTION_AUTO];
  };

  _proto.process = function process(input) {
    var _this2 = this;

    var options = this.options;
    var validPointers = input.pointers.length === options.pointers;
    var validMovement = input.distance < options.threshold;
    var validTime = input.deltaTime > options.time;
    this._input = input; // we only allow little movement
    // and we've reached an end event, so a tap is possible

    if (!validMovement || !validPointers || input.eventType & (INPUT_END | INPUT_CANCEL) && !validTime) {
      this.reset();
    } else if (input.eventType & INPUT_START) {
      this.reset();
      this._timer = setTimeout(function () {
        _this2.state = STATE_RECOGNIZED;

        _this2.tryEmit();
      }, options.time);
    } else if (input.eventType & INPUT_END) {
      return STATE_RECOGNIZED;
    }

    return STATE_FAILED;
  };

  _proto.reset = function reset() {
    clearTimeout(this._timer);
  };

  _proto.emit = function emit(input) {
    if (this.state !== STATE_RECOGNIZED) {
      return;
    }

    if (input && input.eventType & INPUT_END) {
      this.manager.emit(this.options.event + "up", input);
    } else {
      this._input.timeStamp = now();
      this.manager.emit(this.options.event, this._input);
    }
  };

  return PressRecognizer;
}(Recognizer);

var defaults = {
  /**
   * @private
   * set if DOM events are being triggered.
   * But this is slower and unused by simple implementations, so disabled by default.
   * @type {Boolean}
   * @default false
   */
  domEvents: false,

  /**
   * @private
   * The value for the touchAction property/fallback.
   * When set to `compute` it will magically set the correct value based on the added recognizers.
   * @type {String}
   * @default compute
   */
  touchAction: TOUCH_ACTION_COMPUTE,

  /**
   * @private
   * @type {Boolean}
   * @default true
   */
  enable: true,

  /**
   * @private
   * EXPERIMENTAL FEATURE -- can be removed/changed
   * Change the parent input target element.
   * If Null, then it is being set the to main element.
   * @type {Null|EventTarget}
   * @default null
   */
  inputTarget: null,

  /**
   * @private
   * force an input class
   * @type {Null|Function}
   * @default null
   */
  inputClass: null,

  /**
   * @private
   * Some CSS properties can be used to improve the working of Hammer.
   * Add them to this method and they will be set when creating a new Manager.
   * @namespace
   */
  cssProps: {
    /**
     * @private
     * Disables text selection to improve the dragging gesture. Mainly for desktop browsers.
     * @type {String}
     * @default 'none'
     */
    userSelect: "none",

    /**
     * @private
     * Disable the Windows Phone grippers when pressing an element.
     * @type {String}
     * @default 'none'
     */
    touchSelect: "none",

    /**
     * @private
     * Disables the default callout shown when you touch and hold a touch target.
     * On iOS, when you touch and hold a touch target such as a link, Safari displays
     * a callout containing information about the link. This property allows you to disable that callout.
     * @type {String}
     * @default 'none'
     */
    touchCallout: "none",

    /**
     * @private
     * Specifies whether zooming is enabled. Used by IE10>
     * @type {String}
     * @default 'none'
     */
    contentZooming: "none",

    /**
     * @private
     * Specifies that an entire element should be draggable instead of its contents. Mainly for desktop browsers.
     * @type {String}
     * @default 'none'
     */
    userDrag: "none",

    /**
     * @private
     * Overrides the highlight color shown when the user taps a link or a JavaScript
     * clickable element in iOS. This property obeys the alpha value, if specified.
     * @type {String}
     * @default 'rgba(0,0,0,0)'
     */
    tapHighlightColor: "rgba(0,0,0,0)"
  }
};
/**
 * @private
 * Default recognizer setup when calling `Hammer()`
 * When creating a new Manager these will be skipped.
 * This is separated with other defaults because of tree-shaking.
 * @type {Array}
 */

var preset = [[RotateRecognizer, {
  enable: false
}], [PinchRecognizer, {
  enable: false
}, ['rotate']], [SwipeRecognizer, {
  direction: DIRECTION_HORIZONTAL
}], [PanRecognizer, {
  direction: DIRECTION_HORIZONTAL
}, ['swipe']], [TapRecognizer], [TapRecognizer, {
  event: 'doubletap',
  taps: 2
}, ['tap']], [PressRecognizer]];

var STOP = 1;
var FORCED_STOP = 2;
/**
 * @private
 * add/remove the css properties as defined in manager.options.cssProps
 * @param {Manager} manager
 * @param {Boolean} add
 */

function toggleCssProps(manager, add) {
  var element = manager.element;

  if (!element.style) {
    return;
  }

  var prop;
  each(manager.options.cssProps, function (value, name) {
    prop = prefixed(element.style, name);

    if (add) {
      manager.oldCssProps[prop] = element.style[prop];
      element.style[prop] = value;
    } else {
      element.style[prop] = manager.oldCssProps[prop] || "";
    }
  });

  if (!add) {
    manager.oldCssProps = {};
  }
}
/**
 * @private
 * trigger dom event
 * @param {String} event
 * @param {Object} data
 */


function triggerDomEvent(event, data) {
  var gestureEvent = document.createEvent("Event");
  gestureEvent.initEvent(event, true, true);
  gestureEvent.gesture = data;
  data.target.dispatchEvent(gestureEvent);
}
/**
* @private
 * Manager
 * @param {HTMLElement} element
 * @param {Object} [options]
 * @constructor
 */


var Manager =
/*#__PURE__*/
function () {
  function Manager(element, options) {
    var _this = this;

    this.options = assign$1({}, defaults, options || {});
    this.options.inputTarget = this.options.inputTarget || element;
    this.handlers = {};
    this.session = {};
    this.recognizers = [];
    this.oldCssProps = {};
    this.element = element;
    this.input = createInputInstance(this);
    this.touchAction = new TouchAction(this, this.options.touchAction);
    toggleCssProps(this, true);
    each(this.options.recognizers, function (item) {
      var recognizer = _this.add(new item[0](item[1]));

      item[2] && recognizer.recognizeWith(item[2]);
      item[3] && recognizer.requireFailure(item[3]);
    }, this);
  }
  /**
   * @private
   * set options
   * @param {Object} options
   * @returns {Manager}
   */


  var _proto = Manager.prototype;

  _proto.set = function set(options) {
    assign$1(this.options, options); // Options that need a little more setup

    if (options.touchAction) {
      this.touchAction.update();
    }

    if (options.inputTarget) {
      // Clean up existing event listeners and reinitialize
      this.input.destroy();
      this.input.target = options.inputTarget;
      this.input.init();
    }

    return this;
  };
  /**
   * @private
   * stop recognizing for this session.
   * This session will be discarded, when a new [input]start event is fired.
   * When forced, the recognizer cycle is stopped immediately.
   * @param {Boolean} [force]
   */


  _proto.stop = function stop(force) {
    this.session.stopped = force ? FORCED_STOP : STOP;
  };
  /**
   * @private
   * run the recognizers!
   * called by the inputHandler function on every movement of the pointers (touches)
   * it walks through all the recognizers and tries to detect the gesture that is being made
   * @param {Object} inputData
   */


  _proto.recognize = function recognize(inputData) {
    var session = this.session;

    if (session.stopped) {
      return;
    } // run the touch-action polyfill


    this.touchAction.preventDefaults(inputData);
    var recognizer;
    var recognizers = this.recognizers; // this holds the recognizer that is being recognized.
    // so the recognizer's state needs to be BEGAN, CHANGED, ENDED or RECOGNIZED
    // if no recognizer is detecting a thing, it is set to `null`

    var curRecognizer = session.curRecognizer; // reset when the last recognizer is recognized
    // or when we're in a new session

    if (!curRecognizer || curRecognizer && curRecognizer.state & STATE_RECOGNIZED) {
      session.curRecognizer = null;
      curRecognizer = null;
    }

    var i = 0;

    while (i < recognizers.length) {
      recognizer = recognizers[i]; // find out if we are allowed try to recognize the input for this one.
      // 1.   allow if the session is NOT forced stopped (see the .stop() method)
      // 2.   allow if we still haven't recognized a gesture in this session, or the this recognizer is the one
      //      that is being recognized.
      // 3.   allow if the recognizer is allowed to run simultaneous with the current recognized recognizer.
      //      this can be setup with the `recognizeWith()` method on the recognizer.

      if (session.stopped !== FORCED_STOP && ( // 1
      !curRecognizer || recognizer === curRecognizer || // 2
      recognizer.canRecognizeWith(curRecognizer))) {
        // 3
        recognizer.recognize(inputData);
      } else {
        recognizer.reset();
      } // if the recognizer has been recognizing the input as a valid gesture, we want to store this one as the
      // current active recognizer. but only if we don't already have an active recognizer


      if (!curRecognizer && recognizer.state & (STATE_BEGAN | STATE_CHANGED | STATE_ENDED)) {
        session.curRecognizer = recognizer;
        curRecognizer = recognizer;
      }

      i++;
    }
  };
  /**
   * @private
   * get a recognizer by its event name.
   * @param {Recognizer|String} recognizer
   * @returns {Recognizer|Null}
   */


  _proto.get = function get(recognizer) {
    if (recognizer instanceof Recognizer) {
      return recognizer;
    }

    var recognizers = this.recognizers;

    for (var i = 0; i < recognizers.length; i++) {
      if (recognizers[i].options.event === recognizer) {
        return recognizers[i];
      }
    }

    return null;
  };
  /**
   * @private add a recognizer to the manager
   * existing recognizers with the same event name will be removed
   * @param {Recognizer} recognizer
   * @returns {Recognizer|Manager}
   */


  _proto.add = function add(recognizer) {
    if (invokeArrayArg(recognizer, "add", this)) {
      return this;
    } // remove existing


    var existing = this.get(recognizer.options.event);

    if (existing) {
      this.remove(existing);
    }

    this.recognizers.push(recognizer);
    recognizer.manager = this;
    this.touchAction.update();
    return recognizer;
  };
  /**
   * @private
   * remove a recognizer by name or instance
   * @param {Recognizer|String} recognizer
   * @returns {Manager}
   */


  _proto.remove = function remove(recognizer) {
    if (invokeArrayArg(recognizer, "remove", this)) {
      return this;
    }

    var targetRecognizer = this.get(recognizer); // let's make sure this recognizer exists

    if (recognizer) {
      var recognizers = this.recognizers;
      var index = inArray(recognizers, targetRecognizer);

      if (index !== -1) {
        recognizers.splice(index, 1);
        this.touchAction.update();
      }
    }

    return this;
  };
  /**
   * @private
   * bind event
   * @param {String} events
   * @param {Function} handler
   * @returns {EventEmitter} this
   */


  _proto.on = function on(events, handler) {
    if (events === undefined || handler === undefined) {
      return this;
    }

    var handlers = this.handlers;
    each(splitStr(events), function (event) {
      handlers[event] = handlers[event] || [];
      handlers[event].push(handler);
    });
    return this;
  };
  /**
   * @private unbind event, leave emit blank to remove all handlers
   * @param {String} events
   * @param {Function} [handler]
   * @returns {EventEmitter} this
   */


  _proto.off = function off(events, handler) {
    if (events === undefined) {
      return this;
    }

    var handlers = this.handlers;
    each(splitStr(events), function (event) {
      if (!handler) {
        delete handlers[event];
      } else {
        handlers[event] && handlers[event].splice(inArray(handlers[event], handler), 1);
      }
    });
    return this;
  };
  /**
   * @private emit event to the listeners
   * @param {String} event
   * @param {Object} data
   */


  _proto.emit = function emit(event, data) {
    // we also want to trigger dom events
    if (this.options.domEvents) {
      triggerDomEvent(event, data);
    } // no handlers, so skip it all


    var handlers = this.handlers[event] && this.handlers[event].slice();

    if (!handlers || !handlers.length) {
      return;
    }

    data.type = event;

    data.preventDefault = function () {
      data.srcEvent.preventDefault();
    };

    var i = 0;

    while (i < handlers.length) {
      handlers[i](data);
      i++;
    }
  };
  /**
   * @private
   * destroy the manager and unbinds all events
   * it doesn't unbind dom events, that is the user own responsibility
   */


  _proto.destroy = function destroy() {
    this.element && toggleCssProps(this, false);
    this.handlers = {};
    this.session = {};
    this.input.destroy();
    this.element = null;
  };

  return Manager;
}();

var SINGLE_TOUCH_INPUT_MAP = {
  touchstart: INPUT_START,
  touchmove: INPUT_MOVE,
  touchend: INPUT_END,
  touchcancel: INPUT_CANCEL
};
var SINGLE_TOUCH_TARGET_EVENTS = 'touchstart';
var SINGLE_TOUCH_WINDOW_EVENTS = 'touchstart touchmove touchend touchcancel';
/**
 * @private
 * Touch events input
 * @constructor
 * @extends Input
 */

var SingleTouchInput =
/*#__PURE__*/
function (_Input) {
  _inheritsLoose(SingleTouchInput, _Input);

  function SingleTouchInput() {
    var _this;

    var proto = SingleTouchInput.prototype;
    proto.evTarget = SINGLE_TOUCH_TARGET_EVENTS;
    proto.evWin = SINGLE_TOUCH_WINDOW_EVENTS;
    _this = _Input.apply(this, arguments) || this;
    _this.started = false;
    return _this;
  }

  var _proto = SingleTouchInput.prototype;

  _proto.handler = function handler(ev) {
    var type = SINGLE_TOUCH_INPUT_MAP[ev.type]; // should we handle the touch events?

    if (type === INPUT_START) {
      this.started = true;
    }

    if (!this.started) {
      return;
    }

    var touches = normalizeSingleTouches.call(this, ev, type); // when done, reset the started state

    if (type & (INPUT_END | INPUT_CANCEL) && touches[0].length - touches[1].length === 0) {
      this.started = false;
    }

    this.callback(this.manager, type, {
      pointers: touches[0],
      changedPointers: touches[1],
      pointerType: INPUT_TYPE_TOUCH,
      srcEvent: ev
    });
  };

  return SingleTouchInput;
}(Input);

function normalizeSingleTouches(ev, type) {
  var all = toArray$1(ev.touches);
  var changed = toArray$1(ev.changedTouches);

  if (type & (INPUT_END | INPUT_CANCEL)) {
    all = uniqueArray(all.concat(changed), 'identifier', true);
  }

  return [all, changed];
}

/**
 * @private
 * wrap a method with a deprecation warning and stack trace
 * @param {Function} method
 * @param {String} name
 * @param {String} message
 * @returns {Function} A new function wrapping the supplied method.
 */
function deprecate(method, name, message) {
  var deprecationMessage = "DEPRECATED METHOD: " + name + "\n" + message + " AT \n";
  return function () {
    var e = new Error('get-stack-trace');
    var stack = e && e.stack ? e.stack.replace(/^[^\(]+?[\n$]/gm, '').replace(/^\s+at\s+/gm, '').replace(/^Object.<anonymous>\s*\(/gm, '{anonymous}()@') : 'Unknown Stack Trace';
    var log = window.console && (window.console.warn || window.console.log);

    if (log) {
      log.call(window.console, deprecationMessage, stack);
    }

    return method.apply(this, arguments);
  };
}

/**
 * @private
 * extend object.
 * means that properties in dest will be overwritten by the ones in src.
 * @param {Object} dest
 * @param {Object} src
 * @param {Boolean} [merge=false]
 * @returns {Object} dest
 */

var extend$1 = deprecate(function (dest, src, merge) {
  var keys = Object.keys(src);
  var i = 0;

  while (i < keys.length) {
    if (!merge || merge && dest[keys[i]] === undefined) {
      dest[keys[i]] = src[keys[i]];
    }

    i++;
  }

  return dest;
}, 'extend', 'Use `assign`.');

/**
 * @private
 * merge the values from src in the dest.
 * means that properties that exist in dest will not be overwritten by src
 * @param {Object} dest
 * @param {Object} src
 * @returns {Object} dest
 */

var merge = deprecate(function (dest, src) {
  return extend$1(dest, src, true);
}, 'merge', 'Use `assign`.');

/**
 * @private
 * simple class inheritance
 * @param {Function} child
 * @param {Function} base
 * @param {Object} [properties]
 */

function inherit(child, base, properties) {
  var baseP = base.prototype;
  var childP;
  childP = child.prototype = Object.create(baseP);
  childP.constructor = child;
  childP._super = baseP;

  if (properties) {
    assign$1(childP, properties);
  }
}

/**
 * @private
 * simple function bind
 * @param {Function} fn
 * @param {Object} context
 * @returns {Function}
 */
function bindFn(fn, context) {
  return function boundFn() {
    return fn.apply(context, arguments);
  };
}

/**
 * @private
 * Simple way to create a manager with a default set of recognizers.
 * @param {HTMLElement} element
 * @param {Object} [options]
 * @constructor
 */

var Hammer$3 =
/*#__PURE__*/
function () {
  var Hammer =
  /**
    * @private
    * @const {string}
    */
  function Hammer(element, options) {
    if (options === void 0) {
      options = {};
    }

    return new Manager(element, _extends({
      recognizers: preset.concat()
    }, options));
  };

  Hammer.VERSION = "2.0.17-rc";
  Hammer.DIRECTION_ALL = DIRECTION_ALL;
  Hammer.DIRECTION_DOWN = DIRECTION_DOWN;
  Hammer.DIRECTION_LEFT = DIRECTION_LEFT;
  Hammer.DIRECTION_RIGHT = DIRECTION_RIGHT;
  Hammer.DIRECTION_UP = DIRECTION_UP;
  Hammer.DIRECTION_HORIZONTAL = DIRECTION_HORIZONTAL;
  Hammer.DIRECTION_VERTICAL = DIRECTION_VERTICAL;
  Hammer.DIRECTION_NONE = DIRECTION_NONE;
  Hammer.DIRECTION_DOWN = DIRECTION_DOWN;
  Hammer.INPUT_START = INPUT_START;
  Hammer.INPUT_MOVE = INPUT_MOVE;
  Hammer.INPUT_END = INPUT_END;
  Hammer.INPUT_CANCEL = INPUT_CANCEL;
  Hammer.STATE_POSSIBLE = STATE_POSSIBLE;
  Hammer.STATE_BEGAN = STATE_BEGAN;
  Hammer.STATE_CHANGED = STATE_CHANGED;
  Hammer.STATE_ENDED = STATE_ENDED;
  Hammer.STATE_RECOGNIZED = STATE_RECOGNIZED;
  Hammer.STATE_CANCELLED = STATE_CANCELLED;
  Hammer.STATE_FAILED = STATE_FAILED;
  Hammer.Manager = Manager;
  Hammer.Input = Input;
  Hammer.TouchAction = TouchAction;
  Hammer.TouchInput = TouchInput;
  Hammer.MouseInput = MouseInput;
  Hammer.PointerEventInput = PointerEventInput;
  Hammer.TouchMouseInput = TouchMouseInput;
  Hammer.SingleTouchInput = SingleTouchInput;
  Hammer.Recognizer = Recognizer;
  Hammer.AttrRecognizer = AttrRecognizer;
  Hammer.Tap = TapRecognizer;
  Hammer.Pan = PanRecognizer;
  Hammer.Swipe = SwipeRecognizer;
  Hammer.Pinch = PinchRecognizer;
  Hammer.Rotate = RotateRecognizer;
  Hammer.Press = PressRecognizer;
  Hammer.on = addEventListeners;
  Hammer.off = removeEventListeners;
  Hammer.each = each;
  Hammer.merge = merge;
  Hammer.extend = extend$1;
  Hammer.bindFn = bindFn;
  Hammer.assign = assign$1;
  Hammer.inherit = inherit;
  Hammer.bindFn = bindFn;
  Hammer.prefixed = prefixed;
  Hammer.toArray = toArray$1;
  Hammer.inArray = inArray;
  Hammer.uniqueArray = uniqueArray;
  Hammer.splitStr = splitStr;
  Hammer.boolOrFn = boolOrFn;
  Hammer.hasParent = hasParent$1;
  Hammer.addEventListeners = addEventListeners;
  Hammer.removeEventListeners = removeEventListeners;
  Hammer.defaults = assign$1({}, defaults, {
    preset: preset
  });
  return Hammer;
}();

//  style loader but by script tag, not by the loader.

Hammer$3.defaults;

/**
 * Use this symbol to delete properies in deepObjectAssign.
 */
const DELETE = _Symbol("DELETE");
/**
 * Pure version of deepObjectAssign, it doesn't modify any of it's arguments.
 * @param base - The base object that fullfils the whole interface T.
 * @param updates - Updates that may change or delete props.
 * @returns A brand new instance with all the supplied objects deeply merged.
 */
function pureDeepObjectAssign(base) {
  for (var _len = arguments.length, updates = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
    updates[_key - 1] = arguments[_key];
  }
  return deepObjectAssign({}, base, ...updates);
}
/**
 * Deep version of object assign with additional deleting by the DELETE symbol.
 * @param values - Objects to be deeply merged.
 * @returns The first object from values.
 */
function deepObjectAssign() {
  const merged = deepObjectAssignNonentry(...arguments);
  stripDelete(merged);
  return merged;
}
/**
 * Deep version of object assign with additional deleting by the DELETE symbol.
 * @remarks
 * This doesn't strip the DELETE symbols so they may end up in the final object.
 * @param values - Objects to be deeply merged.
 * @returns The first object from values.
 */
function deepObjectAssignNonentry() {
  for (var _len2 = arguments.length, values = new Array(_len2), _key2 = 0; _key2 < _len2; _key2++) {
    values[_key2] = arguments[_key2];
  }
  if (values.length < 2) {
    return values[0];
  } else if (values.length > 2) {
    return deepObjectAssignNonentry(deepObjectAssign(values[0], values[1]), ..._sliceInstanceProperty(values).call(values, 2));
  }
  const a = values[0];
  const b = values[1];
  if (a instanceof Date && b instanceof Date) {
    a.setTime(b.getTime());
    return a;
  }
  for (const prop of _Reflect$ownKeys(b)) {
    if (!Object.prototype.propertyIsEnumerable.call(b, prop)) ;else if (b[prop] === DELETE) {
      delete a[prop];
    } else if (a[prop] !== null && b[prop] !== null && typeof a[prop] === "object" && typeof b[prop] === "object" && !_Array$isArray(a[prop]) && !_Array$isArray(b[prop])) {
      a[prop] = deepObjectAssignNonentry(a[prop], b[prop]);
    } else {
      a[prop] = clone(b[prop]);
    }
  }
  return a;
}
/**
 * Deep clone given object or array. In case of primitive simply return.
 * @param a - Anything.
 * @returns Deep cloned object/array or unchanged a.
 */
function clone(a) {
  if (_Array$isArray(a)) {
    return _mapInstanceProperty(a).call(a, value => clone(value));
  } else if (typeof a === "object" && a !== null) {
    if (a instanceof Date) {
      return new Date(a.getTime());
    }
    return deepObjectAssignNonentry({}, a);
  } else {
    return a;
  }
}
/**
 * Strip DELETE from given object.
 * @param a - Object which may contain DELETE but won't after this is executed.
 */
function stripDelete(a) {
  for (const prop of _Object$keys(a)) {
    if (a[prop] === DELETE) {
      delete a[prop];
    } else if (typeof a[prop] === "object" && a[prop] !== null) {
      stripDelete(a[prop]);
    }
  }
}

/**
 * Seedable, fast and reasonably good (not crypto but more than okay for our
 * needs) random number generator.
 * @remarks
 * Adapted from {@link https://web.archive.org/web/20110429100736/http://baagoe.com:80/en/RandomMusings/javascript}.
 * Original algorithm created by Johannes Baagøe \<baagoe\@baagoe.com\> in 2010.
 */
/**
 * Create a seeded pseudo random generator based on Alea by Johannes Baagøe.
 * @param seed - All supplied arguments will be used as a seed. In case nothing
 * is supplied the current time will be used to seed the generator.
 * @returns A ready to use seeded generator.
 */
function Alea() {
  for (var _len3 = arguments.length, seed = new Array(_len3), _key3 = 0; _key3 < _len3; _key3++) {
    seed[_key3] = arguments[_key3];
  }
  return AleaImplementation(seed.length ? seed : [_Date$now()]);
}
/**
 * An implementation of [[Alea]] without user input validation.
 * @param seed - The data that will be used to seed the generator.
 * @returns A ready to use seeded generator.
 */
function AleaImplementation(seed) {
  let [s0, s1, s2] = mashSeed(seed);
  let c = 1;
  const random = () => {
    const t = 2091639 * s0 + c * 2.3283064365386963e-10; // 2^-32
    s0 = s1;
    s1 = s2;
    return s2 = t - (c = t | 0);
  };
  random.uint32 = () => random() * 0x100000000; // 2^32
  random.fract53 = () => random() + (random() * 0x200000 | 0) * 1.1102230246251565e-16; // 2^-53
  random.algorithm = "Alea";
  random.seed = seed;
  random.version = "0.9";
  return random;
}
/**
 * Turn arbitrary data into values [[AleaImplementation]] can use to generate
 * random numbers.
 * @param seed - Arbitrary data that will be used as the seed.
 * @returns Three numbers to use as initial values for [[AleaImplementation]].
 */
function mashSeed() {
  const mash = Mash();
  let s0 = mash(" ");
  let s1 = mash(" ");
  let s2 = mash(" ");
  for (let i = 0; i < arguments.length; i++) {
    s0 -= mash(i < 0 || arguments.length <= i ? undefined : arguments[i]);
    if (s0 < 0) {
      s0 += 1;
    }
    s1 -= mash(i < 0 || arguments.length <= i ? undefined : arguments[i]);
    if (s1 < 0) {
      s1 += 1;
    }
    s2 -= mash(i < 0 || arguments.length <= i ? undefined : arguments[i]);
    if (s2 < 0) {
      s2 += 1;
    }
  }
  return [s0, s1, s2];
}
/**
 * Create a new mash function.
 * @returns A nonpure function that takes arbitrary [[Mashable]] data and turns
 * them into numbers.
 */
function Mash() {
  let n = 0xefc8249d;
  return function (data) {
    const string = data.toString();
    for (let i = 0; i < string.length; i++) {
      n += string.charCodeAt(i);
      let h = 0.02519603282416938 * n;
      n = h >>> 0;
      h -= n;
      h *= n;
      n = h >>> 0;
      h -= n;
      n += h * 0x100000000; // 2^32
    }
    return (n >>> 0) * 2.3283064365386963e-10; // 2^-32
  };
}

/**
 * Setup a mock hammer.js object, for unit testing.
 *
 * Inspiration: https://github.com/uber/deck.gl/pull/658
 * @returns {{on: noop, off: noop, destroy: noop, emit: noop, get: get}}
 */
function hammerMock$1() {
  const noop = () => {};
  return {
    on: noop,
    off: noop,
    destroy: noop,
    emit: noop,
    get() {
      return {
        set: noop
      };
    }
  };
}
const Hammer$1 = typeof window !== "undefined" ? window.Hammer || Hammer$3 : function () {
  // hammer.js is only available in a browser, not in node.js. Replacing it with a mock object.
  return hammerMock$1();
};

/**
 * Turn an element into an clickToUse element.
 * When not active, the element has a transparent overlay. When the overlay is
 * clicked, the mode is changed to active.
 * When active, the element is displayed with a blue border around it, and
 * the interactive contents of the element can be used. When clicked outside
 * the element, the elements mode is changed to inactive.
 * @param {Element} container
 * @class Activator
 */
function Activator$1(container) {
  var _context;
  this._cleanupQueue = [];
  this.active = false;
  this._dom = {
    container,
    overlay: document.createElement("div")
  };
  this._dom.overlay.classList.add("vis-overlay");
  this._dom.container.appendChild(this._dom.overlay);
  this._cleanupQueue.push(() => {
    this._dom.overlay.parentNode.removeChild(this._dom.overlay);
  });
  const hammer = Hammer$1(this._dom.overlay);
  hammer.on("tap", _bindInstanceProperty(_context = this._onTapOverlay).call(_context, this));
  this._cleanupQueue.push(() => {
    hammer.destroy();
    // FIXME: cleaning up hammer instances doesn't work (Timeline not removed
    // from memory)
  });

  // block all touch events (except tap)
  const events = ["tap", "doubletap", "press", "pinch", "pan", "panstart", "panmove", "panend"];
  _forEachInstanceProperty(events).call(events, event => {
    hammer.on(event, event => {
      event.srcEvent.stopPropagation();
    });
  });

  // attach a click event to the window, in order to deactivate when clicking outside the timeline
  if (document && document.body) {
    this._onClick = event => {
      if (!_hasParent$1(event.target, container)) {
        this.deactivate();
      }
    };
    document.body.addEventListener("click", this._onClick);
    this._cleanupQueue.push(() => {
      document.body.removeEventListener("click", this._onClick);
    });
  }

  // prepare escape key listener for deactivating when active
  this._escListener = event => {
    if ("key" in event ? event.key === "Escape" : event.keyCode === 27 /* the keyCode is for IE11 */) {
      this.deactivate();
    }
  };
}

// turn into an event emitter
Emitter(Activator$1.prototype);

// The currently active activator
Activator$1.current = null;

/**
 * Destroy the activator. Cleans up all created DOM and event listeners
 */
Activator$1.prototype.destroy = function () {
  this.deactivate();
  for (const callback of _reverseInstanceProperty(_context2 = _spliceInstanceProperty(_context3 = this._cleanupQueue).call(_context3, 0)).call(_context2)) {
    var _context2, _context3;
    callback();
  }
};

/**
 * Activate the element
 * Overlay is hidden, element is decorated with a blue shadow border
 */
Activator$1.prototype.activate = function () {
  // we allow only one active activator at a time
  if (Activator$1.current) {
    Activator$1.current.deactivate();
  }
  Activator$1.current = this;
  this.active = true;
  this._dom.overlay.style.display = "none";
  this._dom.container.classList.add("vis-active");
  this.emit("change");
  this.emit("activate");

  // ugly hack: bind ESC after emitting the events, as the Network rebinds all
  // keyboard events on a 'change' event
  document.body.addEventListener("keydown", this._escListener);
};

/**
 * Deactivate the element
 * Overlay is displayed on top of the element
 */
Activator$1.prototype.deactivate = function () {
  this.active = false;
  this._dom.overlay.style.display = "block";
  this._dom.container.classList.remove("vis-active");
  document.body.removeEventListener("keydown", this._escListener);
  this.emit("change");
  this.emit("deactivate");
};

/**
 * Handle a tap event: activate the container
 * @param {Event}  event   The event
 * @private
 */
Activator$1.prototype._onTapOverlay = function (event) {
  // activate the container
  this.activate();
  event.srcEvent.stopPropagation();
};

/**
 * Test whether the element has the requested parent element somewhere in
 * its chain of parent nodes.
 * @param {HTMLElement} element
 * @param {HTMLElement} parent
 * @returns {boolean} Returns true when the parent is found somewhere in the
 *                    chain of parent nodes.
 * @private
 */
function _hasParent$1(element, parent) {
  while (element) {
    if (element === parent) {
      return true;
    }
    element = element.parentNode;
  }
  return false;
}

// utility functions
// parse ASP.Net Date pattern,
// for example '/Date(1198908717056)/' or '/Date(1198908717056-0700)/'
// code from http://momentjs.com/
const ASPDateRegex$1 = /^\/?Date\((-?\d+)/i;
// Color REs
const fullHexRE = /^#?([a-f\d]{2})([a-f\d]{2})([a-f\d]{2})$/i;
const shortHexRE = /^#?([a-f\d])([a-f\d])([a-f\d])$/i;
const rgbRE = /^rgb\( *(1?\d{1,2}|2[0-4]\d|25[0-5]) *, *(1?\d{1,2}|2[0-4]\d|25[0-5]) *, *(1?\d{1,2}|2[0-4]\d|25[0-5]) *\)$/i;
const rgbaRE = /^rgba\( *(1?\d{1,2}|2[0-4]\d|25[0-5]) *, *(1?\d{1,2}|2[0-4]\d|25[0-5]) *, *(1?\d{1,2}|2[0-4]\d|25[0-5]) *, *([01]|0?\.\d+) *\)$/i;
/**
 * Test whether given object is a number.
 * @param value - Input value of unknown type.
 * @returns True if number, false otherwise.
 */
function isNumber(value) {
  return value instanceof Number || typeof value === "number";
}
/**
 * Remove everything in the DOM object.
 * @param DOMobject - Node whose child nodes will be recursively deleted.
 */
function recursiveDOMDelete(DOMobject) {
  if (DOMobject) {
    while (DOMobject.hasChildNodes() === true) {
      const child = DOMobject.firstChild;
      if (child) {
        recursiveDOMDelete(child);
        DOMobject.removeChild(child);
      }
    }
  }
}
/**
 * Test whether given object is a string.
 * @param value - Input value of unknown type.
 * @returns True if string, false otherwise.
 */
function isString(value) {
  return value instanceof String || typeof value === "string";
}
/**
 * Test whether given object is a object (not primitive or null).
 * @param value - Input value of unknown type.
 * @returns True if not null object, false otherwise.
 */
function isObject(value) {
  return typeof value === "object" && value !== null;
}
/**
 * Test whether given object is a Date, or a String containing a Date.
 * @param value - Input value of unknown type.
 * @returns True if Date instance or string date representation, false otherwise.
 */
function isDate(value) {
  if (value instanceof Date) {
    return true;
  } else if (isString(value)) {
    // test whether this string contains a date
    const match = ASPDateRegex$1.exec(value);
    if (match) {
      return true;
    } else if (!isNaN(Date.parse(value))) {
      return true;
    }
  }
  return false;
}
/**
 * Copy property from b to a if property present in a.
 * If property in b explicitly set to null, delete it if `allowDeletion` set.
 *
 * Internal helper routine, should not be exported. Not added to `exports` for that reason.
 * @param a - Target object.
 * @param b - Source object.
 * @param prop - Name of property to copy from b to a.
 * @param allowDeletion - If true, delete property in a if explicitly set to null in b.
 */
function copyOrDelete(a, b, prop, allowDeletion) {
  let doDeletion = false;
  if (allowDeletion === true) {
    doDeletion = b[prop] === null && a[prop] !== undefined;
  }
  if (doDeletion) {
    delete a[prop];
  } else {
    a[prop] = b[prop]; // Remember, this is a reference copy!
  }
}
/**
 * Fill an object with a possibly partially defined other object.
 *
 * Only copies values for the properties already present in a.
 * That means an object is not created on a property if only the b object has it.
 * @param a - The object that will have it's properties updated.
 * @param b - The object with property updates.
 * @param allowDeletion - If true, delete properties in a that are explicitly set to null in b.
 */
function fillIfDefined(a, b) {
  let allowDeletion = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : false;
  // NOTE: iteration of properties of a
  // NOTE: prototype properties iterated over as well
  for (const prop in a) {
    if (b[prop] !== undefined) {
      if (b[prop] === null || typeof b[prop] !== "object") {
        // Note: typeof null === 'object'
        copyOrDelete(a, b, prop, allowDeletion);
      } else {
        const aProp = a[prop];
        const bProp = b[prop];
        if (isObject(aProp) && isObject(bProp)) {
          fillIfDefined(aProp, bProp, allowDeletion);
        }
      }
    }
  }
}
/**
 * Copy the values of all of the enumerable own properties from one or more source objects to a
 * target object. Returns the target object.
 * @param target - The target object to copy to.
 * @param source - The source object from which to copy properties.
 * @returns The target object.
 */
const extend = _Object$assign;
/**
 * Extend object a with selected properties of object b or a series of objects.
 * @remarks
 * Only properties with defined values are copied.
 * @param props - Properties to be copied to a.
 * @param a - The target.
 * @param others - The sources.
 * @returns Argument a.
 */
function selectiveExtend(props, a) {
  if (!_Array$isArray(props)) {
    throw new Error("Array with property names expected as first argument");
  }
  for (var _len4 = arguments.length, others = new Array(_len4 > 2 ? _len4 - 2 : 0), _key4 = 2; _key4 < _len4; _key4++) {
    others[_key4 - 2] = arguments[_key4];
  }
  for (const other of others) {
    for (let p = 0; p < props.length; p++) {
      const prop = props[p];
      if (other && Object.prototype.hasOwnProperty.call(other, prop)) {
        a[prop] = other[prop];
      }
    }
  }
  return a;
}
/**
 * Extend object a with selected properties of object b.
 * Only properties with defined values are copied.
 * @remarks
 * Previous version of this routine implied that multiple source objects could
 * be used; however, the implementation was **wrong**. Since multiple (\>1)
 * sources weren't used anywhere in the `vis.js` code, this has been removed
 * @param props - Names of first-level properties to copy over.
 * @param a - Target object.
 * @param b - Source object.
 * @param allowDeletion - If true, delete property in a if explicitly set to null in b.
 * @returns Argument a.
 */
function selectiveDeepExtend(props, a, b) {
  let allowDeletion = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : false;
  // TODO: add support for Arrays to deepExtend
  if (_Array$isArray(b)) {
    throw new TypeError("Arrays are not supported by deepExtend");
  }
  for (let p = 0; p < props.length; p++) {
    const prop = props[p];
    if (Object.prototype.hasOwnProperty.call(b, prop)) {
      if (b[prop] && b[prop].constructor === Object) {
        if (a[prop] === undefined) {
          a[prop] = {};
        }
        if (a[prop].constructor === Object) {
          deepExtend(a[prop], b[prop], false, allowDeletion);
        } else {
          copyOrDelete(a, b, prop, allowDeletion);
        }
      } else if (_Array$isArray(b[prop])) {
        throw new TypeError("Arrays are not supported by deepExtend");
      } else {
        copyOrDelete(a, b, prop, allowDeletion);
      }
    }
  }
  return a;
}
/**
 * Extend object `a` with properties of object `b`, ignoring properties which
 * are explicitly specified to be excluded.
 * @remarks
 * The properties of `b` are considered for copying. Properties which are
 * themselves objects are are also extended. Only properties with defined
 * values are copied.
 * @param propsToExclude - Names of properties which should *not* be copied.
 * @param a - Object to extend.
 * @param b - Object to take properties from for extension.
 * @param allowDeletion - If true, delete properties in a that are explicitly
 * set to null in b.
 * @returns Argument a.
 */
function selectiveNotDeepExtend(propsToExclude, a, b) {
  let allowDeletion = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : false;
  // TODO: add support for Arrays to deepExtend
  // NOTE: array properties have an else-below; apparently, there is a problem here.
  if (_Array$isArray(b)) {
    throw new TypeError("Arrays are not supported by deepExtend");
  }
  for (const prop in b) {
    if (!Object.prototype.hasOwnProperty.call(b, prop)) {
      continue;
    } // Handle local properties only
    if (_includesInstanceProperty(propsToExclude).call(propsToExclude, prop)) {
      continue;
    } // In exclusion list, skip
    if (b[prop] && b[prop].constructor === Object) {
      if (a[prop] === undefined) {
        a[prop] = {};
      }
      if (a[prop].constructor === Object) {
        deepExtend(a[prop], b[prop]); // NOTE: allowDeletion not propagated!
      } else {
        copyOrDelete(a, b, prop, allowDeletion);
      }
    } else if (_Array$isArray(b[prop])) {
      a[prop] = [];
      for (let i = 0; i < b[prop].length; i++) {
        a[prop].push(b[prop][i]);
      }
    } else {
      copyOrDelete(a, b, prop, allowDeletion);
    }
  }
  return a;
}
/**
 * Deep extend an object a with the properties of object b.
 * @param a - Target object.
 * @param b - Source object.
 * @param protoExtend - If true, the prototype values will also be extended.
 * (That is the options objects that inherit from others will also get the
 * inherited options).
 * @param allowDeletion - If true, the values of fields that are null will be deleted.
 * @returns Argument a.
 */
function deepExtend(a, b) {
  let protoExtend = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : false;
  let allowDeletion = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : false;
  for (const prop in b) {
    if (Object.prototype.hasOwnProperty.call(b, prop) || protoExtend === true) {
      if (typeof b[prop] === "object" && b[prop] !== null && _Object$getPrototypeOf(b[prop]) === Object.prototype) {
        if (a[prop] === undefined) {
          a[prop] = deepExtend({}, b[prop], protoExtend); // NOTE: allowDeletion not propagated!
        } else if (typeof a[prop] === "object" && a[prop] !== null && _Object$getPrototypeOf(a[prop]) === Object.prototype) {
          deepExtend(a[prop], b[prop], protoExtend); // NOTE: allowDeletion not propagated!
        } else {
          copyOrDelete(a, b, prop, allowDeletion);
        }
      } else if (_Array$isArray(b[prop])) {
        var _context4;
        a[prop] = _sliceInstanceProperty(_context4 = b[prop]).call(_context4);
      } else {
        copyOrDelete(a, b, prop, allowDeletion);
      }
    }
  }
  return a;
}
/**
 * Test whether all elements in two arrays are equal.
 * @param a - First array.
 * @param b - Second array.
 * @returns True if both arrays have the same length and same elements (1 = '1').
 */
function equalArray(a, b) {
  if (a.length !== b.length) {
    return false;
  }
  for (let i = 0, len = a.length; i < len; i++) {
    if (a[i] != b[i]) {
      return false;
    }
  }
  return true;
}
/**
 * Get the type of an object, for example exports.getType([]) returns 'Array'.
 * @param object - Input value of unknown type.
 * @returns Detected type.
 */
function getType(object) {
  const type = typeof object;
  if (type === "object") {
    if (object === null) {
      return "null";
    }
    if (object instanceof Boolean) {
      return "Boolean";
    }
    if (object instanceof Number) {
      return "Number";
    }
    if (object instanceof String) {
      return "String";
    }
    if (_Array$isArray(object)) {
      return "Array";
    }
    if (object instanceof Date) {
      return "Date";
    }
    return "Object";
  }
  if (type === "number") {
    return "Number";
  }
  if (type === "boolean") {
    return "Boolean";
  }
  if (type === "string") {
    return "String";
  }
  if (type === undefined) {
    return "undefined";
  }
  return type;
}
/**
 * Used to extend an array and copy it. This is used to propagate paths recursively.
 * @param arr - First part.
 * @param newValue - The value to be aadded into the array.
 * @returns A new array with all items from arr and newValue (which is last).
 */
function copyAndExtendArray(arr, newValue) {
  return [...arr, newValue];
}
/**
 * Used to extend an array and copy it. This is used to propagate paths recursively.
 * @param arr - The array to be copied.
 * @returns Shallow copy of arr.
 */
function copyArray(arr) {
  return _sliceInstanceProperty(arr).call(arr);
}
/**
 * Retrieve the absolute left value of a DOM element.
 * @param elem - A dom element, for example a div.
 * @returns The absolute left position of this element in the browser page.
 */
function getAbsoluteLeft(elem) {
  return elem.getBoundingClientRect().left;
}
/**
 * Retrieve the absolute right value of a DOM element.
 * @param elem - A dom element, for example a div.
 * @returns The absolute right position of this element in the browser page.
 */
function getAbsoluteRight(elem) {
  return elem.getBoundingClientRect().right;
}
/**
 * Retrieve the absolute top value of a DOM element.
 * @param elem - A dom element, for example a div.
 * @returns The absolute top position of this element in the browser page.
 */
function getAbsoluteTop(elem) {
  return elem.getBoundingClientRect().top;
}
/**
 * Add a className to the given elements style.
 * @param elem - The element to which the classes will be added.
 * @param classNames - Space separated list of classes.
 */
function addClassName(elem, classNames) {
  let classes = elem.className.split(" ");
  const newClasses = classNames.split(" ");
  classes = _concatInstanceProperty(classes).call(classes, _filterInstanceProperty(newClasses).call(newClasses, function (className) {
    return !_includesInstanceProperty(classes).call(classes, className);
  }));
  elem.className = classes.join(" ");
}
/**
 * Remove a className from the given elements style.
 * @param elem - The element from which the classes will be removed.
 * @param classNames - Space separated list of classes.
 */
function removeClassName(elem, classNames) {
  let classes = elem.className.split(" ");
  const oldClasses = classNames.split(" ");
  classes = _filterInstanceProperty(classes).call(classes, function (className) {
    return !_includesInstanceProperty(oldClasses).call(oldClasses, className);
  });
  elem.className = classes.join(" ");
}
/**
 * For each method for both arrays and objects.
 * In case of an array, the built-in Array.forEach() is applied (**No, it's not!**).
 * In case of an Object, the method loops over all properties of the object.
 * @param object - An Object or Array to be iterated over.
 * @param callback - Array.forEach-like callback.
 */
function forEach(object, callback) {
  if (_Array$isArray(object)) {
    // array
    const len = object.length;
    for (let i = 0; i < len; i++) {
      callback(object[i], i, object);
    }
  } else {
    // object
    for (const key in object) {
      if (Object.prototype.hasOwnProperty.call(object, key)) {
        callback(object[key], key, object);
      }
    }
  }
}
/**
 * Convert an object into an array: all objects properties are put into the array. The resulting array is unordered.
 * @param o - Object that contains the properties and methods.
 * @returns An array of unordered values.
 */
const toArray = _Object$values;
/**
 * Update a property in an object.
 * @param object - The object whose property will be updated.
 * @param key - Name of the property to be updated.
 * @param value - The new value to be assigned.
 * @returns Whether the value was updated (true) or already strictly the same in the original object (false).
 */
function updateProperty(object, key, value) {
  if (object[key] !== value) {
    object[key] = value;
    return true;
  } else {
    return false;
  }
}
/**
 * Throttle the given function to be only executed once per animation frame.
 * @param fn - The original function.
 * @returns The throttled function.
 */
function throttle(fn) {
  let scheduled = false;
  return () => {
    if (!scheduled) {
      scheduled = true;
      requestAnimationFrame(() => {
        scheduled = false;
        fn();
      });
    }
  };
}
/**
 * Cancels the event's default action if it is cancelable, without stopping further propagation of the event.
 * @param event - The event whose default action should be prevented.
 */
function preventDefault(event) {
  if (!event) {
    event = window.event;
  }
  if (!event) ;else if (event.preventDefault) {
    event.preventDefault(); // non-IE browsers
  } else {
    // @TODO: IE types? Does anyone care?
    event.returnValue = false; // IE browsers
  }
}
/**
 * Get HTML element which is the target of the event.
 * @param event - The event.
 * @returns The element or null if not obtainable.
 */
function getTarget() {
  let event = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : window.event;
  // code from http://www.quirksmode.org/js/events_properties.html
  // @TODO: EventTarget can be almost anything, is it okay to return only Elements?
  let target = null;
  if (!event) ;else if (event.target) {
    target = event.target;
  } else if (event.srcElement) {
    target = event.srcElement;
  }
  if (!(target instanceof Element)) {
    return null;
  }
  if (target.nodeType != null && target.nodeType == 3) {
    // defeat Safari bug
    target = target.parentNode;
    if (!(target instanceof Element)) {
      return null;
    }
  }
  return target;
}
/**
 * Check if given element contains given parent somewhere in the DOM tree.
 * @param element - The element to be tested.
 * @param parent - The ancestor (not necessarily parent) of the element.
 * @returns True if parent is an ancestor of the element, false otherwise.
 */
function hasParent(element, parent) {
  let elem = element;
  while (elem) {
    if (elem === parent) {
      return true;
    } else if (elem.parentNode) {
      elem = elem.parentNode;
    } else {
      return false;
    }
  }
  return false;
}
const option = {
  /**
   * Convert a value into a boolean.
   * @param value - Value to be converted intoboolean, a function will be executed as `(() => unknown)`.
   * @param defaultValue - If the value or the return value of the function == null then this will be returned.
   * @returns Corresponding boolean value, if none then the default value, if none then null.
   */
  asBoolean(value, defaultValue) {
    if (typeof value == "function") {
      value = value();
    }
    if (value != null) {
      return value != false;
    }
    return defaultValue || null;
  },
  /**
   * Convert a value into a number.
   * @param value - Value to be converted intonumber, a function will be executed as `(() => unknown)`.
   * @param defaultValue - If the value or the return value of the function == null then this will be returned.
   * @returns Corresponding **boxed** number value, if none then the default value, if none then null.
   */
  asNumber(value, defaultValue) {
    if (typeof value == "function") {
      value = value();
    }
    if (value != null) {
      return Number(value) || defaultValue || null;
    }
    return defaultValue || null;
  },
  /**
   * Convert a value into a string.
   * @param value - Value to be converted intostring, a function will be executed as `(() => unknown)`.
   * @param defaultValue - If the value or the return value of the function == null then this will be returned.
   * @returns Corresponding **boxed** string value, if none then the default value, if none then null.
   */
  asString(value, defaultValue) {
    if (typeof value == "function") {
      value = value();
    }
    if (value != null) {
      return String(value);
    }
    return defaultValue || null;
  },
  /**
   * Convert a value into a size.
   * @param value - Value to be converted intosize, a function will be executed as `(() => unknown)`.
   * @param defaultValue - If the value or the return value of the function == null then this will be returned.
   * @returns Corresponding string value (number + 'px'), if none then the default value, if none then null.
   */
  asSize(value, defaultValue) {
    if (typeof value == "function") {
      value = value();
    }
    if (isString(value)) {
      return value;
    } else if (isNumber(value)) {
      return value + "px";
    } else {
      return defaultValue || null;
    }
  },
  /**
   * Convert a value into a DOM Element.
   * @param value - Value to be converted into DOM Element, a function will be executed as `(() => unknown)`.
   * @param defaultValue - If the value or the return value of the function == null then this will be returned.
   * @returns The DOM Element, if none then the default value, if none then null.
   */
  asElement(value, defaultValue) {
    if (typeof value == "function") {
      value = value();
    }
    return value || defaultValue || null;
  }
};
/**
 * Convert hex color string into RGB color object.
 * @remarks
 * {@link http://stackoverflow.com/questions/5623838/rgb-to-hex-and-hex-to-rgb}
 * @param hex - Hex color string (3 or 6 digits, with or without #).
 * @returns RGB color object.
 */
function hexToRGB(hex) {
  let result;
  switch (hex.length) {
    case 3:
    case 4:
      result = shortHexRE.exec(hex);
      return result ? {
        r: _parseInt(result[1] + result[1], 16),
        g: _parseInt(result[2] + result[2], 16),
        b: _parseInt(result[3] + result[3], 16)
      } : null;
    case 6:
    case 7:
      result = fullHexRE.exec(hex);
      return result ? {
        r: _parseInt(result[1], 16),
        g: _parseInt(result[2], 16),
        b: _parseInt(result[3], 16)
      } : null;
    default:
      return null;
  }
}
/**
 * This function takes string color in hex or RGB format and adds the opacity, RGBA is passed through unchanged.
 * @param color - The color string (hex, RGB, RGBA).
 * @param opacity - The new opacity.
 * @returns RGBA string, for example 'rgba(255, 0, 127, 0.3)'.
 */
function overrideOpacity(color, opacity) {
  if (_includesInstanceProperty(color).call(color, "rgba")) {
    return color;
  } else if (_includesInstanceProperty(color).call(color, "rgb")) {
    const rgb = color.substr(_indexOfInstanceProperty(color).call(color, "(") + 1).replace(")", "").split(",");
    return "rgba(" + rgb[0] + "," + rgb[1] + "," + rgb[2] + "," + opacity + ")";
  } else {
    const rgb = hexToRGB(color);
    if (rgb == null) {
      return color;
    } else {
      return "rgba(" + rgb.r + "," + rgb.g + "," + rgb.b + "," + opacity + ")";
    }
  }
}
/**
 * Convert RGB \<0, 255\> into hex color string.
 * @param red - Red channel.
 * @param green - Green channel.
 * @param blue - Blue channel.
 * @returns Hex color string (for example: '#0acdc0').
 */
function RGBToHex(red, green, blue) {
  var _context5;
  return "#" + _sliceInstanceProperty(_context5 = ((1 << 24) + (red << 16) + (green << 8) + blue).toString(16)).call(_context5, 1);
}
/**
 * Parse a color property into an object with border, background, and highlight colors.
 * @param inputColor - Shorthand color string or input color object.
 * @param defaultColor - Full color object to fill in missing values in inputColor.
 * @returns Color object.
 */
function parseColor(inputColor, defaultColor) {
  if (isString(inputColor)) {
    let colorStr = inputColor;
    if (isValidRGB(colorStr)) {
      var _context6;
      const rgb = _mapInstanceProperty(_context6 = colorStr.substr(4).substr(0, colorStr.length - 5).split(",")).call(_context6, function (value) {
        return _parseInt(value);
      });
      colorStr = RGBToHex(rgb[0], rgb[1], rgb[2]);
    }
    if (isValidHex(colorStr) === true) {
      const hsv = hexToHSV(colorStr);
      const lighterColorHSV = {
        h: hsv.h,
        s: hsv.s * 0.8,
        v: Math.min(1, hsv.v * 1.02)
      };
      const darkerColorHSV = {
        h: hsv.h,
        s: Math.min(1, hsv.s * 1.25),
        v: hsv.v * 0.8
      };
      const darkerColorHex = HSVToHex(darkerColorHSV.h, darkerColorHSV.s, darkerColorHSV.v);
      const lighterColorHex = HSVToHex(lighterColorHSV.h, lighterColorHSV.s, lighterColorHSV.v);
      return {
        background: colorStr,
        border: darkerColorHex,
        highlight: {
          background: lighterColorHex,
          border: darkerColorHex
        },
        hover: {
          background: lighterColorHex,
          border: darkerColorHex
        }
      };
    } else {
      return {
        background: colorStr,
        border: colorStr,
        highlight: {
          background: colorStr,
          border: colorStr
        },
        hover: {
          background: colorStr,
          border: colorStr
        }
      };
    }
  } else {
    if (defaultColor) {
      const color = {
        background: inputColor.background || defaultColor.background,
        border: inputColor.border || defaultColor.border,
        highlight: isString(inputColor.highlight) ? {
          border: inputColor.highlight,
          background: inputColor.highlight
        } : {
          background: inputColor.highlight && inputColor.highlight.background || defaultColor.highlight.background,
          border: inputColor.highlight && inputColor.highlight.border || defaultColor.highlight.border
        },
        hover: isString(inputColor.hover) ? {
          border: inputColor.hover,
          background: inputColor.hover
        } : {
          border: inputColor.hover && inputColor.hover.border || defaultColor.hover.border,
          background: inputColor.hover && inputColor.hover.background || defaultColor.hover.background
        }
      };
      return color;
    } else {
      const color = {
        background: inputColor.background || undefined,
        border: inputColor.border || undefined,
        highlight: isString(inputColor.highlight) ? {
          border: inputColor.highlight,
          background: inputColor.highlight
        } : {
          background: inputColor.highlight && inputColor.highlight.background || undefined,
          border: inputColor.highlight && inputColor.highlight.border || undefined
        },
        hover: isString(inputColor.hover) ? {
          border: inputColor.hover,
          background: inputColor.hover
        } : {
          border: inputColor.hover && inputColor.hover.border || undefined,
          background: inputColor.hover && inputColor.hover.background || undefined
        }
      };
      return color;
    }
  }
}
/**
 * Convert RGB \<0, 255\> into HSV object.
 * @remarks
 * {@link http://www.javascripter.net/faq/rgb2hsv.htm}
 * @param red - Red channel.
 * @param green - Green channel.
 * @param blue - Blue channel.
 * @returns HSV color object.
 */
function RGBToHSV(red, green, blue) {
  red = red / 255;
  green = green / 255;
  blue = blue / 255;
  const minRGB = Math.min(red, Math.min(green, blue));
  const maxRGB = Math.max(red, Math.max(green, blue));
  // Black-gray-white
  if (minRGB === maxRGB) {
    return {
      h: 0,
      s: 0,
      v: minRGB
    };
  }
  // Colors other than black-gray-white:
  const d = red === minRGB ? green - blue : blue === minRGB ? red - green : blue - red;
  const h = red === minRGB ? 3 : blue === minRGB ? 1 : 5;
  const hue = 60 * (h - d / (maxRGB - minRGB)) / 360;
  const saturation = (maxRGB - minRGB) / maxRGB;
  const value = maxRGB;
  return {
    h: hue,
    s: saturation,
    v: value
  };
}
/**
 * Split a string with css styles into an object with key/values.
 * @param cssText - CSS source code to split into key/value object.
 * @returns Key/value object corresponding to {@link cssText}.
 */
function splitCSSText(cssText) {
  const tmpEllement = document.createElement("div");
  const styles = {};
  tmpEllement.style.cssText = cssText;
  for (let i = 0; i < tmpEllement.style.length; ++i) {
    styles[tmpEllement.style[i]] = tmpEllement.style.getPropertyValue(tmpEllement.style[i]);
  }
  return styles;
}
/**
 * Append a string with css styles to an element.
 * @param element - The element that will receive new styles.
 * @param cssText - The styles to be appended.
 */
function addCssText(element, cssText) {
  const cssStyle = splitCSSText(cssText);
  for (const [key, value] of _Object$entries(cssStyle)) {
    element.style.setProperty(key, value);
  }
}
/**
 * Remove a string with css styles from an element.
 * @param element - The element from which styles should be removed.
 * @param cssText - The styles to be removed.
 */
function removeCssText(element, cssText) {
  const cssStyle = splitCSSText(cssText);
  for (const key of _Object$keys(cssStyle)) {
    element.style.removeProperty(key);
  }
}
/**
 * Convert HSV \<0, 1\> into RGB color object.
 * @remarks
 * {@link https://gist.github.com/mjijackson/5311256}
 * @param h - Hue.
 * @param s - Saturation.
 * @param v - Value.
 * @returns RGB color object.
 */
function HSVToRGB(h, s, v) {
  let r;
  let g;
  let b;
  const i = Math.floor(h * 6);
  const f = h * 6 - i;
  const p = v * (1 - s);
  const q = v * (1 - f * s);
  const t = v * (1 - (1 - f) * s);
  switch (i % 6) {
    case 0:
      r = v, g = t, b = p;
      break;
    case 1:
      r = q, g = v, b = p;
      break;
    case 2:
      r = p, g = v, b = t;
      break;
    case 3:
      r = p, g = q, b = v;
      break;
    case 4:
      r = t, g = p, b = v;
      break;
    case 5:
      r = v, g = p, b = q;
      break;
  }
  return {
    r: Math.floor(r * 255),
    g: Math.floor(g * 255),
    b: Math.floor(b * 255)
  };
}
/**
 * Convert HSV \<0, 1\> into hex color string.
 * @param h - Hue.
 * @param s - Saturation.
 * @param v - Value.
 * @returns Hex color string.
 */
function HSVToHex(h, s, v) {
  const rgb = HSVToRGB(h, s, v);
  return RGBToHex(rgb.r, rgb.g, rgb.b);
}
/**
 * Convert hex color string into HSV \<0, 1\>.
 * @param hex - Hex color string.
 * @returns HSV color object.
 */
function hexToHSV(hex) {
  const rgb = hexToRGB(hex);
  if (!rgb) {
    throw new TypeError("'".concat(hex, "' is not a valid color."));
  }
  return RGBToHSV(rgb.r, rgb.g, rgb.b);
}
/**
 * Validate hex color string.
 * @param hex - Unknown string that may contain a color.
 * @returns True if the string is valid, false otherwise.
 */
function isValidHex(hex) {
  const isOk = /(^#[0-9A-F]{6}$)|(^#[0-9A-F]{3}$)/i.test(hex);
  return isOk;
}
/**
 * Validate RGB color string.
 * @param rgb - Unknown string that may contain a color.
 * @returns True if the string is valid, false otherwise.
 */
function isValidRGB(rgb) {
  return rgbRE.test(rgb);
}
/**
 * Validate RGBA color string.
 * @param rgba - Unknown string that may contain a color.
 * @returns True if the string is valid, false otherwise.
 */
function isValidRGBA(rgba) {
  return rgbaRE.test(rgba);
}
/**
 * This recursively redirects the prototype of JSON objects to the referenceObject.
 * This is used for default options.
 * @param fields - Names of properties to be bridged.
 * @param referenceObject - The original object.
 * @returns A new object inheriting from the referenceObject.
 */
function selectiveBridgeObject(fields, referenceObject) {
  if (referenceObject !== null && typeof referenceObject === "object") {
    // !!! typeof null === 'object'
    const objectTo = _Object$create(referenceObject);
    for (let i = 0; i < fields.length; i++) {
      if (Object.prototype.hasOwnProperty.call(referenceObject, fields[i])) {
        if (typeof referenceObject[fields[i]] == "object") {
          objectTo[fields[i]] = bridgeObject(referenceObject[fields[i]]);
        }
      }
    }
    return objectTo;
  } else {
    return null;
  }
}
/**
 * This recursively redirects the prototype of JSON objects to the referenceObject.
 * This is used for default options.
 * @param referenceObject - The original object.
 * @returns The Element if the referenceObject is an Element, or a new object inheriting from the referenceObject.
 */
function bridgeObject(referenceObject) {
  if (referenceObject === null || typeof referenceObject !== "object") {
    return null;
  }
  if (referenceObject instanceof Element) {
    // Avoid bridging DOM objects
    return referenceObject;
  }
  const objectTo = _Object$create(referenceObject);
  for (const i in referenceObject) {
    if (Object.prototype.hasOwnProperty.call(referenceObject, i)) {
      if (typeof referenceObject[i] == "object") {
        objectTo[i] = bridgeObject(referenceObject[i]);
      }
    }
  }
  return objectTo;
}
/**
 * This method provides a stable sort implementation, very fast for presorted data.
 * @param a - The array to be sorted (in-place).
 * @param compare - An order comparator.
 * @returns The argument a.
 */
function insertSort(a, compare) {
  for (let i = 0; i < a.length; i++) {
    const k = a[i];
    let j;
    for (j = i; j > 0 && compare(k, a[j - 1]) < 0; j--) {
      a[j] = a[j - 1];
    }
    a[j] = k;
  }
  return a;
}
/**
 * This is used to set the options of subobjects in the options object.
 *
 * A requirement of these subobjects is that they have an 'enabled' element
 * which is optional for the user but mandatory for the program.
 *
 * The added value here of the merge is that option 'enabled' is set as required.
 * @param mergeTarget - Either this.options or the options used for the groups.
 * @param options - Options.
 * @param option - Option key in the options argument.
 * @param globalOptions - Global options, passed in to determine value of option 'enabled'.
 */
function mergeOptions(mergeTarget, options, option) {
  let globalOptions = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : {};
  // Local helpers
  const isPresent = function (obj) {
    return obj !== null && obj !== undefined;
  };
  const isObject = function (obj) {
    return obj !== null && typeof obj === "object";
  };
  // https://stackoverflow.com/a/34491287/1223531
  const isEmpty = function (obj) {
    for (const x in obj) {
      if (Object.prototype.hasOwnProperty.call(obj, x)) {
        return false;
      }
    }
    return true;
  };
  // Guards
  if (!isObject(mergeTarget)) {
    throw new Error("Parameter mergeTarget must be an object");
  }
  if (!isObject(options)) {
    throw new Error("Parameter options must be an object");
  }
  if (!isPresent(option)) {
    throw new Error("Parameter option must have a value");
  }
  if (!isObject(globalOptions)) {
    throw new Error("Parameter globalOptions must be an object");
  }
  //
  // Actual merge routine, separated from main logic
  // Only a single level of options is merged. Deeper levels are ref'd. This may actually be an issue.
  //
  const doMerge = function (target, options, option) {
    if (!isObject(target[option])) {
      target[option] = {};
    }
    const src = options[option];
    const dst = target[option];
    for (const prop in src) {
      if (Object.prototype.hasOwnProperty.call(src, prop)) {
        dst[prop] = src[prop];
      }
    }
  };
  // Local initialization
  const srcOption = options[option];
  const globalPassed = isObject(globalOptions) && !isEmpty(globalOptions);
  const globalOption = globalPassed ? globalOptions[option] : undefined;
  const globalEnabled = globalOption ? globalOption.enabled : undefined;
  /////////////////////////////////////////
  // Main routine
  /////////////////////////////////////////
  if (srcOption === undefined) {
    return; // Nothing to do
  }
  if (typeof srcOption === "boolean") {
    if (!isObject(mergeTarget[option])) {
      mergeTarget[option] = {};
    }
    mergeTarget[option].enabled = srcOption;
    return;
  }
  if (srcOption === null && !isObject(mergeTarget[option])) {
    // If possible, explicit copy from globals
    if (isPresent(globalOption)) {
      mergeTarget[option] = _Object$create(globalOption);
    } else {
      return; // Nothing to do
    }
  }
  if (!isObject(srcOption)) {
    return;
  }
  //
  // Ensure that 'enabled' is properly set. It is required internally
  // Note that the value from options will always overwrite the existing value
  //
  let enabled = true; // default value
  if (srcOption.enabled !== undefined) {
    enabled = srcOption.enabled;
  } else {
    // Take from globals, if present
    if (globalEnabled !== undefined) {
      enabled = globalOption.enabled;
    }
  }
  doMerge(mergeTarget, options, option);
  mergeTarget[option].enabled = enabled;
}
/**
 * This function does a binary search for a visible item in a sorted list. If we find a visible item, the code that uses
 * this function will then iterate in both directions over this sorted list to find all visible items.
 * @param orderedItems - Items ordered by start.
 * @param comparator - -1 is lower, 0 is equal, 1 is higher.
 * @param field - Property name on an item (That is item[field]).
 * @param field2 - Second property name on an item (That is item[field][field2]).
 * @returns Index of the found item or -1 if nothing was found.
 */
function binarySearchCustom(orderedItems, comparator, field, field2) {
  const maxIterations = 10000;
  let iteration = 0;
  let low = 0;
  let high = orderedItems.length - 1;
  while (low <= high && iteration < maxIterations) {
    const middle = Math.floor((low + high) / 2);
    const item = orderedItems[middle];
    const value = field2 === undefined ? item[field] : item[field][field2];
    const searchResult = comparator(value);
    if (searchResult == 0) {
      // jihaa, found a visible item!
      return middle;
    } else if (searchResult == -1) {
      // it is too small --> increase low
      low = middle + 1;
    } else {
      // it is too big --> decrease high
      high = middle - 1;
    }
    iteration++;
  }
  return -1;
}
/**
 * This function does a binary search for a specific value in a sorted array.
 * If it does not exist but is in between of two values, we return either the
 * one before or the one after, depending on user input If it is found, we
 * return the index, else -1.
 * @param orderedItems - Sorted array.
 * @param target - The searched value.
 * @param field - Name of the property in items to be searched.
 * @param sidePreference - If the target is between two values, should the index of the before or the after be returned?
 * @param comparator - An optional comparator, returning -1, 0, 1 for \<, ===, \>.
 * @returns The index of found value or -1 if nothing was found.
 */
function binarySearchValue(orderedItems, target, field, sidePreference, comparator) {
  const maxIterations = 10000;
  let iteration = 0;
  let low = 0;
  let high = orderedItems.length - 1;
  let prevValue;
  let value;
  let nextValue;
  let middle;
  comparator = comparator != undefined ? comparator : function (a, b) {
    return a == b ? 0 : a < b ? -1 : 1;
  };
  while (low <= high && iteration < maxIterations) {
    // get a new guess
    middle = Math.floor(0.5 * (high + low));
    prevValue = orderedItems[Math.max(0, middle - 1)][field];
    value = orderedItems[middle][field];
    nextValue = orderedItems[Math.min(orderedItems.length - 1, middle + 1)][field];
    if (comparator(value, target) == 0) {
      // we found the target
      return middle;
    } else if (comparator(prevValue, target) < 0 && comparator(value, target) > 0) {
      // target is in between of the previous and the current
      return sidePreference == "before" ? Math.max(0, middle - 1) : middle;
    } else if (comparator(value, target) < 0 && comparator(nextValue, target) > 0) {
      // target is in between of the current and the next
      return sidePreference == "before" ? middle : Math.min(orderedItems.length - 1, middle + 1);
    } else {
      // didnt find the target, we need to change our boundaries.
      if (comparator(value, target) < 0) {
        // it is too small --> increase low
        low = middle + 1;
      } else {
        // it is too big --> decrease high
        high = middle - 1;
      }
    }
    iteration++;
  }
  // didnt find anything. Return -1.
  return -1;
}
/*
 * Easing Functions.
 * Only considering the t value for the range [0, 1] => [0, 1].
 *
 * Inspiration: from http://gizma.com/easing/
 * https://gist.github.com/gre/1650294
 */
const easingFunctions = {
  /**
   * Provides no easing and no acceleration.
   * @param t - Time.
   * @returns Value at time t.
   */
  linear(t) {
    return t;
  },
  /**
   * Accelerate from zero velocity.
   * @param t - Time.
   * @returns Value at time t.
   */
  easeInQuad(t) {
    return t * t;
  },
  /**
   * Decelerate to zero velocity.
   * @param t - Time.
   * @returns Value at time t.
   */
  easeOutQuad(t) {
    return t * (2 - t);
  },
  /**
   * Accelerate until halfway, then decelerate.
   * @param t - Time.
   * @returns Value at time t.
   */
  easeInOutQuad(t) {
    return t < 0.5 ? 2 * t * t : -1 + (4 - 2 * t) * t;
  },
  /**
   * Accelerate from zero velocity.
   * @param t - Time.
   * @returns Value at time t.
   */
  easeInCubic(t) {
    return t * t * t;
  },
  /**
   * Decelerate to zero velocity.
   * @param t - Time.
   * @returns Value at time t.
   */
  easeOutCubic(t) {
    return --t * t * t + 1;
  },
  /**
   * Accelerate until halfway, then decelerate.
   * @param t - Time.
   * @returns Value at time t.
   */
  easeInOutCubic(t) {
    return t < 0.5 ? 4 * t * t * t : (t - 1) * (2 * t - 2) * (2 * t - 2) + 1;
  },
  /**
   * Accelerate from zero velocity.
   * @param t - Time.
   * @returns Value at time t.
   */
  easeInQuart(t) {
    return t * t * t * t;
  },
  /**
   * Decelerate to zero velocity.
   * @param t - Time.
   * @returns Value at time t.
   */
  easeOutQuart(t) {
    return 1 - --t * t * t * t;
  },
  /**
   * Accelerate until halfway, then decelerate.
   * @param t - Time.
   * @returns Value at time t.
   */
  easeInOutQuart(t) {
    return t < 0.5 ? 8 * t * t * t * t : 1 - 8 * --t * t * t * t;
  },
  /**
   * Accelerate from zero velocity.
   * @param t - Time.
   * @returns Value at time t.
   */
  easeInQuint(t) {
    return t * t * t * t * t;
  },
  /**
   * Decelerate to zero velocity.
   * @param t - Time.
   * @returns Value at time t.
   */
  easeOutQuint(t) {
    return 1 + --t * t * t * t * t;
  },
  /**
   * Accelerate until halfway, then decelerate.
   * @param t - Time.
   * @returns Value at time t.
   */
  easeInOutQuint(t) {
    return t < 0.5 ? 16 * t * t * t * t * t : 1 + 16 * --t * t * t * t * t;
  }
};
/**
 * Experimentaly compute the width of the scrollbar for this browser.
 * @returns The width in pixels.
 */
function getScrollBarWidth() {
  const inner = document.createElement("p");
  inner.style.width = "100%";
  inner.style.height = "200px";
  const outer = document.createElement("div");
  outer.style.position = "absolute";
  outer.style.top = "0px";
  outer.style.left = "0px";
  outer.style.visibility = "hidden";
  outer.style.width = "200px";
  outer.style.height = "150px";
  outer.style.overflow = "hidden";
  outer.appendChild(inner);
  document.body.appendChild(outer);
  const w1 = inner.offsetWidth;
  outer.style.overflow = "scroll";
  let w2 = inner.offsetWidth;
  if (w1 == w2) {
    w2 = outer.clientWidth;
  }
  document.body.removeChild(outer);
  return w1 - w2;
}
// @TODO: This doesn't work properly.
// It works only for single property objects,
// otherwise it combines all of the types in a union.
// export function topMost<K1 extends string, V1> (
//   pile: Record<K1, undefined | V1>[],
//   accessors: K1 | [K1]
// ): undefined | V1
// export function topMost<K1 extends string, K2 extends string, V1, V2> (
//   pile: Record<K1, undefined | V1 | Record<K2, undefined | V2>>[],
//   accessors: [K1, K2]
// ): undefined | V1 | V2
// export function topMost<K1 extends string, K2 extends string, K3 extends string, V1, V2, V3> (
//   pile: Record<K1, undefined | V1 | Record<K2, undefined | V2 | Record<K3, undefined | V3>>>[],
//   accessors: [K1, K2, K3]
// ): undefined | V1 | V2 | V3
/**
 * Get the top most property value from a pile of objects.
 * @param pile - Array of objects, no required format.
 * @param accessors - Array of property names.
 * For example `object['foo']['bar']` → `['foo', 'bar']`.
 * @returns Value of the property with given accessors path from the first pile item where it's not undefined.
 */
function topMost(pile, accessors) {
  let candidate;
  if (!_Array$isArray(accessors)) {
    accessors = [accessors];
  }
  for (const member of pile) {
    if (member) {
      candidate = member[accessors[0]];
      for (let i = 1; i < accessors.length; i++) {
        if (candidate) {
          candidate = candidate[accessors[i]];
        }
      }
      if (typeof candidate !== "undefined") {
        break;
      }
    }
  }
  return candidate;
}
const htmlColors$1 = {
  black: "#000000",
  navy: "#000080",
  darkblue: "#00008B",
  mediumblue: "#0000CD",
  blue: "#0000FF",
  darkgreen: "#006400",
  green: "#008000",
  teal: "#008080",
  darkcyan: "#008B8B",
  deepskyblue: "#00BFFF",
  darkturquoise: "#00CED1",
  mediumspringgreen: "#00FA9A",
  lime: "#00FF00",
  springgreen: "#00FF7F",
  aqua: "#00FFFF",
  cyan: "#00FFFF",
  midnightblue: "#191970",
  dodgerblue: "#1E90FF",
  lightseagreen: "#20B2AA",
  forestgreen: "#228B22",
  seagreen: "#2E8B57",
  darkslategray: "#2F4F4F",
  limegreen: "#32CD32",
  mediumseagreen: "#3CB371",
  turquoise: "#40E0D0",
  royalblue: "#4169E1",
  steelblue: "#4682B4",
  darkslateblue: "#483D8B",
  mediumturquoise: "#48D1CC",
  indigo: "#4B0082",
  darkolivegreen: "#556B2F",
  cadetblue: "#5F9EA0",
  cornflowerblue: "#6495ED",
  mediumaquamarine: "#66CDAA",
  dimgray: "#696969",
  slateblue: "#6A5ACD",
  olivedrab: "#6B8E23",
  slategray: "#708090",
  lightslategray: "#778899",
  mediumslateblue: "#7B68EE",
  lawngreen: "#7CFC00",
  chartreuse: "#7FFF00",
  aquamarine: "#7FFFD4",
  maroon: "#800000",
  purple: "#800080",
  olive: "#808000",
  gray: "#808080",
  skyblue: "#87CEEB",
  lightskyblue: "#87CEFA",
  blueviolet: "#8A2BE2",
  darkred: "#8B0000",
  darkmagenta: "#8B008B",
  saddlebrown: "#8B4513",
  darkseagreen: "#8FBC8F",
  lightgreen: "#90EE90",
  mediumpurple: "#9370D8",
  darkviolet: "#9400D3",
  palegreen: "#98FB98",
  darkorchid: "#9932CC",
  yellowgreen: "#9ACD32",
  sienna: "#A0522D",
  brown: "#A52A2A",
  darkgray: "#A9A9A9",
  lightblue: "#ADD8E6",
  greenyellow: "#ADFF2F",
  paleturquoise: "#AFEEEE",
  lightsteelblue: "#B0C4DE",
  powderblue: "#B0E0E6",
  firebrick: "#B22222",
  darkgoldenrod: "#B8860B",
  mediumorchid: "#BA55D3",
  rosybrown: "#BC8F8F",
  darkkhaki: "#BDB76B",
  silver: "#C0C0C0",
  mediumvioletred: "#C71585",
  indianred: "#CD5C5C",
  peru: "#CD853F",
  chocolate: "#D2691E",
  tan: "#D2B48C",
  lightgrey: "#D3D3D3",
  palevioletred: "#D87093",
  thistle: "#D8BFD8",
  orchid: "#DA70D6",
  goldenrod: "#DAA520",
  crimson: "#DC143C",
  gainsboro: "#DCDCDC",
  plum: "#DDA0DD",
  burlywood: "#DEB887",
  lightcyan: "#E0FFFF",
  lavender: "#E6E6FA",
  darksalmon: "#E9967A",
  violet: "#EE82EE",
  palegoldenrod: "#EEE8AA",
  lightcoral: "#F08080",
  khaki: "#F0E68C",
  aliceblue: "#F0F8FF",
  honeydew: "#F0FFF0",
  azure: "#F0FFFF",
  sandybrown: "#F4A460",
  wheat: "#F5DEB3",
  beige: "#F5F5DC",
  whitesmoke: "#F5F5F5",
  mintcream: "#F5FFFA",
  ghostwhite: "#F8F8FF",
  salmon: "#FA8072",
  antiquewhite: "#FAEBD7",
  linen: "#FAF0E6",
  lightgoldenrodyellow: "#FAFAD2",
  oldlace: "#FDF5E6",
  red: "#FF0000",
  fuchsia: "#FF00FF",
  magenta: "#FF00FF",
  deeppink: "#FF1493",
  orangered: "#FF4500",
  tomato: "#FF6347",
  hotpink: "#FF69B4",
  coral: "#FF7F50",
  darkorange: "#FF8C00",
  lightsalmon: "#FFA07A",
  orange: "#FFA500",
  lightpink: "#FFB6C1",
  pink: "#FFC0CB",
  gold: "#FFD700",
  peachpuff: "#FFDAB9",
  navajowhite: "#FFDEAD",
  moccasin: "#FFE4B5",
  bisque: "#FFE4C4",
  mistyrose: "#FFE4E1",
  blanchedalmond: "#FFEBCD",
  papayawhip: "#FFEFD5",
  lavenderblush: "#FFF0F5",
  seashell: "#FFF5EE",
  cornsilk: "#FFF8DC",
  lemonchiffon: "#FFFACD",
  floralwhite: "#FFFAF0",
  snow: "#FFFAFA",
  yellow: "#FFFF00",
  lightyellow: "#FFFFE0",
  ivory: "#FFFFF0",
  white: "#FFFFFF"
};

/**
 * @param {number} [pixelRatio=1]
 */
let ColorPicker$1 = class ColorPicker {
  /**
   * @param {number} [pixelRatio]
   */
  constructor() {
    let pixelRatio = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : 1;
    this.pixelRatio = pixelRatio;
    this.generated = false;
    this.centerCoordinates = {
      x: 289 / 2,
      y: 289 / 2
    };
    this.r = 289 * 0.49;
    this.color = {
      r: 255,
      g: 255,
      b: 255,
      a: 1.0
    };
    this.hueCircle = undefined;
    this.initialColor = {
      r: 255,
      g: 255,
      b: 255,
      a: 1.0
    };
    this.previousColor = undefined;
    this.applied = false;

    // bound by
    this.updateCallback = () => {};
    this.closeCallback = () => {};

    // create all DOM elements
    this._create();
  }

  /**
   * this inserts the colorPicker into a div from the DOM
   * @param {Element} container
   */
  insertTo(container) {
    if (this.hammer !== undefined) {
      this.hammer.destroy();
      this.hammer = undefined;
    }
    this.container = container;
    this.container.appendChild(this.frame);
    this._bindHammer();
    this._setSize();
  }

  /**
   * the callback is executed on apply and save. Bind it to the application
   * @param {Function} callback
   */
  setUpdateCallback(callback) {
    if (typeof callback === "function") {
      this.updateCallback = callback;
    } else {
      throw new Error("Function attempted to set as colorPicker update callback is not a function.");
    }
  }

  /**
   * the callback is executed on apply and save. Bind it to the application
   * @param {Function} callback
   */
  setCloseCallback(callback) {
    if (typeof callback === "function") {
      this.closeCallback = callback;
    } else {
      throw new Error("Function attempted to set as colorPicker closing callback is not a function.");
    }
  }

  /**
   *
   * @param {string} color
   * @returns {string}
   * @private
   */
  _isColorString(color) {
    if (typeof color === "string") {
      return htmlColors$1[color];
    }
  }

  /**
   * Set the color of the colorPicker
   * Supported formats:
   * 'red'                   --> HTML color string
   * '#ffffff'               --> hex string
   * 'rgb(255,255,255)'      --> rgb string
   * 'rgba(255,255,255,1.0)' --> rgba string
   * {r:255,g:255,b:255}     --> rgb object
   * {r:255,g:255,b:255,a:1.0} --> rgba object
   * @param {string | object} color
   * @param {boolean} [setInitial]
   */
  setColor(color) {
    let setInitial = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : true;
    if (color === "none") {
      return;
    }
    let rgba;

    // if a html color shorthand is used, convert to hex
    const htmlColor = this._isColorString(color);
    if (htmlColor !== undefined) {
      color = htmlColor;
    }

    // check format
    if (isString(color) === true) {
      if (isValidRGB(color) === true) {
        const rgbaArray = color.substr(4).substr(0, color.length - 5).split(",");
        rgba = {
          r: rgbaArray[0],
          g: rgbaArray[1],
          b: rgbaArray[2],
          a: 1.0
        };
      } else if (isValidRGBA(color) === true) {
        const rgbaArray = color.substr(5).substr(0, color.length - 6).split(",");
        rgba = {
          r: rgbaArray[0],
          g: rgbaArray[1],
          b: rgbaArray[2],
          a: rgbaArray[3]
        };
      } else if (isValidHex(color) === true) {
        const rgbObj = hexToRGB(color);
        rgba = {
          r: rgbObj.r,
          g: rgbObj.g,
          b: rgbObj.b,
          a: 1.0
        };
      }
    } else {
      if (color instanceof Object) {
        if (color.r !== undefined && color.g !== undefined && color.b !== undefined) {
          const alpha = color.a !== undefined ? color.a : "1.0";
          rgba = {
            r: color.r,
            g: color.g,
            b: color.b,
            a: alpha
          };
        }
      }
    }

    // set color
    if (rgba === undefined) {
      throw new Error("Unknown color passed to the colorPicker. Supported are strings: rgb, hex, rgba. Object: rgb ({r:r,g:g,b:b,[a:a]}). Supplied: " + _JSON$stringify(color));
    } else {
      this._setColor(rgba, setInitial);
    }
  }

  /**
   * this shows the color picker.
   * The hue circle is constructed once and stored.
   */
  show() {
    if (this.closeCallback !== undefined) {
      this.closeCallback();
      this.closeCallback = undefined;
    }
    this.applied = false;
    this.frame.style.display = "block";
    this._generateHueCircle();
  }

  // ------------------------------------------ PRIVATE ----------------------------- //

  /**
   * Hide the picker. Is called by the cancel button.
   * Optional boolean to store the previous color for easy access later on.
   * @param {boolean} [storePrevious]
   * @private
   */
  _hide() {
    let storePrevious = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : true;
    // store the previous color for next time;
    if (storePrevious === true) {
      this.previousColor = _Object$assign({}, this.color);
    }
    if (this.applied === true) {
      this.updateCallback(this.initialColor);
    }
    this.frame.style.display = "none";

    // call the closing callback, restoring the onclick method.
    // this is in a setTimeout because it will trigger the show again before the click is done.
    _setTimeout(() => {
      if (this.closeCallback !== undefined) {
        this.closeCallback();
        this.closeCallback = undefined;
      }
    }, 0);
  }

  /**
   * bound to the save button. Saves and hides.
   * @private
   */
  _save() {
    this.updateCallback(this.color);
    this.applied = false;
    this._hide();
  }

  /**
   * Bound to apply button. Saves but does not close. Is undone by the cancel button.
   * @private
   */
  _apply() {
    this.applied = true;
    this.updateCallback(this.color);
    this._updatePicker(this.color);
  }

  /**
   * load the color from the previous session.
   * @private
   */
  _loadLast() {
    if (this.previousColor !== undefined) {
      this.setColor(this.previousColor, false);
    } else {
      alert("There is no last color to load...");
    }
  }

  /**
   * set the color, place the picker
   * @param {object} rgba
   * @param {boolean} [setInitial]
   * @private
   */
  _setColor(rgba) {
    let setInitial = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : true;
    // store the initial color
    if (setInitial === true) {
      this.initialColor = _Object$assign({}, rgba);
    }
    this.color = rgba;
    const hsv = RGBToHSV(rgba.r, rgba.g, rgba.b);
    const angleConvert = 2 * Math.PI;
    const radius = this.r * hsv.s;
    const x = this.centerCoordinates.x + radius * Math.sin(angleConvert * hsv.h);
    const y = this.centerCoordinates.y + radius * Math.cos(angleConvert * hsv.h);
    this.colorPickerSelector.style.left = x - 0.5 * this.colorPickerSelector.clientWidth + "px";
    this.colorPickerSelector.style.top = y - 0.5 * this.colorPickerSelector.clientHeight + "px";
    this._updatePicker(rgba);
  }

  /**
   * bound to opacity control
   * @param {number} value
   * @private
   */
  _setOpacity(value) {
    this.color.a = value / 100;
    this._updatePicker(this.color);
  }

  /**
   * bound to brightness control
   * @param {number} value
   * @private
   */
  _setBrightness(value) {
    const hsv = RGBToHSV(this.color.r, this.color.g, this.color.b);
    hsv.v = value / 100;
    const rgba = HSVToRGB(hsv.h, hsv.s, hsv.v);
    rgba["a"] = this.color.a;
    this.color = rgba;
    this._updatePicker();
  }

  /**
   * update the color picker. A black circle overlays the hue circle to mimic the brightness decreasing.
   * @param {object} rgba
   * @private
   */
  _updatePicker() {
    let rgba = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : this.color;
    const hsv = RGBToHSV(rgba.r, rgba.g, rgba.b);
    const ctx = this.colorPickerCanvas.getContext("2d");
    if (this.pixelRation === undefined) {
      this.pixelRatio = (window.devicePixelRatio || 1) / (ctx.webkitBackingStorePixelRatio || ctx.mozBackingStorePixelRatio || ctx.msBackingStorePixelRatio || ctx.oBackingStorePixelRatio || ctx.backingStorePixelRatio || 1);
    }
    ctx.setTransform(this.pixelRatio, 0, 0, this.pixelRatio, 0, 0);

    // clear the canvas
    const w = this.colorPickerCanvas.clientWidth;
    const h = this.colorPickerCanvas.clientHeight;
    ctx.clearRect(0, 0, w, h);
    ctx.putImageData(this.hueCircle, 0, 0);
    ctx.fillStyle = "rgba(0,0,0," + (1 - hsv.v) + ")";
    ctx.circle(this.centerCoordinates.x, this.centerCoordinates.y, this.r);
    _fillInstanceProperty(ctx).call(ctx);
    this.brightnessRange.value = 100 * hsv.v;
    this.opacityRange.value = 100 * rgba.a;
    this.initialColorDiv.style.backgroundColor = "rgba(" + this.initialColor.r + "," + this.initialColor.g + "," + this.initialColor.b + "," + this.initialColor.a + ")";
    this.newColorDiv.style.backgroundColor = "rgba(" + this.color.r + "," + this.color.g + "," + this.color.b + "," + this.color.a + ")";
  }

  /**
   * used by create to set the size of the canvas.
   * @private
   */
  _setSize() {
    this.colorPickerCanvas.style.width = "100%";
    this.colorPickerCanvas.style.height = "100%";
    this.colorPickerCanvas.width = 289 * this.pixelRatio;
    this.colorPickerCanvas.height = 289 * this.pixelRatio;
  }

  /**
   * create all dom elements
   * TODO: cleanup, lots of similar dom elements
   * @private
   */
  _create() {
    var _context7, _context8, _context9, _context0;
    this.frame = document.createElement("div");
    this.frame.className = "vis-color-picker";
    this.colorPickerDiv = document.createElement("div");
    this.colorPickerSelector = document.createElement("div");
    this.colorPickerSelector.className = "vis-selector";
    this.colorPickerDiv.appendChild(this.colorPickerSelector);
    this.colorPickerCanvas = document.createElement("canvas");
    this.colorPickerDiv.appendChild(this.colorPickerCanvas);
    if (!this.colorPickerCanvas.getContext) {
      const noCanvas = document.createElement("DIV");
      noCanvas.style.color = "red";
      noCanvas.style.fontWeight = "bold";
      noCanvas.style.padding = "10px";
      noCanvas.innerText = "Error: your browser does not support HTML canvas";
      this.colorPickerCanvas.appendChild(noCanvas);
    } else {
      const ctx = this.colorPickerCanvas.getContext("2d");
      this.pixelRatio = (window.devicePixelRatio || 1) / (ctx.webkitBackingStorePixelRatio || ctx.mozBackingStorePixelRatio || ctx.msBackingStorePixelRatio || ctx.oBackingStorePixelRatio || ctx.backingStorePixelRatio || 1);
      this.colorPickerCanvas.getContext("2d").setTransform(this.pixelRatio, 0, 0, this.pixelRatio, 0, 0);
    }
    this.colorPickerDiv.className = "vis-color";
    this.opacityDiv = document.createElement("div");
    this.opacityDiv.className = "vis-opacity";
    this.brightnessDiv = document.createElement("div");
    this.brightnessDiv.className = "vis-brightness";
    this.arrowDiv = document.createElement("div");
    this.arrowDiv.className = "vis-arrow";
    this.opacityRange = document.createElement("input");
    try {
      this.opacityRange.type = "range"; // Not supported on IE9
      this.opacityRange.min = "0";
      this.opacityRange.max = "100";
    } catch (err) {
      // TODO: Add some error handling.
    }
    this.opacityRange.value = "100";
    this.opacityRange.className = "vis-range";
    this.brightnessRange = document.createElement("input");
    try {
      this.brightnessRange.type = "range"; // Not supported on IE9
      this.brightnessRange.min = "0";
      this.brightnessRange.max = "100";
    } catch (err) {
      // TODO: Add some error handling.
    }
    this.brightnessRange.value = "100";
    this.brightnessRange.className = "vis-range";
    this.opacityDiv.appendChild(this.opacityRange);
    this.brightnessDiv.appendChild(this.brightnessRange);
    const me = this;
    this.opacityRange.onchange = function () {
      me._setOpacity(this.value);
    };
    this.opacityRange.oninput = function () {
      me._setOpacity(this.value);
    };
    this.brightnessRange.onchange = function () {
      me._setBrightness(this.value);
    };
    this.brightnessRange.oninput = function () {
      me._setBrightness(this.value);
    };
    this.brightnessLabel = document.createElement("div");
    this.brightnessLabel.className = "vis-label vis-brightness";
    this.brightnessLabel.innerText = "brightness:";
    this.opacityLabel = document.createElement("div");
    this.opacityLabel.className = "vis-label vis-opacity";
    this.opacityLabel.innerText = "opacity:";
    this.newColorDiv = document.createElement("div");
    this.newColorDiv.className = "vis-new-color";
    this.newColorDiv.innerText = "new";
    this.initialColorDiv = document.createElement("div");
    this.initialColorDiv.className = "vis-initial-color";
    this.initialColorDiv.innerText = "initial";
    this.cancelButton = document.createElement("div");
    this.cancelButton.className = "vis-button vis-cancel";
    this.cancelButton.innerText = "cancel";
    this.cancelButton.onclick = _bindInstanceProperty(_context7 = this._hide).call(_context7, this, false);
    this.applyButton = document.createElement("div");
    this.applyButton.className = "vis-button vis-apply";
    this.applyButton.innerText = "apply";
    this.applyButton.onclick = _bindInstanceProperty(_context8 = this._apply).call(_context8, this);
    this.saveButton = document.createElement("div");
    this.saveButton.className = "vis-button vis-save";
    this.saveButton.innerText = "save";
    this.saveButton.onclick = _bindInstanceProperty(_context9 = this._save).call(_context9, this);
    this.loadButton = document.createElement("div");
    this.loadButton.className = "vis-button vis-load";
    this.loadButton.innerText = "load last";
    this.loadButton.onclick = _bindInstanceProperty(_context0 = this._loadLast).call(_context0, this);
    this.frame.appendChild(this.colorPickerDiv);
    this.frame.appendChild(this.arrowDiv);
    this.frame.appendChild(this.brightnessLabel);
    this.frame.appendChild(this.brightnessDiv);
    this.frame.appendChild(this.opacityLabel);
    this.frame.appendChild(this.opacityDiv);
    this.frame.appendChild(this.newColorDiv);
    this.frame.appendChild(this.initialColorDiv);
    this.frame.appendChild(this.cancelButton);
    this.frame.appendChild(this.applyButton);
    this.frame.appendChild(this.saveButton);
    this.frame.appendChild(this.loadButton);
  }

  /**
   * bind hammer to the color picker
   * @private
   */
  _bindHammer() {
    this.drag = {};
    this.pinch = {};
    this.hammer = new Hammer$1(this.colorPickerCanvas);
    this.hammer.get("pinch").set({
      enable: true
    });
    this.hammer.on("hammer.input", event => {
      if (event.isFirst) {
        this._moveSelector(event);
      }
    });
    this.hammer.on("tap", event => {
      this._moveSelector(event);
    });
    this.hammer.on("panstart", event => {
      this._moveSelector(event);
    });
    this.hammer.on("panmove", event => {
      this._moveSelector(event);
    });
    this.hammer.on("panend", event => {
      this._moveSelector(event);
    });
  }

  /**
   * generate the hue circle. This is relatively heavy (200ms) and is done only once on the first time it is shown.
   * @private
   */
  _generateHueCircle() {
    if (this.generated === false) {
      const ctx = this.colorPickerCanvas.getContext("2d");
      if (this.pixelRation === undefined) {
        this.pixelRatio = (window.devicePixelRatio || 1) / (ctx.webkitBackingStorePixelRatio || ctx.mozBackingStorePixelRatio || ctx.msBackingStorePixelRatio || ctx.oBackingStorePixelRatio || ctx.backingStorePixelRatio || 1);
      }
      ctx.setTransform(this.pixelRatio, 0, 0, this.pixelRatio, 0, 0);

      // clear the canvas
      const w = this.colorPickerCanvas.clientWidth;
      const h = this.colorPickerCanvas.clientHeight;
      ctx.clearRect(0, 0, w, h);

      // draw hue circle
      let x, y, hue, sat;
      this.centerCoordinates = {
        x: w * 0.5,
        y: h * 0.5
      };
      this.r = 0.49 * w;
      const angleConvert = 2 * Math.PI / 360;
      const hfac = 1 / 360;
      const sfac = 1 / this.r;
      let rgb;
      for (hue = 0; hue < 360; hue++) {
        for (sat = 0; sat < this.r; sat++) {
          x = this.centerCoordinates.x + sat * Math.sin(angleConvert * hue);
          y = this.centerCoordinates.y + sat * Math.cos(angleConvert * hue);
          rgb = HSVToRGB(hue * hfac, sat * sfac, 1);
          ctx.fillStyle = "rgb(" + rgb.r + "," + rgb.g + "," + rgb.b + ")";
          ctx.fillRect(x - 0.5, y - 0.5, 2, 2);
        }
      }
      ctx.strokeStyle = "rgba(0,0,0,1)";
      ctx.circle(this.centerCoordinates.x, this.centerCoordinates.y, this.r);
      ctx.stroke();
      this.hueCircle = ctx.getImageData(0, 0, w, h);
    }
    this.generated = true;
  }

  /**
   * move the selector. This is called by hammer functions.
   * @param {Event}  event   The event
   * @private
   */
  _moveSelector(event) {
    const rect = this.colorPickerDiv.getBoundingClientRect();
    const left = event.center.x - rect.left;
    const top = event.center.y - rect.top;
    const centerY = 0.5 * this.colorPickerDiv.clientHeight;
    const centerX = 0.5 * this.colorPickerDiv.clientWidth;
    const x = left - centerX;
    const y = top - centerY;
    const angle = Math.atan2(x, y);
    const radius = 0.98 * Math.min(Math.sqrt(x * x + y * y), centerX);
    const newTop = Math.cos(angle) * radius + centerY;
    const newLeft = Math.sin(angle) * radius + centerX;
    this.colorPickerSelector.style.top = newTop - 0.5 * this.colorPickerSelector.clientHeight + "px";
    this.colorPickerSelector.style.left = newLeft - 0.5 * this.colorPickerSelector.clientWidth + "px";

    // set color
    let h = angle / (2 * Math.PI);
    h = h < 0 ? h + 1 : h;
    const s = radius / this.r;
    const hsv = RGBToHSV(this.color.r, this.color.g, this.color.b);
    hsv.h = h;
    hsv.s = s;
    const rgba = HSVToRGB(hsv.h, hsv.s, hsv.v);
    rgba["a"] = this.color.a;
    this.color = rgba;

    // update previews
    this.initialColorDiv.style.backgroundColor = "rgba(" + this.initialColor.r + "," + this.initialColor.g + "," + this.initialColor.b + "," + this.initialColor.a + ")";
    this.newColorDiv.style.backgroundColor = "rgba(" + this.color.r + "," + this.color.g + "," + this.color.b + "," + this.color.a + ")";
  }
};

/**
 * Wrap given text (last argument) in HTML elements (all preceding arguments).
 * @param {...any} rest - List of tag names followed by inner text.
 * @returns An element or a text node.
 */
function wrapInTag() {
  for (var _len5 = arguments.length, rest = new Array(_len5), _key5 = 0; _key5 < _len5; _key5++) {
    rest[_key5] = arguments[_key5];
  }
  if (rest.length < 1) {
    throw new TypeError("Invalid arguments.");
  } else if (rest.length === 1) {
    return document.createTextNode(rest[0]);
  } else {
    const element = document.createElement(rest[0]);
    element.appendChild(wrapInTag(..._sliceInstanceProperty(rest).call(rest, 1)));
    return element;
  }
}

/**
 * The way this works is for all properties of this.possible options, you can supply the property name in any form to list the options.
 * Boolean options are recognised as Boolean
 * Number options should be written as array: [default value, min value, max value, stepsize]
 * Colors should be written as array: ['color', '#ffffff']
 * Strings with should be written as array: [option1, option2, option3, ..]
 *
 * The options are matched with their counterparts in each of the modules and the values used in the configuration are
 */
let Configurator$1 = class Configurator {
  /**
   * @param {object} parentModule        | the location where parentModule.setOptions() can be called
   * @param {object} defaultContainer    | the default container of the module
   * @param {object} configureOptions    | the fully configured and predefined options set found in allOptions.js
   * @param {number} pixelRatio          | canvas pixel ratio
   * @param {Function} hideOption        | custom logic to dynamically hide options
   */
  constructor(parentModule, defaultContainer, configureOptions) {
    let pixelRatio = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : 1;
    let hideOption = arguments.length > 4 && arguments[4] !== undefined ? arguments[4] : () => false;
    this.parent = parentModule;
    this.changedOptions = [];
    this.container = defaultContainer;
    this.allowCreation = false;
    this.hideOption = hideOption;
    this.options = {};
    this.initialized = false;
    this.popupCounter = 0;
    this.defaultOptions = {
      enabled: false,
      filter: true,
      container: undefined,
      showButton: true
    };
    _Object$assign(this.options, this.defaultOptions);
    this.configureOptions = configureOptions;
    this.moduleOptions = {};
    this.domElements = [];
    this.popupDiv = {};
    this.popupLimit = 5;
    this.popupHistory = {};
    this.colorPicker = new ColorPicker$1(pixelRatio);
    this.wrapper = undefined;
  }

  /**
   * refresh all options.
   * Because all modules parse their options by themselves, we just use their options. We copy them here.
   * @param {object} options
   */
  setOptions(options) {
    if (options !== undefined) {
      // reset the popup history because the indices may have been changed.
      this.popupHistory = {};
      this._removePopup();
      let enabled = true;
      if (typeof options === "string") {
        this.options.filter = options;
      } else if (_Array$isArray(options)) {
        this.options.filter = options.join();
      } else if (typeof options === "object") {
        if (options == null) {
          throw new TypeError("options cannot be null");
        }
        if (options.container !== undefined) {
          this.options.container = options.container;
        }
        if (_filterInstanceProperty(options) !== undefined) {
          this.options.filter = _filterInstanceProperty(options);
        }
        if (options.showButton !== undefined) {
          this.options.showButton = options.showButton;
        }
        if (options.enabled !== undefined) {
          enabled = options.enabled;
        }
      } else if (typeof options === "boolean") {
        this.options.filter = true;
        enabled = options;
      } else if (typeof options === "function") {
        this.options.filter = options;
        enabled = true;
      }
      if (_filterInstanceProperty(this.options) === false) {
        enabled = false;
      }
      this.options.enabled = enabled;
    }
    this._clean();
  }

  /**
   *
   * @param {object} moduleOptions
   */
  setModuleOptions(moduleOptions) {
    this.moduleOptions = moduleOptions;
    if (this.options.enabled === true) {
      this._clean();
      if (this.options.container !== undefined) {
        this.container = this.options.container;
      }
      this._create();
    }
  }

  /**
   * Create all DOM elements
   * @private
   */
  _create() {
    this._clean();
    this.changedOptions = [];
    const filter = _filterInstanceProperty(this.options);
    let counter = 0;
    let show = false;
    for (const option in this.configureOptions) {
      if (Object.prototype.hasOwnProperty.call(this.configureOptions, option)) {
        this.allowCreation = false;
        show = false;
        if (typeof filter === "function") {
          show = filter(option, []);
          show = show || this._handleObject(this.configureOptions[option], [option], true);
        } else if (filter === true || _indexOfInstanceProperty(filter).call(filter, option) !== -1) {
          show = true;
        }
        if (show !== false) {
          this.allowCreation = true;

          // linebreak between categories
          if (counter > 0) {
            this._makeItem([]);
          }
          // a header for the category
          this._makeHeader(option);

          // get the sub options
          this._handleObject(this.configureOptions[option], [option]);
        }
        counter++;
      }
    }
    this._makeButton();
    this._push();
    //~ this.colorPicker.insertTo(this.container);
  }

  /**
   * draw all DOM elements on the screen
   * @private
   */
  _push() {
    this.wrapper = document.createElement("div");
    this.wrapper.className = "vis-configuration-wrapper";
    this.container.appendChild(this.wrapper);
    for (let i = 0; i < this.domElements.length; i++) {
      this.wrapper.appendChild(this.domElements[i]);
    }
    this._showPopupIfNeeded();
  }

  /**
   * delete all DOM elements
   * @private
   */
  _clean() {
    for (let i = 0; i < this.domElements.length; i++) {
      this.wrapper.removeChild(this.domElements[i]);
    }
    if (this.wrapper !== undefined) {
      this.container.removeChild(this.wrapper);
      this.wrapper = undefined;
    }
    this.domElements = [];
    this._removePopup();
  }

  /**
   * get the value from the actualOptions if it exists
   * @param {Array} path    | where to look for the actual option
   * @returns {*}
   * @private
   */
  _getValue(path) {
    let base = this.moduleOptions;
    for (let i = 0; i < path.length; i++) {
      if (base[path[i]] !== undefined) {
        base = base[path[i]];
      } else {
        base = undefined;
        break;
      }
    }
    return base;
  }

  /**
   * all option elements are wrapped in an item
   * @param {Array} path    | where to look for the actual option
   * @param {Array.<Element>} domElements
   * @returns {number}
   * @private
   */
  _makeItem(path) {
    if (this.allowCreation === true) {
      const item = document.createElement("div");
      item.className = "vis-configuration vis-config-item vis-config-s" + path.length;
      for (var _len6 = arguments.length, domElements = new Array(_len6 > 1 ? _len6 - 1 : 0), _key6 = 1; _key6 < _len6; _key6++) {
        domElements[_key6 - 1] = arguments[_key6];
      }
      _forEachInstanceProperty(domElements).call(domElements, element => {
        item.appendChild(element);
      });
      this.domElements.push(item);
      return this.domElements.length;
    }
    return 0;
  }

  /**
   * header for major subjects
   * @param {string} name
   * @private
   */
  _makeHeader(name) {
    const div = document.createElement("div");
    div.className = "vis-configuration vis-config-header";
    div.innerText = name;
    this._makeItem([], div);
  }

  /**
   * make a label, if it is an object label, it gets different styling.
   * @param {string} name
   * @param {Array} path    | where to look for the actual option
   * @param {string} objectLabel
   * @returns {HTMLElement}
   * @private
   */
  _makeLabel(name, path) {
    let objectLabel = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : false;
    const div = document.createElement("div");
    div.className = "vis-configuration vis-config-label vis-config-s" + path.length;
    if (objectLabel === true) {
      while (div.firstChild) {
        div.removeChild(div.firstChild);
      }
      div.appendChild(wrapInTag("i", "b", name));
    } else {
      div.innerText = name + ":";
    }
    return div;
  }

  /**
   * make a dropdown list for multiple possible string optoins
   * @param {Array.<number>} arr
   * @param {number} value
   * @param {Array} path    | where to look for the actual option
   * @private
   */
  _makeDropdown(arr, value, path) {
    const select = document.createElement("select");
    select.className = "vis-configuration vis-config-select";
    let selectedValue = 0;
    if (value !== undefined) {
      if (_indexOfInstanceProperty(arr).call(arr, value) !== -1) {
        selectedValue = _indexOfInstanceProperty(arr).call(arr, value);
      }
    }
    for (let i = 0; i < arr.length; i++) {
      const option = document.createElement("option");
      option.value = arr[i];
      if (i === selectedValue) {
        option.selected = "selected";
      }
      option.innerText = arr[i];
      select.appendChild(option);
    }
    const me = this;
    select.onchange = function () {
      me._update(this.value, path);
    };
    const label = this._makeLabel(path[path.length - 1], path);
    this._makeItem(path, label, select);
  }

  /**
   * make a range object for numeric options
   * @param {Array.<number>} arr
   * @param {number} value
   * @param {Array} path    | where to look for the actual option
   * @private
   */
  _makeRange(arr, value, path) {
    const defaultValue = arr[0];
    const min = arr[1];
    const max = arr[2];
    const step = arr[3];
    const range = document.createElement("input");
    range.className = "vis-configuration vis-config-range";
    try {
      range.type = "range"; // not supported on IE9
      range.min = min;
      range.max = max;
    } catch (err) {
      // TODO: Add some error handling.
    }
    range.step = step;

    // set up the popup settings in case they are needed.
    let popupString = "";
    let popupValue = 0;
    if (value !== undefined) {
      const factor = 1.2;
      if (value < 0 && value * factor < min) {
        range.min = Math.ceil(value * factor);
        popupValue = range.min;
        popupString = "range increased";
      } else if (value / factor < min) {
        range.min = Math.ceil(value / factor);
        popupValue = range.min;
        popupString = "range increased";
      }
      if (value * factor > max && max !== 1) {
        range.max = Math.ceil(value * factor);
        popupValue = range.max;
        popupString = "range increased";
      }
      range.value = value;
    } else {
      range.value = defaultValue;
    }
    const input = document.createElement("input");
    input.className = "vis-configuration vis-config-rangeinput";
    input.value = range.value;
    const me = this;
    range.onchange = function () {
      input.value = this.value;
      me._update(Number(this.value), path);
    };
    range.oninput = function () {
      input.value = this.value;
    };
    const label = this._makeLabel(path[path.length - 1], path);
    const itemIndex = this._makeItem(path, label, range, input);

    // if a popup is needed AND it has not been shown for this value, show it.
    if (popupString !== "" && this.popupHistory[itemIndex] !== popupValue) {
      this.popupHistory[itemIndex] = popupValue;
      this._setupPopup(popupString, itemIndex);
    }
  }

  /**
   * make a button object
   * @private
   */
  _makeButton() {
    if (this.options.showButton === true) {
      const generateButton = document.createElement("div");
      generateButton.className = "vis-configuration vis-config-button";
      generateButton.innerText = "generate options";
      generateButton.onclick = () => {
        this._printOptions();
      };
      generateButton.onmouseover = () => {
        generateButton.className = "vis-configuration vis-config-button hover";
      };
      generateButton.onmouseout = () => {
        generateButton.className = "vis-configuration vis-config-button";
      };
      this.optionsContainer = document.createElement("div");
      this.optionsContainer.className = "vis-configuration vis-config-option-container";
      this.domElements.push(this.optionsContainer);
      this.domElements.push(generateButton);
    }
  }

  /**
   * prepare the popup
   * @param {string} string
   * @param {number} index
   * @private
   */
  _setupPopup(string, index) {
    if (this.initialized === true && this.allowCreation === true && this.popupCounter < this.popupLimit) {
      const div = document.createElement("div");
      div.id = "vis-configuration-popup";
      div.className = "vis-configuration-popup";
      div.innerText = string;
      div.onclick = () => {
        this._removePopup();
      };
      this.popupCounter += 1;
      this.popupDiv = {
        html: div,
        index: index
      };
    }
  }

  /**
   * remove the popup from the dom
   * @private
   */
  _removePopup() {
    if (this.popupDiv.html !== undefined) {
      this.popupDiv.html.parentNode.removeChild(this.popupDiv.html);
      clearTimeout(this.popupDiv.hideTimeout);
      clearTimeout(this.popupDiv.deleteTimeout);
      this.popupDiv = {};
    }
  }

  /**
   * Show the popup if it is needed.
   * @private
   */
  _showPopupIfNeeded() {
    if (this.popupDiv.html !== undefined) {
      const correspondingElement = this.domElements[this.popupDiv.index];
      const rect = correspondingElement.getBoundingClientRect();
      this.popupDiv.html.style.left = rect.left + "px";
      this.popupDiv.html.style.top = rect.top - 30 + "px"; // 30 is the height;
      document.body.appendChild(this.popupDiv.html);
      this.popupDiv.hideTimeout = _setTimeout(() => {
        this.popupDiv.html.style.opacity = 0;
      }, 1500);
      this.popupDiv.deleteTimeout = _setTimeout(() => {
        this._removePopup();
      }, 1800);
    }
  }

  /**
   * make a checkbox for boolean options.
   * @param {number} defaultValue
   * @param {number} value
   * @param {Array} path    | where to look for the actual option
   * @private
   */
  _makeCheckbox(defaultValue, value, path) {
    const checkbox = document.createElement("input");
    checkbox.type = "checkbox";
    checkbox.className = "vis-configuration vis-config-checkbox";
    checkbox.checked = defaultValue;
    if (value !== undefined) {
      checkbox.checked = value;
      if (value !== defaultValue) {
        if (typeof defaultValue === "object") {
          if (value !== defaultValue.enabled) {
            this.changedOptions.push({
              path: path,
              value: value
            });
          }
        } else {
          this.changedOptions.push({
            path: path,
            value: value
          });
        }
      }
    }
    const me = this;
    checkbox.onchange = function () {
      me._update(this.checked, path);
    };
    const label = this._makeLabel(path[path.length - 1], path);
    this._makeItem(path, label, checkbox);
  }

  /**
   * make a text input field for string options.
   * @param {number} defaultValue
   * @param {number} value
   * @param {Array} path    | where to look for the actual option
   * @private
   */
  _makeTextInput(defaultValue, value, path) {
    const checkbox = document.createElement("input");
    checkbox.type = "text";
    checkbox.className = "vis-configuration vis-config-text";
    checkbox.value = value;
    if (value !== defaultValue) {
      this.changedOptions.push({
        path: path,
        value: value
      });
    }
    const me = this;
    checkbox.onchange = function () {
      me._update(this.value, path);
    };
    const label = this._makeLabel(path[path.length - 1], path);
    this._makeItem(path, label, checkbox);
  }

  /**
   * make a color field with a color picker for color fields
   * @param {Array.<number>} arr
   * @param {number} value
   * @param {Array} path    | where to look for the actual option
   * @private
   */
  _makeColorField(arr, value, path) {
    const defaultColor = arr[1];
    const div = document.createElement("div");
    value = value === undefined ? defaultColor : value;
    if (value !== "none") {
      div.className = "vis-configuration vis-config-colorBlock";
      div.style.backgroundColor = value;
    } else {
      div.className = "vis-configuration vis-config-colorBlock none";
    }
    value = value === undefined ? defaultColor : value;
    div.onclick = () => {
      this._showColorPicker(value, div, path);
    };
    const label = this._makeLabel(path[path.length - 1], path);
    this._makeItem(path, label, div);
  }

  /**
   * used by the color buttons to call the color picker.
   * @param {number} value
   * @param {HTMLElement} div
   * @param {Array} path    | where to look for the actual option
   * @private
   */
  _showColorPicker(value, div, path) {
    // clear the callback from this div
    div.onclick = function () {};
    this.colorPicker.insertTo(div);
    this.colorPicker.show();
    this.colorPicker.setColor(value);
    this.colorPicker.setUpdateCallback(color => {
      const colorString = "rgba(" + color.r + "," + color.g + "," + color.b + "," + color.a + ")";
      div.style.backgroundColor = colorString;
      this._update(colorString, path);
    });

    // on close of the colorpicker, restore the callback.
    this.colorPicker.setCloseCallback(() => {
      div.onclick = () => {
        this._showColorPicker(value, div, path);
      };
    });
  }

  /**
   * parse an object and draw the correct items
   * @param {object} obj
   * @param {Array} [path]    | where to look for the actual option
   * @param {boolean} [checkOnly]
   * @returns {boolean}
   * @private
   */
  _handleObject(obj) {
    let path = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : [];
    let checkOnly = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : false;
    let show = false;
    const filter = _filterInstanceProperty(this.options);
    let visibleInSet = false;
    for (const subObj in obj) {
      if (Object.prototype.hasOwnProperty.call(obj, subObj)) {
        show = true;
        const item = obj[subObj];
        const newPath = copyAndExtendArray(path, subObj);
        if (typeof filter === "function") {
          show = filter(subObj, path);

          // if needed we must go deeper into the object.
          if (show === false) {
            if (!_Array$isArray(item) && typeof item !== "string" && typeof item !== "boolean" && item instanceof Object) {
              this.allowCreation = false;
              show = this._handleObject(item, newPath, true);
              this.allowCreation = checkOnly === false;
            }
          }
        }
        if (show !== false) {
          visibleInSet = true;
          const value = this._getValue(newPath);
          if (_Array$isArray(item)) {
            this._handleArray(item, value, newPath);
          } else if (typeof item === "string") {
            this._makeTextInput(item, value, newPath);
          } else if (typeof item === "boolean") {
            this._makeCheckbox(item, value, newPath);
          } else if (item instanceof Object) {
            // skip the options that are not enabled
            if (!this.hideOption(path, subObj, this.moduleOptions)) {
              // initially collapse options with an disabled enabled option.
              if (item.enabled !== undefined) {
                const enabledPath = copyAndExtendArray(newPath, "enabled");
                const enabledValue = this._getValue(enabledPath);
                if (enabledValue === true) {
                  const label = this._makeLabel(subObj, newPath, true);
                  this._makeItem(newPath, label);
                  visibleInSet = this._handleObject(item, newPath) || visibleInSet;
                } else {
                  this._makeCheckbox(item, enabledValue, newPath);
                }
              } else {
                const label = this._makeLabel(subObj, newPath, true);
                this._makeItem(newPath, label);
                visibleInSet = this._handleObject(item, newPath) || visibleInSet;
              }
            }
          } else {
            console.error("dont know how to handle", item, subObj, newPath);
          }
        }
      }
    }
    return visibleInSet;
  }

  /**
   * handle the array type of option
   * @param {Array.<number>} arr
   * @param {number} value
   * @param {Array} path    | where to look for the actual option
   * @private
   */
  _handleArray(arr, value, path) {
    if (typeof arr[0] === "string" && arr[0] === "color") {
      this._makeColorField(arr, value, path);
      if (arr[1] !== value) {
        this.changedOptions.push({
          path: path,
          value: value
        });
      }
    } else if (typeof arr[0] === "string") {
      this._makeDropdown(arr, value, path);
      if (arr[0] !== value) {
        this.changedOptions.push({
          path: path,
          value: value
        });
      }
    } else if (typeof arr[0] === "number") {
      this._makeRange(arr, value, path);
      if (arr[0] !== value) {
        this.changedOptions.push({
          path: path,
          value: Number(value)
        });
      }
    }
  }

  /**
   * called to update the network with the new settings.
   * @param {number} value
   * @param {Array} path    | where to look for the actual option
   * @private
   */
  _update(value, path) {
    const options = this._constructOptions(value, path);
    if (this.parent.body && this.parent.body.emitter && this.parent.body.emitter.emit) {
      this.parent.body.emitter.emit("configChange", options);
    }
    this.initialized = true;
    this.parent.setOptions(options);
  }

  /**
   *
   * @param {string | boolean} value
   * @param {Array.<string>} path
   * @param {{}} optionsObj
   * @returns {{}}
   * @private
   */
  _constructOptions(value, path) {
    let optionsObj = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};
    let pointer = optionsObj;

    // when dropdown boxes can be string or boolean, we typecast it into correct types
    value = value === "true" ? true : value;
    value = value === "false" ? false : value;
    for (let i = 0; i < path.length; i++) {
      if (path[i] !== "global") {
        if (pointer[path[i]] === undefined) {
          pointer[path[i]] = {};
        }
        if (i !== path.length - 1) {
          pointer = pointer[path[i]];
        } else {
          pointer[path[i]] = value;
        }
      }
    }
    return optionsObj;
  }

  /**
   * @private
   */
  _printOptions() {
    const options = this.getOptions();
    while (this.optionsContainer.firstChild) {
      this.optionsContainer.removeChild(this.optionsContainer.firstChild);
    }
    this.optionsContainer.appendChild(wrapInTag("pre", "const options = " + _JSON$stringify(options, null, 2)));
  }

  /**
   *
   * @returns {{}} options
   */
  getOptions() {
    const options = {};
    for (let i = 0; i < this.changedOptions.length; i++) {
      this._constructOptions(this.changedOptions[i].value, this.changedOptions[i].path, options);
    }
    return options;
  }
};

/**
 * Popup is a class to create a popup window with some text
 */
let Popup$1 = class Popup {
  /**
   * @param {Element} container       The container object.
   * @param {string}  overflowMethod  How the popup should act to overflowing ('flip' or 'cap')
   */
  constructor(container, overflowMethod) {
    this.container = container;
    this.overflowMethod = overflowMethod || "cap";
    this.x = 0;
    this.y = 0;
    this.padding = 5;
    this.hidden = false;

    // create the frame
    this.frame = document.createElement("div");
    this.frame.className = "vis-tooltip";
    this.container.appendChild(this.frame);
  }

  /**
   * @param {number} x   Horizontal position of the popup window
   * @param {number} y   Vertical position of the popup window
   */
  setPosition(x, y) {
    this.x = _parseInt(x);
    this.y = _parseInt(y);
  }

  /**
   * Set the content for the popup window. This can be HTML code or text.
   * @param {string | Element} content
   */
  setText(content) {
    if (content instanceof Element) {
      while (this.frame.firstChild) {
        this.frame.removeChild(this.frame.firstChild);
      }
      this.frame.appendChild(content);
    } else {
      // String containing literal text, element has to be used for HTML due to
      // XSS risks associated with innerHTML (i.e. prevent XSS by accident).
      this.frame.innerText = content;
    }
  }

  /**
   * Show the popup window
   * @param {boolean} [doShow]    Show or hide the window
   */
  show(doShow) {
    if (doShow === undefined) {
      doShow = true;
    }
    if (doShow === true) {
      const height = this.frame.clientHeight;
      const width = this.frame.clientWidth;
      const maxHeight = this.frame.parentNode.clientHeight;
      const maxWidth = this.frame.parentNode.clientWidth;
      let left = 0,
        top = 0;
      if (this.overflowMethod == "flip") {
        let isLeft = false,
          isTop = true; // Where around the position it's located

        if (this.y - height < this.padding) {
          isTop = false;
        }
        if (this.x + width > maxWidth - this.padding) {
          isLeft = true;
        }
        if (isLeft) {
          left = this.x - width;
        } else {
          left = this.x;
        }
        if (isTop) {
          top = this.y - height;
        } else {
          top = this.y;
        }
      } else {
        top = this.y - height;
        if (top + height + this.padding > maxHeight) {
          top = maxHeight - height - this.padding;
        }
        if (top < this.padding) {
          top = this.padding;
        }
        left = this.x;
        if (left + width + this.padding > maxWidth) {
          left = maxWidth - width - this.padding;
        }
        if (left < this.padding) {
          left = this.padding;
        }
      }
      this.frame.style.left = left + "px";
      this.frame.style.top = top + "px";
      this.frame.style.visibility = "visible";
      this.hidden = false;
    } else {
      this.hide();
    }
  }

  /**
   * Hide the popup window
   */
  hide() {
    this.hidden = true;
    this.frame.style.left = "0";
    this.frame.style.top = "0";
    this.frame.style.visibility = "hidden";
  }

  /**
   * Remove the popup window
   */
  destroy() {
    this.frame.parentNode.removeChild(this.frame); // Remove element from DOM
  }
};
let errorFound$1 = false;
let allOptions$3;
const VALIDATOR_PRINT_STYLE$1 = "background: #FFeeee; color: #dd0000";

/**
 *  Used to validate options.
 */
let Validator$1 = class Validator {
  /**
   * Main function to be called
   * @param {object} options
   * @param {object} referenceOptions
   * @param {object} subObject
   * @returns {boolean}
   * @static
   */
  static validate(options, referenceOptions, subObject) {
    errorFound$1 = false;
    allOptions$3 = referenceOptions;
    let usedOptions = referenceOptions;
    if (subObject !== undefined) {
      usedOptions = referenceOptions[subObject];
    }
    Validator.parse(options, usedOptions, []);
    return errorFound$1;
  }

  /**
   * Will traverse an object recursively and check every value
   * @param {object} options
   * @param {object} referenceOptions
   * @param {Array} path    | where to look for the actual option
   * @static
   */
  static parse(options, referenceOptions, path) {
    for (const option in options) {
      if (Object.prototype.hasOwnProperty.call(options, option)) {
        Validator.check(option, options, referenceOptions, path);
      }
    }
  }

  /**
   * Check every value. If the value is an object, call the parse function on that object.
   * @param {string} option
   * @param {object} options
   * @param {object} referenceOptions
   * @param {Array} path    | where to look for the actual option
   * @static
   */
  static check(option, options, referenceOptions, path) {
    if (referenceOptions[option] === undefined && referenceOptions.__any__ === undefined) {
      Validator.getSuggestion(option, referenceOptions, path);
      return;
    }
    let referenceOption = option;
    let is_object = true;
    if (referenceOptions[option] === undefined && referenceOptions.__any__ !== undefined) {
      // NOTE: This only triggers if the __any__ is in the top level of the options object.
      //       THAT'S A REALLY BAD PLACE TO ALLOW IT!!!!
      // TODO: Examine if needed, remove if possible

      // __any__ is a wildcard. Any value is accepted and will be further analysed by reference.
      referenceOption = "__any__";

      // if the any-subgroup is not a predefined object in the configurator,
      // we do not look deeper into the object.
      is_object = Validator.getType(options[option]) === "object";
    }
    let refOptionObj = referenceOptions[referenceOption];
    if (is_object && refOptionObj.__type__ !== undefined) {
      refOptionObj = refOptionObj.__type__;
    }
    Validator.checkFields(option, options, referenceOptions, referenceOption, refOptionObj, path);
  }

  /**
   *
   * @param {string}  option           | the option property
   * @param {object}  options          | The supplied options object
   * @param {object}  referenceOptions | The reference options containing all options and their allowed formats
   * @param {string}  referenceOption  | Usually this is the same as option, except when handling an __any__ tag.
   * @param {string}  refOptionObj     | This is the type object from the reference options
   * @param {Array}   path             | where in the object is the option
   * @static
   */
  static checkFields(option, options, referenceOptions, referenceOption, refOptionObj, path) {
    const log = function (message) {
      console.error("%c" + message + Validator.printLocation(path, option), VALIDATOR_PRINT_STYLE$1);
    };
    const optionType = Validator.getType(options[option]);
    const refOptionType = refOptionObj[optionType];
    if (refOptionType !== undefined) {
      // if the type is correct, we check if it is supposed to be one of a few select values
      if (Validator.getType(refOptionType) === "array" && _indexOfInstanceProperty(refOptionType).call(refOptionType, options[option]) === -1) {
        log('Invalid option detected in "' + option + '".' + " Allowed values are:" + Validator.print(refOptionType) + ' not "' + options[option] + '". ');
        errorFound$1 = true;
      } else if (optionType === "object" && referenceOption !== "__any__") {
        path = copyAndExtendArray(path, option);
        Validator.parse(options[option], referenceOptions[referenceOption], path);
      }
    } else if (refOptionObj["any"] === undefined) {
      // type of the field is incorrect and the field cannot be any
      log('Invalid type received for "' + option + '". Expected: ' + Validator.print(_Object$keys(refOptionObj)) + ". Received [" + optionType + '] "' + options[option] + '"');
      errorFound$1 = true;
    }
  }

  /**
   *
   * @param {object | boolean | number | string | Array.<number> | Date | Node | Moment | undefined | null} object
   * @returns {string}
   * @static
   */
  static getType(object) {
    const type = typeof object;
    if (type === "object") {
      if (object === null) {
        return "null";
      }
      if (object instanceof Boolean) {
        return "boolean";
      }
      if (object instanceof Number) {
        return "number";
      }
      if (object instanceof String) {
        return "string";
      }
      if (_Array$isArray(object)) {
        return "array";
      }
      if (object instanceof Date) {
        return "date";
      }
      if (object.nodeType !== undefined) {
        return "dom";
      }
      if (object._isAMomentObject === true) {
        return "moment";
      }
      return "object";
    } else if (type === "number") {
      return "number";
    } else if (type === "boolean") {
      return "boolean";
    } else if (type === "string") {
      return "string";
    } else if (type === undefined) {
      return "undefined";
    }
    return type;
  }

  /**
   * @param {string} option
   * @param {object} options
   * @param {Array.<string>} path
   * @static
   */
  static getSuggestion(option, options, path) {
    const localSearch = Validator.findInOptions(option, options, path, false);
    const globalSearch = Validator.findInOptions(option, allOptions$3, [], true);
    const localSearchThreshold = 8;
    const globalSearchThreshold = 4;
    let msg;
    if (localSearch.indexMatch !== undefined) {
      msg = " in " + Validator.printLocation(localSearch.path, option, "") + 'Perhaps it was incomplete? Did you mean: "' + localSearch.indexMatch + '"?\n\n';
    } else if (globalSearch.distance <= globalSearchThreshold && localSearch.distance > globalSearch.distance) {
      msg = " in " + Validator.printLocation(localSearch.path, option, "") + "Perhaps it was misplaced? Matching option found at: " + Validator.printLocation(globalSearch.path, globalSearch.closestMatch, "");
    } else if (localSearch.distance <= localSearchThreshold) {
      msg = '. Did you mean "' + localSearch.closestMatch + '"?' + Validator.printLocation(localSearch.path, option);
    } else {
      msg = ". Did you mean one of these: " + Validator.print(_Object$keys(options)) + Validator.printLocation(path, option);
    }
    console.error('%cUnknown option detected: "' + option + '"' + msg, VALIDATOR_PRINT_STYLE$1);
    errorFound$1 = true;
  }

  /**
   * traverse the options in search for a match.
   * @param {string} option
   * @param {object} options
   * @param {Array} path    | where to look for the actual option
   * @param {boolean} [recursive]
   * @returns {{closestMatch: string, path: Array, distance: number}}
   * @static
   */
  static findInOptions(option, options, path) {
    let recursive = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : false;
    let min = 1e9;
    let closestMatch = "";
    let closestMatchPath = [];
    const lowerCaseOption = option.toLowerCase();
    let indexMatch = undefined;
    for (const op in options) {
      let distance;
      if (options[op].__type__ !== undefined && recursive === true) {
        const result = Validator.findInOptions(option, options[op], copyAndExtendArray(path, op));
        if (min > result.distance) {
          closestMatch = result.closestMatch;
          closestMatchPath = result.path;
          min = result.distance;
          indexMatch = result.indexMatch;
        }
      } else {
        var _context1;
        if (_indexOfInstanceProperty(_context1 = op.toLowerCase()).call(_context1, lowerCaseOption) !== -1) {
          indexMatch = op;
        }
        distance = Validator.levenshteinDistance(option, op);
        if (min > distance) {
          closestMatch = op;
          closestMatchPath = copyArray(path);
          min = distance;
        }
      }
    }
    return {
      closestMatch: closestMatch,
      path: closestMatchPath,
      distance: min,
      indexMatch: indexMatch
    };
  }

  /**
   * @param {Array.<string>} path
   * @param {object} option
   * @param {string} prefix
   * @returns {string}
   * @static
   */
  static printLocation(path, option) {
    let prefix = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : "Problem value found at: \n";
    let str = "\n\n" + prefix + "options = {\n";
    for (let i = 0; i < path.length; i++) {
      for (let j = 0; j < i + 1; j++) {
        str += "  ";
      }
      str += path[i] + ": {\n";
    }
    for (let j = 0; j < path.length + 1; j++) {
      str += "  ";
    }
    str += option + "\n";
    for (let i = 0; i < path.length + 1; i++) {
      for (let j = 0; j < path.length - i; j++) {
        str += "  ";
      }
      str += "}\n";
    }
    return str + "\n\n";
  }

  /**
   * @param {object} options
   * @returns {string}
   * @static
   */
  static print(options) {
    return _JSON$stringify(options).replace(/(")|(\[)|(\])|(,"__type__")/g, "").replace(/(,)/g, ", ");
  }

  /**
   *  Compute the edit distance between the two given strings
   *  http://en.wikibooks.org/wiki/Algorithm_Implementation/Strings/Levenshtein_distance#JavaScript
   *
   *  Copyright (c) 2011 Andrei Mackenzie
   *
   *  Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
   *
   *  The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
   *
   *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
   * @param {string} a
   * @param {string} b
   * @returns {Array.<Array.<number>>}}
   * @static
   */
  static levenshteinDistance(a, b) {
    if (a.length === 0) return b.length;
    if (b.length === 0) return a.length;
    const matrix = [];

    // increment along the first column of each row
    let i;
    for (i = 0; i <= b.length; i++) {
      matrix[i] = [i];
    }

    // increment each column in the first row
    let j;
    for (j = 0; j <= a.length; j++) {
      matrix[0][j] = j;
    }

    // Fill in the rest of the matrix
    for (i = 1; i <= b.length; i++) {
      for (j = 1; j <= a.length; j++) {
        if (b.charAt(i - 1) == a.charAt(j - 1)) {
          matrix[i][j] = matrix[i - 1][j - 1];
        } else {
          matrix[i][j] = Math.min(matrix[i - 1][j - 1] + 1,
          // substitution
          Math.min(matrix[i][j - 1] + 1,
          // insertion
          matrix[i - 1][j] + 1)); // deletion
        }
      }
    }
    return matrix[b.length][a.length];
  }
};
const Activator$2 = Activator$1;
const ColorPicker$2 = ColorPicker$1;
const Configurator$2 = Configurator$1;
const Hammer$2 = Hammer$1;
const Popup$2 = Popup$1;
const VALIDATOR_PRINT_STYLE = VALIDATOR_PRINT_STYLE$1;
const Validator$2 = Validator$1;

var util$2 = /*#__PURE__*/Object.freeze({
	__proto__: null,
	Activator: Activator$2,
	Alea: Alea,
	ColorPicker: ColorPicker$2,
	Configurator: Configurator$2,
	DELETE: DELETE,
	HSVToHex: HSVToHex,
	HSVToRGB: HSVToRGB,
	Hammer: Hammer$2,
	Popup: Popup$2,
	RGBToHSV: RGBToHSV,
	RGBToHex: RGBToHex,
	VALIDATOR_PRINT_STYLE: VALIDATOR_PRINT_STYLE,
	Validator: Validator$2,
	addClassName: addClassName,
	addCssText: addCssText,
	binarySearchCustom: binarySearchCustom,
	binarySearchValue: binarySearchValue,
	bridgeObject: bridgeObject,
	copyAndExtendArray: copyAndExtendArray,
	copyArray: copyArray,
	deepExtend: deepExtend,
	deepObjectAssign: deepObjectAssign,
	easingFunctions: easingFunctions,
	equalArray: equalArray,
	extend: extend,
	fillIfDefined: fillIfDefined,
	forEach: forEach,
	getAbsoluteLeft: getAbsoluteLeft,
	getAbsoluteRight: getAbsoluteRight,
	getAbsoluteTop: getAbsoluteTop,
	getScrollBarWidth: getScrollBarWidth,
	getTarget: getTarget,
	getType: getType,
	hasParent: hasParent,
	hexToHSV: hexToHSV,
	hexToRGB: hexToRGB,
	insertSort: insertSort,
	isDate: isDate,
	isNumber: isNumber,
	isObject: isObject,
	isString: isString,
	isValidHex: isValidHex,
	isValidRGB: isValidRGB,
	isValidRGBA: isValidRGBA,
	mergeOptions: mergeOptions,
	option: option,
	overrideOpacity: overrideOpacity,
	parseColor: parseColor,
	preventDefault: preventDefault,
	pureDeepObjectAssign: pureDeepObjectAssign,
	recursiveDOMDelete: recursiveDOMDelete,
	removeClassName: removeClassName,
	removeCssText: removeCssText,
	selectiveBridgeObject: selectiveBridgeObject,
	selectiveDeepExtend: selectiveDeepExtend,
	selectiveExtend: selectiveExtend,
	selectiveNotDeepExtend: selectiveNotDeepExtend,
	throttle: throttle,
	toArray: toArray,
	topMost: topMost,
	updateProperty: updateProperty
});

var lib$1 = {exports: {}};

var _default$1 = {};

var lib = {exports: {}};

var _default = {};

/**
 * cssfilter
 *
 * @author 老雷<leizongmin@gmail.com>
 */

var hasRequired_default$1;

function require_default$1 () {
	if (hasRequired_default$1) return _default;
	hasRequired_default$1 = 1;
	function getDefaultWhiteList () {
	  // 白名单值说明：
	  // true: 允许该属性
	  // Function: function (val) { } 返回true表示允许该属性，其他值均表示不允许
	  // RegExp: regexp.test(val) 返回true表示允许该属性，其他值均表示不允许
	  // 除上面列出的值外均表示不允许
	  var whiteList = {};

	  whiteList['align-content'] = false; // default: auto
	  whiteList['align-items'] = false; // default: auto
	  whiteList['align-self'] = false; // default: auto
	  whiteList['alignment-adjust'] = false; // default: auto
	  whiteList['alignment-baseline'] = false; // default: baseline
	  whiteList['all'] = false; // default: depending on individual properties
	  whiteList['anchor-point'] = false; // default: none
	  whiteList['animation'] = false; // default: depending on individual properties
	  whiteList['animation-delay'] = false; // default: 0
	  whiteList['animation-direction'] = false; // default: normal
	  whiteList['animation-duration'] = false; // default: 0
	  whiteList['animation-fill-mode'] = false; // default: none
	  whiteList['animation-iteration-count'] = false; // default: 1
	  whiteList['animation-name'] = false; // default: none
	  whiteList['animation-play-state'] = false; // default: running
	  whiteList['animation-timing-function'] = false; // default: ease
	  whiteList['azimuth'] = false; // default: center
	  whiteList['backface-visibility'] = false; // default: visible
	  whiteList['background'] = true; // default: depending on individual properties
	  whiteList['background-attachment'] = true; // default: scroll
	  whiteList['background-clip'] = true; // default: border-box
	  whiteList['background-color'] = true; // default: transparent
	  whiteList['background-image'] = true; // default: none
	  whiteList['background-origin'] = true; // default: padding-box
	  whiteList['background-position'] = true; // default: 0% 0%
	  whiteList['background-repeat'] = true; // default: repeat
	  whiteList['background-size'] = true; // default: auto
	  whiteList['baseline-shift'] = false; // default: baseline
	  whiteList['binding'] = false; // default: none
	  whiteList['bleed'] = false; // default: 6pt
	  whiteList['bookmark-label'] = false; // default: content()
	  whiteList['bookmark-level'] = false; // default: none
	  whiteList['bookmark-state'] = false; // default: open
	  whiteList['border'] = true; // default: depending on individual properties
	  whiteList['border-bottom'] = true; // default: depending on individual properties
	  whiteList['border-bottom-color'] = true; // default: current color
	  whiteList['border-bottom-left-radius'] = true; // default: 0
	  whiteList['border-bottom-right-radius'] = true; // default: 0
	  whiteList['border-bottom-style'] = true; // default: none
	  whiteList['border-bottom-width'] = true; // default: medium
	  whiteList['border-collapse'] = true; // default: separate
	  whiteList['border-color'] = true; // default: depending on individual properties
	  whiteList['border-image'] = true; // default: none
	  whiteList['border-image-outset'] = true; // default: 0
	  whiteList['border-image-repeat'] = true; // default: stretch
	  whiteList['border-image-slice'] = true; // default: 100%
	  whiteList['border-image-source'] = true; // default: none
	  whiteList['border-image-width'] = true; // default: 1
	  whiteList['border-left'] = true; // default: depending on individual properties
	  whiteList['border-left-color'] = true; // default: current color
	  whiteList['border-left-style'] = true; // default: none
	  whiteList['border-left-width'] = true; // default: medium
	  whiteList['border-radius'] = true; // default: 0
	  whiteList['border-right'] = true; // default: depending on individual properties
	  whiteList['border-right-color'] = true; // default: current color
	  whiteList['border-right-style'] = true; // default: none
	  whiteList['border-right-width'] = true; // default: medium
	  whiteList['border-spacing'] = true; // default: 0
	  whiteList['border-style'] = true; // default: depending on individual properties
	  whiteList['border-top'] = true; // default: depending on individual properties
	  whiteList['border-top-color'] = true; // default: current color
	  whiteList['border-top-left-radius'] = true; // default: 0
	  whiteList['border-top-right-radius'] = true; // default: 0
	  whiteList['border-top-style'] = true; // default: none
	  whiteList['border-top-width'] = true; // default: medium
	  whiteList['border-width'] = true; // default: depending on individual properties
	  whiteList['bottom'] = false; // default: auto
	  whiteList['box-decoration-break'] = true; // default: slice
	  whiteList['box-shadow'] = true; // default: none
	  whiteList['box-sizing'] = true; // default: content-box
	  whiteList['box-snap'] = true; // default: none
	  whiteList['box-suppress'] = true; // default: show
	  whiteList['break-after'] = true; // default: auto
	  whiteList['break-before'] = true; // default: auto
	  whiteList['break-inside'] = true; // default: auto
	  whiteList['caption-side'] = false; // default: top
	  whiteList['chains'] = false; // default: none
	  whiteList['clear'] = true; // default: none
	  whiteList['clip'] = false; // default: auto
	  whiteList['clip-path'] = false; // default: none
	  whiteList['clip-rule'] = false; // default: nonzero
	  whiteList['color'] = true; // default: implementation dependent
	  whiteList['color-interpolation-filters'] = true; // default: auto
	  whiteList['column-count'] = false; // default: auto
	  whiteList['column-fill'] = false; // default: balance
	  whiteList['column-gap'] = false; // default: normal
	  whiteList['column-rule'] = false; // default: depending on individual properties
	  whiteList['column-rule-color'] = false; // default: current color
	  whiteList['column-rule-style'] = false; // default: medium
	  whiteList['column-rule-width'] = false; // default: medium
	  whiteList['column-span'] = false; // default: none
	  whiteList['column-width'] = false; // default: auto
	  whiteList['columns'] = false; // default: depending on individual properties
	  whiteList['contain'] = false; // default: none
	  whiteList['content'] = false; // default: normal
	  whiteList['counter-increment'] = false; // default: none
	  whiteList['counter-reset'] = false; // default: none
	  whiteList['counter-set'] = false; // default: none
	  whiteList['crop'] = false; // default: auto
	  whiteList['cue'] = false; // default: depending on individual properties
	  whiteList['cue-after'] = false; // default: none
	  whiteList['cue-before'] = false; // default: none
	  whiteList['cursor'] = false; // default: auto
	  whiteList['direction'] = false; // default: ltr
	  whiteList['display'] = true; // default: depending on individual properties
	  whiteList['display-inside'] = true; // default: auto
	  whiteList['display-list'] = true; // default: none
	  whiteList['display-outside'] = true; // default: inline-level
	  whiteList['dominant-baseline'] = false; // default: auto
	  whiteList['elevation'] = false; // default: level
	  whiteList['empty-cells'] = false; // default: show
	  whiteList['filter'] = false; // default: none
	  whiteList['flex'] = false; // default: depending on individual properties
	  whiteList['flex-basis'] = false; // default: auto
	  whiteList['flex-direction'] = false; // default: row
	  whiteList['flex-flow'] = false; // default: depending on individual properties
	  whiteList['flex-grow'] = false; // default: 0
	  whiteList['flex-shrink'] = false; // default: 1
	  whiteList['flex-wrap'] = false; // default: nowrap
	  whiteList['float'] = false; // default: none
	  whiteList['float-offset'] = false; // default: 0 0
	  whiteList['flood-color'] = false; // default: black
	  whiteList['flood-opacity'] = false; // default: 1
	  whiteList['flow-from'] = false; // default: none
	  whiteList['flow-into'] = false; // default: none
	  whiteList['font'] = true; // default: depending on individual properties
	  whiteList['font-family'] = true; // default: implementation dependent
	  whiteList['font-feature-settings'] = true; // default: normal
	  whiteList['font-kerning'] = true; // default: auto
	  whiteList['font-language-override'] = true; // default: normal
	  whiteList['font-size'] = true; // default: medium
	  whiteList['font-size-adjust'] = true; // default: none
	  whiteList['font-stretch'] = true; // default: normal
	  whiteList['font-style'] = true; // default: normal
	  whiteList['font-synthesis'] = true; // default: weight style
	  whiteList['font-variant'] = true; // default: normal
	  whiteList['font-variant-alternates'] = true; // default: normal
	  whiteList['font-variant-caps'] = true; // default: normal
	  whiteList['font-variant-east-asian'] = true; // default: normal
	  whiteList['font-variant-ligatures'] = true; // default: normal
	  whiteList['font-variant-numeric'] = true; // default: normal
	  whiteList['font-variant-position'] = true; // default: normal
	  whiteList['font-weight'] = true; // default: normal
	  whiteList['grid'] = false; // default: depending on individual properties
	  whiteList['grid-area'] = false; // default: depending on individual properties
	  whiteList['grid-auto-columns'] = false; // default: auto
	  whiteList['grid-auto-flow'] = false; // default: none
	  whiteList['grid-auto-rows'] = false; // default: auto
	  whiteList['grid-column'] = false; // default: depending on individual properties
	  whiteList['grid-column-end'] = false; // default: auto
	  whiteList['grid-column-start'] = false; // default: auto
	  whiteList['grid-row'] = false; // default: depending on individual properties
	  whiteList['grid-row-end'] = false; // default: auto
	  whiteList['grid-row-start'] = false; // default: auto
	  whiteList['grid-template'] = false; // default: depending on individual properties
	  whiteList['grid-template-areas'] = false; // default: none
	  whiteList['grid-template-columns'] = false; // default: none
	  whiteList['grid-template-rows'] = false; // default: none
	  whiteList['hanging-punctuation'] = false; // default: none
	  whiteList['height'] = true; // default: auto
	  whiteList['hyphens'] = false; // default: manual
	  whiteList['icon'] = false; // default: auto
	  whiteList['image-orientation'] = false; // default: auto
	  whiteList['image-resolution'] = false; // default: normal
	  whiteList['ime-mode'] = false; // default: auto
	  whiteList['initial-letters'] = false; // default: normal
	  whiteList['inline-box-align'] = false; // default: last
	  whiteList['justify-content'] = false; // default: auto
	  whiteList['justify-items'] = false; // default: auto
	  whiteList['justify-self'] = false; // default: auto
	  whiteList['left'] = false; // default: auto
	  whiteList['letter-spacing'] = true; // default: normal
	  whiteList['lighting-color'] = true; // default: white
	  whiteList['line-box-contain'] = false; // default: block inline replaced
	  whiteList['line-break'] = false; // default: auto
	  whiteList['line-grid'] = false; // default: match-parent
	  whiteList['line-height'] = false; // default: normal
	  whiteList['line-snap'] = false; // default: none
	  whiteList['line-stacking'] = false; // default: depending on individual properties
	  whiteList['line-stacking-ruby'] = false; // default: exclude-ruby
	  whiteList['line-stacking-shift'] = false; // default: consider-shifts
	  whiteList['line-stacking-strategy'] = false; // default: inline-line-height
	  whiteList['list-style'] = true; // default: depending on individual properties
	  whiteList['list-style-image'] = true; // default: none
	  whiteList['list-style-position'] = true; // default: outside
	  whiteList['list-style-type'] = true; // default: disc
	  whiteList['margin'] = true; // default: depending on individual properties
	  whiteList['margin-bottom'] = true; // default: 0
	  whiteList['margin-left'] = true; // default: 0
	  whiteList['margin-right'] = true; // default: 0
	  whiteList['margin-top'] = true; // default: 0
	  whiteList['marker-offset'] = false; // default: auto
	  whiteList['marker-side'] = false; // default: list-item
	  whiteList['marks'] = false; // default: none
	  whiteList['mask'] = false; // default: border-box
	  whiteList['mask-box'] = false; // default: see individual properties
	  whiteList['mask-box-outset'] = false; // default: 0
	  whiteList['mask-box-repeat'] = false; // default: stretch
	  whiteList['mask-box-slice'] = false; // default: 0 fill
	  whiteList['mask-box-source'] = false; // default: none
	  whiteList['mask-box-width'] = false; // default: auto
	  whiteList['mask-clip'] = false; // default: border-box
	  whiteList['mask-image'] = false; // default: none
	  whiteList['mask-origin'] = false; // default: border-box
	  whiteList['mask-position'] = false; // default: center
	  whiteList['mask-repeat'] = false; // default: no-repeat
	  whiteList['mask-size'] = false; // default: border-box
	  whiteList['mask-source-type'] = false; // default: auto
	  whiteList['mask-type'] = false; // default: luminance
	  whiteList['max-height'] = true; // default: none
	  whiteList['max-lines'] = false; // default: none
	  whiteList['max-width'] = true; // default: none
	  whiteList['min-height'] = true; // default: 0
	  whiteList['min-width'] = true; // default: 0
	  whiteList['move-to'] = false; // default: normal
	  whiteList['nav-down'] = false; // default: auto
	  whiteList['nav-index'] = false; // default: auto
	  whiteList['nav-left'] = false; // default: auto
	  whiteList['nav-right'] = false; // default: auto
	  whiteList['nav-up'] = false; // default: auto
	  whiteList['object-fit'] = false; // default: fill
	  whiteList['object-position'] = false; // default: 50% 50%
	  whiteList['opacity'] = false; // default: 1
	  whiteList['order'] = false; // default: 0
	  whiteList['orphans'] = false; // default: 2
	  whiteList['outline'] = false; // default: depending on individual properties
	  whiteList['outline-color'] = false; // default: invert
	  whiteList['outline-offset'] = false; // default: 0
	  whiteList['outline-style'] = false; // default: none
	  whiteList['outline-width'] = false; // default: medium
	  whiteList['overflow'] = false; // default: depending on individual properties
	  whiteList['overflow-wrap'] = false; // default: normal
	  whiteList['overflow-x'] = false; // default: visible
	  whiteList['overflow-y'] = false; // default: visible
	  whiteList['padding'] = true; // default: depending on individual properties
	  whiteList['padding-bottom'] = true; // default: 0
	  whiteList['padding-left'] = true; // default: 0
	  whiteList['padding-right'] = true; // default: 0
	  whiteList['padding-top'] = true; // default: 0
	  whiteList['page'] = false; // default: auto
	  whiteList['page-break-after'] = false; // default: auto
	  whiteList['page-break-before'] = false; // default: auto
	  whiteList['page-break-inside'] = false; // default: auto
	  whiteList['page-policy'] = false; // default: start
	  whiteList['pause'] = false; // default: implementation dependent
	  whiteList['pause-after'] = false; // default: implementation dependent
	  whiteList['pause-before'] = false; // default: implementation dependent
	  whiteList['perspective'] = false; // default: none
	  whiteList['perspective-origin'] = false; // default: 50% 50%
	  whiteList['pitch'] = false; // default: medium
	  whiteList['pitch-range'] = false; // default: 50
	  whiteList['play-during'] = false; // default: auto
	  whiteList['position'] = false; // default: static
	  whiteList['presentation-level'] = false; // default: 0
	  whiteList['quotes'] = false; // default: text
	  whiteList['region-fragment'] = false; // default: auto
	  whiteList['resize'] = false; // default: none
	  whiteList['rest'] = false; // default: depending on individual properties
	  whiteList['rest-after'] = false; // default: none
	  whiteList['rest-before'] = false; // default: none
	  whiteList['richness'] = false; // default: 50
	  whiteList['right'] = false; // default: auto
	  whiteList['rotation'] = false; // default: 0
	  whiteList['rotation-point'] = false; // default: 50% 50%
	  whiteList['ruby-align'] = false; // default: auto
	  whiteList['ruby-merge'] = false; // default: separate
	  whiteList['ruby-position'] = false; // default: before
	  whiteList['shape-image-threshold'] = false; // default: 0.0
	  whiteList['shape-outside'] = false; // default: none
	  whiteList['shape-margin'] = false; // default: 0
	  whiteList['size'] = false; // default: auto
	  whiteList['speak'] = false; // default: auto
	  whiteList['speak-as'] = false; // default: normal
	  whiteList['speak-header'] = false; // default: once
	  whiteList['speak-numeral'] = false; // default: continuous
	  whiteList['speak-punctuation'] = false; // default: none
	  whiteList['speech-rate'] = false; // default: medium
	  whiteList['stress'] = false; // default: 50
	  whiteList['string-set'] = false; // default: none
	  whiteList['tab-size'] = false; // default: 8
	  whiteList['table-layout'] = false; // default: auto
	  whiteList['text-align'] = true; // default: start
	  whiteList['text-align-last'] = true; // default: auto
	  whiteList['text-combine-upright'] = true; // default: none
	  whiteList['text-decoration'] = true; // default: none
	  whiteList['text-decoration-color'] = true; // default: currentColor
	  whiteList['text-decoration-line'] = true; // default: none
	  whiteList['text-decoration-skip'] = true; // default: objects
	  whiteList['text-decoration-style'] = true; // default: solid
	  whiteList['text-emphasis'] = true; // default: depending on individual properties
	  whiteList['text-emphasis-color'] = true; // default: currentColor
	  whiteList['text-emphasis-position'] = true; // default: over right
	  whiteList['text-emphasis-style'] = true; // default: none
	  whiteList['text-height'] = true; // default: auto
	  whiteList['text-indent'] = true; // default: 0
	  whiteList['text-justify'] = true; // default: auto
	  whiteList['text-orientation'] = true; // default: mixed
	  whiteList['text-overflow'] = true; // default: clip
	  whiteList['text-shadow'] = true; // default: none
	  whiteList['text-space-collapse'] = true; // default: collapse
	  whiteList['text-transform'] = true; // default: none
	  whiteList['text-underline-position'] = true; // default: auto
	  whiteList['text-wrap'] = true; // default: normal
	  whiteList['top'] = false; // default: auto
	  whiteList['transform'] = false; // default: none
	  whiteList['transform-origin'] = false; // default: 50% 50% 0
	  whiteList['transform-style'] = false; // default: flat
	  whiteList['transition'] = false; // default: depending on individual properties
	  whiteList['transition-delay'] = false; // default: 0s
	  whiteList['transition-duration'] = false; // default: 0s
	  whiteList['transition-property'] = false; // default: all
	  whiteList['transition-timing-function'] = false; // default: ease
	  whiteList['unicode-bidi'] = false; // default: normal
	  whiteList['vertical-align'] = false; // default: baseline
	  whiteList['visibility'] = false; // default: visible
	  whiteList['voice-balance'] = false; // default: center
	  whiteList['voice-duration'] = false; // default: auto
	  whiteList['voice-family'] = false; // default: implementation dependent
	  whiteList['voice-pitch'] = false; // default: medium
	  whiteList['voice-range'] = false; // default: medium
	  whiteList['voice-rate'] = false; // default: normal
	  whiteList['voice-stress'] = false; // default: normal
	  whiteList['voice-volume'] = false; // default: medium
	  whiteList['volume'] = false; // default: medium
	  whiteList['white-space'] = false; // default: normal
	  whiteList['widows'] = false; // default: 2
	  whiteList['width'] = true; // default: auto
	  whiteList['will-change'] = false; // default: auto
	  whiteList['word-break'] = true; // default: normal
	  whiteList['word-spacing'] = true; // default: normal
	  whiteList['word-wrap'] = true; // default: normal
	  whiteList['wrap-flow'] = false; // default: auto
	  whiteList['wrap-through'] = false; // default: wrap
	  whiteList['writing-mode'] = false; // default: horizontal-tb
	  whiteList['z-index'] = false; // default: auto

	  return whiteList;
	}


	/**
	 * 匹配到白名单上的一个属性时
	 *
	 * @param {String} name
	 * @param {String} value
	 * @param {Object} options
	 * @return {String}
	 */
	function onAttr (name, value, options) {
	  // do nothing
	}

	/**
	 * 匹配到不在白名单上的一个属性时
	 *
	 * @param {String} name
	 * @param {String} value
	 * @param {Object} options
	 * @return {String}
	 */
	function onIgnoreAttr (name, value, options) {
	  // do nothing
	}

	var REGEXP_URL_JAVASCRIPT = /javascript\s*\:/img;

	/**
	 * 过滤属性值
	 *
	 * @param {String} name
	 * @param {String} value
	 * @return {String}
	 */
	function safeAttrValue(name, value) {
	  if (REGEXP_URL_JAVASCRIPT.test(value)) return '';
	  return value;
	}


	_default.whiteList = getDefaultWhiteList();
	_default.getDefaultWhiteList = getDefaultWhiteList;
	_default.onAttr = onAttr;
	_default.onIgnoreAttr = onIgnoreAttr;
	_default.safeAttrValue = safeAttrValue;
	return _default;
}

var util$1;
var hasRequiredUtil$1;

function requireUtil$1 () {
	if (hasRequiredUtil$1) return util$1;
	hasRequiredUtil$1 = 1;
	util$1 = {
	  indexOf: function (arr, item) {
	    var i, j;
	    if (Array.prototype.indexOf) {
	      return arr.indexOf(item);
	    }
	    for (i = 0, j = arr.length; i < j; i++) {
	      if (arr[i] === item) {
	        return i;
	      }
	    }
	    return -1;
	  },
	  forEach: function (arr, fn, scope) {
	    var i, j;
	    if (Array.prototype.forEach) {
	      return arr.forEach(fn, scope);
	    }
	    for (i = 0, j = arr.length; i < j; i++) {
	      fn.call(scope, arr[i], i, arr);
	    }
	  },
	  trim: function (str) {
	    if (String.prototype.trim) {
	      return str.trim();
	    }
	    return str.replace(/(^\s*)|(\s*$)/g, '');
	  },
	  trimRight: function (str) {
	    if (String.prototype.trimRight) {
	      return str.trimRight();
	    }
	    return str.replace(/(\s*$)/g, '');
	  }
	};
	return util$1;
}

/**
 * cssfilter
 *
 * @author 老雷<leizongmin@gmail.com>
 */

var parser$1;
var hasRequiredParser$1;

function requireParser$1 () {
	if (hasRequiredParser$1) return parser$1;
	hasRequiredParser$1 = 1;
	var _ = requireUtil$1();


	/**
	 * 解析style
	 *
	 * @param {String} css
	 * @param {Function} onAttr 处理属性的函数
	 *   参数格式： function (sourcePosition, position, name, value, source)
	 * @return {String}
	 */
	function parseStyle (css, onAttr) {
	  css = _.trimRight(css);
	  if (css[css.length - 1] !== ';') css += ';';
	  var cssLength = css.length;
	  var isParenthesisOpen = false;
	  var lastPos = 0;
	  var i = 0;
	  var retCSS = '';

	  function addNewAttr () {
	    // 如果没有正常的闭合圆括号，则直接忽略当前属性
	    if (!isParenthesisOpen) {
	      var source = _.trim(css.slice(lastPos, i));
	      var j = source.indexOf(':');
	      if (j !== -1) {
	        var name = _.trim(source.slice(0, j));
	        var value = _.trim(source.slice(j + 1));
	        // 必须有属性名称
	        if (name) {
	          var ret = onAttr(lastPos, retCSS.length, name, value, source);
	          if (ret) retCSS += ret + '; ';
	        }
	      }
	    }
	    lastPos = i + 1;
	  }

	  for (; i < cssLength; i++) {
	    var c = css[i];
	    if (c === '/' && css[i + 1] === '*') {
	      // 备注开始
	      var j = css.indexOf('*/', i + 2);
	      // 如果没有正常的备注结束，则后面的部分全部跳过
	      if (j === -1) break;
	      // 直接将当前位置调到备注结尾，并且初始化状态
	      i = j + 1;
	      lastPos = i + 1;
	      isParenthesisOpen = false;
	    } else if (c === '(') {
	      isParenthesisOpen = true;
	    } else if (c === ')') {
	      isParenthesisOpen = false;
	    } else if (c === ';') {
	      if (isParenthesisOpen) ; else {
	        addNewAttr();
	      }
	    } else if (c === '\n') {
	      addNewAttr();
	    }
	  }

	  return _.trim(retCSS);
	}

	parser$1 = parseStyle;
	return parser$1;
}

/**
 * cssfilter
 *
 * @author 老雷<leizongmin@gmail.com>
 */

var css;
var hasRequiredCss;

function requireCss () {
	if (hasRequiredCss) return css;
	hasRequiredCss = 1;
	var DEFAULT = require_default$1();
	var parseStyle = requireParser$1();
	requireUtil$1();


	/**
	 * 返回值是否为空
	 *
	 * @param {Object} obj
	 * @return {Boolean}
	 */
	function isNull (obj) {
	  return (obj === undefined || obj === null);
	}

	/**
	 * 浅拷贝对象
	 *
	 * @param {Object} obj
	 * @return {Object}
	 */
	function shallowCopyObject (obj) {
	  var ret = {};
	  for (var i in obj) {
	    ret[i] = obj[i];
	  }
	  return ret;
	}

	/**
	 * 创建CSS过滤器
	 *
	 * @param {Object} options
	 *   - {Object} whiteList
	 *   - {Function} onAttr
	 *   - {Function} onIgnoreAttr
	 *   - {Function} safeAttrValue
	 */
	function FilterCSS (options) {
	  options = shallowCopyObject(options || {});
	  options.whiteList = options.whiteList || DEFAULT.whiteList;
	  options.onAttr = options.onAttr || DEFAULT.onAttr;
	  options.onIgnoreAttr = options.onIgnoreAttr || DEFAULT.onIgnoreAttr;
	  options.safeAttrValue = options.safeAttrValue || DEFAULT.safeAttrValue;
	  this.options = options;
	}

	FilterCSS.prototype.process = function (css) {
	  // 兼容各种奇葩输入
	  css = css || '';
	  css = css.toString();
	  if (!css) return '';

	  var me = this;
	  var options = me.options;
	  var whiteList = options.whiteList;
	  var onAttr = options.onAttr;
	  var onIgnoreAttr = options.onIgnoreAttr;
	  var safeAttrValue = options.safeAttrValue;

	  var retCSS = parseStyle(css, function (sourcePosition, position, name, value, source) {

	    var check = whiteList[name];
	    var isWhite = false;
	    if (check === true) isWhite = check;
	    else if (typeof check === 'function') isWhite = check(value);
	    else if (check instanceof RegExp) isWhite = check.test(value);
	    if (isWhite !== true) isWhite = false;

	    // 如果过滤后 value 为空则直接忽略
	    value = safeAttrValue(name, value);
	    if (!value) return;

	    var opts = {
	      position: position,
	      sourcePosition: sourcePosition,
	      source: source,
	      isWhite: isWhite
	    };

	    if (isWhite) {

	      var ret = onAttr(name, value, opts);
	      if (isNull(ret)) {
	        return name + ':' + value;
	      } else {
	        return ret;
	      }

	    } else {

	      var ret = onIgnoreAttr(name, value, opts);
	      if (!isNull(ret)) {
	        return ret;
	      }

	    }
	  });

	  return retCSS;
	};


	css = FilterCSS;
	return css;
}

/**
 * cssfilter
 *
 * @author 老雷<leizongmin@gmail.com>
 */

var hasRequiredLib$1;

function requireLib$1 () {
	if (hasRequiredLib$1) return lib.exports;
	hasRequiredLib$1 = 1;
	(function (module, exports) {
		var DEFAULT = require_default$1();
		var FilterCSS = requireCss();


		/**
		 * XSS过滤
		 *
		 * @param {String} css 要过滤的CSS代码
		 * @param {Object} options 选项：whiteList, onAttr, onIgnoreAttr
		 * @return {String}
		 */
		function filterCSS (html, options) {
		  var xss = new FilterCSS(options);
		  return xss.process(html);
		}


		// 输出
		exports = module.exports = filterCSS;
		exports.FilterCSS = FilterCSS;
		for (var i in DEFAULT) exports[i] = DEFAULT[i];

		// 在浏览器端使用
		if (typeof window !== 'undefined') {
		  window.filterCSS = module.exports;
		} 
	} (lib, lib.exports));
	return lib.exports;
}

var util;
var hasRequiredUtil;

function requireUtil () {
	if (hasRequiredUtil) return util;
	hasRequiredUtil = 1;
	util = {
	  indexOf: function (arr, item) {
	    var i, j;
	    if (Array.prototype.indexOf) {
	      return arr.indexOf(item);
	    }
	    for (i = 0, j = arr.length; i < j; i++) {
	      if (arr[i] === item) {
	        return i;
	      }
	    }
	    return -1;
	  },
	  forEach: function (arr, fn, scope) {
	    var i, j;
	    if (Array.prototype.forEach) {
	      return arr.forEach(fn, scope);
	    }
	    for (i = 0, j = arr.length; i < j; i++) {
	      fn.call(scope, arr[i], i, arr);
	    }
	  },
	  trim: function (str) {
	    if (String.prototype.trim) {
	      return str.trim();
	    }
	    return str.replace(/(^\s*)|(\s*$)/g, "");
	  },
	  spaceIndex: function (str) {
	    var reg = /\s|\n|\t/;
	    var match = reg.exec(str);
	    return match ? match.index : -1;
	  },
	};
	return util;
}

/**
 * default settings
 *
 * @author Zongmin Lei<leizongmin@gmail.com>
 */

var hasRequired_default;

function require_default () {
	if (hasRequired_default) return _default$1;
	hasRequired_default = 1;
	var FilterCSS = requireLib$1().FilterCSS;
	var getDefaultCSSWhiteList = requireLib$1().getDefaultWhiteList;
	var _ = requireUtil();

	function getDefaultWhiteList() {
	  return {
	    a: ["target", "href", "title"],
	    abbr: ["title"],
	    address: [],
	    area: ["shape", "coords", "href", "alt"],
	    article: [],
	    aside: [],
	    audio: [
	      "autoplay",
	      "controls",
	      "crossorigin",
	      "loop",
	      "muted",
	      "preload",
	      "src",
	    ],
	    b: [],
	    bdi: ["dir"],
	    bdo: ["dir"],
	    big: [],
	    blockquote: ["cite"],
	    br: [],
	    caption: [],
	    center: [],
	    cite: [],
	    code: [],
	    col: ["align", "valign", "span", "width"],
	    colgroup: ["align", "valign", "span", "width"],
	    dd: [],
	    del: ["datetime"],
	    details: ["open"],
	    div: [],
	    dl: [],
	    dt: [],
	    em: [],
	    figcaption: [],
	    figure: [],
	    font: ["color", "size", "face"],
	    footer: [],
	    h1: [],
	    h2: [],
	    h3: [],
	    h4: [],
	    h5: [],
	    h6: [],
	    header: [],
	    hr: [],
	    i: [],
	    img: ["src", "alt", "title", "width", "height", "loading"],
	    ins: ["datetime"],
	    kbd: [],
	    li: [],
	    mark: [],
	    nav: [],
	    ol: [],
	    p: [],
	    pre: [],
	    s: [],
	    section: [],
	    small: [],
	    span: [],
	    sub: [],
	    summary: [],
	    sup: [],
	    strong: [],
	    strike: [],
	    table: ["width", "border", "align", "valign"],
	    tbody: ["align", "valign"],
	    td: ["width", "rowspan", "colspan", "align", "valign"],
	    tfoot: ["align", "valign"],
	    th: ["width", "rowspan", "colspan", "align", "valign"],
	    thead: ["align", "valign"],
	    tr: ["rowspan", "align", "valign"],
	    tt: [],
	    u: [],
	    ul: [],
	    video: [
	      "autoplay",
	      "controls",
	      "crossorigin",
	      "loop",
	      "muted",
	      "playsinline",
	      "poster",
	      "preload",
	      "src",
	      "height",
	      "width",
	    ],
	  };
	}

	var defaultCSSFilter = new FilterCSS();

	/**
	 * default onTag function
	 *
	 * @param {String} tag
	 * @param {String} html
	 * @param {Object} options
	 * @return {String}
	 */
	function onTag(tag, html, options) {
	  // do nothing
	}

	/**
	 * default onIgnoreTag function
	 *
	 * @param {String} tag
	 * @param {String} html
	 * @param {Object} options
	 * @return {String}
	 */
	function onIgnoreTag(tag, html, options) {
	  // do nothing
	}

	/**
	 * default onTagAttr function
	 *
	 * @param {String} tag
	 * @param {String} name
	 * @param {String} value
	 * @return {String}
	 */
	function onTagAttr(tag, name, value) {
	  // do nothing
	}

	/**
	 * default onIgnoreTagAttr function
	 *
	 * @param {String} tag
	 * @param {String} name
	 * @param {String} value
	 * @return {String}
	 */
	function onIgnoreTagAttr(tag, name, value) {
	  // do nothing
	}

	/**
	 * default escapeHtml function
	 *
	 * @param {String} html
	 */
	function escapeHtml(html) {
	  return html.replace(REGEXP_LT, "&lt;").replace(REGEXP_GT, "&gt;");
	}

	/**
	 * default safeAttrValue function
	 *
	 * @param {String} tag
	 * @param {String} name
	 * @param {String} value
	 * @param {Object} cssFilter
	 * @return {String}
	 */
	function safeAttrValue(tag, name, value, cssFilter) {
	  // unescape attribute value firstly
	  value = friendlyAttrValue(value);

	  if (name === "href" || name === "src") {
	    // filter `href` and `src` attribute
	    // only allow the value that starts with `http://` | `https://` | `mailto:` | `/` | `#`
	    value = _.trim(value);
	    if (value === "#") return "#";
	    if (
	      !(
	        value.substr(0, 7) === "http://" ||
	        value.substr(0, 8) === "https://" ||
	        value.substr(0, 7) === "mailto:" ||
	        value.substr(0, 4) === "tel:" ||
	        value.substr(0, 11) === "data:image/" ||
	        value.substr(0, 6) === "ftp://" ||
	        value.substr(0, 2) === "./" ||
	        value.substr(0, 3) === "../" ||
	        value[0] === "#" ||
	        value[0] === "/"
	      )
	    ) {
	      return "";
	    }
	  } else if (name === "background") {
	    // filter `background` attribute (maybe no use)
	    // `javascript:`
	    REGEXP_DEFAULT_ON_TAG_ATTR_4.lastIndex = 0;
	    if (REGEXP_DEFAULT_ON_TAG_ATTR_4.test(value)) {
	      return "";
	    }
	  } else if (name === "style") {
	    // `expression()`
	    REGEXP_DEFAULT_ON_TAG_ATTR_7.lastIndex = 0;
	    if (REGEXP_DEFAULT_ON_TAG_ATTR_7.test(value)) {
	      return "";
	    }
	    // `url()`
	    REGEXP_DEFAULT_ON_TAG_ATTR_8.lastIndex = 0;
	    if (REGEXP_DEFAULT_ON_TAG_ATTR_8.test(value)) {
	      REGEXP_DEFAULT_ON_TAG_ATTR_4.lastIndex = 0;
	      if (REGEXP_DEFAULT_ON_TAG_ATTR_4.test(value)) {
	        return "";
	      }
	    }
	    if (cssFilter !== false) {
	      cssFilter = cssFilter || defaultCSSFilter;
	      value = cssFilter.process(value);
	    }
	  }

	  // escape `<>"` before returns
	  value = escapeAttrValue(value);
	  return value;
	}

	// RegExp list
	var REGEXP_LT = /</g;
	var REGEXP_GT = />/g;
	var REGEXP_QUOTE = /"/g;
	var REGEXP_QUOTE_2 = /&quot;/g;
	var REGEXP_ATTR_VALUE_1 = /&#([a-zA-Z0-9]*);?/gim;
	var REGEXP_ATTR_VALUE_COLON = /&colon;?/gim;
	var REGEXP_ATTR_VALUE_NEWLINE = /&newline;?/gim;
	// var REGEXP_DEFAULT_ON_TAG_ATTR_3 = /\/\*|\*\//gm;
	var REGEXP_DEFAULT_ON_TAG_ATTR_4 =
	  /((j\s*a\s*v\s*a|v\s*b|l\s*i\s*v\s*e)\s*s\s*c\s*r\s*i\s*p\s*t\s*|m\s*o\s*c\s*h\s*a):/gi;
	// var REGEXP_DEFAULT_ON_TAG_ATTR_5 = /^[\s"'`]*(d\s*a\s*t\s*a\s*)\:/gi;
	// var REGEXP_DEFAULT_ON_TAG_ATTR_6 = /^[\s"'`]*(d\s*a\s*t\s*a\s*)\:\s*image\//gi;
	var REGEXP_DEFAULT_ON_TAG_ATTR_7 =
	  /e\s*x\s*p\s*r\s*e\s*s\s*s\s*i\s*o\s*n\s*\(.*/gi;
	var REGEXP_DEFAULT_ON_TAG_ATTR_8 = /u\s*r\s*l\s*\(.*/gi;

	/**
	 * escape double quote
	 *
	 * @param {String} str
	 * @return {String} str
	 */
	function escapeQuote(str) {
	  return str.replace(REGEXP_QUOTE, "&quot;");
	}

	/**
	 * unescape double quote
	 *
	 * @param {String} str
	 * @return {String} str
	 */
	function unescapeQuote(str) {
	  return str.replace(REGEXP_QUOTE_2, '"');
	}

	/**
	 * escape html entities
	 *
	 * @param {String} str
	 * @return {String}
	 */
	function escapeHtmlEntities(str) {
	  return str.replace(REGEXP_ATTR_VALUE_1, function replaceUnicode(str, code) {
	    return code[0] === "x" || code[0] === "X"
	      ? String.fromCharCode(parseInt(code.substr(1), 16))
	      : String.fromCharCode(parseInt(code, 10));
	  });
	}

	/**
	 * escape html5 new danger entities
	 *
	 * @param {String} str
	 * @return {String}
	 */
	function escapeDangerHtml5Entities(str) {
	  return str
	    .replace(REGEXP_ATTR_VALUE_COLON, ":")
	    .replace(REGEXP_ATTR_VALUE_NEWLINE, " ");
	}

	/**
	 * clear nonprintable characters
	 *
	 * @param {String} str
	 * @return {String}
	 */
	function clearNonPrintableCharacter(str) {
	  var str2 = "";
	  for (var i = 0, len = str.length; i < len; i++) {
	    str2 += str.charCodeAt(i) < 32 ? " " : str.charAt(i);
	  }
	  return _.trim(str2);
	}

	/**
	 * get friendly attribute value
	 *
	 * @param {String} str
	 * @return {String}
	 */
	function friendlyAttrValue(str) {
	  str = unescapeQuote(str);
	  str = escapeHtmlEntities(str);
	  str = escapeDangerHtml5Entities(str);
	  str = clearNonPrintableCharacter(str);
	  return str;
	}

	/**
	 * unescape attribute value
	 *
	 * @param {String} str
	 * @return {String}
	 */
	function escapeAttrValue(str) {
	  str = escapeQuote(str);
	  str = escapeHtml(str);
	  return str;
	}

	/**
	 * `onIgnoreTag` function for removing all the tags that are not in whitelist
	 */
	function onIgnoreTagStripAll() {
	  return "";
	}

	/**
	 * remove tag body
	 * specify a `tags` list, if the tag is not in the `tags` list then process by the specify function (optional)
	 *
	 * @param {array} tags
	 * @param {function} next
	 */
	function StripTagBody(tags, next) {
	  if (typeof next !== "function") {
	    next = function () {};
	  }

	  var isRemoveAllTag = !Array.isArray(tags);
	  function isRemoveTag(tag) {
	    if (isRemoveAllTag) return true;
	    return _.indexOf(tags, tag) !== -1;
	  }

	  var removeList = [];
	  var posStart = false;

	  return {
	    onIgnoreTag: function (tag, html, options) {
	      if (isRemoveTag(tag)) {
	        if (options.isClosing) {
	          var ret = "[/removed]";
	          var end = options.position + ret.length;
	          removeList.push([
	            posStart !== false ? posStart : options.position,
	            end,
	          ]);
	          posStart = false;
	          return ret;
	        } else {
	          if (!posStart) {
	            posStart = options.position;
	          }
	          return "[removed]";
	        }
	      } else {
	        return next(tag, html, options);
	      }
	    },
	    remove: function (html) {
	      var rethtml = "";
	      var lastPos = 0;
	      _.forEach(removeList, function (pos) {
	        rethtml += html.slice(lastPos, pos[0]);
	        lastPos = pos[1];
	      });
	      rethtml += html.slice(lastPos);
	      return rethtml;
	    },
	  };
	}

	/**
	 * remove html comments
	 *
	 * @param {String} html
	 * @return {String}
	 */
	function stripCommentTag(html) {
	  var retHtml = "";
	  var lastPos = 0;
	  while (lastPos < html.length) {
	    var i = html.indexOf("<!--", lastPos);
	    if (i === -1) {
	      retHtml += html.slice(lastPos);
	      break;
	    }
	    retHtml += html.slice(lastPos, i);
	    var j = html.indexOf("-->", i);
	    if (j === -1) {
	      break;
	    }
	    lastPos = j + 3;
	  }
	  return retHtml;
	}

	/**
	 * remove invisible characters
	 *
	 * @param {String} html
	 * @return {String}
	 */
	function stripBlankChar(html) {
	  var chars = html.split("");
	  chars = chars.filter(function (char) {
	    var c = char.charCodeAt(0);
	    if (c === 127) return false;
	    if (c <= 31) {
	      if (c === 10 || c === 13) return true;
	      return false;
	    }
	    return true;
	  });
	  return chars.join("");
	}

	_default$1.whiteList = getDefaultWhiteList();
	_default$1.getDefaultWhiteList = getDefaultWhiteList;
	_default$1.onTag = onTag;
	_default$1.onIgnoreTag = onIgnoreTag;
	_default$1.onTagAttr = onTagAttr;
	_default$1.onIgnoreTagAttr = onIgnoreTagAttr;
	_default$1.safeAttrValue = safeAttrValue;
	_default$1.escapeHtml = escapeHtml;
	_default$1.escapeQuote = escapeQuote;
	_default$1.unescapeQuote = unescapeQuote;
	_default$1.escapeHtmlEntities = escapeHtmlEntities;
	_default$1.escapeDangerHtml5Entities = escapeDangerHtml5Entities;
	_default$1.clearNonPrintableCharacter = clearNonPrintableCharacter;
	_default$1.friendlyAttrValue = friendlyAttrValue;
	_default$1.escapeAttrValue = escapeAttrValue;
	_default$1.onIgnoreTagStripAll = onIgnoreTagStripAll;
	_default$1.StripTagBody = StripTagBody;
	_default$1.stripCommentTag = stripCommentTag;
	_default$1.stripBlankChar = stripBlankChar;
	_default$1.attributeWrapSign = '"';
	_default$1.cssFilter = defaultCSSFilter;
	_default$1.getDefaultCSSWhiteList = getDefaultCSSWhiteList;
	return _default$1;
}

var parser = {};

/**
 * Simple HTML Parser
 *
 * @author Zongmin Lei<leizongmin@gmail.com>
 */

var hasRequiredParser;

function requireParser () {
	if (hasRequiredParser) return parser;
	hasRequiredParser = 1;
	var _ = requireUtil();

	/**
	 * get tag name
	 *
	 * @param {String} html e.g. '<a hef="#">'
	 * @return {String}
	 */
	function getTagName(html) {
	  var i = _.spaceIndex(html);
	  var tagName;
	  if (i === -1) {
	    tagName = html.slice(1, -1);
	  } else {
	    tagName = html.slice(1, i + 1);
	  }
	  tagName = _.trim(tagName).toLowerCase();
	  if (tagName.slice(0, 1) === "/") tagName = tagName.slice(1);
	  if (tagName.slice(-1) === "/") tagName = tagName.slice(0, -1);
	  return tagName;
	}

	/**
	 * is close tag?
	 *
	 * @param {String} html 如：'<a hef="#">'
	 * @return {Boolean}
	 */
	function isClosing(html) {
	  return html.slice(0, 2) === "</";
	}

	/**
	 * parse input html and returns processed html
	 *
	 * @param {String} html
	 * @param {Function} onTag e.g. function (sourcePosition, position, tag, html, isClosing)
	 * @param {Function} escapeHtml
	 * @return {String}
	 */
	function parseTag(html, onTag, escapeHtml) {

	  var rethtml = "";
	  var lastPos = 0;
	  var tagStart = false;
	  var quoteStart = false;
	  var currentPos = 0;
	  var len = html.length;
	  var currentTagName = "";
	  var currentHtml = "";

	  chariterator: for (currentPos = 0; currentPos < len; currentPos++) {
	    var c = html.charAt(currentPos);
	    if (tagStart === false) {
	      if (c === "<") {
	        tagStart = currentPos;
	        continue;
	      }
	    } else {
	      if (quoteStart === false) {
	        if (c === "<") {
	          rethtml += escapeHtml(html.slice(lastPos, currentPos));
	          tagStart = currentPos;
	          lastPos = currentPos;
	          continue;
	        }
	        if (c === ">" || currentPos === len - 1) {
	          rethtml += escapeHtml(html.slice(lastPos, tagStart));
	          currentHtml = html.slice(tagStart, currentPos + 1);
	          currentTagName = getTagName(currentHtml);
	          rethtml += onTag(
	            tagStart,
	            rethtml.length,
	            currentTagName,
	            currentHtml,
	            isClosing(currentHtml)
	          );
	          lastPos = currentPos + 1;
	          tagStart = false;
	          continue;
	        }
	        if (c === '"' || c === "'") {
	          var i = 1;
	          var ic = html.charAt(currentPos - i);

	          while (ic.trim() === "" || ic === "=") {
	            if (ic === "=") {
	              quoteStart = c;
	              continue chariterator;
	            }
	            ic = html.charAt(currentPos - ++i);
	          }
	        }
	      } else {
	        if (c === quoteStart) {
	          quoteStart = false;
	          continue;
	        }
	      }
	    }
	  }
	  if (lastPos < len) {
	    rethtml += escapeHtml(html.substr(lastPos));
	  }

	  return rethtml;
	}

	var REGEXP_ILLEGAL_ATTR_NAME = /[^a-zA-Z0-9\\_:.-]/gim;

	/**
	 * parse input attributes and returns processed attributes
	 *
	 * @param {String} html e.g. `href="#" target="_blank"`
	 * @param {Function} onAttr e.g. `function (name, value)`
	 * @return {String}
	 */
	function parseAttr(html, onAttr) {

	  var lastPos = 0;
	  var lastMarkPos = 0;
	  var retAttrs = [];
	  var tmpName = false;
	  var len = html.length;

	  function addAttr(name, value) {
	    name = _.trim(name);
	    name = name.replace(REGEXP_ILLEGAL_ATTR_NAME, "").toLowerCase();
	    if (name.length < 1) return;
	    var ret = onAttr(name, value || "");
	    if (ret) retAttrs.push(ret);
	  }

	  // 逐个分析字符
	  for (var i = 0; i < len; i++) {
	    var c = html.charAt(i);
	    var v, j;
	    if (tmpName === false && c === "=") {
	      tmpName = html.slice(lastPos, i);
	      lastPos = i + 1;
	      lastMarkPos = html.charAt(lastPos) === '"' || html.charAt(lastPos) === "'" ? lastPos : findNextQuotationMark(html, i + 1);
	      continue;
	    }
	    if (tmpName !== false) {
	      if (
	        i === lastMarkPos
	      ) {
	        j = html.indexOf(c, i + 1);
	        if (j === -1) {
	          break;
	        } else {
	          v = _.trim(html.slice(lastMarkPos + 1, j));
	          addAttr(tmpName, v);
	          tmpName = false;
	          i = j;
	          lastPos = i + 1;
	          continue;
	        }
	      }
	    }
	    if (/\s|\n|\t/.test(c)) {
	      html = html.replace(/\s|\n|\t/g, " ");
	      if (tmpName === false) {
	        j = findNextEqual(html, i);
	        if (j === -1) {
	          v = _.trim(html.slice(lastPos, i));
	          addAttr(v);
	          tmpName = false;
	          lastPos = i + 1;
	          continue;
	        } else {
	          i = j - 1;
	          continue;
	        }
	      } else {
	        j = findBeforeEqual(html, i - 1);
	        if (j === -1) {
	          v = _.trim(html.slice(lastPos, i));
	          v = stripQuoteWrap(v);
	          addAttr(tmpName, v);
	          tmpName = false;
	          lastPos = i + 1;
	          continue;
	        } else {
	          continue;
	        }
	      }
	    }
	  }

	  if (lastPos < html.length) {
	    if (tmpName === false) {
	      addAttr(html.slice(lastPos));
	    } else {
	      addAttr(tmpName, stripQuoteWrap(_.trim(html.slice(lastPos))));
	    }
	  }

	  return _.trim(retAttrs.join(" "));
	}

	function findNextEqual(str, i) {
	  for (; i < str.length; i++) {
	    var c = str[i];
	    if (c === " ") continue;
	    if (c === "=") return i;
	    return -1;
	  }
	}

	function findNextQuotationMark(str, i) {
	  for (; i < str.length; i++) {
	    var c = str[i];
	    if (c === " ") continue;
	    if (c === "'" || c === '"') return i;
	    return -1;
	  }
	}

	function findBeforeEqual(str, i) {
	  for (; i > 0; i--) {
	    var c = str[i];
	    if (c === " ") continue;
	    if (c === "=") return i;
	    return -1;
	  }
	}

	function isQuoteWrapString(text) {
	  if (
	    (text[0] === '"' && text[text.length - 1] === '"') ||
	    (text[0] === "'" && text[text.length - 1] === "'")
	  ) {
	    return true;
	  } else {
	    return false;
	  }
	}

	function stripQuoteWrap(text) {
	  if (isQuoteWrapString(text)) {
	    return text.substr(1, text.length - 2);
	  } else {
	    return text;
	  }
	}

	parser.parseTag = parseTag;
	parser.parseAttr = parseAttr;
	return parser;
}

/**
 * filter xss
 *
 * @author Zongmin Lei<leizongmin@gmail.com>
 */

var xss;
var hasRequiredXss;

function requireXss () {
	if (hasRequiredXss) return xss;
	hasRequiredXss = 1;
	var FilterCSS = requireLib$1().FilterCSS;
	var DEFAULT = require_default();
	var parser = requireParser();
	var parseTag = parser.parseTag;
	var parseAttr = parser.parseAttr;
	var _ = requireUtil();

	/**
	 * returns `true` if the input value is `undefined` or `null`
	 *
	 * @param {Object} obj
	 * @return {Boolean}
	 */
	function isNull(obj) {
	  return obj === undefined || obj === null;
	}

	/**
	 * get attributes for a tag
	 *
	 * @param {String} html
	 * @return {Object}
	 *   - {String} html
	 *   - {Boolean} closing
	 */
	function getAttrs(html) {
	  var i = _.spaceIndex(html);
	  if (i === -1) {
	    return {
	      html: "",
	      closing: html[html.length - 2] === "/",
	    };
	  }
	  html = _.trim(html.slice(i + 1, -1));
	  var isClosing = html[html.length - 1] === "/";
	  if (isClosing) html = _.trim(html.slice(0, -1));
	  return {
	    html: html,
	    closing: isClosing,
	  };
	}

	/**
	 * shallow copy
	 *
	 * @param {Object} obj
	 * @return {Object}
	 */
	function shallowCopyObject(obj) {
	  var ret = {};
	  for (var i in obj) {
	    ret[i] = obj[i];
	  }
	  return ret;
	}

	function keysToLowerCase(obj) {
	  var ret = {};
	  for (var i in obj) {
	    if (Array.isArray(obj[i])) {
	      ret[i.toLowerCase()] = obj[i].map(function (item) {
	        return item.toLowerCase();
	      });
	    } else {
	      ret[i.toLowerCase()] = obj[i];
	    }
	  }
	  return ret;
	}

	/**
	 * FilterXSS class
	 *
	 * @param {Object} options
	 *        whiteList (or allowList), onTag, onTagAttr, onIgnoreTag,
	 *        onIgnoreTagAttr, safeAttrValue, escapeHtml
	 *        stripIgnoreTagBody, allowCommentTag, stripBlankChar
	 *        css{whiteList, onAttr, onIgnoreAttr} `css=false` means don't use `cssfilter`
	 */
	function FilterXSS(options) {
	  options = shallowCopyObject(options || {});

	  if (options.stripIgnoreTag) {
	    if (options.onIgnoreTag) {
	      console.error(
	        'Notes: cannot use these two options "stripIgnoreTag" and "onIgnoreTag" at the same time'
	      );
	    }
	    options.onIgnoreTag = DEFAULT.onIgnoreTagStripAll;
	  }
	  if (options.whiteList || options.allowList) {
	    options.whiteList = keysToLowerCase(options.whiteList || options.allowList);
	  } else {
	    options.whiteList = DEFAULT.whiteList;
	  }

	  this.attributeWrapSign = options.singleQuotedAttributeValue === true ? "'" : DEFAULT.attributeWrapSign;

	  options.onTag = options.onTag || DEFAULT.onTag;
	  options.onTagAttr = options.onTagAttr || DEFAULT.onTagAttr;
	  options.onIgnoreTag = options.onIgnoreTag || DEFAULT.onIgnoreTag;
	  options.onIgnoreTagAttr = options.onIgnoreTagAttr || DEFAULT.onIgnoreTagAttr;
	  options.safeAttrValue = options.safeAttrValue || DEFAULT.safeAttrValue;
	  options.escapeHtml = options.escapeHtml || DEFAULT.escapeHtml;
	  this.options = options;

	  if (options.css === false) {
	    this.cssFilter = false;
	  } else {
	    options.css = options.css || {};
	    this.cssFilter = new FilterCSS(options.css);
	  }
	}

	/**
	 * start process and returns result
	 *
	 * @param {String} html
	 * @return {String}
	 */
	FilterXSS.prototype.process = function (html) {
	  // compatible with the input
	  html = html || "";
	  html = html.toString();
	  if (!html) return "";

	  var me = this;
	  var options = me.options;
	  var whiteList = options.whiteList;
	  var onTag = options.onTag;
	  var onIgnoreTag = options.onIgnoreTag;
	  var onTagAttr = options.onTagAttr;
	  var onIgnoreTagAttr = options.onIgnoreTagAttr;
	  var safeAttrValue = options.safeAttrValue;
	  var escapeHtml = options.escapeHtml;
	  var attributeWrapSign = me.attributeWrapSign;
	  var cssFilter = me.cssFilter;

	  // remove invisible characters
	  if (options.stripBlankChar) {
	    html = DEFAULT.stripBlankChar(html);
	  }

	  // remove html comments
	  if (!options.allowCommentTag) {
	    html = DEFAULT.stripCommentTag(html);
	  }

	  // if enable stripIgnoreTagBody
	  var stripIgnoreTagBody = false;
	  if (options.stripIgnoreTagBody) {
	    stripIgnoreTagBody = DEFAULT.StripTagBody(
	      options.stripIgnoreTagBody,
	      onIgnoreTag
	    );
	    onIgnoreTag = stripIgnoreTagBody.onIgnoreTag;
	  }

	  var retHtml = parseTag(
	    html,
	    function (sourcePosition, position, tag, html, isClosing) {
	      var info = {
	        sourcePosition: sourcePosition,
	        position: position,
	        isClosing: isClosing,
	        isWhite: Object.prototype.hasOwnProperty.call(whiteList, tag),
	      };

	      // call `onTag()`
	      var ret = onTag(tag, html, info);
	      if (!isNull(ret)) return ret;

	      if (info.isWhite) {
	        if (info.isClosing) {
	          return "</" + tag + ">";
	        }

	        var attrs = getAttrs(html);
	        var whiteAttrList = whiteList[tag];
	        var attrsHtml = parseAttr(attrs.html, function (name, value) {
	          // call `onTagAttr()`
	          var isWhiteAttr = _.indexOf(whiteAttrList, name) !== -1;
	          var ret = onTagAttr(tag, name, value, isWhiteAttr);
	          if (!isNull(ret)) return ret;

	          if (isWhiteAttr) {
	            // call `safeAttrValue()`
	            value = safeAttrValue(tag, name, value, cssFilter);
	            if (value) {
	              return name + '=' + attributeWrapSign + value + attributeWrapSign;
	            } else {
	              return name;
	            }
	          } else {
	            // call `onIgnoreTagAttr()`
	            ret = onIgnoreTagAttr(tag, name, value, isWhiteAttr);
	            if (!isNull(ret)) return ret;
	            return;
	          }
	        });

	        // build new tag html
	        html = "<" + tag;
	        if (attrsHtml) html += " " + attrsHtml;
	        if (attrs.closing) html += " /";
	        html += ">";
	        return html;
	      } else {
	        // call `onIgnoreTag()`
	        ret = onIgnoreTag(tag, html, info);
	        if (!isNull(ret)) return ret;
	        return escapeHtml(html);
	      }
	    },
	    escapeHtml
	  );

	  // if enable stripIgnoreTagBody
	  if (stripIgnoreTagBody) {
	    retHtml = stripIgnoreTagBody.remove(retHtml);
	  }

	  return retHtml;
	};

	xss = FilterXSS;
	return xss;
}

/**
 * xss
 *
 * @author Zongmin Lei<leizongmin@gmail.com>
 */

var hasRequiredLib;

function requireLib () {
	if (hasRequiredLib) return lib$1.exports;
	hasRequiredLib = 1;
	(function (module, exports) {
		var DEFAULT = require_default();
		var parser = requireParser();
		var FilterXSS = requireXss();

		/**
		 * filter xss function
		 *
		 * @param {String} html
		 * @param {Object} options { whiteList, onTag, onTagAttr, onIgnoreTag, onIgnoreTagAttr, safeAttrValue, escapeHtml }
		 * @return {String}
		 */
		function filterXSS(html, options) {
		  var xss = new FilterXSS(options);
		  return xss.process(html);
		}

		exports = module.exports = filterXSS;
		exports.filterXSS = filterXSS;
		exports.FilterXSS = FilterXSS;

		(function () {
		  for (var i in DEFAULT) {
		    exports[i] = DEFAULT[i];
		  }
		  for (var j in parser) {
		    exports[j] = parser[j];
		  }
		})();

		// using `xss` on the browser, output `filterXSS` to the globals
		if (typeof window !== "undefined") {
		  window.filterXSS = module.exports;
		}

		// using `xss` on the WebWorker, output `filterXSS` to the globals
		function isWorkerEnv() {
		  return (
		    typeof self !== "undefined" &&
		    typeof DedicatedWorkerGlobalScope !== "undefined" &&
		    self instanceof DedicatedWorkerGlobalScope
		  );
		}
		if (isWorkerEnv()) {
		  self.filterXSS = module.exports;
		} 
	} (lib$1, lib$1.exports));
	return lib$1.exports;
}

var libExports = requireLib();
var xssFilter = /*@__PURE__*/getDefaultExportFromCjs(libExports);

const byteToHex = [];
for (let i = 0; i < 256; ++i) {
    byteToHex.push((i + 0x100).toString(16).slice(1));
}
function unsafeStringify(arr, offset = 0) {
    return (byteToHex[arr[offset + 0]] +
        byteToHex[arr[offset + 1]] +
        byteToHex[arr[offset + 2]] +
        byteToHex[arr[offset + 3]] +
        '-' +
        byteToHex[arr[offset + 4]] +
        byteToHex[arr[offset + 5]] +
        '-' +
        byteToHex[arr[offset + 6]] +
        byteToHex[arr[offset + 7]] +
        '-' +
        byteToHex[arr[offset + 8]] +
        byteToHex[arr[offset + 9]] +
        '-' +
        byteToHex[arr[offset + 10]] +
        byteToHex[arr[offset + 11]] +
        byteToHex[arr[offset + 12]] +
        byteToHex[arr[offset + 13]] +
        byteToHex[arr[offset + 14]] +
        byteToHex[arr[offset + 15]]).toLowerCase();
}

let getRandomValues;
const rnds8 = new Uint8Array(16);
function rng() {
    if (!getRandomValues) {
        if (typeof crypto === 'undefined' || !crypto.getRandomValues) {
            throw new Error('crypto.getRandomValues() not supported. See https://github.com/uuidjs/uuid#getrandomvalues-not-supported');
        }
        getRandomValues = crypto.getRandomValues.bind(crypto);
    }
    return getRandomValues(rnds8);
}

const randomUUID = typeof crypto !== 'undefined' && crypto.randomUUID && crypto.randomUUID.bind(crypto);
var native = { randomUUID };

function _v4(options, buf, offset) {
    options = options || {};
    const rnds = options.random ?? options.rng?.() ?? rng();
    if (rnds.length < 16) {
        throw new Error('Random bytes length must be >= 16');
    }
    rnds[6] = (rnds[6] & 0x0f) | 0x40;
    rnds[8] = (rnds[8] & 0x3f) | 0x80;
    return unsafeStringify(rnds);
}
function v4(options, buf, offset) {
    if (native.randomUUID && true && !options) {
        return native.randomUUID();
    }
    return _v4(options);
}

function ownKeys(e, r) { var t = _Object$keys(e); if (_Object$getOwnPropertySymbols) { var o = _Object$getOwnPropertySymbols(e); r && (o = _filterInstanceProperty(o).call(o, function (r) { return _Object$getOwnPropertyDescriptor(e, r).enumerable; })), t.push.apply(t, o); } return t; }
function _objectSpread(e) { for (var r = 1; r < arguments.length; r++) { var _context8, _context9; var t = null != arguments[r] ? arguments[r] : {}; r % 2 ? _forEachInstanceProperty(_context8 = ownKeys(Object(t), true)).call(_context8, function (r) { _defineProperty(e, r, t[r]); }) : _Object$getOwnPropertyDescriptors ? _Object$defineProperties(e, _Object$getOwnPropertyDescriptors(t)) : _forEachInstanceProperty(_context9 = ownKeys(Object(t))).call(_context9, function (r) { _Object$defineProperty(e, r, _Object$getOwnPropertyDescriptor(t, r)); }); } return e; }
/**
 * Test if an object implements the DataView interface from vis-data.
 * Uses the idProp property instead of expecting a hardcoded id field "id".
 * @param {Object} obj The object to test.
 * @returns {boolean} True if the object implements vis-data DataView interface otherwise false.
 */
function isDataViewLike(obj) {
  var _obj$idProp;
  if (!obj) {
    return false;
  }
  let idProp = (_obj$idProp = obj.idProp) !== null && _obj$idProp !== void 0 ? _obj$idProp : obj._idProp;
  if (!idProp) {
    return false;
  }
  return isDataViewLike$1(idProp, obj);
}

// parse ASP.Net Date pattern,
// for example '/Date(1198908717056)/' or '/Date(1198908717056-0700)/'
// code from http://momentjs.com/
const ASPDateRegex = /^\/?Date\((-?\d+)/i;
const NumericRegex = /^\d+$/;
/**
 * Convert an object into another type
 *
 * @param {Object} object - Value of unknown type.
 * @param {string} type - Name of the desired type.
 *
 * @returns {Object} Object in the desired type.
 * @throws Error
 */
function convert(object, type) {
  let match;
  if (object === undefined) {
    return undefined;
  }
  if (object === null) {
    return null;
  }
  if (!type) {
    return object;
  }
  if (!(typeof type === "string") && !(type instanceof String)) {
    throw new Error("Type must be a string");
  }

  //noinspection FallthroughInSwitchStatementJS
  switch (type) {
    case "boolean":
    case "Boolean":
      return Boolean(object);
    case "number":
    case "Number":
      if (isString(object) && !isNaN(Date.parse(object))) {
        return moment$3(object).valueOf();
      } else {
        // @TODO: I don't think that Number and String constructors are a good idea.
        // This could also fail if the object doesn't have valueOf method or if it's redefined.
        // For example: Object.create(null) or { valueOf: 7 }.
        return Number(object.valueOf());
      }
    case "string":
    case "String":
      return String(object);
    case "Date":
      try {
        return convert(object, "Moment").toDate();
      } catch (e) {
        if (e instanceof TypeError) {
          throw new TypeError("Cannot convert object of type " + getType(object) + " to type " + type);
        } else {
          throw e;
        }
      }
    case "Moment":
      if (isNumber(object)) {
        return moment$3(object);
      }
      if (object instanceof Date) {
        return moment$3(object.valueOf());
      } else if (moment$3.isMoment(object)) {
        return moment$3(object);
      }
      if (isString(object)) {
        match = ASPDateRegex.exec(object);
        if (match) {
          // object is an ASP date
          return moment$3(Number(match[1])); // parse number
        }
        match = NumericRegex.exec(object);
        if (match) {
          return moment$3(Number(object));
        }
        return moment$3(object); // parse string
      } else {
        throw new TypeError("Cannot convert object of type " + getType(object) + " to type " + type);
      }
    case "ISODate":
      if (isNumber(object)) {
        return new Date(object);
      } else if (object instanceof Date) {
        return object.toISOString();
      } else if (moment$3.isMoment(object)) {
        return object.toDate().toISOString();
      } else if (isString(object)) {
        match = ASPDateRegex.exec(object);
        if (match) {
          // object is an ASP date
          return new Date(Number(match[1])).toISOString(); // parse number
        } else {
          return moment$3(object).format(); // ISO 8601
        }
      } else {
        throw new Error("Cannot convert object of type " + getType(object) + " to type ISODate");
      }
    case "ASPDate":
      if (isNumber(object)) {
        return "/Date(" + object + ")/";
      } else if (object instanceof Date || moment$3.isMoment(object)) {
        return "/Date(" + object.valueOf() + ")/";
      } else if (isString(object)) {
        match = ASPDateRegex.exec(object);
        let value;
        if (match) {
          // object is an ASP date
          value = new Date(Number(match[1])).valueOf(); // parse number
        } else {
          value = new Date(object).valueOf(); // parse string
        }
        return "/Date(" + value + ")/";
      } else {
        throw new Error("Cannot convert object of type " + getType(object) + " to type ASPDate");
      }
    default:
      throw new Error("Unknown type ".concat(type));
  }
}

/**
 * Create a Data Set like wrapper to seamlessly coerce data types.
 *
 * @param {Object} rawDS - The Data Set with raw uncoerced data.
 * @param {Object} type - A record assigning a data type to property name.
 * @param {string} type.start - Data type name of property 'start'. Default: Date.
 * @param {string} type.end - Data type name of property 'end'. Default: Date.
 *
 * @remarks
 * The write operations (`add`, `remove`, `update` and `updateOnly`) write into
 * the raw (uncoerced) data set. These values are then picked up by a pipe
 * which coerces the values using the [[convert]] function and feeds them into
 * the coerced data set. When querying (`forEach`, `get`, `getIds`, `off` and
 * `on`) the values are then fetched from the coerced data set and already have
 * the required data types. The values are coerced only once when inserted and
 * then the same value is returned each time until it is updated or deleted.
 *
 * For example: `typeCoercedDataSet.add({ id: 7, start: "2020-01-21" })` would
 * result in `typeCoercedDataSet.get(7)` returning `{ id: 7, start: moment(new
 * Date("2020-01-21")).toDate() }`.
 *
 * Use the dispose method prior to throwing a reference to this away. Otherwise
 * the pipe connecting the two Data Sets will keep the unaccessible coerced
 * Data Set alive and updated as long as the raw Data Set exists.
 *
 * @returns {Object} A Data Set like object that saves data into the raw Data Set and
 * retrieves them from the coerced Data Set.
 */
function typeCoerceDataSet(rawDS) {
  var _context, _context3, _context4, _context5, _context6, _context7;
  let type = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {
    start: "Date",
    end: "Date"
  };
  const idProp = rawDS._idProp;
  const coercedDS = new DataSet({
    fieldId: idProp
  });
  const pipe = _mapInstanceProperty(_context = createNewDataPipeFrom(rawDS)).call(_context, item => {
    var _context2;
    return _reduceInstanceProperty(_context2 = _Object$keys(item)).call(_context2, (acc, key) => {
      acc[key] = convert(item[key], type[key]);
      return acc;
    }, {});
  }).to(coercedDS);
  pipe.all().start();
  return {
    // Write only.
    add: function () {
      return rawDS.getDataSet().add(...arguments);
    },
    remove: function () {
      return rawDS.getDataSet().remove(...arguments);
    },
    update: function () {
      return rawDS.getDataSet().update(...arguments);
    },
    updateOnly: function () {
      return rawDS.getDataSet().updateOnly(...arguments);
    },
    clear: function () {
      return rawDS.getDataSet().clear(...arguments);
    },
    // Read only.
    forEach: _bindInstanceProperty(_context3 = _forEachInstanceProperty(coercedDS)).call(_context3, coercedDS),
    get: _bindInstanceProperty(_context4 = coercedDS.get).call(_context4, coercedDS),
    getIds: _bindInstanceProperty(_context5 = coercedDS.getIds).call(_context5, coercedDS),
    off: _bindInstanceProperty(_context6 = coercedDS.off).call(_context6, coercedDS),
    on: _bindInstanceProperty(_context7 = coercedDS.on).call(_context7, coercedDS),
    get length() {
      return coercedDS.length;
    },
    // Non standard.
    idProp,
    type,
    rawDS,
    coercedDS,
    dispose: () => pipe.stop()
  };
}

// Configure XSS protection
const setupXSSCleaner = options => {
  const customXSS = new xssFilter.FilterXSS(options);
  return input => {
    if (typeof input === "string") {
      return customXSS.process(input);
    }
    return input; // Leave other types unchanged
  };
};
const setupNoOpCleaner = string => string;

// when nothing else is configured: filter XSS with the lib's default options
let configuredXSSProtection = setupXSSCleaner();
const setupXSSProtection = options => {
  // No options? Do nothing.
  if (!options) {
    return;
  }

  // Disable XSS protection completely on request
  if (options.disabled === true) {
    configuredXSSProtection = setupNoOpCleaner;
    console.warn("You disabled XSS protection for vis-Timeline. I sure hope you know what you're doing!");
  } else {
    // Configure XSS protection with some custom options.
    // For a list of valid options check the lib's documentation:
    // https://github.com/leizongmin/js-xss#custom-filter-rules
    if (options.filterOptions) {
      configuredXSSProtection = setupXSSCleaner(options.filterOptions);
    }
  }
};
const availableUtils = _objectSpread(_objectSpread({}, util$2), {}, {
  convert,
  setupXSSProtection
});
_Object$defineProperty(availableUtils, "xss", {
  get: function () {
    return configuredXSSProtection;
  }
});

var es_parseFloat = {};

var numberParseFloat;
var hasRequiredNumberParseFloat;

function requireNumberParseFloat () {
	if (hasRequiredNumberParseFloat) return numberParseFloat;
	hasRequiredNumberParseFloat = 1;
	var globalThis = /*@__PURE__*/ requireGlobalThis();
	var fails = /*@__PURE__*/ requireFails();
	var uncurryThis = /*@__PURE__*/ requireFunctionUncurryThis();
	var toString = /*@__PURE__*/ requireToString();
	var trim = /*@__PURE__*/ requireStringTrim().trim;
	var whitespaces = /*@__PURE__*/ requireWhitespaces();

	var charAt = uncurryThis(''.charAt);
	var $parseFloat = globalThis.parseFloat;
	var Symbol = globalThis.Symbol;
	var ITERATOR = Symbol && Symbol.iterator;
	var FORCED = 1 / $parseFloat(whitespaces + '-0') !== -Infinity
	  // MS Edge 18- broken with boxed symbols
	  || (ITERATOR && !fails(function () { $parseFloat(Object(ITERATOR)); }));

	// `parseFloat` method
	// https://tc39.es/ecma262/#sec-parsefloat-string
	numberParseFloat = FORCED ? function parseFloat(string) {
	  var trimmedString = trim(toString(string));
	  var result = $parseFloat(trimmedString);
	  return result === 0 && charAt(trimmedString, 0) === '-' ? -0 : result;
	} : $parseFloat;
	return numberParseFloat;
}

var hasRequiredEs_parseFloat;

function requireEs_parseFloat () {
	if (hasRequiredEs_parseFloat) return es_parseFloat;
	hasRequiredEs_parseFloat = 1;
	var $ = /*@__PURE__*/ require_export();
	var $parseFloat = /*@__PURE__*/ requireNumberParseFloat();

	// `parseFloat` method
	// https://tc39.es/ecma262/#sec-parsefloat-string
	$({ global: true, forced: parseFloat !== $parseFloat }, {
	  parseFloat: $parseFloat
	});
	return es_parseFloat;
}

var _parseFloat$3;
var hasRequired_parseFloat$2;

function require_parseFloat$2 () {
	if (hasRequired_parseFloat$2) return _parseFloat$3;
	hasRequired_parseFloat$2 = 1;
	requireEs_parseFloat();
	var path = /*@__PURE__*/ requirePath();

	_parseFloat$3 = path.parseFloat;
	return _parseFloat$3;
}

var _parseFloat$2;
var hasRequired_parseFloat$1;

function require_parseFloat$1 () {
	if (hasRequired_parseFloat$1) return _parseFloat$2;
	hasRequired_parseFloat$1 = 1;
	var parent = /*@__PURE__*/ require_parseFloat$2();

	_parseFloat$2 = parent;
	return _parseFloat$2;
}

var _parseFloat$1;
var hasRequired_parseFloat;

function require_parseFloat () {
	if (hasRequired_parseFloat) return _parseFloat$1;
	hasRequired_parseFloat = 1;
	_parseFloat$1 = /*@__PURE__*/ require_parseFloat$1();
	return _parseFloat$1;
}

var _parseFloatExports = require_parseFloat();
var _parseFloat = /*@__PURE__*/getDefaultExportFromCjs(_parseFloatExports);

/** Prototype for visual components */
class Component {
  /**
   */
  constructor() {
    this.options = null;
    this.props = null;
  }

  /**
   * Set options for the component. The new options will be merged into the
   * current options.
   * @param {Object} options
   */
  setOptions(options) {
    if (options) {
      availableUtils.extend(this.options, options);
    }
  }

  /**
   * Repaint the component
   * @return {boolean} Returns true if the component is resized
   */
  redraw() {
    // should be implemented by the component
    return false;
  }

  /**
   * Destroy the component. Cleanup DOM and event listeners
   */
  destroy() {
    // should be implemented by the component
  }

  /**
   * Test whether the component is resized since the last time _isResized() was
   * called.
   * @return {Boolean} Returns true if the component is resized
   * @protected
   */
  _isResized() {
    const resized = this.props._previousWidth !== this.props.width || this.props._previousHeight !== this.props.height;
    this.props._previousWidth = this.props.width;
    this.props._previousHeight = this.props.height;
    return resized;
  }
}

var es_string_repeat = {};

var hasRequiredEs_string_repeat;

function requireEs_string_repeat () {
	if (hasRequiredEs_string_repeat) return es_string_repeat;
	hasRequiredEs_string_repeat = 1;
	var $ = /*@__PURE__*/ require_export();
	var repeat = /*@__PURE__*/ requireStringRepeat();

	// `String.prototype.repeat` method
	// https://tc39.es/ecma262/#sec-string.prototype.repeat
	$({ target: 'String', proto: true }, {
	  repeat: repeat
	});
	return es_string_repeat;
}

var repeat$3;
var hasRequiredRepeat$3;

function requireRepeat$3 () {
	if (hasRequiredRepeat$3) return repeat$3;
	hasRequiredRepeat$3 = 1;
	requireEs_string_repeat();
	var getBuiltInPrototypeMethod = /*@__PURE__*/ requireGetBuiltInPrototypeMethod();

	repeat$3 = getBuiltInPrototypeMethod('String', 'repeat');
	return repeat$3;
}

var repeat$2;
var hasRequiredRepeat$2;

function requireRepeat$2 () {
	if (hasRequiredRepeat$2) return repeat$2;
	hasRequiredRepeat$2 = 1;
	var isPrototypeOf = /*@__PURE__*/ requireObjectIsPrototypeOf();
	var method = /*@__PURE__*/ requireRepeat$3();

	var StringPrototype = String.prototype;

	repeat$2 = function (it) {
	  var own = it.repeat;
	  return typeof it == 'string' || it === StringPrototype
	    || (isPrototypeOf(StringPrototype, it) && own === StringPrototype.repeat) ? method : own;
	};
	return repeat$2;
}

var repeat$1;
var hasRequiredRepeat$1;

function requireRepeat$1 () {
	if (hasRequiredRepeat$1) return repeat$1;
	hasRequiredRepeat$1 = 1;
	var parent = /*@__PURE__*/ requireRepeat$2();

	repeat$1 = parent;
	return repeat$1;
}

var repeat;
var hasRequiredRepeat;

function requireRepeat () {
	if (hasRequiredRepeat) return repeat;
	hasRequiredRepeat = 1;
	repeat = /*@__PURE__*/ requireRepeat$1();
	return repeat;
}

var repeatExports = requireRepeat();
var _repeatInstanceProperty = /*@__PURE__*/getDefaultExportFromCjs(repeatExports);

var es_array_sort = {};

var arraySort;
var hasRequiredArraySort;

function requireArraySort () {
	if (hasRequiredArraySort) return arraySort;
	hasRequiredArraySort = 1;
	var arraySlice = /*@__PURE__*/ requireArraySlice();

	var floor = Math.floor;

	var sort = function (array, comparefn) {
	  var length = array.length;

	  if (length < 8) {
	    // insertion sort
	    var i = 1;
	    var element, j;

	    while (i < length) {
	      j = i;
	      element = array[i];
	      while (j && comparefn(array[j - 1], element) > 0) {
	        array[j] = array[--j];
	      }
	      if (j !== i++) array[j] = element;
	    }
	  } else {
	    // merge sort
	    var middle = floor(length / 2);
	    var left = sort(arraySlice(array, 0, middle), comparefn);
	    var right = sort(arraySlice(array, middle), comparefn);
	    var llength = left.length;
	    var rlength = right.length;
	    var lindex = 0;
	    var rindex = 0;

	    while (lindex < llength || rindex < rlength) {
	      array[lindex + rindex] = (lindex < llength && rindex < rlength)
	        ? comparefn(left[lindex], right[rindex]) <= 0 ? left[lindex++] : right[rindex++]
	        : lindex < llength ? left[lindex++] : right[rindex++];
	    }
	  }

	  return array;
	};

	arraySort = sort;
	return arraySort;
}

var environmentFfVersion;
var hasRequiredEnvironmentFfVersion;

function requireEnvironmentFfVersion () {
	if (hasRequiredEnvironmentFfVersion) return environmentFfVersion;
	hasRequiredEnvironmentFfVersion = 1;
	var userAgent = /*@__PURE__*/ requireEnvironmentUserAgent();

	var firefox = userAgent.match(/firefox\/(\d+)/i);

	environmentFfVersion = !!firefox && +firefox[1];
	return environmentFfVersion;
}

var environmentIsIeOrEdge;
var hasRequiredEnvironmentIsIeOrEdge;

function requireEnvironmentIsIeOrEdge () {
	if (hasRequiredEnvironmentIsIeOrEdge) return environmentIsIeOrEdge;
	hasRequiredEnvironmentIsIeOrEdge = 1;
	var UA = /*@__PURE__*/ requireEnvironmentUserAgent();

	environmentIsIeOrEdge = /MSIE|Trident/.test(UA);
	return environmentIsIeOrEdge;
}

var environmentWebkitVersion;
var hasRequiredEnvironmentWebkitVersion;

function requireEnvironmentWebkitVersion () {
	if (hasRequiredEnvironmentWebkitVersion) return environmentWebkitVersion;
	hasRequiredEnvironmentWebkitVersion = 1;
	var userAgent = /*@__PURE__*/ requireEnvironmentUserAgent();

	var webkit = userAgent.match(/AppleWebKit\/(\d+)\./);

	environmentWebkitVersion = !!webkit && +webkit[1];
	return environmentWebkitVersion;
}

var hasRequiredEs_array_sort;

function requireEs_array_sort () {
	if (hasRequiredEs_array_sort) return es_array_sort;
	hasRequiredEs_array_sort = 1;
	var $ = /*@__PURE__*/ require_export();
	var uncurryThis = /*@__PURE__*/ requireFunctionUncurryThis();
	var aCallable = /*@__PURE__*/ requireACallable();
	var toObject = /*@__PURE__*/ requireToObject();
	var lengthOfArrayLike = /*@__PURE__*/ requireLengthOfArrayLike();
	var deletePropertyOrThrow = /*@__PURE__*/ requireDeletePropertyOrThrow();
	var toString = /*@__PURE__*/ requireToString();
	var fails = /*@__PURE__*/ requireFails();
	var internalSort = /*@__PURE__*/ requireArraySort();
	var arrayMethodIsStrict = /*@__PURE__*/ requireArrayMethodIsStrict();
	var FF = /*@__PURE__*/ requireEnvironmentFfVersion();
	var IE_OR_EDGE = /*@__PURE__*/ requireEnvironmentIsIeOrEdge();
	var V8 = /*@__PURE__*/ requireEnvironmentV8Version();
	var WEBKIT = /*@__PURE__*/ requireEnvironmentWebkitVersion();

	var test = [];
	var nativeSort = uncurryThis(test.sort);
	var push = uncurryThis(test.push);

	// IE8-
	var FAILS_ON_UNDEFINED = fails(function () {
	  test.sort(undefined);
	});
	// V8 bug
	var FAILS_ON_NULL = fails(function () {
	  test.sort(null);
	});
	// Old WebKit
	var STRICT_METHOD = arrayMethodIsStrict('sort');

	var STABLE_SORT = !fails(function () {
	  // feature detection can be too slow, so check engines versions
	  if (V8) return V8 < 70;
	  if (FF && FF > 3) return;
	  if (IE_OR_EDGE) return true;
	  if (WEBKIT) return WEBKIT < 603;

	  var result = '';
	  var code, chr, value, index;

	  // generate an array with more 512 elements (Chakra and old V8 fails only in this case)
	  for (code = 65; code < 76; code++) {
	    chr = String.fromCharCode(code);

	    switch (code) {
	      case 66: case 69: case 70: case 72: value = 3; break;
	      case 68: case 71: value = 4; break;
	      default: value = 2;
	    }

	    for (index = 0; index < 47; index++) {
	      test.push({ k: chr + index, v: value });
	    }
	  }

	  test.sort(function (a, b) { return b.v - a.v; });

	  for (index = 0; index < test.length; index++) {
	    chr = test[index].k.charAt(0);
	    if (result.charAt(result.length - 1) !== chr) result += chr;
	  }

	  return result !== 'DGBEFHACIJK';
	});

	var FORCED = FAILS_ON_UNDEFINED || !FAILS_ON_NULL || !STRICT_METHOD || !STABLE_SORT;

	var getSortCompare = function (comparefn) {
	  return function (x, y) {
	    if (y === undefined) return -1;
	    if (x === undefined) return 1;
	    if (comparefn !== undefined) return +comparefn(x, y) || 0;
	    return toString(x) > toString(y) ? 1 : -1;
	  };
	};

	// `Array.prototype.sort` method
	// https://tc39.es/ecma262/#sec-array.prototype.sort
	$({ target: 'Array', proto: true, forced: FORCED }, {
	  sort: function sort(comparefn) {
	    if (comparefn !== undefined) aCallable(comparefn);

	    var array = toObject(this);

	    if (STABLE_SORT) return comparefn === undefined ? nativeSort(array) : nativeSort(array, comparefn);

	    var items = [];
	    var arrayLength = lengthOfArrayLike(array);
	    var itemsLength, index;

	    for (index = 0; index < arrayLength; index++) {
	      if (index in array) push(items, array[index]);
	    }

	    internalSort(items, getSortCompare(comparefn));

	    itemsLength = lengthOfArrayLike(items);
	    index = 0;

	    while (index < itemsLength) array[index] = items[index++];
	    while (index < arrayLength) deletePropertyOrThrow(array, index++);

	    return array;
	  }
	});
	return es_array_sort;
}

var sort$3;
var hasRequiredSort$3;

function requireSort$3 () {
	if (hasRequiredSort$3) return sort$3;
	hasRequiredSort$3 = 1;
	requireEs_array_sort();
	var getBuiltInPrototypeMethod = /*@__PURE__*/ requireGetBuiltInPrototypeMethod();

	sort$3 = getBuiltInPrototypeMethod('Array', 'sort');
	return sort$3;
}

var sort$2;
var hasRequiredSort$2;

function requireSort$2 () {
	if (hasRequiredSort$2) return sort$2;
	hasRequiredSort$2 = 1;
	var isPrototypeOf = /*@__PURE__*/ requireObjectIsPrototypeOf();
	var method = /*@__PURE__*/ requireSort$3();

	var ArrayPrototype = Array.prototype;

	sort$2 = function (it) {
	  var own = it.sort;
	  return it === ArrayPrototype || (isPrototypeOf(ArrayPrototype, it) && own === ArrayPrototype.sort) ? method : own;
	};
	return sort$2;
}

var sort$1;
var hasRequiredSort$1;

function requireSort$1 () {
	if (hasRequiredSort$1) return sort$1;
	hasRequiredSort$1 = 1;
	var parent = /*@__PURE__*/ requireSort$2();

	sort$1 = parent;
	return sort$1;
}

var sort;
var hasRequiredSort;

function requireSort () {
	if (hasRequiredSort) return sort;
	hasRequiredSort = 1;
	sort = /*@__PURE__*/ requireSort$1();
	return sort;
}

var sortExports = requireSort();
var _sortInstanceProperty = /*@__PURE__*/getDefaultExportFromCjs(sortExports);

/**
 * used in Core to convert the options into a volatile variable
 *
 * @param {function} moment
 * @param {Object} body
 * @param {Array | Object} hiddenDates
 * @returns {number}
 */
function convertHiddenOptions(moment, body, hiddenDates) {
  if (hiddenDates && !_Array$isArray(hiddenDates)) {
    return convertHiddenOptions(moment, body, [hiddenDates]);
  }
  body.hiddenDates = [];
  if (hiddenDates) {
    if (_Array$isArray(hiddenDates) == true) {
      var _context;
      for (let i = 0; i < hiddenDates.length; i++) {
        if (_repeatInstanceProperty(hiddenDates[i]) === undefined) {
          const dateItem = {};
          dateItem.start = moment(hiddenDates[i].start).toDate().valueOf();
          dateItem.end = moment(hiddenDates[i].end).toDate().valueOf();
          body.hiddenDates.push(dateItem);
        }
      }
      _sortInstanceProperty(_context = body.hiddenDates).call(_context, (a, b) => a.start - b.start); // sort by start time
    }
  }
}

/**
 * create new entrees for the repeating hidden dates
 *
 * @param {function} moment
 * @param {Object} body
 * @param {Array | Object} hiddenDates
 * @returns {null}
 */
function updateHiddenDates(moment, body, hiddenDates) {
  if (hiddenDates && !_Array$isArray(hiddenDates)) {
    return updateHiddenDates(moment, body, [hiddenDates]);
  }
  if (hiddenDates && body.domProps.centerContainer.width !== undefined) {
    convertHiddenOptions(moment, body, hiddenDates);
    const start = moment(body.range.start);
    const end = moment(body.range.end);
    const totalRange = body.range.end - body.range.start;
    const pixelTime = totalRange / body.domProps.centerContainer.width;
    for (let i = 0; i < hiddenDates.length; i++) {
      if (_repeatInstanceProperty(hiddenDates[i]) !== undefined) {
        let startDate = moment(hiddenDates[i].start);
        let endDate = moment(hiddenDates[i].end);
        if (startDate._d == "Invalid Date") {
          throw new Error("Supplied start date is not valid: ".concat(hiddenDates[i].start));
        }
        if (endDate._d == "Invalid Date") {
          throw new Error("Supplied end date is not valid: ".concat(hiddenDates[i].end));
        }
        const duration = endDate - startDate;
        if (duration >= 4 * pixelTime) {
          let offset = 0;
          let runUntil = end.clone();
          switch (_repeatInstanceProperty(hiddenDates[i])) {
            case "daily":
              // case of time
              if (startDate.day() != endDate.day()) {
                offset = 1;
              }
              startDate = startDate.dayOfYear(start.dayOfYear()).year(start.year()).subtract(7, "days");
              endDate = endDate.dayOfYear(start.dayOfYear()).year(start.year()).subtract(7 - offset, "days");
              runUntil.add(1, "weeks");
              break;
            case "weekly":
              {
                const dayOffset = endDate.diff(startDate, "days");
                const day = startDate.day();

                // set the start date to the range.start
                startDate = startDate.date(start.date()).month(start.month()).year(start.year());
                endDate = startDate.clone();

                // force
                startDate = startDate.day(day).subtract(1, "weeks");
                endDate = endDate.day(day).add(dayOffset, "days").subtract(1, "weeks");
                runUntil.add(1, "weeks");
                break;
              }
            case "monthly":
              if (startDate.month() != endDate.month()) {
                offset = 1;
              }
              startDate = startDate.month(start.month()).year(start.year()).subtract(1, "months");
              endDate = endDate.month(start.month()).year(start.year()).subtract(1, "months").add(offset, "months");
              runUntil.add(1, "months");
              break;
            case "yearly":
              if (startDate.year() != endDate.year()) {
                offset = 1;
              }
              startDate = startDate.year(start.year()).subtract(1, "years");
              endDate = endDate.year(start.year()).subtract(1, "years").add(offset, "years");
              runUntil.add(1, "years");
              break;
            default:
              console.log("Wrong repeat format, allowed are: daily, weekly, monthly, yearly. Given:", _repeatInstanceProperty(hiddenDates[i]));
              return;
          }
          while (startDate < runUntil) {
            body.hiddenDates.push({
              start: startDate.valueOf(),
              end: endDate.valueOf()
            });
            switch (_repeatInstanceProperty(hiddenDates[i])) {
              case "daily":
                startDate = startDate.add(1, "days");
                endDate = endDate.add(1, "days");
                break;
              case "weekly":
                startDate = startDate.add(1, "weeks");
                endDate = endDate.add(1, "weeks");
                break;
              case "monthly":
                startDate = startDate.add(1, "months");
                endDate = endDate.add(1, "months");
                break;
              case "yearly":
                startDate = startDate.add(1, "y");
                endDate = endDate.add(1, "y");
                break;
              default:
                console.log("Wrong repeat format, allowed are: daily, weekly, monthly, yearly. Given:", _repeatInstanceProperty(hiddenDates[i]));
                return;
            }
          }
          body.hiddenDates.push({
            start: startDate.valueOf(),
            end: endDate.valueOf()
          });
        }
      }
    }
    // remove duplicates, merge where possible
    removeDuplicates(body);
    // ensure the new positions are not on hidden dates
    const startHidden = getIsHidden(body.range.start, body.hiddenDates);
    const endHidden = getIsHidden(body.range.end, body.hiddenDates);
    let rangeStart = body.range.start;
    let rangeEnd = body.range.end;
    if (startHidden.hidden == true) {
      rangeStart = body.range.startToFront == true ? startHidden.startDate - 1 : startHidden.endDate + 1;
    }
    if (endHidden.hidden == true) {
      rangeEnd = body.range.endToFront == true ? endHidden.startDate - 1 : endHidden.endDate + 1;
    }
    if (startHidden.hidden == true || endHidden.hidden == true) {
      body.range._applyRange(rangeStart, rangeEnd);
    }
  }
}

/**
 * remove duplicates from the hidden dates list. Duplicates are evil. They mess everything up.
 * Scales with N^2
 *
 * @param {Object} body
 */
function removeDuplicates(body) {
  var _context2;
  const hiddenDates = body.hiddenDates;
  const safeDates = [];
  for (var i = 0; i < hiddenDates.length; i++) {
    for (let j = 0; j < hiddenDates.length; j++) {
      if (i != j && hiddenDates[j].remove != true && hiddenDates[i].remove != true) {
        // j inside i
        if (hiddenDates[j].start >= hiddenDates[i].start && hiddenDates[j].end <= hiddenDates[i].end) {
          hiddenDates[j].remove = true;
        }
        // j start inside i
        else if (hiddenDates[j].start >= hiddenDates[i].start && hiddenDates[j].start <= hiddenDates[i].end) {
          hiddenDates[i].end = hiddenDates[j].end;
          hiddenDates[j].remove = true;
        }
        // j end inside i
        else if (hiddenDates[j].end >= hiddenDates[i].start && hiddenDates[j].end <= hiddenDates[i].end) {
          hiddenDates[i].start = hiddenDates[j].start;
          hiddenDates[j].remove = true;
        }
      }
    }
  }
  for (i = 0; i < hiddenDates.length; i++) {
    if (hiddenDates[i].remove !== true) {
      safeDates.push(hiddenDates[i]);
    }
  }
  body.hiddenDates = safeDates;
  _sortInstanceProperty(_context2 = body.hiddenDates).call(_context2, (a, b) => a.start - b.start); // sort by start time
}

/**
 * Prints dates to console
 * @param {array} dates
 */
function printDates(dates) {
  for (let i = 0; i < dates.length; i++) {
    console.log(i, new Date(dates[i].start), new Date(dates[i].end), dates[i].start, dates[i].end, dates[i].remove);
  }
}

/**
 * Used in TimeStep to avoid the hidden times.
 * @param {function} moment
 * @param {TimeStep} timeStep
 * @param {Date} previousTime
 */
function stepOverHiddenDates(moment, timeStep, previousTime) {
  let stepInHidden = false;
  const currentValue = timeStep.current.valueOf();
  for (let i = 0; i < timeStep.hiddenDates.length; i++) {
    const startDate = timeStep.hiddenDates[i].start;
    var endDate = timeStep.hiddenDates[i].end;
    if (currentValue >= startDate && currentValue < endDate) {
      stepInHidden = true;
      break;
    }
  }
  if (stepInHidden == true && currentValue < timeStep._end.valueOf() && currentValue != previousTime) {
    const prevValue = moment(previousTime);
    const newValue = moment(endDate);
    //check if the next step should be major
    if (prevValue.year() != newValue.year()) {
      timeStep.switchedYear = true;
    } else if (prevValue.month() != newValue.month()) {
      timeStep.switchedMonth = true;
    } else if (prevValue.dayOfYear() != newValue.dayOfYear()) {
      timeStep.switchedDay = true;
    }
    timeStep.current = newValue;
  }
}

///**
// * Used in TimeStep to avoid the hidden times.
// * @param timeStep
// * @param previousTime
// */
//checkFirstStep = function(timeStep) {
//  var stepInHidden = false;
//  var currentValue = timeStep.current.valueOf();
//  for (var i = 0; i < timeStep.hiddenDates.length; i++) {
//    var startDate = timeStep.hiddenDates[i].start;
//    var endDate = timeStep.hiddenDates[i].end;
//    if (currentValue >= startDate && currentValue < endDate) {
//      stepInHidden = true;
//      break;
//    }
//  }
//
//  if (stepInHidden == true && currentValue <= timeStep._end.valueOf()) {
//    var newValue = moment(endDate);
//    timeStep.current = newValue.toDate();
//  }
//};

/**
 * replaces the Core toScreen methods
 *
 * @param {timeline.Core} Core
 * @param {Date} time
 * @param {number} width
 * @returns {number}
 */
function toScreen(Core, time, width) {
  let conversion;
  if (Core.body.hiddenDates.length == 0) {
    conversion = Core.range.conversion(width);
    return (time.valueOf() - conversion.offset) * conversion.scale;
  } else {
    const hidden = getIsHidden(time, Core.body.hiddenDates);
    if (hidden.hidden == true) {
      time = hidden.startDate;
    }
    const duration = getHiddenDurationBetween(Core.body.hiddenDates, Core.range.start, Core.range.end);
    if (time < Core.range.start) {
      conversion = Core.range.conversion(width, duration);
      const hiddenBeforeStart = getHiddenDurationBeforeStart(Core.body.hiddenDates, time, conversion.offset);
      time = Core.options.moment(time).toDate().valueOf();
      time = time + hiddenBeforeStart;
      return -(conversion.offset - time.valueOf()) * conversion.scale;
    } else if (time > Core.range.end) {
      const rangeAfterEnd = {
        start: Core.range.start,
        end: time
      };
      time = correctTimeForHidden(Core.options.moment, Core.body.hiddenDates, rangeAfterEnd, time);
      conversion = Core.range.conversion(width, duration);
      return (time.valueOf() - conversion.offset) * conversion.scale;
    } else {
      time = correctTimeForHidden(Core.options.moment, Core.body.hiddenDates, Core.range, time);
      conversion = Core.range.conversion(width, duration);
      return (time.valueOf() - conversion.offset) * conversion.scale;
    }
  }
}

/**
 * Replaces the core toTime methods
 *
 * @param {timeline.Core} Core
 * @param {number} x
 * @param {number} width
 * @returns {Date}
 */
function toTime(Core, x, width) {
  if (Core.body.hiddenDates.length == 0) {
    const conversion = Core.range.conversion(width);
    return new Date(x / conversion.scale + conversion.offset);
  } else {
    const hiddenDuration = getHiddenDurationBetween(Core.body.hiddenDates, Core.range.start, Core.range.end);
    const totalDuration = Core.range.end - Core.range.start - hiddenDuration;
    const partialDuration = totalDuration * x / width;
    const accumulatedHiddenDuration = getAccumulatedHiddenDuration(Core.body.hiddenDates, Core.range, partialDuration);
    return new Date(accumulatedHiddenDuration + partialDuration + Core.range.start);
  }
}

/**
 * Support function
 *
 * @param {Array.<{start: Window.start, end: *}>} hiddenDates
 * @param {number} start
 * @param {number} end
 * @returns {number}
 */
function getHiddenDurationBetween(hiddenDates, start, end) {
  let duration = 0;
  for (let i = 0; i < hiddenDates.length; i++) {
    const startDate = hiddenDates[i].start;
    const endDate = hiddenDates[i].end;
    // if time after the cutout, and the
    if (startDate >= start && endDate < end) {
      duration += endDate - startDate;
    }
  }
  return duration;
}

/**
 * Support function
 *
 * @param {Array.<{start: Window.start, end: *}>} hiddenDates
 * @param {number} start
 * @param {number} end
 * @returns {number}
 */
function getHiddenDurationBeforeStart(hiddenDates, start, end) {
  let duration = 0;
  for (let i = 0; i < hiddenDates.length; i++) {
    const startDate = hiddenDates[i].start;
    const endDate = hiddenDates[i].end;
    if (startDate >= start && endDate <= end) {
      duration += endDate - startDate;
    }
  }
  return duration;
}

/**
 * Support function
 * @param {function} moment
 * @param {Array.<{start: Window.start, end: *}>} hiddenDates
 * @param {{start: number, end: number}} range
 * @param {Date} time
 * @returns {number}
 */
function correctTimeForHidden(moment, hiddenDates, range, time) {
  time = moment(time).toDate().valueOf();
  time -= getHiddenDurationBefore(moment, hiddenDates, range, time);
  return time;
}

/**
 * Support function
 * @param {function} moment
 * @param {Array.<{start: Window.start, end: *}>} hiddenDates
 * @param {{start: number, end: number}} range
 * @param {Date} time
 * @returns {number}
 */
function getHiddenDurationBefore(moment, hiddenDates, range, time) {
  let timeOffset = 0;
  time = moment(time).toDate().valueOf();
  for (let i = 0; i < hiddenDates.length; i++) {
    const startDate = hiddenDates[i].start;
    const endDate = hiddenDates[i].end;
    // if time after the cutout, and the
    if (startDate >= range.start && endDate < range.end) {
      if (time >= endDate) {
        timeOffset += endDate - startDate;
      }
    }
  }
  return timeOffset;
}

/**
 * sum the duration from start to finish, including the hidden duration,
 * until the required amount has been reached, return the accumulated hidden duration
 * @param {Array.<{start: Window.start, end: *}>} hiddenDates
 * @param {{start: number, end: number}} range
 * @param {number} [requiredDuration=0]
 * @returns {number}
 */
function getAccumulatedHiddenDuration(hiddenDates, range, requiredDuration) {
  let hiddenDuration = 0;
  let duration = 0;
  let previousPoint = range.start;
  //printDates(hiddenDates)
  for (let i = 0; i < hiddenDates.length; i++) {
    const startDate = hiddenDates[i].start;
    const endDate = hiddenDates[i].end;
    // if time after the cutout, and the
    if (startDate >= range.start && endDate < range.end) {
      duration += startDate - previousPoint;
      previousPoint = endDate;
      if (duration >= requiredDuration) {
        break;
      } else {
        hiddenDuration += endDate - startDate;
      }
    }
  }
  return hiddenDuration;
}

/**
 * used to step over to either side of a hidden block. Correction is disabled on tablets, might be set to true
 * @param {Array.<{start: Window.start, end: *}>} hiddenDates
 * @param {Date} time
 * @param {number} direction
 * @param {boolean} correctionEnabled
 * @returns {Date|number}
 */
function snapAwayFromHidden(hiddenDates, time, direction, correctionEnabled) {
  const isHidden = getIsHidden(time, hiddenDates);
  if (isHidden.hidden == true) {
    if (direction < 0) {
      if (correctionEnabled == true) {
        return isHidden.startDate - (isHidden.endDate - time) - 1;
      } else {
        return isHidden.startDate - 1;
      }
    } else {
      if (correctionEnabled == true) {
        return isHidden.endDate + (time - isHidden.startDate) + 1;
      } else {
        return isHidden.endDate + 1;
      }
    }
  } else {
    return time;
  }
}

/**
 * Check if a time is hidden
 *
 * @param {Date} time
 * @param {Array.<{start: Window.start, end: *}>} hiddenDates
 * @returns {{hidden: boolean, startDate: Window.start, endDate: *}}
 */
function getIsHidden(time, hiddenDates) {
  for (let i = 0; i < hiddenDates.length; i++) {
    var startDate = hiddenDates[i].start;
    var endDate = hiddenDates[i].end;
    if (time >= startDate && time < endDate) {
      // if the start is entering a hidden zone
      return {
        hidden: true,
        startDate,
        endDate
      };
    }
  }
  return {
    hidden: false,
    startDate,
    endDate
  };
}

var DateUtil = /*#__PURE__*/Object.freeze({
	__proto__: null,
	convertHiddenOptions: convertHiddenOptions,
	correctTimeForHidden: correctTimeForHidden,
	getAccumulatedHiddenDuration: getAccumulatedHiddenDuration,
	getHiddenDurationBefore: getHiddenDurationBefore,
	getHiddenDurationBeforeStart: getHiddenDurationBeforeStart,
	getHiddenDurationBetween: getHiddenDurationBetween,
	getIsHidden: getIsHidden,
	printDates: printDates,
	removeDuplicates: removeDuplicates,
	snapAwayFromHidden: snapAwayFromHidden,
	stepOverHiddenDates: stepOverHiddenDates,
	toScreen: toScreen,
	toTime: toTime,
	updateHiddenDates: updateHiddenDates
});

/**
 * A Range controls a numeric range with a start and end value.
 * The Range adjusts the range based on mouse events or programmatic changes,
 * and triggers events when the range is changing or has been changed.
 */
class Range extends Component {
  /**
   * @param {{dom: Object, domProps: Object, emitter: Emitter}} body
   * @param {Object} [options]    See description at Range.setOptions
   * @constructor Range
   * @extends Component
   */
  constructor(body, options) {
    var _context, _context2, _context3, _context4, _context5, _context6, _context7;
    super();
    const now = moment$2().hours(0).minutes(0).seconds(0).milliseconds(0);
    const start = now.clone().add(-3, "days").valueOf();
    const end = now.clone().add(3, "days").valueOf();
    this.millisecondsPerPixelCache = undefined;
    if (options === undefined) {
      this.start = start;
      this.end = end;
    } else {
      this.start = options.start || start;
      this.end = options.end || end;
    }
    this.rolling = false;
    this.body = body;
    this.deltaDifference = 0;
    this.scaleOffset = 0;
    this.startToFront = false;
    this.endToFront = true;

    // default options
    this.defaultOptions = {
      rtl: false,
      start: null,
      end: null,
      moment: moment$2,
      direction: "horizontal",
      // 'horizontal' or 'vertical'
      moveable: true,
      zoomable: true,
      min: null,
      max: null,
      zoomMin: 10,
      // milliseconds
      zoomMax: 1000 * 60 * 60 * 24 * 365 * 10000,
      // milliseconds
      rollingMode: {
        follow: false,
        offset: 0.5
      }
    };
    this.options = availableUtils.extend({}, this.defaultOptions);
    this.props = {
      touch: {}
    };
    this.animationTimer = null;

    // drag listeners for dragging
    this.body.emitter.on("panstart", _bindInstanceProperty(_context = this._onDragStart).call(_context, this));
    this.body.emitter.on("panmove", _bindInstanceProperty(_context2 = this._onDrag).call(_context2, this));
    this.body.emitter.on("panend", _bindInstanceProperty(_context3 = this._onDragEnd).call(_context3, this));

    // mouse wheel for zooming
    this.body.emitter.on("mousewheel", _bindInstanceProperty(_context4 = this._onMouseWheel).call(_context4, this));

    // pinch to zoom
    this.body.emitter.on("touch", _bindInstanceProperty(_context5 = this._onTouch).call(_context5, this));
    this.body.emitter.on("pinch", _bindInstanceProperty(_context6 = this._onPinch).call(_context6, this));

    // on click of rolling mode button
    this.body.dom.rollingModeBtn.addEventListener("click", _bindInstanceProperty(_context7 = this.startRolling).call(_context7, this));
    this.setOptions(options);
  }

  /**
   * Set options for the range controller
   * @param {Object} options      Available options:
   *                              {number | Date | String} start  Start date for the range
   *                              {number | Date | String} end    End date for the range
   *                              {number} min    Minimum value for start
   *                              {number} max    Maximum value for end
   *                              {number} zoomMin    Set a minimum value for
   *                                                  (end - start).
   *                              {number} zoomMax    Set a maximum value for
   *                                                  (end - start).
   *                              {boolean} moveable Enable moving of the range
   *                                                 by dragging. True by default
   *                              {boolean} zoomable Enable zooming of the range
   *                                                 by pinching/scrolling. True by default
   */
  setOptions(options) {
    if (options) {
      // copy the options that we know
      const fields = ["animation", "direction", "min", "max", "zoomMin", "zoomMax", "moveable", "zoomable", "moment", "activate", "hiddenDates", "zoomKey", "zoomFriction", "rtl", "showCurrentTime", "rollingMode", "horizontalScroll", "horizontalScrollKey", "horizontalScrollInvert", "verticalScroll"];
      availableUtils.selectiveExtend(fields, this.options, options);
      if (options.rollingMode && options.rollingMode.follow) {
        this.startRolling();
      }
      if ("start" in options || "end" in options) {
        // apply a new range. both start and end are optional
        this.setRange(options.start, options.end);
      }
    }
  }

  /**
   * Start auto refreshing the current time bar
   */
  startRolling() {
    const me = this;

    /**
     *  Updates the current time.
     */
    function update() {
      me.stopRolling();
      me.rolling = true;
      let interval = me.end - me.start;
      const t = availableUtils.convert(new Date(), "Date").valueOf();
      const rollingModeOffset = me.options.rollingMode && me.options.rollingMode.offset || 0.5;
      const start = t - interval * rollingModeOffset;
      const end = t + interval * (1 - rollingModeOffset);
      const options = {
        animation: false
      };
      me.setRange(start, end, options);

      // determine interval to refresh
      const scale = me.conversion(me.body.domProps.center.width).scale;
      interval = 1 / scale / 10;
      if (interval < 30) interval = 30;
      if (interval > 1000) interval = 1000;
      me.body.dom.rollingModeBtn.style.visibility = "hidden";
      // start a renderTimer to adjust for the new time
      me.currentTimeTimer = _setTimeout(update, interval);
    }
    update();
  }

  /**
   * Stop auto refreshing the current time bar
   */
  stopRolling() {
    if (this.currentTimeTimer !== undefined) {
      clearTimeout(this.currentTimeTimer);
      this.rolling = false;
      this.body.dom.rollingModeBtn.style.visibility = "visible";
    }
  }

  /**
   * Set a new start and end range
   * @param {Date | number | string} start
   * @param {Date | number | string} end
   * @param {Object} options      Available options:
   *                              {boolean | {duration: number, easingFunction: string}} [animation=false]
   *                                    If true, the range is animated
   *                                    smoothly to the new window. An object can be
   *                                    provided to specify duration and easing function.
   *                                    Default duration is 500 ms, and default easing
   *                                    function is 'easeInOutQuad'.
   *                              {boolean} [byUser=false]
   *                              {Event}  event  Mouse event
   * @param {Function} callback     a callback function to be executed at the end of this function
   * @param {Function} frameCallback    a callback function executed each frame of the range animation.
   *                                    The callback will be passed three parameters:
   *                                    {number} easeCoefficient    an easing coefficent
   *                                    {boolean} willDraw          If true the caller will redraw after the callback completes
   *                                    {boolean} done              If true then animation is ending after the current frame
   * @return {void}
   */
  setRange(start, end, options, callback, frameCallback) {
    if (!options) {
      options = {};
    }
    if (options.byUser !== true) {
      options.byUser = false;
    }
    const me = this;
    const finalStart = start != undefined ? availableUtils.convert(start, "Date").valueOf() : null;
    const finalEnd = end != undefined ? availableUtils.convert(end, "Date").valueOf() : null;
    this._cancelAnimation();
    this.millisecondsPerPixelCache = undefined;
    if (options.animation) {
      // true or an Object
      const initStart = this.start;
      const initEnd = this.end;
      const duration = typeof options.animation === "object" && "duration" in options.animation ? options.animation.duration : 500;
      const easingName = typeof options.animation === "object" && "easingFunction" in options.animation ? options.animation.easingFunction : "easeInOutQuad";
      const easingFunction = availableUtils.easingFunctions[easingName];
      if (!easingFunction) {
        var _context8;
        throw new Error(_concatInstanceProperty(_context8 = "Unknown easing function ".concat(_JSON$stringify(easingName), ". Choose from: ")).call(_context8, _Object$keys(availableUtils.easingFunctions).join(", ")));
      }
      const initTime = _Date$now();
      let anyChanged = false;
      const next = () => {
        if (!me.props.touch.dragging) {
          const now = _Date$now();
          const time = now - initTime;
          const ease = easingFunction(time / duration);
          const done = time > duration;
          const s = done || finalStart === null ? finalStart : initStart + (finalStart - initStart) * ease;
          const e = done || finalEnd === null ? finalEnd : initEnd + (finalEnd - initEnd) * ease;
          changed = me._applyRange(s, e);
          updateHiddenDates(me.options.moment, me.body, me.options.hiddenDates);
          anyChanged = anyChanged || changed;
          const params = {
            start: new Date(me.start),
            end: new Date(me.end),
            byUser: options.byUser,
            event: options.event
          };
          if (frameCallback) {
            frameCallback(ease, changed, done);
          }
          if (changed) {
            me.body.emitter.emit("rangechange", params);
          }
          if (done) {
            if (anyChanged) {
              me.body.emitter.emit("rangechanged", params);
              if (callback) {
                return callback();
              }
            }
          } else {
            // animate with as high as possible frame rate, leave 20 ms in between
            // each to prevent the browser from blocking
            me.animationTimer = _setTimeout(next, 20);
          }
        }
      };
      return next();
    } else {
      var changed = this._applyRange(finalStart, finalEnd);
      updateHiddenDates(this.options.moment, this.body, this.options.hiddenDates);
      if (changed) {
        const params = {
          start: new Date(this.start),
          end: new Date(this.end),
          byUser: options.byUser,
          event: options.event
        };
        this.body.emitter.emit("rangechange", params);
        clearTimeout(me.timeoutID);
        me.timeoutID = _setTimeout(() => {
          me.body.emitter.emit("rangechanged", params);
        }, 200);
        if (callback) {
          return callback();
        }
      }
    }
  }

  /**
   * Get the number of milliseconds per pixel.
   *
   * @returns {undefined|number}
   */
  getMillisecondsPerPixel() {
    if (this.millisecondsPerPixelCache === undefined) {
      this.millisecondsPerPixelCache = (this.end - this.start) / this.body.dom.center.clientWidth;
    }
    return this.millisecondsPerPixelCache;
  }

  /**
   * Stop an animation
   * @private
   */
  _cancelAnimation() {
    if (this.animationTimer) {
      clearTimeout(this.animationTimer);
      this.animationTimer = null;
    }
  }

  /**
   * Set a new start and end range. This method is the same as setRange, but
   * does not trigger a range change and range changed event, and it returns
   * true when the range is changed
   * @param {number} [start]
   * @param {number} [end]
   * @return {boolean} changed
   * @private
   */
  _applyRange(start, end) {
    let newStart = start != null ? availableUtils.convert(start, "Date").valueOf() : this.start;
    let newEnd = end != null ? availableUtils.convert(end, "Date").valueOf() : this.end;
    const max = this.options.max != null ? availableUtils.convert(this.options.max, "Date").valueOf() : null;
    const min = this.options.min != null ? availableUtils.convert(this.options.min, "Date").valueOf() : null;
    let diff;

    // check for valid number
    if (isNaN(newStart) || newStart === null) {
      throw new Error("Invalid start \"".concat(start, "\""));
    }
    if (isNaN(newEnd) || newEnd === null) {
      throw new Error("Invalid end \"".concat(end, "\""));
    }

    // prevent end < start
    if (newEnd < newStart) {
      newEnd = newStart;
    }

    // prevent start < min
    if (min !== null) {
      if (newStart < min) {
        diff = min - newStart;
        newStart += diff;
        newEnd += diff;

        // prevent end > max
        if (max != null) {
          if (newEnd > max) {
            newEnd = max;
          }
        }
      }
    }

    // prevent end > max
    if (max !== null) {
      if (newEnd > max) {
        diff = newEnd - max;
        newStart -= diff;
        newEnd -= diff;

        // prevent start < min
        if (min != null) {
          if (newStart < min) {
            newStart = min;
          }
        }
      }
    }

    // prevent (end-start) < zoomMin
    if (this.options.zoomMin !== null) {
      let zoomMin = _parseFloat(this.options.zoomMin);
      if (zoomMin < 0) {
        zoomMin = 0;
      }
      if (newEnd - newStart < zoomMin) {
        // compensate for a scale of 0.5 ms
        const compensation = 0.5;
        if (this.end - this.start === zoomMin && newStart >= this.start - compensation && newEnd <= this.end) {
          // ignore this action, we are already zoomed to the minimum
          newStart = this.start;
          newEnd = this.end;
        } else {
          // zoom to the minimum
          diff = zoomMin - (newEnd - newStart);
          newStart -= diff / 2;
          newEnd += diff / 2;
        }
      }
    }

    // prevent (end-start) > zoomMax
    if (this.options.zoomMax !== null) {
      let zoomMax = _parseFloat(this.options.zoomMax);
      if (zoomMax < 0) {
        zoomMax = 0;
      }
      if (newEnd - newStart > zoomMax) {
        if (this.end - this.start === zoomMax && newStart < this.start && newEnd > this.end) {
          // ignore this action, we are already zoomed to the maximum
          newStart = this.start;
          newEnd = this.end;
        } else {
          // zoom to the maximum
          diff = newEnd - newStart - zoomMax;
          newStart += diff / 2;
          newEnd -= diff / 2;
        }
      }
    }
    const changed = this.start != newStart || this.end != newEnd;

    // if the new range does NOT overlap with the old range, emit checkRangedItems to avoid not showing ranged items (ranged meaning has end time, not necessarily of type Range)
    if (!(newStart >= this.start && newStart <= this.end || newEnd >= this.start && newEnd <= this.end) && !(this.start >= newStart && this.start <= newEnd || this.end >= newStart && this.end <= newEnd)) {
      this.body.emitter.emit("checkRangedItems");
    }
    this.start = newStart;
    this.end = newEnd;
    return changed;
  }

  /**
   * Retrieve the current range.
   * @return {Object} An object with start and end properties
   */
  getRange() {
    return {
      start: this.start,
      end: this.end
    };
  }

  /**
   * Calculate the conversion offset and scale for current range, based on
   * the provided width
   * @param {number} width
   * @param {number} [totalHidden=0]
   * @returns {{offset: number, scale: number}} conversion
   */
  conversion(width, totalHidden) {
    return Range.conversion(this.start, this.end, width, totalHidden);
  }

  /**
   * Static method to calculate the conversion offset and scale for a range,
   * based on the provided start, end, and width
   * @param {number} start
   * @param {number} end
   * @param {number} width
   * @param {number} [totalHidden=0]
   * @returns {{offset: number, scale: number}} conversion
   */
  static conversion(start, end, width, totalHidden) {
    if (totalHidden === undefined) {
      totalHidden = 0;
    }
    if (width != 0 && end - start != 0) {
      return {
        offset: start,
        scale: width / (end - start - totalHidden)
      };
    } else {
      return {
        offset: 0,
        scale: 1
      };
    }
  }

  /**
   * Start dragging horizontally or vertically
   * @param {Event} event
   * @private
   */
  _onDragStart(event) {
    this.deltaDifference = 0;
    this.previousDelta = 0;

    // only allow dragging when configured as movable
    if (!this.options.moveable) return;

    // only start dragging when the mouse is inside the current range
    if (!this._isInsideRange(event)) return;

    // refuse to drag when we where pinching to prevent the timeline make a jump
    // when releasing the fingers in opposite order from the touch screen
    if (!this.props.touch.allowDragging) return;
    this.stopRolling();
    this.props.touch.start = this.start;
    this.props.touch.end = this.end;
    this.props.touch.dragging = true;
    if (this.body.dom.root) {
      this.body.dom.root.style.cursor = "move";
    }
  }

  /**
   * Perform dragging operation
   * @param {Event} event
   * @private
   */
  _onDrag(event) {
    if (!event) return;
    if (!this.props.touch.dragging) return;

    // only allow dragging when configured as movable
    if (!this.options.moveable) return;

    // TODO: this may be redundant in hammerjs2
    // refuse to drag when we where pinching to prevent the timeline make a jump
    // when releasing the fingers in opposite order from the touch screen
    if (!this.props.touch.allowDragging) return;
    const direction = this.options.direction;
    validateDirection(direction);
    let delta = direction == "horizontal" ? event.deltaX : event.deltaY;
    delta -= this.deltaDifference;
    let interval = this.props.touch.end - this.props.touch.start;

    // normalize dragging speed if cutout is in between.
    const duration = getHiddenDurationBetween(this.body.hiddenDates, this.start, this.end);
    interval -= duration;
    const width = direction == "horizontal" ? this.body.domProps.center.width : this.body.domProps.center.height;
    let diffRange;
    if (this.options.rtl) {
      diffRange = delta / width * interval;
    } else {
      diffRange = -delta / width * interval;
    }
    const newStart = this.props.touch.start + diffRange;
    const newEnd = this.props.touch.end + diffRange;

    // snapping times away from hidden zones
    const safeStart = snapAwayFromHidden(this.body.hiddenDates, newStart, this.previousDelta - delta, true);
    const safeEnd = snapAwayFromHidden(this.body.hiddenDates, newEnd, this.previousDelta - delta, true);
    if (safeStart != newStart || safeEnd != newEnd) {
      this.deltaDifference += delta;
      this.props.touch.start = safeStart;
      this.props.touch.end = safeEnd;
      this._onDrag(event);
      return;
    }
    this.previousDelta = delta;
    this._applyRange(newStart, newEnd);
    const startDate = new Date(this.start);
    const endDate = new Date(this.end);

    // fire a rangechange event
    this.body.emitter.emit("rangechange", {
      start: startDate,
      end: endDate,
      byUser: true,
      event
    });

    // fire a panmove event
    this.body.emitter.emit("panmove");
  }

  /**
   * Stop dragging operation
   * @param {event} event
   * @private
   */
  _onDragEnd(event) {
    if (!this.props.touch.dragging) return;

    // only allow dragging when configured as movable
    if (!this.options.moveable) return;

    // TODO: this may be redundant in hammerjs2
    // refuse to drag when we where pinching to prevent the timeline make a jump
    // when releasing the fingers in opposite order from the touch screen
    if (!this.props.touch.allowDragging) return;
    this.props.touch.dragging = false;
    if (this.body.dom.root) {
      this.body.dom.root.style.cursor = "auto";
    }

    // fire a rangechanged event
    this.body.emitter.emit("rangechanged", {
      start: new Date(this.start),
      end: new Date(this.end),
      byUser: true,
      event
    });
  }

  /**
   * Event handler for mouse wheel event, used to zoom
   * Code from http://adomas.org/javascript-mouse-wheel/
   * @param {Event} event
   * @private
   */
  _onMouseWheel(event) {
    // retrieve delta
    let delta = 0;
    if (event.wheelDelta) {
      /* IE/Opera. */
      delta = event.wheelDelta / 120;
    } else if (event.detail) {
      /* Mozilla case. */
      // In Mozilla, sign of delta is different than in IE.
      // Also, delta is multiple of 3.
      delta = -event.detail / 3;
    } else if (event.deltaY) {
      delta = -event.deltaY / 3;
    }

    // don't allow zoom when the according key is pressed and the zoomKey option or not zoomable but movable
    if (this.options.zoomKey && !event[this.options.zoomKey] && this.options.zoomable || !this.options.zoomable && this.options.moveable) {
      return;
    }

    // only allow zooming when configured as zoomable and moveable
    if (!(this.options.zoomable && this.options.moveable)) return;

    // only zoom when the mouse is inside the current range
    if (!this._isInsideRange(event)) return;

    // If delta is nonzero, handle it.
    // Basically, delta is now positive if wheel was scrolled up,
    // and negative, if wheel was scrolled down.
    if (delta) {
      // perform the zoom action. Delta is normally 1 or -1

      // adjust a negative delta such that zooming in with delta 0.1
      // equals zooming out with a delta -0.1

      const zoomFriction = this.options.zoomFriction || 5;
      let scale;
      if (delta < 0) {
        scale = 1 - delta / zoomFriction;
      } else {
        scale = 1 / (1 + delta / zoomFriction);
      }

      // calculate center, the date to zoom around
      let pointerDate;
      if (this.rolling) {
        const rollingModeOffset = this.options.rollingMode && this.options.rollingMode.offset || 0.5;
        pointerDate = this.start + (this.end - this.start) * rollingModeOffset;
      } else {
        const pointer = this.getPointer({
          x: event.clientX,
          y: event.clientY
        }, this.body.dom.center);
        pointerDate = this._pointerToDate(pointer);
      }
      this.zoom(scale, pointerDate, delta, event);

      // Prevent default actions caused by mouse wheel
      // (else the page and timeline both scroll)
      event.preventDefault();
    }
  }

  /**
   * Start of a touch gesture
   * @param {Event} event
   * @private
   */
  _onTouch(event) {
    // eslint-disable-line no-unused-vars
    this.props.touch.start = this.start;
    this.props.touch.end = this.end;
    this.props.touch.allowDragging = true;
    this.props.touch.center = null;
    this.props.touch.centerDate = null;
    this.scaleOffset = 0;
    this.deltaDifference = 0;
    // Disable the browser default handling of this event.
    availableUtils.preventDefault(event);
  }

  /**
   * Handle pinch event
   * @param {Event} event
   * @private
   */
  _onPinch(event) {
    // only allow zooming when configured as zoomable and moveable
    if (!(this.options.zoomable && this.options.moveable)) return;

    // Disable the browser default handling of this event.
    availableUtils.preventDefault(event);
    this.props.touch.allowDragging = false;
    if (!this.props.touch.center) {
      this.props.touch.center = this.getPointer(event.center, this.body.dom.center);
      this.props.touch.centerDate = this._pointerToDate(this.props.touch.center);
    }
    this.stopRolling();
    const scale = 1 / (event.scale + this.scaleOffset);
    const centerDate = this.props.touch.centerDate;
    const hiddenDuration = getHiddenDurationBetween(this.body.hiddenDates, this.start, this.end);
    const hiddenDurationBefore = getHiddenDurationBefore(this.options.moment, this.body.hiddenDates, this, centerDate);
    const hiddenDurationAfter = hiddenDuration - hiddenDurationBefore;

    // calculate new start and end
    let newStart = centerDate - hiddenDurationBefore + (this.props.touch.start - (centerDate - hiddenDurationBefore)) * scale;
    let newEnd = centerDate + hiddenDurationAfter + (this.props.touch.end - (centerDate + hiddenDurationAfter)) * scale;

    // snapping times away from hidden zones
    this.startToFront = 1 - scale <= 0; // used to do the right auto correction with periodic hidden times
    this.endToFront = scale - 1 <= 0; // used to do the right auto correction with periodic hidden times

    const safeStart = snapAwayFromHidden(this.body.hiddenDates, newStart, 1 - scale, true);
    const safeEnd = snapAwayFromHidden(this.body.hiddenDates, newEnd, scale - 1, true);
    if (safeStart != newStart || safeEnd != newEnd) {
      this.props.touch.start = safeStart;
      this.props.touch.end = safeEnd;
      this.scaleOffset = 1 - event.scale;
      newStart = safeStart;
      newEnd = safeEnd;
    }
    const options = {
      animation: false,
      byUser: true,
      event
    };
    this.setRange(newStart, newEnd, options);
    this.startToFront = false; // revert to default
    this.endToFront = true; // revert to default
  }

  /**
   * Test whether the mouse from a mouse event is inside the visible window,
   * between the current start and end date
   * @param {Object} event
   * @return {boolean} Returns true when inside the visible window
   * @private
   */
  _isInsideRange(event) {
    // calculate the time where the mouse is, check whether inside
    // and no scroll action should happen.
    const clientX = event.center ? event.center.x : event.clientX;
    const centerContainerRect = this.body.dom.centerContainer.getBoundingClientRect();
    const x = this.options.rtl ? clientX - centerContainerRect.left : centerContainerRect.right - clientX;
    const time = this.body.util.toTime(x);
    return time >= this.start && time <= this.end;
  }

  /**
   * Helper function to calculate the center date for zooming
   * @param {{x: number, y: number}} pointer
   * @return {number} date
   * @private
   */
  _pointerToDate(pointer) {
    let conversion;
    const direction = this.options.direction;
    validateDirection(direction);
    if (direction == "horizontal") {
      return this.body.util.toTime(pointer.x).valueOf();
    } else {
      const height = this.body.domProps.center.height;
      conversion = this.conversion(height);
      return pointer.y / conversion.scale + conversion.offset;
    }
  }

  /**
   * Get the pointer location relative to the location of the dom element
   * @param {{x: number, y: number}} touch
   * @param {Element} element   HTML DOM element
   * @return {{x: number, y: number}} pointer
   * @private
   */
  getPointer(touch, element) {
    const elementRect = element.getBoundingClientRect();
    if (this.options.rtl) {
      return {
        x: elementRect.right - touch.x,
        y: touch.y - elementRect.top
      };
    } else {
      return {
        x: touch.x - elementRect.left,
        y: touch.y - elementRect.top
      };
    }
  }

  /**
   * Zoom the range the given scale in or out. Start and end date will
   * be adjusted, and the timeline will be redrawn. You can optionally give a
   * date around which to zoom.
   * For example, try scale = 0.9 or 1.1
   * @param {number} scale      Scaling factor. Values above 1 will zoom out,
   *                            values below 1 will zoom in.
   * @param {number} [center]   Value representing a date around which will
   *                            be zoomed.
   * @param {number} delta
   * @param {Event} event
   */
  zoom(scale, center, delta, event) {
    // if centerDate is not provided, take it half between start Date and end Date
    if (center == null) {
      center = (this.start + this.end) / 2;
    }
    const hiddenDuration = getHiddenDurationBetween(this.body.hiddenDates, this.start, this.end);
    const hiddenDurationBefore = getHiddenDurationBefore(this.options.moment, this.body.hiddenDates, this, center);
    const hiddenDurationAfter = hiddenDuration - hiddenDurationBefore;

    // calculate new start and end
    let newStart = center - hiddenDurationBefore + (this.start - (center - hiddenDurationBefore)) * scale;
    let newEnd = center + hiddenDurationAfter + (this.end - (center + hiddenDurationAfter)) * scale;

    // snapping times away from hidden zones
    this.startToFront = delta > 0 ? false : true; // used to do the right autocorrection with periodic hidden times
    this.endToFront = -delta > 0 ? false : true; // used to do the right autocorrection with periodic hidden times
    const safeStart = snapAwayFromHidden(this.body.hiddenDates, newStart, delta, true);
    const safeEnd = snapAwayFromHidden(this.body.hiddenDates, newEnd, -delta, true);
    if (safeStart != newStart || safeEnd != newEnd) {
      newStart = safeStart;
      newEnd = safeEnd;
    }
    const options = {
      animation: false,
      byUser: true,
      event
    };
    this.setRange(newStart, newEnd, options);
    this.startToFront = false; // revert to default
    this.endToFront = true; // revert to default
  }

  /**
   * Move the range with a given delta to the left or right. Start and end
   * value will be adjusted. For example, try delta = 0.1 or -0.1
   * @param {number}  delta     Moving amount. Positive value will move right,
   *                            negative value will move left
   */
  move(delta) {
    // zoom start Date and end Date relative to the centerDate
    const diff = this.end - this.start;

    // apply new values
    const newStart = this.start + diff * delta;
    const newEnd = this.end + diff * delta;

    // TODO: reckon with min and max range

    this.start = newStart;
    this.end = newEnd;
  }

  /**
   * Move the range to a new center point
   * @param {number} moveTo      New center point of the range
   */
  moveTo(moveTo) {
    const center = (this.start + this.end) / 2;
    const diff = center - moveTo;

    // calculate new start and end
    const newStart = this.start - diff;
    const newEnd = this.end - diff;
    const options = {
      animation: false,
      byUser: true,
      event: null
    };
    this.setRange(newStart, newEnd, options);
  }

  /**
   * Destroy the Range
   */
  destroy() {
    this.stopRolling();
  }
}

/**
 * Test whether direction has a valid value
 * @param {string} direction    'horizontal' or 'vertical'
 */
function validateDirection(direction) {
  if (direction != "horizontal" && direction != "vertical") {
    throw new TypeError("Unknown direction \"".concat(direction, "\". Choose \"horizontal\" or \"vertical\"."));
  }
}

var es_array_some = {};

var hasRequiredEs_array_some;

function requireEs_array_some () {
	if (hasRequiredEs_array_some) return es_array_some;
	hasRequiredEs_array_some = 1;
	var $ = /*@__PURE__*/ require_export();
	var $some = /*@__PURE__*/ requireArrayIteration().some;
	var arrayMethodIsStrict = /*@__PURE__*/ requireArrayMethodIsStrict();

	var STRICT_METHOD = arrayMethodIsStrict('some');

	// `Array.prototype.some` method
	// https://tc39.es/ecma262/#sec-array.prototype.some
	$({ target: 'Array', proto: true, forced: !STRICT_METHOD }, {
	  some: function some(callbackfn /* , thisArg */) {
	    return $some(this, callbackfn, arguments.length > 1 ? arguments[1] : undefined);
	  }
	});
	return es_array_some;
}

var some$3;
var hasRequiredSome$3;

function requireSome$3 () {
	if (hasRequiredSome$3) return some$3;
	hasRequiredSome$3 = 1;
	requireEs_array_some();
	var getBuiltInPrototypeMethod = /*@__PURE__*/ requireGetBuiltInPrototypeMethod();

	some$3 = getBuiltInPrototypeMethod('Array', 'some');
	return some$3;
}

var some$2;
var hasRequiredSome$2;

function requireSome$2 () {
	if (hasRequiredSome$2) return some$2;
	hasRequiredSome$2 = 1;
	var isPrototypeOf = /*@__PURE__*/ requireObjectIsPrototypeOf();
	var method = /*@__PURE__*/ requireSome$3();

	var ArrayPrototype = Array.prototype;

	some$2 = function (it) {
	  var own = it.some;
	  return it === ArrayPrototype || (isPrototypeOf(ArrayPrototype, it) && own === ArrayPrototype.some) ? method : own;
	};
	return some$2;
}

var some$1;
var hasRequiredSome$1;

function requireSome$1 () {
	if (hasRequiredSome$1) return some$1;
	hasRequiredSome$1 = 1;
	var parent = /*@__PURE__*/ requireSome$2();

	some$1 = parent;
	return some$1;
}

var some;
var hasRequiredSome;

function requireSome () {
	if (hasRequiredSome) return some;
	hasRequiredSome = 1;
	some = /*@__PURE__*/ requireSome$1();
	return some;
}

var someExports = requireSome();
var _someInstanceProperty = /*@__PURE__*/getDefaultExportFromCjs(someExports);

var setInterval$1;
var hasRequiredSetInterval$1;

function requireSetInterval$1 () {
	if (hasRequiredSetInterval$1) return setInterval$1;
	hasRequiredSetInterval$1 = 1;
	requireWeb_timers();
	var path = /*@__PURE__*/ requirePath();

	setInterval$1 = path.setInterval;
	return setInterval$1;
}

var setInterval;
var hasRequiredSetInterval;

function requireSetInterval () {
	if (hasRequiredSetInterval) return setInterval;
	hasRequiredSetInterval = 1;
	setInterval = /*@__PURE__*/ requireSetInterval$1();
	return setInterval;
}

var setIntervalExports = requireSetInterval();
var _setInterval = /*@__PURE__*/getDefaultExportFromCjs(setIntervalExports);

var _firstTarget = null; // singleton, will contain the target element where the touch event started

/**
 * Extend an Hammer.js instance with event propagation.
 *
 * Features:
 * - Events emitted by hammer will propagate in order from child to parent
 *   elements.
 * - Events are extended with a function `event.stopPropagation()` to stop
 *   propagation to parent elements.
 * - An option `preventDefault` to stop all default browser behavior.
 *
 * Usage:
 *   var hammer = propagatingHammer(new Hammer(element));
 *   var hammer = propagatingHammer(new Hammer(element), {preventDefault: true});
 *
 * @param {Hammer.Manager} hammer   An hammer instance.
 * @param {Object} [options]        Available options:
 *                                  - `preventDefault: true | false | 'mouse' | 'touch' | 'pen'`.
 *                                    Enforce preventing the default browser behavior.
 *                                    Cannot be set to `false`.
 * @return {Hammer.Manager} Returns the same hammer instance with extended
 *                          functionality
 */
function propagating(hammer, options) {
  var _options = options || {
    preventDefault: false
  };

  if (hammer.Manager) {
    // This looks like the Hammer constructor.
    // Overload the constructors with our own.
    var Hammer = hammer;

    var PropagatingHammer = function(element, options) {
      var o = Object.create(_options);
      if (options) Hammer.assign(o, options);
      return propagating(new Hammer(element, o), o);
    };
    Hammer.assign(PropagatingHammer, Hammer);

    PropagatingHammer.Manager = function (element, options) {
      var o = Object.create(_options);
      if (options) Hammer.assign(o, options);
      return propagating(new Hammer.Manager(element, o), o);
    };

    return PropagatingHammer;
  }

  // create a wrapper object which will override the functions
  // `on`, `off`, `destroy`, and `emit` of the hammer instance
  var wrapper = Object.create(hammer);

  // attach to DOM element
  var element = hammer.element;

  if(!element.hammer) element.hammer = [];
  element.hammer.push(wrapper);

  // register an event to catch the start of a gesture and store the
  // target in a singleton
  hammer.on('hammer.input', function (event) {
    if (_options.preventDefault === true || (_options.preventDefault === event.pointerType)) {
      event.preventDefault();
    }
    if (event.isFirst) {
      _firstTarget = event.target;
    }
  });

  /** @type {Object.<String, Array.<function>>} */
  wrapper._handlers = {};

  /**
   * Register a handler for one or multiple events
   * @param {String} events    A space separated string with events
   * @param {function} handler A callback function, called as handler(event)
   * @returns {Hammer.Manager} Returns the hammer instance
   */
  wrapper.on = function (events, handler) {
    // register the handler
    split(events).forEach(function (event) {
      var _handlers = wrapper._handlers[event];
      if (!_handlers) {
        wrapper._handlers[event] = _handlers = [];

        // register the static, propagated handler
        hammer.on(event, propagatedHandler);
      }
      _handlers.push(handler);
    });

    return wrapper;
  };

  /**
   * Unregister a handler for one or multiple events
   * @param {String} events      A space separated string with events
   * @param {function} [handler] Optional. The registered handler. If not
   *                             provided, all handlers for given events
   *                             are removed.
   * @returns {Hammer.Manager}   Returns the hammer instance
   */
  wrapper.off = function (events, handler) {
    // unregister the handler
    split(events).forEach(function (event) {
      var _handlers = wrapper._handlers[event];
      if (_handlers) {
        _handlers = handler ? _handlers.filter(function (h) {
          return h !== handler;
        }) : [];

        if (_handlers.length > 0) {
          wrapper._handlers[event] = _handlers;
        }
        else {
          // remove static, propagated handler
          hammer.off(event, propagatedHandler);
          delete wrapper._handlers[event];
        }
      }
    });

    return wrapper;
  };

  /**
   * Emit to the event listeners
   * @param {string} eventType
   * @param {Event} event
   */
  wrapper.emit = function(eventType, event) {
    _firstTarget = event.target;
    hammer.emit(eventType, event);
  };

  wrapper.destroy = function () {
    // Detach from DOM element
    var hammers = hammer.element.hammer;
    var idx = hammers.indexOf(wrapper);
    if(idx !== -1) hammers.splice(idx,1);
    if(!hammers.length) delete hammer.element.hammer;

    // clear all handlers
    wrapper._handlers = {};

    // call original hammer destroy
    hammer.destroy();
  };

  // split a string with space separated words
  function split(events) {
    return events.match(/[^ ]+/g);
  }

  /**
   * A static event handler, applying event propagation.
   * @param {Object} event
   */
  function propagatedHandler(event) {
    // let only a single hammer instance handle this event
    if (event.type !== 'hammer.input') {
      // it is possible that the same srcEvent is used with multiple hammer events,
      // we keep track on which events are handled in an object _handled
      if (!event.srcEvent._handled) {
        event.srcEvent._handled = {};
      }

      if (event.srcEvent._handled[event.type]) {
        return;
      }
      else {
        event.srcEvent._handled[event.type] = true;
      }
    }

    // attach a stopPropagation function to the event
    var stopped = false;
    event.stopPropagation = function () {
      stopped = true;
    };

    //wrap the srcEvent's stopPropagation to also stop hammer propagation:
    var srcStop = event.srcEvent.stopPropagation.bind(event.srcEvent);
    if(typeof srcStop == "function") {
      event.srcEvent.stopPropagation = function(){
        srcStop();
        event.stopPropagation();
      };
    }

    // attach firstTarget property to the event
    event.firstTarget = _firstTarget;

    // propagate over all elements (until stopped)
    var elem = _firstTarget.isConnected ? _firstTarget : event.target;
    while (elem && !stopped) {
      var elemHammer = elem.hammer;
      if(elemHammer){
        var _handlers;
        for(var k = 0; k < elemHammer.length; k++){
          _handlers = elemHammer[k]._handlers[event.type];
          if(_handlers) for (var i = 0; i < _handlers.length && !stopped; i++) {
            _handlers[i](event);
          }
        }
      }
      elem = elem.parentNode;
    }
  }

  return wrapper;
}

/**
 * Setup a mock hammer.js object, for unit testing.
 *
 * Inspiration: https://github.com/uber/deck.gl/pull/658
 *
 * @returns {{on: noop, off: noop, destroy: noop, emit: noop, get: get}}
 */
function hammerMock() {
  const noop = () => {};
  return {
    on: noop,
    off: noop,
    destroy: noop,
    emit: noop,
    get() {
      return {
        set: noop
      };
    }
  };
}
let modifiedHammer;
if (typeof window !== "undefined") {
  const OurHammer = window["Hammer"] || Hammer$3;
  modifiedHammer = propagating(OurHammer, {
    preventDefault: "mouse"
  });
} else {
  modifiedHammer = function () {
    // hammer.js is only available in a browser, not in node.js. Replacing it with a mock object.
    return hammerMock();
  };
}
var Hammer = modifiedHammer;

/**
 * Register a touch event, taking place before a gesture
 * @param {Hammer} hammer       A hammer instance
 * @param {function} callback   Callback, called as callback(event)
 */
function onTouch(hammer, callback) {
  callback.inputHandler = function (event) {
    if (event.isFirst) {
      callback(event);
    }
  };
  hammer.on("hammer.input", callback.inputHandler);
}

/**
 * Register a release event, taking place after a gesture
 * @param {Hammer} hammer       A hammer instance
 * @param {function} callback   Callback, called as callback(event)
 * @returns {*}
 */
function onRelease(hammer, callback) {
  callback.inputHandler = function (event) {
    if (event.isFinal) {
      callback(event);
    }
  };
  return hammer.on("hammer.input", callback.inputHandler);
}

/**
 * Hack the PinchRecognizer such that it doesn't prevent default behavior
 * for vertical panning.
 *
 * Yeah ... this is quite a hack ... see https://github.com/hammerjs/hammer.js/issues/932
 *
 * @param {Hammer.Pinch} pinchRecognizer
 * @return {Hammer.Pinch} returns the pinchRecognizer
 */
function disablePreventDefaultVertically(pinchRecognizer) {
  const TOUCH_ACTION_PAN_Y = "pan-y";
  pinchRecognizer.getTouchAction = function () {
    // default method returns [TOUCH_ACTION_NONE]
    return [TOUCH_ACTION_PAN_Y];
  };
  return pinchRecognizer;
}

/**
 * The class TimeStep is an iterator for dates. You provide a start date and an
 * end date. The class itself determines the best scale (step size) based on the
 * provided start Date, end Date, and minimumStep.
 *
 * If minimumStep is provided, the step size is chosen as close as possible
 * to the minimumStep but larger than minimumStep. If minimumStep is not
 * provided, the scale is set to 1 DAY.
 * The minimumStep should correspond with the onscreen size of about 6 characters
 *
 * Alternatively, you can set a scale by hand.
 * After creation, you can initialize the class by executing first(). Then you
 * can iterate from the start date to the end date via next(). You can check if
 * the end date is reached with the function hasNext(). After each step, you can
 * retrieve the current date via getCurrent().
 * The TimeStep has scales ranging from milliseconds, seconds, minutes, hours,
 * days, to years.
 *
 * Version: 1.2
 *
 */
class TimeStep {
  /**
   * @param {Date} [start]         The start date, for example new Date(2010, 9, 21)
   *                               or new Date(2010, 9, 21, 23, 45, 00)
   * @param {Date} [end]           The end date
   * @param {number} [minimumStep] Optional. Minimum step size in milliseconds
   * @param {Date|Array.<Date>} [hiddenDates] Optional.
   * @param {{showMajorLabels: boolean, showWeekScale: boolean}} [options] Optional.
   * @constructor  TimeStep
   */
  constructor(start, end, minimumStep, hiddenDates, options) {
    this.moment = options && options.moment || moment$2;
    this.options = options ? options : {};

    // variables
    this.current = this.moment();
    this._start = this.moment();
    this._end = this.moment();
    this.autoScale = true;
    this.scale = "day";
    this.step = 1;

    // initialize the range
    this.setRange(start, end, minimumStep);

    // hidden Dates options
    this.switchedDay = false;
    this.switchedMonth = false;
    this.switchedYear = false;
    if (_Array$isArray(hiddenDates)) {
      this.hiddenDates = hiddenDates;
    } else if (hiddenDates != undefined) {
      this.hiddenDates = [hiddenDates];
    } else {
      this.hiddenDates = [];
    }
    this.format = TimeStep.FORMAT; // default formatting
  }

  /**
   * Set custom constructor function for moment. Can be used to set dates
   * to UTC or to set a utcOffset.
   * @param {function} moment
   */
  setMoment(moment) {
    this.moment = moment;

    // update the date properties, can have a new utcOffset
    this.current = this.moment(this.current.valueOf());
    this._start = this.moment(this._start.valueOf());
    this._end = this.moment(this._end.valueOf());
  }

  /**
   * Set custom formatting for the minor an major labels of the TimeStep.
   * Both `minorLabels` and `majorLabels` are an Object with properties:
   * 'millisecond', 'second', 'minute', 'hour', 'weekday', 'day', 'week', 'month', 'year'.
   * @param {{minorLabels: Object, majorLabels: Object}} format
   */
  setFormat(format) {
    const defaultFormat = availableUtils.deepExtend({}, TimeStep.FORMAT);
    this.format = availableUtils.deepExtend(defaultFormat, format);
  }

  /**
   * Set a new range
   * If minimumStep is provided, the step size is chosen as close as possible
   * to the minimumStep but larger than minimumStep. If minimumStep is not
   * provided, the scale is set to 1 DAY.
   * The minimumStep should correspond with the onscreen size of about 6 characters
   * @param {Date} [start]      The start date and time.
   * @param {Date} [end]        The end date and time.
   * @param {int} [minimumStep] Optional. Minimum step size in milliseconds
   */
  setRange(start, end, minimumStep) {
    if (!(start instanceof Date) || !(end instanceof Date)) {
      throw "No legal start or end date in method setRange";
    }
    this._start = start != undefined ? this.moment(start.valueOf()) : _Date$now();
    this._end = end != undefined ? this.moment(end.valueOf()) : _Date$now();
    if (this.autoScale) {
      this.setMinimumStep(minimumStep);
    }
  }

  /**
   * Set the range iterator to the start date.
   */
  start() {
    this.current = this._start.clone();
    this.roundToMinor();
  }

  /**
   * Round the current date to the first minor date value
   * This must be executed once when the current date is set to start Date
   */
  roundToMinor() {
    // round to floor
    // to prevent year & month scales rounding down to the first day of week we perform this separately
    if (this.scale == "week") {
      this.current.weekday(0);
    }
    // IMPORTANT: we have no breaks in this switch! (this is no bug)
    // noinspection FallThroughInSwitchStatementJS
    switch (this.scale) {
      case "year":
        this.current = this.current.year(this.step * Math.floor(this.current.year() / this.step)).month(0);
      // eslint-disable-next-line no-fallthrough
      case "month":
        this.current = this.current.date(1);
      // eslint-disable-next-line no-fallthrough
      case "week":
      case "day":
      case "weekday":
        this.current = this.current.hours(0);
      // eslint-disable-next-line no-fallthrough
      case "hour":
        this.current = this.current.minutes(0);
      // eslint-disable-next-line no-fallthrough
      case "minute":
        this.current = this.current.seconds(0);
      // eslint-disable-next-line no-fallthrough
      case "second":
        this.current = this.current.milliseconds(0);
      //case 'millisecond': // nothing to do for milliseconds
    }
    if (this.step != 1) {
      // round down to the first minor value that is a multiple of the current step size
      let priorCurrent = this.current.clone();
      switch (this.scale) {
        case "millisecond":
          this.current = this.current.subtract(this.current.milliseconds() % this.step, "milliseconds");
          break;
        case "second":
          this.current = this.current.subtract(this.current.seconds() % this.step, "seconds");
          break;
        case "minute":
          this.current = this.current.subtract(this.current.minutes() % this.step, "minutes");
          break;
        case "hour":
          this.current = this.current.subtract(this.current.hours() % this.step, "hours");
          break;
        case "weekday": // intentional fall through
        case "day":
          this.current = this.current.subtract((this.current.date() - 1) % this.step, "day");
          break;
        case "week":
          this.current = this.current.subtract(this.current.week() % this.step, "week");
          break;
        case "month":
          this.current = this.current.subtract(this.current.month() % this.step, "month");
          break;
        case "year":
          this.current = this.current.subtract(this.current.year() % this.step, "year");
          break;
      }
      if (!priorCurrent.isSame(this.current)) {
        this.current = this.moment(snapAwayFromHidden(this.hiddenDates, this.current.valueOf(), -1, true));
      }
    }
  }

  /**
   * Check if the there is a next step
   * @return {boolean}  true if the current date has not passed the end date
   */
  hasNext() {
    return this.current.valueOf() <= this._end.valueOf();
  }

  /**
   * Do the next step
   */
  next() {
    const prev = this.current.valueOf();

    // Two cases, needed to prevent issues with switching daylight savings
    // (end of March and end of October)
    switch (this.scale) {
      case "millisecond":
        this.current = this.current.add(this.step, "millisecond");
        break;
      case "second":
        this.current = this.current.add(this.step, "second");
        break;
      case "minute":
        this.current = this.current.add(this.step, "minute");
        break;
      case "hour":
        this.current = this.current.add(this.step, "hour");
        if (this.current.month() < 6) {
          this.current = this.current.subtract(this.current.hours() % this.step, "hour");
        } else {
          if (this.current.hours() % this.step !== 0) {
            this.current = this.current.add(this.step - this.current.hours() % this.step, "hour");
          }
        }
        break;
      case "weekday": // intentional fall through
      case "day":
        this.current = this.current.add(this.step, "day");
        break;
      case "week":
        if (this.current.weekday() !== 0) {
          // we had a month break not correlating with a week's start before
          this.current = this.current.weekday(0).add(this.step, "week"); // switch back to week cycles
        } else if (this.options.showMajorLabels === false) {
          this.current = this.current.add(this.step, "week"); // the default case
        } else {
          // first day of the week
          const nextWeek = this.current.clone();
          nextWeek.add(1, "week");
          if (nextWeek.isSame(this.current, "month")) {
            // is the first day of the next week in the same month?
            this.current = this.current.add(this.step, "week"); // the default case
          } else {
            // inject a step at each first day of the month
            this.current = this.current.add(this.step, "week").date(1);
          }
        }
        break;
      case "month":
        this.current = this.current.add(this.step, "month");
        break;
      case "year":
        this.current = this.current.add(this.step, "year");
        break;
    }
    if (this.step != 1) {
      // round down to the correct major value
      switch (this.scale) {
        case "millisecond":
          if (this.current.milliseconds() > 0 && this.current.milliseconds() < this.step) this.current = this.current.milliseconds(0);
          break;
        case "second":
          if (this.current.seconds() > 0 && this.current.seconds() < this.step) this.current = this.current.seconds(0);
          break;
        case "minute":
          if (this.current.minutes() > 0 && this.current.minutes() < this.step) this.current = this.current.minutes(0);
          break;
        case "hour":
          if (this.current.hours() > 0 && this.current.hours() < this.step) this.current = this.current.hours(0);
          break;
        case "weekday": // intentional fall through
        case "day":
          if (this.current.date() < this.step + 1) this.current = this.current.date(1);
          break;
        case "week":
          if (this.current.week() < this.step) this.current = this.current.week(1); // week numbering starts at 1, not 0
          break;
        case "month":
          if (this.current.month() < this.step) this.current = this.current.month(0);
          break;
      }
    }

    // safety mechanism: if current time is still unchanged, move to the end
    if (this.current.valueOf() == prev) {
      this.current = this._end.clone();
    }

    // Reset switches for year, month and day. Will get set to true where appropriate in DateUtil.stepOverHiddenDates
    this.switchedDay = false;
    this.switchedMonth = false;
    this.switchedYear = false;
    stepOverHiddenDates(this.moment, this, prev);
  }

  /**
   * Get the current datetime
   * @return {Moment}  current The current date
   */
  getCurrent() {
    return this.current.clone();
  }

  /**
   * Set a custom scale. Autoscaling will be disabled.
   * For example setScale('minute', 5) will result
   * in minor steps of 5 minutes, and major steps of an hour.
   *
   * @param {{scale: string, step: number}} params
   *                               An object containing two properties:
   *                               - A string 'scale'. Choose from 'millisecond', 'second',
   *                                 'minute', 'hour', 'weekday', 'day', 'week', 'month', 'year'.
   *                               - A number 'step'. A step size, by default 1.
   *                                 Choose for example 1, 2, 5, or 10.
   */
  setScale(params) {
    if (params && typeof params.scale == "string") {
      this.scale = params.scale;
      this.step = params.step > 0 ? params.step : 1;
      this.autoScale = false;
    }
  }

  /**
   * Enable or disable autoscaling
   * @param {boolean} enable  If true, autoascaling is set true
   */
  setAutoScale(enable) {
    this.autoScale = enable;
  }

  /**
   * Automatically determine the scale that bests fits the provided minimum step
   * @param {number} [minimumStep]  The minimum step size in milliseconds
   */
  setMinimumStep(minimumStep) {
    if (minimumStep == undefined) {
      return;
    }

    //var b = asc + ds;

    const stepYear = 1000 * 60 * 60 * 24 * 30 * 12;
    const stepMonth = 1000 * 60 * 60 * 24 * 30;
    const stepDay = 1000 * 60 * 60 * 24;
    const stepHour = 1000 * 60 * 60;
    const stepMinute = 1000 * 60;
    const stepSecond = 1000;
    const stepMillisecond = 1;

    // find the smallest step that is larger than the provided minimumStep
    if (stepYear * 1000 > minimumStep) {
      this.scale = "year";
      this.step = 1000;
    }
    if (stepYear * 500 > minimumStep) {
      this.scale = "year";
      this.step = 500;
    }
    if (stepYear * 100 > minimumStep) {
      this.scale = "year";
      this.step = 100;
    }
    if (stepYear * 50 > minimumStep) {
      this.scale = "year";
      this.step = 50;
    }
    if (stepYear * 10 > minimumStep) {
      this.scale = "year";
      this.step = 10;
    }
    if (stepYear * 5 > minimumStep) {
      this.scale = "year";
      this.step = 5;
    }
    if (stepYear > minimumStep) {
      this.scale = "year";
      this.step = 1;
    }
    if (stepMonth * 3 > minimumStep) {
      this.scale = "month";
      this.step = 3;
    }
    if (stepMonth > minimumStep) {
      this.scale = "month";
      this.step = 1;
    }
    if (stepDay * 7 > minimumStep && this.options.showWeekScale) {
      this.scale = "week";
      this.step = 1;
    }
    if (stepDay * 2 > minimumStep) {
      this.scale = "day";
      this.step = 2;
    }
    if (stepDay > minimumStep) {
      this.scale = "day";
      this.step = 1;
    }
    if (stepDay / 2 > minimumStep) {
      this.scale = "weekday";
      this.step = 1;
    }
    if (stepHour * 4 > minimumStep) {
      this.scale = "hour";
      this.step = 4;
    }
    if (stepHour > minimumStep) {
      this.scale = "hour";
      this.step = 1;
    }
    if (stepMinute * 15 > minimumStep) {
      this.scale = "minute";
      this.step = 15;
    }
    if (stepMinute * 10 > minimumStep) {
      this.scale = "minute";
      this.step = 10;
    }
    if (stepMinute * 5 > minimumStep) {
      this.scale = "minute";
      this.step = 5;
    }
    if (stepMinute > minimumStep) {
      this.scale = "minute";
      this.step = 1;
    }
    if (stepSecond * 15 > minimumStep) {
      this.scale = "second";
      this.step = 15;
    }
    if (stepSecond * 10 > minimumStep) {
      this.scale = "second";
      this.step = 10;
    }
    if (stepSecond * 5 > minimumStep) {
      this.scale = "second";
      this.step = 5;
    }
    if (stepSecond > minimumStep) {
      this.scale = "second";
      this.step = 1;
    }
    if (stepMillisecond * 200 > minimumStep) {
      this.scale = "millisecond";
      this.step = 200;
    }
    if (stepMillisecond * 100 > minimumStep) {
      this.scale = "millisecond";
      this.step = 100;
    }
    if (stepMillisecond * 50 > minimumStep) {
      this.scale = "millisecond";
      this.step = 50;
    }
    if (stepMillisecond * 10 > minimumStep) {
      this.scale = "millisecond";
      this.step = 10;
    }
    if (stepMillisecond * 5 > minimumStep) {
      this.scale = "millisecond";
      this.step = 5;
    }
    if (stepMillisecond > minimumStep) {
      this.scale = "millisecond";
      this.step = 1;
    }
  }

  /**
   * Snap a date to a rounded value.
   * The snap intervals are dependent on the current scale and step.
   * Static function
   * @param {Date} date    the date to be snapped.
   * @param {string} scale Current scale, can be 'millisecond', 'second',
   *                       'minute', 'hour', 'weekday, 'day', 'week', 'month', 'year'.
   * @param {number} step  Current step (1, 2, 4, 5, ...
   * @return {Date} snappedDate
   */
  static snap(date, scale, step) {
    let clone = moment$2(date);
    if (scale == "year") {
      const year = clone.year() + Math.round(clone.month() / 12);
      clone = clone.year(Math.round(year / step) * step).month(0).date(0).hours(0).minutes(0).seconds(0).milliseconds(0);
    } else if (scale == "month") {
      if (clone.date() > 15) {
        clone = clone.date(1).add(1, "month"); // important: first set Date to 1, after that change the month.
      } else {
        clone = clone.date(1);
      }
      clone = clone.hours(0).minutes(0).seconds(0).milliseconds(0);
    } else if (scale == "week") {
      if (clone.weekday() > 2) {
        // doing it the momentjs locale aware way
        clone = clone.weekday(0).add(1, "week");
      } else {
        clone = clone.weekday(0);
      }
      clone = clone.hours(0).minutes(0).seconds(0).milliseconds(0);
    } else if (scale == "day") {
      //noinspection FallthroughInSwitchStatementJS
      switch (step) {
        case 5:
        case 2:
          clone = clone.hours(Math.round(clone.hours() / 24) * 24);
          break;
        default:
          clone = clone.hours(Math.round(clone.hours() / 12) * 12);
          break;
      }
      clone = clone.minutes(0).seconds(0).milliseconds(0);
    } else if (scale == "weekday") {
      //noinspection FallthroughInSwitchStatementJS
      switch (step) {
        case 5:
        case 2:
          clone = clone.hours(Math.round(clone.hours() / 12) * 12);
          break;
        default:
          clone = clone.hours(Math.round(clone.hours() / 6) * 6);
          break;
      }
      clone = clone.minutes(0).seconds(0).milliseconds(0);
    } else if (scale == "hour") {
      switch (step) {
        case 4:
          clone = clone.minutes(Math.round(clone.minutes() / 60) * 60);
          break;
        default:
          clone = clone.minutes(Math.round(clone.minutes() / 30) * 30);
          break;
      }
      clone = clone.seconds(0).milliseconds(0);
    } else if (scale == "minute") {
      //noinspection FallthroughInSwitchStatementJS
      switch (step) {
        case 15:
        case 10:
          clone = clone.minutes(Math.round(clone.minutes() / 5) * 5).seconds(0);
          break;
        case 5:
          clone = clone.seconds(Math.round(clone.seconds() / 60) * 60);
          break;
        default:
          clone = clone.seconds(Math.round(clone.seconds() / 30) * 30);
          break;
      }
      clone = clone.milliseconds(0);
    } else if (scale == "second") {
      //noinspection FallthroughInSwitchStatementJS
      switch (step) {
        case 15:
        case 10:
          clone = clone.seconds(Math.round(clone.seconds() / 5) * 5).milliseconds(0);
          break;
        case 5:
          clone = clone.milliseconds(Math.round(clone.milliseconds() / 1000) * 1000);
          break;
        default:
          clone = clone.milliseconds(Math.round(clone.milliseconds() / 500) * 500);
          break;
      }
    } else if (scale == "millisecond") {
      const _step = step > 5 ? step / 2 : 1;
      clone = clone.milliseconds(Math.round(clone.milliseconds() / _step) * _step);
    }
    return clone;
  }

  /**
   * Check if the current value is a major value (for example when the step
   * is DAY, a major value is each first day of the MONTH)
   * @return {boolean} true if current date is major, else false.
   */
  isMajor() {
    if (this.switchedYear == true) {
      switch (this.scale) {
        case "year":
        case "month":
        case "week":
        case "weekday":
        case "day":
        case "hour":
        case "minute":
        case "second":
        case "millisecond":
          return true;
        default:
          return false;
      }
    } else if (this.switchedMonth == true) {
      switch (this.scale) {
        case "week":
        case "weekday":
        case "day":
        case "hour":
        case "minute":
        case "second":
        case "millisecond":
          return true;
        default:
          return false;
      }
    } else if (this.switchedDay == true) {
      switch (this.scale) {
        case "millisecond":
        case "second":
        case "minute":
        case "hour":
          return true;
        default:
          return false;
      }
    }
    const date = this.moment(this.current);
    switch (this.scale) {
      case "millisecond":
        return date.milliseconds() == 0;
      case "second":
        return date.seconds() == 0;
      case "minute":
        return date.hours() == 0 && date.minutes() == 0;
      case "hour":
        return date.hours() == 0;
      case "weekday": // intentional fall through
      case "day":
        return this.options.showWeekScale ? date.isoWeekday() == 1 : date.date() == 1;
      case "week":
        return date.date() == 1;
      case "month":
        return date.month() == 0;
      case "year":
        return false;
      default:
        return false;
    }
  }

  /**
   * Returns formatted text for the minor axislabel, depending on the current
   * date and the scale. For example when scale is MINUTE, the current time is
   * formatted as "hh:mm".
   * @param {Date} [date=this.current] custom date. if not provided, current date is taken
   * @returns {String}
   */
  getLabelMinor(date) {
    if (date == undefined) {
      date = this.current;
    }
    if (date instanceof Date) {
      date = this.moment(date);
    }
    if (typeof this.format.minorLabels === "function") {
      return this.format.minorLabels(date, this.scale, this.step);
    }
    const format = this.format.minorLabels[this.scale];
    // noinspection FallThroughInSwitchStatementJS
    switch (this.scale) {
      case "week":
        // Don't draw the minor label if this date is the first day of a month AND if it's NOT the start of the week.
        // The 'date' variable may actually be the 'next' step when called from TimeAxis' _repaintLabels.
        if (date.date() === 1 && date.weekday() !== 0) {
          return "";
        }
      // eslint-disable-next-line no-fallthrough
      default:
        return format && format.length > 0 ? this.moment(date).format(format) : "";
    }
  }

  /**
   * Returns formatted text for the major axis label, depending on the current
   * date and the scale. For example when scale is MINUTE, the major scale is
   * hours, and the hour will be formatted as "hh".
   * @param {Date} [date=this.current] custom date. if not provided, current date is taken
   * @returns {String}
   */
  getLabelMajor(date) {
    if (date == undefined) {
      date = this.current;
    }
    if (date instanceof Date) {
      date = this.moment(date);
    }
    if (typeof this.format.majorLabels === "function") {
      return this.format.majorLabels(date, this.scale, this.step);
    }
    const format = this.format.majorLabels[this.scale];
    return format && format.length > 0 ? this.moment(date).format(format) : "";
  }

  /**
   * get class name
   * @return {string} class name
   */
  getClassName() {
    var _context;
    const _moment = this.moment;
    const m = this.moment(this.current);
    const current = m.locale ? m.locale("en") : m.lang("en"); // old versions of moment have .lang() function
    const step = this.step;
    const classNames = [];

    /**
     *
     * @param {number} value
     * @returns {String}
     */
    function even(value) {
      return value / step % 2 == 0 ? " vis-even" : " vis-odd";
    }

    /**
     *
     * @param {Date} date
     * @returns {String}
     */
    function today(date) {
      if (date.isSame(_Date$now(), "day")) {
        return " vis-today";
      }
      if (date.isSame(_moment().add(1, "day"), "day")) {
        return " vis-tomorrow";
      }
      if (date.isSame(_moment().add(-1, "day"), "day")) {
        return " vis-yesterday";
      }
      return "";
    }

    /**
     *
     * @param {Date} date
     * @returns {String}
     */
    function currentWeek(date) {
      return date.isSame(_Date$now(), "week") ? " vis-current-week" : "";
    }

    /**
     *
     * @param {Date} date
     * @returns {String}
     */
    function currentMonth(date) {
      return date.isSame(_Date$now(), "month") ? " vis-current-month" : "";
    }

    /**
     *
     * @param {Date} date
     * @returns {String}
     */
    function currentYear(date) {
      return date.isSame(_Date$now(), "year") ? " vis-current-year" : "";
    }
    switch (this.scale) {
      case "millisecond":
        classNames.push(today(current));
        classNames.push(even(current.milliseconds()));
        break;
      case "second":
        classNames.push(today(current));
        classNames.push(even(current.seconds()));
        break;
      case "minute":
        classNames.push(today(current));
        classNames.push(even(current.minutes()));
        break;
      case "hour":
        classNames.push(_concatInstanceProperty(_context = "vis-h".concat(current.hours())).call(_context, this.step == 4 ? "-h" + (current.hours() + 4) : ""));
        classNames.push(today(current));
        classNames.push(even(current.hours()));
        break;
      case "weekday":
        classNames.push("vis-".concat(current.format("dddd").toLowerCase()));
        classNames.push(today(current));
        classNames.push(currentWeek(current));
        classNames.push(even(current.date()));
        break;
      case "day":
        classNames.push("vis-day".concat(current.date()));
        classNames.push("vis-".concat(current.format("MMMM").toLowerCase()));
        classNames.push(today(current));
        classNames.push(currentMonth(current));
        classNames.push(this.step <= 2 ? today(current) : "");
        classNames.push(this.step <= 2 ? "vis-".concat(current.format("dddd").toLowerCase()) : "");
        classNames.push(even(current.date() - 1));
        break;
      case "week":
        classNames.push("vis-week".concat(current.format("w")));
        classNames.push(currentWeek(current));
        classNames.push(even(current.week()));
        break;
      case "month":
        classNames.push("vis-".concat(current.format("MMMM").toLowerCase()));
        classNames.push(currentMonth(current));
        classNames.push(even(current.month()));
        break;
      case "year":
        classNames.push("vis-year".concat(current.year()));
        classNames.push(currentYear(current));
        classNames.push(even(current.year()));
        break;
    }
    return _filterInstanceProperty(classNames).call(classNames, String).join(" ");
  }
}

// Time formatting
TimeStep.FORMAT = {
  minorLabels: {
    millisecond: "SSS",
    second: "s",
    minute: "HH:mm",
    hour: "HH:mm",
    weekday: "ddd D",
    day: "D",
    week: "w",
    month: "MMM",
    year: "YYYY"
  },
  majorLabels: {
    millisecond: "HH:mm:ss",
    second: "D MMMM HH:mm",
    minute: "ddd D MMMM",
    hour: "ddd D MMMM",
    weekday: "MMMM YYYY",
    day: "MMMM YYYY",
    week: "MMMM YYYY",
    month: "YYYY",
    year: ""
  }
};

/** A horizontal time axis */
class TimeAxis extends Component {
  /**
   * @param {{dom: Object, domProps: Object, emitter: Emitter, range: Range}} body
   * @param {Object} [options]        See TimeAxis.setOptions for the available
   *                                  options.
   * @constructor TimeAxis
   * @extends Component
   */
  constructor(body, options) {
    super();
    this.dom = {
      foreground: null,
      lines: [],
      majorTexts: [],
      minorTexts: [],
      redundant: {
        lines: [],
        majorTexts: [],
        minorTexts: []
      }
    };
    this.props = {
      range: {
        start: 0,
        end: 0,
        minimumStep: 0
      },
      lineTop: 0
    };
    this.defaultOptions = {
      orientation: {
        axis: "bottom"
      },
      // axis orientation: 'top' or 'bottom'
      showMinorLabels: true,
      showMajorLabels: true,
      showWeekScale: false,
      maxMinorChars: 7,
      format: availableUtils.extend({}, TimeStep.FORMAT),
      moment: moment$2,
      timeAxis: null
    };
    this.options = availableUtils.extend({}, this.defaultOptions);
    this.body = body;

    // create the HTML DOM
    this._create();
    this.setOptions(options);
  }

  /**
   * Set options for the TimeAxis.
   * Parameters will be merged in current options.
   * @param {Object} options  Available options:
   *                          {string} [orientation.axis]
   *                          {boolean} [showMinorLabels]
   *                          {boolean} [showMajorLabels]
   *                          {boolean} [showWeekScale]
   */
  setOptions(options) {
    if (options) {
      // copy all options that we know
      availableUtils.selectiveExtend(["showMinorLabels", "showMajorLabels", "showWeekScale", "maxMinorChars", "hiddenDates", "timeAxis", "moment", "rtl"], this.options, options);

      // deep copy the format options
      availableUtils.selectiveDeepExtend(["format"], this.options, options);
      if ("orientation" in options) {
        if (typeof options.orientation === "string") {
          this.options.orientation.axis = options.orientation;
        } else if (typeof options.orientation === "object" && "axis" in options.orientation) {
          this.options.orientation.axis = options.orientation.axis;
        }
      }

      // apply locale to moment.js
      // TODO: not so nice, this is applied globally to moment.js
      if ("locale" in options) {
        if (typeof moment$2.locale === "function") {
          // moment.js 2.8.1+
          moment$2.locale(options.locale);
        } else {
          moment$2.lang(options.locale);
        }
      }
    }
  }

  /**
   * Create the HTML DOM for the TimeAxis
   */
  _create() {
    this.dom.foreground = document.createElement("div");
    this.dom.background = document.createElement("div");
    this.dom.foreground.className = "vis-time-axis vis-foreground";
    this.dom.background.className = "vis-time-axis vis-background";
  }

  /**
   * Destroy the TimeAxis
   */
  destroy() {
    // remove from DOM
    if (this.dom.foreground.parentNode) {
      this.dom.foreground.parentNode.removeChild(this.dom.foreground);
    }
    if (this.dom.background.parentNode) {
      this.dom.background.parentNode.removeChild(this.dom.background);
    }
    this.body = null;
  }

  /**
   * Repaint the component
   * @return {boolean} Returns true if the component is resized
   */
  redraw() {
    const props = this.props;
    const foreground = this.dom.foreground;
    const background = this.dom.background;

    // determine the correct parent DOM element (depending on option orientation)
    const parent = this.options.orientation.axis == "top" ? this.body.dom.top : this.body.dom.bottom;
    const parentChanged = foreground.parentNode !== parent;

    // calculate character width and height
    this._calculateCharSize();

    // TODO: recalculate sizes only needed when parent is resized or options is changed
    const showMinorLabels = this.options.showMinorLabels && this.options.orientation.axis !== "none";
    const showMajorLabels = this.options.showMajorLabels && this.options.orientation.axis !== "none";

    // determine the width and height of the elemens for the axis
    props.minorLabelHeight = showMinorLabels ? props.minorCharHeight : 0;
    props.majorLabelHeight = showMajorLabels ? props.majorCharHeight : 0;
    props.height = props.minorLabelHeight + props.majorLabelHeight;
    props.width = foreground.offsetWidth;
    props.minorLineHeight = this.body.domProps.root.height - props.majorLabelHeight - (this.options.orientation.axis == "top" ? this.body.domProps.bottom.height : this.body.domProps.top.height);
    props.minorLineWidth = 1; // TODO: really calculate width
    props.majorLineHeight = props.minorLineHeight + props.majorLabelHeight;
    props.majorLineWidth = 1; // TODO: really calculate width

    //  take foreground and background offline while updating (is almost twice as fast)
    const foregroundNextSibling = foreground.nextSibling;
    const backgroundNextSibling = background.nextSibling;
    foreground.parentNode && foreground.parentNode.removeChild(foreground);
    background.parentNode && background.parentNode.removeChild(background);
    foreground.style.height = "".concat(this.props.height, "px");
    this._repaintLabels();

    // put DOM online again (at the same place)
    if (foregroundNextSibling) {
      parent.insertBefore(foreground, foregroundNextSibling);
    } else {
      parent.appendChild(foreground);
    }
    if (backgroundNextSibling) {
      this.body.dom.backgroundVertical.insertBefore(background, backgroundNextSibling);
    } else {
      this.body.dom.backgroundVertical.appendChild(background);
    }
    return this._isResized() || parentChanged;
  }

  /**
   * Repaint major and minor text labels and vertical grid lines
   * @private
   */
  _repaintLabels() {
    const orientation = this.options.orientation.axis;

    // calculate range and step (step such that we have space for 7 characters per label)
    const start = availableUtils.convert(this.body.range.start, "Number");
    const end = availableUtils.convert(this.body.range.end, "Number");
    const timeLabelsize = this.body.util.toTime((this.props.minorCharWidth || 10) * this.options.maxMinorChars).valueOf();
    let minimumStep = timeLabelsize - getHiddenDurationBefore(this.options.moment, this.body.hiddenDates, this.body.range, timeLabelsize);
    minimumStep -= this.body.util.toTime(0).valueOf();
    const step = new TimeStep(new Date(start), new Date(end), minimumStep, this.body.hiddenDates, this.options);
    step.setMoment(this.options.moment);
    if (this.options.format) {
      step.setFormat(this.options.format);
    }
    if (this.options.timeAxis) {
      step.setScale(this.options.timeAxis);
    }
    this.step = step;

    // Move all DOM elements to a "redundant" list, where they
    // can be picked for re-use, and clear the lists with lines and texts.
    // At the end of the function _repaintLabels, left over elements will be cleaned up
    const dom = this.dom;
    dom.redundant.lines = dom.lines;
    dom.redundant.majorTexts = dom.majorTexts;
    dom.redundant.minorTexts = dom.minorTexts;
    dom.lines = [];
    dom.majorTexts = [];
    dom.minorTexts = [];
    let current;
    let next;
    let x;
    let xNext;
    let isMajor;
    let showMinorGrid;
    let width = 0;
    let prevWidth;
    let line;
    let xFirstMajorLabel = undefined;
    let count = 0;
    const MAX = 1000;
    let className;
    step.start();
    next = step.getCurrent();
    xNext = this.body.util.toScreen(next);
    while (step.hasNext() && count < MAX) {
      count++;
      isMajor = step.isMajor();
      className = step.getClassName();
      current = next;
      x = xNext;
      step.next();
      next = step.getCurrent();
      xNext = this.body.util.toScreen(next);
      prevWidth = width;
      width = xNext - x;
      switch (step.scale) {
        case "week":
          showMinorGrid = true;
          break;
        default:
          showMinorGrid = width >= prevWidth * 0.4;
          break;
        // prevent displaying of the 31th of the month on a scale of 5 days
      }
      if (this.options.showMinorLabels && showMinorGrid) {
        var label = this._repaintMinorText(x, step.getLabelMinor(current), orientation, className);
        label.style.width = "".concat(width, "px"); // set width to prevent overflow
      }
      if (isMajor && this.options.showMajorLabels) {
        if (x > 0) {
          if (xFirstMajorLabel == undefined) {
            xFirstMajorLabel = x;
          }
          label = this._repaintMajorText(x, step.getLabelMajor(current), orientation, className);
        }
        line = this._repaintMajorLine(x, width, orientation, className);
      } else {
        // minor line
        if (showMinorGrid) {
          line = this._repaintMinorLine(x, width, orientation, className);
        } else {
          if (line) {
            // adjust the width of the previous grid
            line.style.width = "".concat(_parseInt(line.style.width) + width, "px");
          }
        }
      }
    }
    if (count === MAX && !warnedForOverflow) {
      console.warn("Something is wrong with the Timeline scale. Limited drawing of grid lines to ".concat(MAX, " lines."));
      warnedForOverflow = true;
    }

    // create a major label on the left when needed
    if (this.options.showMajorLabels) {
      const leftTime = this.body.util.toTime(0); // upper bound estimation
      const leftText = step.getLabelMajor(leftTime);
      const widthText = leftText.length * (this.props.majorCharWidth || 10) + 10;
      if (xFirstMajorLabel == undefined || widthText < xFirstMajorLabel) {
        this._repaintMajorText(0, leftText, orientation, className);
      }
    }

    // Cleanup leftover DOM elements from the redundant list
    _forEachInstanceProperty(availableUtils).call(availableUtils, this.dom.redundant, arr => {
      while (arr.length) {
        const elem = arr.pop();
        if (elem && elem.parentNode) {
          elem.parentNode.removeChild(elem);
        }
      }
    });
  }

  /**
   * Create a minor label for the axis at position x
   * @param {number} x
   * @param {string} text
   * @param {string} orientation   "top" or "bottom" (default)
   * @param {string} className
   * @return {Element} Returns the HTML element of the created label
   * @private
   */
  _repaintMinorText(x, text, orientation, className) {
    // reuse redundant label
    let label = this.dom.redundant.minorTexts.shift();
    if (!label) {
      // create new label
      const content = document.createTextNode("");
      label = document.createElement("div");
      label.appendChild(content);
      this.dom.foreground.appendChild(label);
    }
    this.dom.minorTexts.push(label);
    label.innerHTML = availableUtils.xss(text);
    let y = orientation == "top" ? this.props.majorLabelHeight : 0;
    this._setXY(label, x, y);
    label.className = "vis-text vis-minor ".concat(className);
    //label.title = title;  // TODO: this is a heavy operation

    return label;
  }

  /**
   * Create a Major label for the axis at position x
   * @param {number} x
   * @param {string} text
   * @param {string} orientation   "top" or "bottom" (default)
   * @param {string} className
   * @return {Element} Returns the HTML element of the created label
   * @private
   */
  _repaintMajorText(x, text, orientation, className) {
    // reuse redundant label
    let label = this.dom.redundant.majorTexts.shift();
    if (!label) {
      // create label
      const content = document.createElement("div");
      label = document.createElement("div");
      label.appendChild(content);
      this.dom.foreground.appendChild(label);
    }
    label.childNodes[0].innerHTML = availableUtils.xss(text);
    label.className = "vis-text vis-major ".concat(className);
    //label.title = title; // TODO: this is a heavy operation

    let y = orientation == "top" ? 0 : this.props.minorLabelHeight;
    this._setXY(label, x, y);
    this.dom.majorTexts.push(label);
    return label;
  }

  /**
   * sets xy
   * @param {string} label
   * @param {number} x
   * @param {number} y
   * @private
   */
  _setXY(label, x, y) {
    var _context;
    // If rtl is true, inverse x.
    const directionX = this.options.rtl ? x * -1 : x;
    label.style.transform = _concatInstanceProperty(_context = "translate(".concat(directionX, "px, ")).call(_context, y, "px)");
  }

  /**
   * Create a minor line for the axis at position x
   * @param {number} left
   * @param {number} width
   * @param {string} orientation   "top" or "bottom" (default)
   * @param {string} className
   * @return {Element} Returns the created line
   * @private
   */
  _repaintMinorLine(left, width, orientation, className) {
    var _context2;
    // reuse redundant line
    let line = this.dom.redundant.lines.shift();
    if (!line) {
      // create vertical line
      line = document.createElement("div");
      this.dom.background.appendChild(line);
    }
    this.dom.lines.push(line);
    const props = this.props;
    line.style.width = "".concat(width, "px");
    line.style.height = "".concat(props.minorLineHeight, "px");
    let y = orientation == "top" ? props.majorLabelHeight : this.body.domProps.top.height;
    let x = left - props.minorLineWidth / 2;
    this._setXY(line, x, y);
    line.className = _concatInstanceProperty(_context2 = "vis-grid ".concat(this.options.rtl ? "vis-vertical-rtl" : "vis-vertical", " vis-minor ")).call(_context2, className);
    return line;
  }

  /**
   * Create a Major line for the axis at position x
   * @param {number} left
   * @param {number} width
   * @param {string} orientation   "top" or "bottom" (default)
   * @param {string} className
   * @return {Element} Returns the created line
   * @private
   */
  _repaintMajorLine(left, width, orientation, className) {
    var _context3;
    // reuse redundant line
    let line = this.dom.redundant.lines.shift();
    if (!line) {
      // create vertical line
      line = document.createElement("div");
      this.dom.background.appendChild(line);
    }
    this.dom.lines.push(line);
    const props = this.props;
    line.style.width = "".concat(width, "px");
    line.style.height = "".concat(props.majorLineHeight, "px");
    let y = orientation == "top" ? 0 : this.body.domProps.top.height;
    let x = left - props.majorLineWidth / 2;
    this._setXY(line, x, y);
    line.className = _concatInstanceProperty(_context3 = "vis-grid ".concat(this.options.rtl ? "vis-vertical-rtl" : "vis-vertical", " vis-major ")).call(_context3, className);
    return line;
  }

  /**
   * Determine the size of text on the axis (both major and minor axis).
   * The size is calculated only once and then cached in this.props.
   * @private
   */
  _calculateCharSize() {
    // Note: We calculate char size with every redraw. Size may change, for
    // example when any of the timelines parents had display:none for example.

    // determine the char width and height on the minor axis
    if (!this.dom.measureCharMinor) {
      this.dom.measureCharMinor = document.createElement("DIV");
      this.dom.measureCharMinor.className = "vis-text vis-minor vis-measure";
      this.dom.measureCharMinor.style.position = "absolute";
      this.dom.measureCharMinor.appendChild(document.createTextNode("0"));
      this.dom.foreground.appendChild(this.dom.measureCharMinor);
    }
    this.props.minorCharHeight = this.dom.measureCharMinor.clientHeight;
    this.props.minorCharWidth = this.dom.measureCharMinor.clientWidth;

    // determine the char width and height on the major axis
    if (!this.dom.measureCharMajor) {
      this.dom.measureCharMajor = document.createElement("DIV");
      this.dom.measureCharMajor.className = "vis-text vis-major vis-measure";
      this.dom.measureCharMajor.style.position = "absolute";
      this.dom.measureCharMajor.appendChild(document.createTextNode("0"));
      this.dom.foreground.appendChild(this.dom.measureCharMajor);
    }
    this.props.majorCharHeight = this.dom.measureCharMajor.clientHeight;
    this.props.majorCharWidth = this.dom.measureCharMajor.clientWidth;
  }
}
var warnedForOverflow = false;

/**
 * Created by Alex on 11/6/2014.
 */
function keycharm(options) {

  var container = window;

  var _exportFunctions = {};
  var _bound = {keydown:{}, keyup:{}};
  var _keys = {};
  var i;

  // a - z
  for (i = 97; i <= 122; i++) {_keys[String.fromCharCode(i)] = {code:65 + (i - 97), shift: false};}
  // A - Z
  for (i = 65; i <= 90; i++) {_keys[String.fromCharCode(i)] = {code:i, shift: true};}
  // 0 - 9
  for (i = 0;  i <= 9;   i++) {_keys['' + i] = {code:48 + i, shift: false};}
  // F1 - F12
  for (i = 1;  i <= 12;   i++) {_keys['F' + i] = {code:111 + i, shift: false};}
  // num0 - num9
  for (i = 0;  i <= 9;   i++) {_keys['num' + i] = {code:96 + i, shift: false};}

  // numpad misc
  _keys['num*'] = {code:106, shift: false};
  _keys['num+'] = {code:107, shift: false};
  _keys['num-'] = {code:109, shift: false};
  _keys['num/'] = {code:111, shift: false};
  _keys['num.'] = {code:110, shift: false};
  // arrows
  _keys['left']  = {code:37, shift: false};
  _keys['up']    = {code:38, shift: false};
  _keys['right'] = {code:39, shift: false};
  _keys['down']  = {code:40, shift: false};
  // extra keys
  _keys['space'] = {code:32, shift: false};
  _keys['enter'] = {code:13, shift: false};
  _keys['shift'] = {code:16, shift: undefined};
  _keys['esc']   = {code:27, shift: false};
  _keys['backspace'] = {code:8, shift: false};
  _keys['tab']       = {code:9, shift: false};
  _keys['ctrl']      = {code:17, shift: false};
  _keys['alt']       = {code:18, shift: false};
  _keys['delete']    = {code:46, shift: false};
  _keys['pageup']    = {code:33, shift: false};
  _keys['pagedown']  = {code:34, shift: false};
  // symbols
  _keys['=']     = {code:187, shift: false};
  _keys['-']     = {code:189, shift: false};
  _keys[']']     = {code:221, shift: false};
  _keys['[']     = {code:219, shift: false};



  var down = function(event) {handleEvent(event,'keydown');};
  var up = function(event) {handleEvent(event,'keyup');};

  // handle the actualy bound key with the event
  var handleEvent = function(event,type) {
    if (_bound[type][event.keyCode] !== undefined) {
      var bound = _bound[type][event.keyCode];
      for (var i = 0; i < bound.length; i++) {
        if (bound[i].shift === undefined) {
          bound[i].fn(event);
        }
        else if (bound[i].shift == true && event.shiftKey == true) {
          bound[i].fn(event);
        }
        else if (bound[i].shift == false && event.shiftKey == false) {
          bound[i].fn(event);
        }
      }
    }
  };

  // bind a key to a callback
  _exportFunctions.bind = function(key, callback, type) {
    if (type === undefined) {
      type = 'keydown';
    }
    if (_keys[key] === undefined) {
      throw new Error("unsupported key: " + key);
    }
    if (_bound[type][_keys[key].code] === undefined) {
      _bound[type][_keys[key].code] = [];
    }
    _bound[type][_keys[key].code].push({fn:callback, shift:_keys[key].shift});
  };


  // bind all keys to a call back (demo purposes)
  _exportFunctions.bindAll = function(callback, type) {
    if (type === undefined) {
      type = 'keydown';
    }
    for (var key in _keys) {
      if (_keys.hasOwnProperty(key)) {
        _exportFunctions.bind(key,callback,type);
      }
    }
  };

  // get the key label from an event
  _exportFunctions.getKey = function(event) {
    for (var key in _keys) {
      if (_keys.hasOwnProperty(key)) {
        if (event.shiftKey == true && _keys[key].shift == true && event.keyCode == _keys[key].code) {
          return key;
        }
        else if (event.shiftKey == false && _keys[key].shift == false && event.keyCode == _keys[key].code) {
          return key;
        }
        else if (event.keyCode == _keys[key].code && key == 'shift') {
          return key;
        }
      }
    }
    return "unknown key, currently not supported";
  };

  // unbind either a specific callback from a key or all of them (by leaving callback undefined)
  _exportFunctions.unbind = function(key, callback, type) {
    if (type === undefined) {
      type = 'keydown';
    }
    if (_keys[key] === undefined) {
      throw new Error("unsupported key: " + key);
    }
    if (callback !== undefined) {
      var newBindings = [];
      var bound = _bound[type][_keys[key].code];
      if (bound !== undefined) {
        for (var i = 0; i < bound.length; i++) {
          if (!(bound[i].fn == callback && bound[i].shift == _keys[key].shift)) {
            newBindings.push(_bound[type][_keys[key].code][i]);
          }
        }
      }
      _bound[type][_keys[key].code] = newBindings;
    }
    else {
      _bound[type][_keys[key].code] = [];
    }
  };

  // reset all bound variables.
  _exportFunctions.reset = function() {
    _bound = {keydown:{}, keyup:{}};
  };

  // unbind all listeners and reset all variables.
  _exportFunctions.destroy = function() {
    _bound = {keydown:{}, keyup:{}};
    container.removeEventListener('keydown', down, true);
    container.removeEventListener('keyup', up, true);
  };

  // create listeners.
  container.addEventListener('keydown',down,true);
  container.addEventListener('keyup',up,true);

  // return the public functions.
  return _exportFunctions;
}

/**
 * Turn an element into an clickToUse element.
 * When not active, the element has a transparent overlay. When the overlay is
 * clicked, the mode is changed to active.
 * When active, the element is displayed with a blue border around it, and
 * the interactive contents of the element can be used. When clicked outside
 * the element, the elements mode is changed to inactive.
 * @param {Element} container
 * @constructor Activator
 */
function Activator(container) {
  var _context, _context2;
  this.active = false;
  this.dom = {
    container: container
  };
  this.dom.overlay = document.createElement("div");
  this.dom.overlay.className = "vis-overlay";
  this.dom.container.appendChild(this.dom.overlay);
  this.hammer = Hammer(this.dom.overlay);
  this.hammer.on("tap", _bindInstanceProperty(_context = this._onTapOverlay).call(_context, this));

  // block all touch events (except tap)
  var me = this;
  var events = ["tap", "doubletap", "press", "pinch", "pan", "panstart", "panmove", "panend"];
  _forEachInstanceProperty(events).call(events, function (event) {
    me.hammer.on(event, function (event) {
      event.stopPropagation();
    });
  });

  // attach a click event to the window, in order to deactivate when clicking outside the timeline
  if (document && document.body) {
    this.onClick = function (event) {
      if (!_hasParent(event.target, container)) {
        me.deactivate();
      }
    };
    document.body.addEventListener("click", this.onClick);
  }
  if (this.keycharm !== undefined) {
    this.keycharm.destroy();
  }
  this.keycharm = keycharm();

  // keycharm listener only bounded when active)
  this.escListener = _bindInstanceProperty(_context2 = this.deactivate).call(_context2, this);
}

// turn into an event emitter
Emitter(Activator.prototype);

// The currently active activator
Activator.current = null;

/**
 * Destroy the activator. Cleans up all created DOM and event listeners
 */
Activator.prototype.destroy = function () {
  this.deactivate();

  // remove dom
  this.dom.overlay.parentNode.removeChild(this.dom.overlay);

  // remove global event listener
  if (this.onClick) {
    document.body.removeEventListener("click", this.onClick);
  }
  // remove keycharm
  if (this.keycharm !== undefined) {
    this.keycharm.destroy();
  }
  this.keycharm = null;
  // cleanup hammer instances
  this.hammer.destroy();
  this.hammer = null;
  // FIXME: cleaning up hammer instances doesn't work (Timeline not removed from memory)
};

/**
 * Activate the element
 * Overlay is hidden, element is decorated with a blue shadow border
 */
Activator.prototype.activate = function () {
  var _context3;
  // we allow only one active activator at a time
  if (Activator.current) {
    Activator.current.deactivate();
  }
  Activator.current = this;
  this.active = true;
  this.dom.overlay.style.display = "none";
  availableUtils.addClassName(this.dom.container, "vis-active");
  this.emit("change");
  this.emit("activate");

  // ugly hack: bind ESC after emitting the events, as the Network rebinds all
  // keyboard events on a 'change' event
  _bindInstanceProperty(_context3 = this.keycharm).call(_context3, "esc", this.escListener);
};

/**
 * Deactivate the element
 * Overlay is displayed on top of the element
 */
Activator.prototype.deactivate = function () {
  if (Activator.current === this) {
    Activator.current = null;
  }
  this.active = false;
  this.dom.overlay.style.display = "";
  availableUtils.removeClassName(this.dom.container, "vis-active");
  this.keycharm.unbind("esc", this.escListener);
  this.emit("change");
  this.emit("deactivate");
};

/**
 * Handle a tap event: activate the container
 * @param {Event}  event   The event
 * @private
 */
Activator.prototype._onTapOverlay = function (event) {
  // activate the container
  this.activate();
  event.stopPropagation();
};

/**
 * Test whether the element has the requested parent element somewhere in
 * its chain of parent nodes.
 * @param {HTMLElement} element
 * @param {HTMLElement} parent
 * @returns {boolean} Returns true when the parent is found somewhere in the
 *                    chain of parent nodes.
 * @private
 */
function _hasParent(element, parent) {
  while (element) {
    if (element === parent) {
      return true;
    }
    element = element.parentNode;
  }
  return false;
}

/*
 * IMPORTANT: Locales for Moment has to be imported in the legacy and standalone
 * entry points. For the peer build it's users responsibility to do so.
 */

// English
const en = {
  current: "current",
  time: "time",
  deleteSelected: "Delete selected"
};
const en_EN = en;
const en_US = en;

// Italiano
const it = {
  current: "attuale",
  time: "tempo",
  deleteSelected: "Cancella la selezione"
};
const it_IT = it;
const it_CH = it;

// Dutch
const nl = {
  current: "huidige",
  time: "tijd",
  deleteSelected: "Selectie verwijderen"
};
const nl_NL = nl;
const nl_BE = nl;

// German
const de = {
  current: "Aktuelle",
  time: "Zeit",
  deleteSelected: "L\u00f6sche Auswahl"
};
const de_DE = de;
const de_CH = de;

// French
const fr = {
  current: "actuel",
  time: "heure",
  deleteSelected: "Effacer la selection"
};
const fr_FR = fr;
const fr_CA = fr;
const fr_BE = fr;
const fr_CH = fr;

// Espanol
const es = {
  current: "actual",
  time: "hora",
  deleteSelected: "Eliminar selecci\u00f3n"
};
const es_ES = es;

// Ukrainian
const uk = {
  current: "поточний",
  time: "час",
  deleteSelected: "Видалити обране"
};
const uk_UA = uk;

// Russian
const ru = {
  current: "текущее",
  time: "время",
  deleteSelected: "Удалить выбранное"
};
const ru_RU = ru;

// Polish
const pl = {
  current: "aktualny",
  time: "czas",
  deleteSelected: "Usuń wybrane"
};
const pl_PL = pl;

// Portuguese
const pt = {
  current: "atual",
  time: "data",
  deleteSelected: "Apagar selecionado"
};
const pt_BR = pt;
const pt_PT = pt;

// Turkish
const tr = {
  current: "güncel",
  time: "zaman",
  deleteSelected: "Seçileni sil"
};
const tr_TR = tr;

// Japanese
const ja = {
  current: "現在",
  time: "時刻",
  deleteSelected: "選択されたものを削除"
};
const ja_JP = ja;

// Swedish
const sv = {
  current: "nuvarande",
  time: "tid",
  deleteSelected: "Radera valda"
};
const sv_SE = sv;

// Norwegian
const nb = {
  current: "nåværende",
  time: "tid",
  deleteSelected: "Slett valgte"
};
const nb_NO = nb;
const nn = nb;
const nn_NO = nb;

// Lithuanian
const lt = {
  current: "einamas",
  time: "laikas",
  deleteSelected: "Pašalinti pasirinktą"
};
const lt_LT = lt;
const locales = {
  en,
  en_EN,
  en_US,
  it,
  it_IT,
  it_CH,
  nl,
  nl_NL,
  nl_BE,
  de,
  de_DE,
  de_CH,
  fr,
  fr_FR,
  fr_CA,
  fr_BE,
  fr_CH,
  es,
  es_ES,
  uk,
  uk_UA,
  ru,
  ru_RU,
  pl,
  pl_PL,
  pt,
  pt_BR,
  pt_PT,
  tr,
  tr_TR,
  ja,
  ja_JP,
  lt,
  lt_LT,
  sv,
  sv_SE,
  nb,
  nn,
  nb_NO,
  nn_NO
};

/** A custom time bar */
class CustomTime extends Component {
  /**
   * @param {{range: Range, dom: Object}} body
   * @param {Object} [options]        Available parameters:
   *                                  {number | string} id
   *                                  {string} locales
   *                                  {string} locale
   * @constructor CustomTime
   * @extends Component
   */
  constructor(body, options) {
    var _context;
    super();
    this.body = body;

    // default options
    this.defaultOptions = {
      moment: moment$2,
      locales,
      locale: "en",
      id: undefined,
      title: undefined
    };
    this.options = availableUtils.extend({}, this.defaultOptions);
    this.setOptions(options);
    this.options.locales = availableUtils.extend({}, locales, this.options.locales);
    const defaultLocales = this.defaultOptions.locales[this.defaultOptions.locale];
    _forEachInstanceProperty(_context = _Object$keys(this.options.locales)).call(_context, locale => {
      this.options.locales[locale] = availableUtils.extend({}, defaultLocales, this.options.locales[locale]);
    });
    if (options && options.time != null) {
      this.customTime = options.time;
    } else {
      this.customTime = new Date();
    }
    this.eventParams = {}; // stores state parameters while dragging the bar

    // create the DOM
    this._create();
  }

  /**
   * Set options for the component. Options will be merged in current options.
   * @param {Object} options  Available parameters:
   *                                  {number | string} id
   *                                  {string} locales
   *                                  {string} locale
   */
  setOptions(options) {
    if (options) {
      // copy all options that we know
      availableUtils.selectiveExtend(["moment", "locale", "locales", "id", "title", "rtl", "snap"], this.options, options);
    }
  }

  /**
   * Create the DOM for the custom time
   * @private
   */
  _create() {
    var _context2, _context3, _context4;
    const bar = document.createElement("div");
    bar["custom-time"] = this;
    bar.className = "vis-custom-time ".concat(this.options.id || "");
    bar.style.position = "absolute";
    bar.style.top = "0px";
    bar.style.height = "100%";
    this.bar = bar;
    const drag = document.createElement("div");
    drag.style.position = "relative";
    drag.style.top = "0px";
    if (this.options.rtl) {
      drag.style.right = "-10px";
    } else {
      drag.style.left = "-10px";
    }
    drag.style.height = "100%";
    drag.style.width = "20px";

    /**
     *
     * @param {WheelEvent} e
     */
    function onMouseWheel(e) {
      this.body.range._onMouseWheel(e);
    }
    if (drag.addEventListener) {
      // IE9, Chrome, Safari, Opera
      drag.addEventListener("mousewheel", _bindInstanceProperty(onMouseWheel).call(onMouseWheel, this), false);
      // Firefox
      drag.addEventListener("DOMMouseScroll", _bindInstanceProperty(onMouseWheel).call(onMouseWheel, this), false);
    } else {
      // IE 6/7/8
      drag.attachEvent("onmousewheel", _bindInstanceProperty(onMouseWheel).call(onMouseWheel, this));
    }
    bar.appendChild(drag);
    // attach event listeners
    this.hammer = new Hammer(drag);
    this.hammer.on("panstart", _bindInstanceProperty(_context2 = this._onDragStart).call(_context2, this));
    this.hammer.on("panmove", _bindInstanceProperty(_context3 = this._onDrag).call(_context3, this));
    this.hammer.on("panend", _bindInstanceProperty(_context4 = this._onDragEnd).call(_context4, this));
    this.hammer.get("pan").set({
      threshold: 5,
      direction: Hammer.DIRECTION_ALL
    });
    // delay addition on item click for trackpads...
    this.hammer.get("press").set({
      time: 10000
    });
  }

  /**
   * Destroy the CustomTime bar
   */
  destroy() {
    this.hide();
    this.hammer.destroy();
    this.hammer = null;
    this.body = null;
  }

  /**
   * Repaint the component
   * @return {boolean} Returns true if the component is resized
   */
  redraw() {
    const parent = this.body.dom.backgroundVertical;
    if (this.bar.parentNode != parent) {
      // attach to the dom
      if (this.bar.parentNode) {
        this.bar.parentNode.removeChild(this.bar);
      }
      parent.appendChild(this.bar);
    }
    const x = this.body.util.toScreen(this.customTime);
    let locale = this.options.locales[this.options.locale];
    if (!locale) {
      if (!this.warned) {
        console.warn("WARNING: options.locales['".concat(this.options.locale, "'] not found. See https://visjs.github.io/vis-timeline/docs/timeline/#Localization"));
        this.warned = true;
      }
      locale = this.options.locales["en"]; // fall back on english when not available
    }
    let title = this.options.title;
    // To hide the title completely use empty string ''.
    if (title === undefined) {
      var _context5;
      title = _concatInstanceProperty(_context5 = "".concat(locale.time, ": ")).call(_context5, this.options.moment(this.customTime).format("dddd, MMMM Do YYYY, H:mm:ss"));
      title = title.charAt(0).toUpperCase() + title.substring(1);
    } else if (typeof title === "function") {
      title = title.call(this, this.customTime);
    }
    this.options.rtl ? this.bar.style.right = "".concat(x, "px") : this.bar.style.left = "".concat(x, "px");
    this.bar.title = title;
    return false;
  }

  /**
   * Remove the CustomTime from the DOM
   */
  hide() {
    // remove the line from the DOM
    if (this.bar.parentNode) {
      this.bar.parentNode.removeChild(this.bar);
    }
  }

  /**
   * Set custom time.
   * @param {Date | number | string} time
   */
  setCustomTime(time) {
    this.customTime = availableUtils.convert(time, "Date");
    this.redraw();
  }

  /**
   * Retrieve the current custom time.
   * @return {Date} customTime
   */
  getCustomTime() {
    return new Date(this.customTime.valueOf());
  }

  /**
   * Set custom marker.
   * @param {string} [title] Title of the custom marker
   * @param {boolean} [editable] Make the custom marker editable.
   */
  setCustomMarker(title, editable) {
    if (this.marker) {
      this.bar.removeChild(this.marker);
    }
    this.marker = document.createElement("div");
    this.marker.className = "vis-custom-time-marker";
    this.marker.innerHTML = availableUtils.xss(title);
    this.marker.style.position = "absolute";
    if (editable) {
      var _context6;
      this.marker.setAttribute("contenteditable", "true");
      this.marker.addEventListener("pointerdown", () => {
        this.marker.focus();
      });
      this.marker.addEventListener("input", _bindInstanceProperty(_context6 = this._onMarkerChange).call(_context6, this));
      // The editable div element has no change event, so here emulates the change event.
      this.marker.title = title;
      this.marker.addEventListener("blur", event => {
        if (this.title != event.target.innerHTML) {
          this._onMarkerChanged(event);
          this.title = event.target.innerHTML;
        }
      });
    }
    this.bar.appendChild(this.marker);
  }

  /**
   * Set custom title.
   * @param {Date | number | string} title
   */
  setCustomTitle(title) {
    this.options.title = title;
  }

  /**
   * Start moving horizontally
   * @param {Event} event
   * @private
   */
  _onDragStart(event) {
    this.eventParams.dragging = true;
    this.eventParams.customTime = this.customTime;
    event.stopPropagation();
  }

  /**
   * Perform moving operating.
   * @param {Event} event
   * @private
   */
  _onDrag(event) {
    if (!this.eventParams.dragging) return;
    let deltaX = this.options.rtl ? -1 * event.deltaX : event.deltaX;
    const x = this.body.util.toScreen(this.eventParams.customTime) + deltaX;
    const time = this.body.util.toTime(x);
    const scale = this.body.util.getScale();
    const step = this.body.util.getStep();
    const snap = this.options.snap;
    const snappedTime = snap ? snap(time, scale, step) : time;
    this.setCustomTime(snappedTime);

    // fire a timechange event
    this.body.emitter.emit("timechange", {
      id: this.options.id,
      time: new Date(this.customTime.valueOf()),
      event
    });
    event.stopPropagation();
  }

  /**
   * Stop moving operating.
   * @param {Event} event
   * @private
   */
  _onDragEnd(event) {
    if (!this.eventParams.dragging) return;

    // fire a timechanged event
    this.body.emitter.emit("timechanged", {
      id: this.options.id,
      time: new Date(this.customTime.valueOf()),
      event
    });
    event.stopPropagation();
  }

  /**
   * Perform input operating.
   * @param {Event} event
   * @private
   */
  _onMarkerChange(event) {
    this.body.emitter.emit("markerchange", {
      id: this.options.id,
      title: event.target.innerHTML,
      event
    });
    event.stopPropagation();
  }

  /**
   * Perform change operating.
   * @param {Event} event
   * @private
   */
  _onMarkerChanged(event) {
    this.body.emitter.emit("markerchanged", {
      id: this.options.id,
      title: event.target.innerHTML,
      event
    });
    event.stopPropagation();
  }

  /**
   * Find a custom time from an event target:
   * searches for the attribute 'custom-time' in the event target's element tree
   * @param {Event} event
   * @return {CustomTime | null} customTime
   */
  static customTimeFromTarget(event) {
    let target = event.target;
    while (target) {
      if (Object.prototype.hasOwnProperty.call(target, "custom-time")) {
        return target["custom-time"];
      }
      target = target.parentNode;
    }
    return null;
  }
}

/**
 * Create a timeline visualization
 * @constructor Core
 */
class Core {
  /**
   * Create the main DOM for the Core: a root panel containing left, right,
   * top, bottom, content, and background panel.
   * @param {Element} container  The container element where the Core will
   *                             be attached.
   * @protected
   */
  _create(container) {
    var _context, _context2, _context3;
    this.dom = {};
    this.dom.container = container;
    this.dom.container.style.position = "relative";
    this.dom.root = document.createElement("div");
    this.dom.background = document.createElement("div");
    this.dom.backgroundVertical = document.createElement("div");
    this.dom.backgroundHorizontal = document.createElement("div");
    this.dom.centerContainer = document.createElement("div");
    this.dom.leftContainer = document.createElement("div");
    this.dom.rightContainer = document.createElement("div");
    this.dom.center = document.createElement("div");
    this.dom.left = document.createElement("div");
    this.dom.right = document.createElement("div");
    this.dom.top = document.createElement("div");
    this.dom.bottom = document.createElement("div");
    this.dom.shadowTop = document.createElement("div");
    this.dom.shadowBottom = document.createElement("div");
    this.dom.shadowTopLeft = document.createElement("div");
    this.dom.shadowBottomLeft = document.createElement("div");
    this.dom.shadowTopRight = document.createElement("div");
    this.dom.shadowBottomRight = document.createElement("div");
    this.dom.rollingModeBtn = document.createElement("div");
    this.dom.loadingScreen = document.createElement("div");
    this.dom.root.className = "vis-timeline";
    this.dom.background.className = "vis-panel vis-background";
    this.dom.backgroundVertical.className = "vis-panel vis-background vis-vertical";
    this.dom.backgroundHorizontal.className = "vis-panel vis-background vis-horizontal";
    this.dom.centerContainer.className = "vis-panel vis-center";
    this.dom.leftContainer.className = "vis-panel vis-left";
    this.dom.rightContainer.className = "vis-panel vis-right";
    this.dom.top.className = "vis-panel vis-top";
    this.dom.bottom.className = "vis-panel vis-bottom";
    this.dom.left.className = "vis-content";
    this.dom.center.className = "vis-content";
    this.dom.right.className = "vis-content";
    this.dom.shadowTop.className = "vis-shadow vis-top";
    this.dom.shadowBottom.className = "vis-shadow vis-bottom";
    this.dom.shadowTopLeft.className = "vis-shadow vis-top";
    this.dom.shadowBottomLeft.className = "vis-shadow vis-bottom";
    this.dom.shadowTopRight.className = "vis-shadow vis-top";
    this.dom.shadowBottomRight.className = "vis-shadow vis-bottom";
    this.dom.rollingModeBtn.className = "vis-rolling-mode-btn";
    this.dom.loadingScreen.className = "vis-loading-screen";
    this.dom.root.appendChild(this.dom.background);
    this.dom.root.appendChild(this.dom.backgroundVertical);
    this.dom.root.appendChild(this.dom.backgroundHorizontal);
    this.dom.root.appendChild(this.dom.centerContainer);
    this.dom.root.appendChild(this.dom.leftContainer);
    this.dom.root.appendChild(this.dom.rightContainer);
    this.dom.root.appendChild(this.dom.top);
    this.dom.root.appendChild(this.dom.bottom);
    this.dom.root.appendChild(this.dom.rollingModeBtn);
    this.dom.centerContainer.appendChild(this.dom.center);
    this.dom.leftContainer.appendChild(this.dom.left);
    this.dom.rightContainer.appendChild(this.dom.right);
    this.dom.centerContainer.appendChild(this.dom.shadowTop);
    this.dom.centerContainer.appendChild(this.dom.shadowBottom);
    this.dom.leftContainer.appendChild(this.dom.shadowTopLeft);
    this.dom.leftContainer.appendChild(this.dom.shadowBottomLeft);
    this.dom.rightContainer.appendChild(this.dom.shadowTopRight);
    this.dom.rightContainer.appendChild(this.dom.shadowBottomRight);

    // size properties of each of the panels
    this.props = {
      root: {},
      background: {},
      centerContainer: {},
      leftContainer: {},
      rightContainer: {},
      center: {},
      left: {},
      right: {},
      top: {},
      bottom: {},
      border: {},
      scrollTop: 0,
      scrollTopMin: 0
    };
    this.on("rangechange", () => {
      if (this.initialDrawDone === true) {
        this._redraw();
      }
    });
    this.on("rangechanged", () => {
      if (!this.initialRangeChangeDone) {
        this.initialRangeChangeDone = true;
      }
    });
    this.on("touch", _bindInstanceProperty(_context = this._onTouch).call(_context, this));
    this.on("panmove", _bindInstanceProperty(_context2 = this._onDrag).call(_context2, this));
    const me = this;
    this._origRedraw = _bindInstanceProperty(_context3 = this._redraw).call(_context3, this);
    this._redraw = availableUtils.throttle(this._origRedraw);
    this.on("_change", properties => {
      if (me.itemSet && me.itemSet.initialItemSetDrawn && properties && properties.queue == true) {
        me._redraw();
      } else {
        me._origRedraw();
      }
    });

    // create event listeners for all interesting events, these events will be
    // emitted via emitter
    this.hammer = new Hammer(this.dom.root);
    const pinchRecognizer = this.hammer.get("pinch").set({
      enable: true
    });
    pinchRecognizer && disablePreventDefaultVertically(pinchRecognizer);
    this.hammer.get("pan").set({
      threshold: 5,
      direction: Hammer.DIRECTION_ALL
    });
    this.timelineListeners = {};
    const events = ["tap", "doubletap", "press", "pinch", "pan", "panstart", "panmove", "panend"
    // TODO: cleanup
    //'touch', 'pinch',
    //'tap', 'doubletap', 'hold',
    //'dragstart', 'drag', 'dragend',
    //'mousewheel', 'DOMMouseScroll' // DOMMouseScroll is needed for Firefox
    ];
    _forEachInstanceProperty(events).call(events, type => {
      const listener = event => {
        if (me.isActive()) {
          me.emit(type, event);
        }
      };
      me.hammer.on(type, listener);
      me.timelineListeners[type] = listener;
    });

    // emulate a touch event (emitted before the start of a pan, pinch, tap, or press)
    onTouch(this.hammer, event => {
      me.emit("touch", event);
    });

    // emulate a release event (emitted after a pan, pinch, tap, or press)
    onRelease(this.hammer, event => {
      me.emit("release", event);
    });

    /**
     *
     * @param {WheelEvent} event
     */
    function onMouseWheel(event) {
      // Only allow scroll-wheel interaction if timeline is active and clickToUse is set to true.
      if (!this.isActive()) return;
      this.emit("mousewheel", event);

      // Prevent scrolling when zooming (no zoom key, or pressing zoom key)
      if (this.options.preferZoom) {
        // Return if key not configured OR is currently pressed (zoom only).
        // TODO: Possible Bug: Should it not be the inverse behaviour? Aka. if pressed should allow user to scroll?
        if (!this.options.zoomKey || event[this.options.zoomKey]) return;
      } else {
        // Return if key configured AND currently pressed
        if (this.options.zoomKey && event[this.options.zoomKey]) return;
      }

      // Don't preventDefault if you can't scroll
      if (!this.options.verticalScroll && !this.options.horizontalScroll) return;

      // deltaX and deltaY normalization from jquery.mousewheel.js
      let deltaX = 0;
      let deltaY = 0;

      // Old school scrollwheel delta
      if ("detail" in event) deltaY = event.detail * -1;
      if ("wheelDelta" in event) deltaY = event.wheelDelta;
      if ("wheelDeltaY" in event) deltaY = event.wheelDeltaY;
      if ("wheelDeltaX" in event) deltaX = event.wheelDeltaX * -1;

      // Firefox < 17 horizontal scrolling related to DOMMouseScroll event
      if ("axis" in event && event.axis === event.HORIZONTAL_AXIS) {
        deltaX = deltaY * -1;
        deltaY = 0;
      }

      // New school wheel delta (wheel event)
      if ("deltaY" in event) {
        deltaY = event.deltaY * -1;
      }
      if ("deltaX" in event) {
        deltaX = event.deltaX;
      }

      // Reasonable default wheel deltas
      var LINE_HEIGHT = 40;
      var PAGE_HEIGHT = 800;

      // Normalize deltas
      if (event.deltaMode) {
        if (event.deltaMode === 1) {
          // delta in LINE units
          deltaX *= LINE_HEIGHT;
          deltaY *= LINE_HEIGHT;
        } else {
          // delta in PAGE units
          deltaX *= LINE_HEIGHT;
          deltaY *= PAGE_HEIGHT;
        }
      }

      // Vertical scroll preferred unless 'horizontalScrollKey' is configured and currently pressed.
      const isVerticalScrollingPreferred = this.options.verticalScroll;
      const isCurrentlyScrollingWithVerticalScrollWheel = Math.abs(deltaY) >= Math.abs(deltaX);
      const isHorizontalScrollKeyConfiguredAndPressed = this.options.horizontalScroll && this.options.horizontalScrollKey && event[this.options.horizontalScrollKey];
      if (isVerticalScrollingPreferred && isCurrentlyScrollingWithVerticalScrollWheel && !isHorizontalScrollKeyConfiguredAndPressed) {
        const current = this.props.scrollTop;
        const adjusted = current + deltaY;
        const newScrollTop = this._setScrollTop(adjusted);
        if (newScrollTop !== current) {
          this._redraw();
          this.emit("scroll", event);

          // Prevent default actions caused by mouse wheel
          // (else the page and timeline both scroll)
          event.preventDefault();
        }
        return;
      }

      // If option 'verticalScroll' disabled or 'horizontalScroll' is configured
      if (this.options.horizontalScroll) {
        this.range.stopRolling();

        // Depending on the mouse wheel used chose the delta (some mice have the hardware for both)
        const delta = isCurrentlyScrollingWithVerticalScrollWheel ? deltaY : deltaX;

        // Calculate a single scroll jump relative to the range scale
        let diff = delta / 120 * (this.range.end - this.range.start) / 20;

        // Invert scroll direction
        //  ...unless the user uses a horizontal mouse-wheel as found on the "Logi Master" series.
        // In other words only invert the direction when a vertical scroll-wheel is used.
        // Reason: Usually the user controls this behaviour via the driver software and it isn't linked to the vertical-scroll behaviour.
        if (this.options.horizontalScrollInvert && isCurrentlyScrollingWithVerticalScrollWheel) diff = -diff;

        // calculate new start and end
        const newStart = this.range.start + diff;
        const newEnd = this.range.end + diff;
        const options = {
          animation: false,
          byUser: true,
          event: event
        };
        this.range.setRange(newStart, newEnd, options);
        event.preventDefault();

        // Here in case of any future behaviour following after
        return;
      }
    }

    // Add modern wheel event listener
    const wheelType = "onwheel" in document.createElement("div") ? "wheel" // Modern browsers support "wheel"
    : document.onmousewheel !== undefined ? "mousewheel" // Webkit and IE support at least "mousewheel"
    :
    // DOMMouseScroll - Older Firefox versions use "DOMMouseScroll"
    // onmousewheel - All the use "onmousewheel"
    this.dom.centerContainer.addEventListener ? "DOMMouseScroll" : "onmousewheel";
    this.dom.top.addEventListener ? "DOMMouseScroll" : "onmousewheel";
    this.dom.bottom.addEventListener ? "DOMMouseScroll" : "onmousewheel";
    this.dom.centerContainer.addEventListener(wheelType, _bindInstanceProperty(onMouseWheel).call(onMouseWheel, this), false);
    this.dom.top.addEventListener(wheelType, _bindInstanceProperty(onMouseWheel).call(onMouseWheel, this), false);
    this.dom.bottom.addEventListener(wheelType, _bindInstanceProperty(onMouseWheel).call(onMouseWheel, this), false);

    /**
     *
     * @param {scroll} event
     */
    function onMouseScrollSide(event) {
      if (!me.options.verticalScroll) return;
      event.preventDefault();
      if (me.isActive()) {
        const adjusted = -event.target.scrollTop;
        me._setScrollTop(adjusted);
        me._redraw();
        me.emit("scrollSide", event);
      }
    }
    this.dom.left.parentNode.addEventListener("scroll", _bindInstanceProperty(onMouseScrollSide).call(onMouseScrollSide, this));
    this.dom.right.parentNode.addEventListener("scroll", _bindInstanceProperty(onMouseScrollSide).call(onMouseScrollSide, this));
    let itemAddedToTimeline = false;

    /**
     *
     * @param {dragover} event
     * @returns {boolean}
     */
    function handleDragOver(event) {
      var _context4;
      if (event.preventDefault) {
        me.emit("dragover", me.getEventProperties(event));
        event.preventDefault(); // Necessary. Allows us to drop.
      }

      // make sure your target is a timeline element
      if (!(_indexOfInstanceProperty(_context4 = event.target.className).call(_context4, "timeline") > -1)) return;

      // make sure only one item is added every time you're over the timeline
      if (itemAddedToTimeline) return;
      event.dataTransfer.dropEffect = "move";
      itemAddedToTimeline = true;
      return false;
    }

    /**
     *
     * @param {drop} event
     * @returns {boolean}
     */
    function handleDrop(event) {
      // prevent redirect to blank page - Firefox
      if (event.preventDefault) {
        event.preventDefault();
      }
      if (event.stopPropagation) {
        event.stopPropagation();
      }
      // return when dropping non-timeline items
      try {
        var itemData = JSON.parse(event.dataTransfer.getData("text"));
        if (!itemData || !itemData.content) return;
      } catch (err) {
        return false;
      }
      itemAddedToTimeline = false;
      event.center = {
        x: event.clientX,
        y: event.clientY
      };
      if (itemData.target !== "item") {
        me.itemSet._onAddItem(event);
      } else {
        me.itemSet._onDropObjectOnItem(event);
      }
      me.emit("drop", me.getEventProperties(event));
      return false;
    }
    this.dom.center.addEventListener("dragover", _bindInstanceProperty(handleDragOver).call(handleDragOver, this), false);
    this.dom.center.addEventListener("drop", _bindInstanceProperty(handleDrop).call(handleDrop, this), false);
    this.customTimes = [];

    // store state information needed for touch events
    this.touch = {};
    this.redrawCount = 0;
    this.initialDrawDone = false;
    this.initialRangeChangeDone = false;

    // attach the root panel to the provided container
    if (!container) throw new Error("No container provided");
    container.appendChild(this.dom.root);
    container.appendChild(this.dom.loadingScreen);
  }

  /**
   * Set options. Options will be passed to all components loaded in the Timeline.
   * @param {Object} [options]
   *                           {String} orientation
   *                              Vertical orientation for the Timeline,
   *                              can be 'bottom' (default) or 'top'.
   *                           {string | number} width
   *                              Width for the timeline, a number in pixels or
   *                              a css string like '1000px' or '75%'. '100%' by default.
   *                           {string | number} height
   *                              Fixed height for the Timeline, a number in pixels or
   *                              a css string like '400px' or '75%'. If undefined,
   *                              The Timeline will automatically size such that
   *                              its contents fit.
   *                           {string | number} minHeight
   *                              Minimum height for the Timeline, a number in pixels or
   *                              a css string like '400px' or '75%'.
   *                           {string | number} maxHeight
   *                              Maximum height for the Timeline, a number in pixels or
   *                              a css string like '400px' or '75%'.
   *                           {number | Date | string} start
   *                              Start date for the visible window
   *                           {number | Date | string} end
   *                              End date for the visible window
   */
  setOptions(options) {
    var _context7;
    if (options) {
      // copy the known options
      const fields = ["width", "height", "minHeight", "maxHeight", "autoResize", "start", "end", "clickToUse", "dataAttributes", "hiddenDates", "locale", "locales", "moment", "preferZoom", "rtl", "zoomKey", "horizontalScroll", "horizontalScrollKey", "horizontalScrollInvert", "verticalScroll", "longSelectPressTime", "snap"];
      availableUtils.selectiveExtend(fields, this.options, options);
      this.dom.rollingModeBtn.style.visibility = "hidden";
      if (this.options.rtl) {
        this.dom.container.style.direction = "rtl";
        this.dom.backgroundVertical.className = "vis-panel vis-background vis-vertical-rtl";
      }
      if (this.options.verticalScroll) {
        if (this.options.rtl) {
          this.dom.rightContainer.className = "vis-panel vis-right vis-vertical-scroll";
        } else {
          this.dom.leftContainer.className = "vis-panel vis-left vis-vertical-scroll";
        }
      }
      if (typeof this.options.orientation !== "object") {
        this.options.orientation = {
          item: undefined,
          axis: undefined
        };
      }
      if ("orientation" in options) {
        if (typeof options.orientation === "string") {
          this.options.orientation = {
            item: options.orientation,
            axis: options.orientation
          };
        } else if (typeof options.orientation === "object") {
          if ("item" in options.orientation) {
            this.options.orientation.item = options.orientation.item;
          }
          if ("axis" in options.orientation) {
            this.options.orientation.axis = options.orientation.axis;
          }
        }
      }
      if (this.options.orientation.axis === "both") {
        if (!this.timeAxis2) {
          const timeAxis2 = this.timeAxis2 = new TimeAxis(this.body, this.options);
          timeAxis2.setOptions = options => {
            const _options = options ? availableUtils.extend({}, options) : {};
            _options.orientation = "top"; // override the orientation option, always top
            TimeAxis.prototype.setOptions.call(timeAxis2, _options);
          };
          this.components.push(timeAxis2);
        }
      } else {
        if (this.timeAxis2) {
          var _context5;
          const index = _indexOfInstanceProperty(_context5 = this.components).call(_context5, this.timeAxis2);
          if (index !== -1) {
            var _context6;
            _spliceInstanceProperty(_context6 = this.components).call(_context6, index, 1);
          }
          this.timeAxis2.destroy();
          this.timeAxis2 = null;
        }
      }

      // if the graph2d's drawPoints is a function delegate the callback to the onRender property
      if (typeof options.drawPoints == "function") {
        options.drawPoints = {
          onRender: options.drawPoints
        };
      }
      if ("hiddenDates" in this.options) {
        convertHiddenOptions(this.options.moment, this.body, this.options.hiddenDates);
      }
      if ("clickToUse" in options) {
        if (options.clickToUse) {
          if (!this.activator) {
            this.activator = new Activator(this.dom.root);
          }
        } else {
          if (this.activator) {
            this.activator.destroy();
            delete this.activator;
          }
        }
      }

      // enable/disable autoResize
      this._initAutoResize();
    }

    // propagate options to all components
    _forEachInstanceProperty(_context7 = this.components).call(_context7, component => component.setOptions(options));

    // enable/disable configure
    if ("configure" in options) {
      var _context8;
      if (!this.configurator) {
        this.configurator = this._createConfigurator();
      }
      this.configurator.setOptions(options.configure);

      // collect the settings of all components, and pass them to the configuration system
      const appliedOptions = availableUtils.deepExtend({}, this.options);
      _forEachInstanceProperty(_context8 = this.components).call(_context8, component => {
        availableUtils.deepExtend(appliedOptions, component.options);
      });
      this.configurator.setModuleOptions({
        global: appliedOptions
      });
    }
    this._redraw();
  }

  /**
   * Returns true when the Timeline is active.
   * @returns {boolean}
   */
  isActive() {
    return !this.activator || this.activator.active;
  }

  /**
   * Destroy the Core, clean up all DOM elements and event listeners.
   */
  destroy() {
    var _context9;
    // unbind datasets
    this.setItems(null);
    this.setGroups(null);

    // remove all event listeners
    this.off();

    // stop checking for changed size
    this._stopAutoResize();

    // remove from DOM
    if (this.dom.root.parentNode) {
      this.dom.root.parentNode.removeChild(this.dom.root);
    }
    this.dom = null;

    // remove Activator
    if (this.activator) {
      this.activator.destroy();
      delete this.activator;
    }

    // cleanup hammer touch events
    for (const event in this.timelineListeners) {
      if (Object.prototype.hasOwnProperty.call(this.timelineListeners, event)) {
        delete this.timelineListeners[event];
      }
    }
    this.timelineListeners = null;
    this.hammer && this.hammer.destroy();
    this.hammer = null;

    // give all components the opportunity to cleanup
    _forEachInstanceProperty(_context9 = this.components).call(_context9, component => component.destroy());
    this.body = null;
  }

  /**
   * Set a custom time bar
   * @param {Date} time
   * @param {number} [id=undefined] Optional id of the custom time bar to be adjusted.
   */
  setCustomTime(time, id) {
    var _context0;
    const customTimes = _filterInstanceProperty(_context0 = this.customTimes).call(_context0, component => id === component.options.id);
    if (customTimes.length === 0) {
      throw new Error("No custom time bar found with id ".concat(_JSON$stringify(id)));
    }
    if (customTimes.length > 0) {
      customTimes[0].setCustomTime(time);
    }
  }

  /**
   * Retrieve the current custom time.
   * @param {number} [id=undefined]    Id of the custom time bar.
   * @return {Date | undefined} customTime
   */
  getCustomTime(id) {
    var _context1;
    const customTimes = _filterInstanceProperty(_context1 = this.customTimes).call(_context1, component => component.options.id === id);
    if (customTimes.length === 0) {
      throw new Error("No custom time bar found with id ".concat(_JSON$stringify(id)));
    }
    return customTimes[0].getCustomTime();
  }

  /**
   * Set a custom marker for the custom time bar.
   * @param {string} [title] Title of the custom marker.
   * @param {number} [id=undefined] Id of the custom marker.
   * @param {boolean} [editable=false] Make the custom marker editable.
   */
  setCustomTimeMarker(title, id, editable) {
    var _context10;
    const customTimes = _filterInstanceProperty(_context10 = this.customTimes).call(_context10, component => component.options.id === id);
    if (customTimes.length === 0) {
      throw new Error("No custom time bar found with id ".concat(_JSON$stringify(id)));
    }
    if (customTimes.length > 0) {
      customTimes[0].setCustomMarker(title, editable);
    }
  }

  /**
   * Set a custom title for the custom time bar.
   * @param {string} [title] Custom title
   * @param {number} [id=undefined]    Id of the custom time bar.
   * @returns {*}
   */
  setCustomTimeTitle(title, id) {
    var _context11;
    const customTimes = _filterInstanceProperty(_context11 = this.customTimes).call(_context11, component => component.options.id === id);
    if (customTimes.length === 0) {
      throw new Error("No custom time bar found with id ".concat(_JSON$stringify(id)));
    }
    if (customTimes.length > 0) {
      return customTimes[0].setCustomTitle(title);
    }
  }

  /**
   * Retrieve meta information from an event.
   * Should be overridden by classes extending Core
   * @param {Event} event
   * @return {Object} An object with related information.
   */
  getEventProperties(event) {
    return {
      event
    };
  }

  /**
   * Add custom vertical bar
   * @param {Date | string | number} [time]  A Date, unix timestamp, or
   *                                         ISO date string. Time point where
   *                                         the new bar should be placed.
   *                                         If not provided, `new Date()` will
   *                                         be used.
   * @param {number | string} [id=undefined] Id of the new bar. Optional
   * @return {number | string}               Returns the id of the new bar
   */
  addCustomTime(time, id) {
    var _context12;
    const timestamp = time !== undefined ? availableUtils.convert(time, "Date") : new Date();
    const exists = _someInstanceProperty(_context12 = this.customTimes).call(_context12, customTime => customTime.options.id === id);
    if (exists) {
      throw new Error("A custom time with id ".concat(_JSON$stringify(id), " already exists"));
    }
    const customTime = new CustomTime(this.body, availableUtils.extend({}, this.options, {
      time: timestamp,
      id,
      snap: this.itemSet ? this.itemSet.options.snap : this.options.snap
    }));
    this.customTimes.push(customTime);
    this.components.push(customTime);
    this._redraw();
    return id;
  }

  /**
   * Remove previously added custom bar
   * @param {int} id ID of the custom bar to be removed
   * [at]returns {boolean} True if the bar exists and is removed, false otherwise
   */
  removeCustomTime(id) {
    var _context13;
    const customTimes = _filterInstanceProperty(_context13 = this.customTimes).call(_context13, bar => bar.options.id === id);
    if (customTimes.length === 0) {
      throw new Error("No custom time bar found with id ".concat(_JSON$stringify(id)));
    }
    _forEachInstanceProperty(customTimes).call(customTimes, customTime => {
      var _context14, _context15, _context16, _context17;
      _spliceInstanceProperty(_context14 = this.customTimes).call(_context14, _indexOfInstanceProperty(_context15 = this.customTimes).call(_context15, customTime), 1);
      _spliceInstanceProperty(_context16 = this.components).call(_context16, _indexOfInstanceProperty(_context17 = this.components).call(_context17, customTime), 1);
      customTime.destroy();
    });
  }

  /**
   * Get the id's of the currently visible items.
   * @returns {Array} The ids of the visible items
   */
  getVisibleItems() {
    return this.itemSet && this.itemSet.getVisibleItems() || [];
  }

  /**
   * Get the id's of the items at specific time, where a click takes place on the timeline.
   * @param {Date} timeOfEvent The point in time to query items.
   * @returns {Array} The ids of all items in existence at the time of event.
   */
  getItemsAtCurrentTime(timeOfEvent) {
    this.time = timeOfEvent;
    return this.itemSet && this.itemSet.getItemsAtCurrentTime(this.time) || [];
  }

  /**
   * Get the id's of the currently visible groups.
   * @returns {Array} The ids of the visible groups
   */
  getVisibleGroups() {
    return this.itemSet && this.itemSet.getVisibleGroups() || [];
  }

  /**
   * Set Core window such that it fits all items
   * @param {Object} [options]  Available options:
   *                                `animation: boolean | {duration: number, easingFunction: string}`
   *                                    If true (default), the range is animated
   *                                    smoothly to the new window. An object can be
   *                                    provided to specify duration and easing function.
   *                                    Default duration is 500 ms, and default easing
   *                                    function is 'easeInOutQuad'.
   * @param {function} [callback] a callback funtion to be executed at the end of this function
   */
  fit(options, callback) {
    const range = this.getDataRange();

    // skip range set if there is no min and max date
    if (range.min === null && range.max === null) {
      return;
    }

    // apply a margin of 1% left and right of the data
    const interval = range.max - range.min;
    const min = new Date(range.min.valueOf() - interval * 0.01);
    const max = new Date(range.max.valueOf() + interval * 0.01);
    const animation = options && options.animation !== undefined ? options.animation : true;
    this.range.setRange(min, max, {
      animation
    }, callback);
  }

  /**
   * Calculate the data range of the items start and end dates
   * [at]returns {{min: [Date], max: [Date]}}
   * @protected
   */
  getDataRange() {
    // must be implemented by Timeline and Graph2d
    throw new Error("Cannot invoke abstract method getDataRange");
  }

  /**
   * Set the visible window. Both parameters are optional, you can change only
   * start or only end. Syntax:
   *
   *     TimeLine.setWindow(start, end)
   *     TimeLine.setWindow(start, end, options)
   *     TimeLine.setWindow(range)
   *
   * Where start and end can be a Date, number, or string, and range is an
   * object with properties start and end.
   *
   * @param {Date | number | string | Object} [start] Start date of visible window
   * @param {Date | number | string} [end]            End date of visible window
   * @param {Object} [options]  Available options:
   *                                `animation: boolean | {duration: number, easingFunction: string}`
   *                                    If true (default), the range is animated
   *                                    smoothly to the new window. An object can be
   *                                    provided to specify duration and easing function.
   *                                    Default duration is 500 ms, and default easing
   *                                    function is 'easeInOutQuad'.
   * @param {function} [callback] a callback funtion to be executed at the end of this function
   */
  setWindow(start, end, options, callback) {
    if (typeof arguments[2] == "function") {
      callback = arguments[2];
      options = {};
    }
    let animation;
    let range;
    if (arguments.length == 1) {
      range = arguments[0];
      animation = range.animation !== undefined ? range.animation : true;
      this.range.setRange(range.start, range.end, {
        animation
      });
    } else if (arguments.length == 2 && typeof arguments[1] == "function") {
      range = arguments[0];
      callback = arguments[1];
      animation = range.animation !== undefined ? range.animation : true;
      this.range.setRange(range.start, range.end, {
        animation
      }, callback);
    } else {
      animation = options && options.animation !== undefined ? options.animation : true;
      this.range.setRange(start, end, {
        animation
      }, callback);
    }
  }

  /**
   * Move the window such that given time is centered on screen.
   * @param {Date | number | string} time
   * @param {Object} [options]  Available options:
   *                                `animation: boolean | {duration: number, easingFunction: string}`
   *                                    If true (default), the range is animated
   *                                    smoothly to the new window. An object can be
   *                                    provided to specify duration and easing function.
   *                                    Default duration is 500 ms, and default easing
   *                                    function is 'easeInOutQuad'.
   * @param {function} [callback] a callback funtion to be executed at the end of this function
   */
  moveTo(time, options, callback) {
    if (typeof arguments[1] == "function") {
      callback = arguments[1];
      options = {};
    }
    const interval = this.range.end - this.range.start;
    const t = availableUtils.convert(time, "Date").valueOf();
    const start = t - interval / 2;
    const end = t + interval / 2;
    const animation = options && options.animation !== undefined ? options.animation : true;
    this.range.setRange(start, end, {
      animation
    }, callback);
  }

  /**
   * Get the visible window
   * @return {{start: Date, end: Date}}   Visible range
   */
  getWindow() {
    const range = this.range.getRange();
    return {
      start: new Date(range.start),
      end: new Date(range.end)
    };
  }

  /**
   * Zoom in the window such that given time is centered on screen.
   * @param {number} percentage - must be between [0..1]
   * @param {Object} [options]  Available options:
   *                                `animation: boolean | {duration: number, easingFunction: string}`
   *                                    If true (default), the range is animated
   *                                    smoothly to the new window. An object can be
   *                                    provided to specify duration and easing function.
   *                                    Default duration is 500 ms, and default easing
   *                                    function is 'easeInOutQuad'.
   * @param {function} [callback] a callback funtion to be executed at the end of this function
   */
  zoomIn(percentage, options, callback) {
    if (!percentage || percentage < 0 || percentage > 1) return;
    if (typeof arguments[1] == "function") {
      callback = arguments[1];
      options = {};
    }
    const range = this.getWindow();
    const start = range.start.valueOf();
    const end = range.end.valueOf();
    const interval = end - start;
    const newInterval = interval / (1 + percentage);
    const distance = (interval - newInterval) / 2;
    const newStart = start + distance;
    const newEnd = end - distance;
    this.setWindow(newStart, newEnd, options, callback);
  }

  /**
   * Zoom out the window such that given time is centered on screen.
   * @param {number} percentage - must be between [0..1]
   * @param {Object} [options]  Available options:
   *                                `animation: boolean | {duration: number, easingFunction: string}`
   *                                    If true (default), the range is animated
   *                                    smoothly to the new window. An object can be
   *                                    provided to specify duration and easing function.
   *                                    Default duration is 500 ms, and default easing
   *                                    function is 'easeInOutQuad'.
   * @param {function} [callback] a callback funtion to be executed at the end of this function
   */
  zoomOut(percentage, options, callback) {
    if (!percentage || percentage < 0 || percentage > 1) return;
    if (typeof arguments[1] == "function") {
      callback = arguments[1];
      options = {};
    }
    const range = this.getWindow();
    const start = range.start.valueOf();
    const end = range.end.valueOf();
    const interval = end - start;
    const newStart = start - interval * percentage / 2;
    const newEnd = end + interval * percentage / 2;
    this.setWindow(newStart, newEnd, options, callback);
  }

  /**
   * Force a redraw. Can be overridden by implementations of Core
   *
   * Note: this function will be overridden on construction with a trottled version
   */
  redraw() {
    this._redraw();
  }

  /**
   * Redraw for internal use. Redraws all components. See also the public
   * method redraw.
   * @protected
   */
  _redraw() {
    var _context18;
    this.redrawCount++;
    const dom = this.dom;
    if (!dom || !dom.container || dom.root.offsetWidth == 0) return; // when destroyed, or invisible

    let resized = false;
    const options = this.options;
    const props = this.props;
    updateHiddenDates(this.options.moment, this.body, this.options.hiddenDates);

    // update class names
    if (options.orientation == "top") {
      availableUtils.addClassName(dom.root, "vis-top");
      availableUtils.removeClassName(dom.root, "vis-bottom");
    } else {
      availableUtils.removeClassName(dom.root, "vis-top");
      availableUtils.addClassName(dom.root, "vis-bottom");
    }
    if (options.rtl) {
      availableUtils.addClassName(dom.root, "vis-rtl");
      availableUtils.removeClassName(dom.root, "vis-ltr");
    } else {
      availableUtils.addClassName(dom.root, "vis-ltr");
      availableUtils.removeClassName(dom.root, "vis-rtl");
    }

    // update root width and height options
    dom.root.style.maxHeight = availableUtils.option.asSize(options.maxHeight, "");
    dom.root.style.minHeight = availableUtils.option.asSize(options.minHeight, "");
    dom.root.style.width = availableUtils.option.asSize(options.width, "");
    const rootOffsetWidth = dom.root.offsetWidth;

    // calculate border widths
    props.border.left = 1;
    props.border.right = 1;
    props.border.top = 1;
    props.border.bottom = 1;

    // calculate the heights. If any of the side panels is empty, we set the height to
    // minus the border width, such that the border will be invisible
    props.center.height = dom.center.offsetHeight;
    props.left.height = dom.left.offsetHeight;
    props.right.height = dom.right.offsetHeight;
    props.top.height = dom.top.clientHeight || -props.border.top;
    props.bottom.height = Math.round(dom.bottom.getBoundingClientRect().height) || dom.bottom.clientHeight || -props.border.bottom;

    // TODO: compensate borders when any of the panels is empty.

    // apply auto height
    // TODO: only calculate autoHeight when needed (else we cause an extra reflow/repaint of the DOM)
    const contentHeight = Math.max(props.left.height, props.center.height, props.right.height);
    const autoHeight = props.top.height + contentHeight + props.bottom.height + props.border.top + props.border.bottom;
    dom.root.style.height = availableUtils.option.asSize(options.height, "".concat(autoHeight, "px"));

    // calculate heights of the content panels
    props.root.height = dom.root.offsetHeight;
    props.background.height = props.root.height;
    const containerHeight = props.root.height - props.top.height - props.bottom.height;
    props.centerContainer.height = containerHeight;
    props.leftContainer.height = containerHeight;
    props.rightContainer.height = props.leftContainer.height;

    // calculate the widths of the panels
    props.root.width = rootOffsetWidth;
    props.background.width = props.root.width;
    if (!this.initialDrawDone) {
      props.scrollbarWidth = availableUtils.getScrollBarWidth();
    }
    const leftContainerClientWidth = dom.leftContainer.clientWidth;
    const rightContainerClientWidth = dom.rightContainer.clientWidth;
    if (options.verticalScroll) {
      if (options.rtl) {
        props.left.width = leftContainerClientWidth || -props.border.left;
        props.right.width = rightContainerClientWidth + props.scrollbarWidth || -props.border.right;
      } else {
        props.left.width = leftContainerClientWidth + props.scrollbarWidth || -props.border.left;
        props.right.width = rightContainerClientWidth || -props.border.right;
      }
    } else {
      props.left.width = leftContainerClientWidth || -props.border.left;
      props.right.width = rightContainerClientWidth || -props.border.right;
    }
    this._setDOM();

    // update the scrollTop, feasible range for the offset can be changed
    // when the height of the Core or of the contents of the center changed
    let offset = this._updateScrollTop();

    // reposition the scrollable contents
    if (options.orientation.item != "top") {
      offset += Math.max(props.centerContainer.height - props.center.height - props.border.top - props.border.bottom, 0);
    }
    dom.center.style.transform = "translateY(".concat(offset, "px)");

    // show shadows when vertical scrolling is available
    const visibilityTop = props.scrollTop == 0 ? "hidden" : "";
    const visibilityBottom = props.scrollTop == props.scrollTopMin ? "hidden" : "";
    dom.shadowTop.style.visibility = visibilityTop;
    dom.shadowBottom.style.visibility = visibilityBottom;
    dom.shadowTopLeft.style.visibility = visibilityTop;
    dom.shadowBottomLeft.style.visibility = visibilityBottom;
    dom.shadowTopRight.style.visibility = visibilityTop;
    dom.shadowBottomRight.style.visibility = visibilityBottom;
    if (options.verticalScroll) {
      dom.rightContainer.className = "vis-panel vis-right vis-vertical-scroll";
      dom.leftContainer.className = "vis-panel vis-left vis-vertical-scroll";
      dom.shadowTopRight.style.visibility = "hidden";
      dom.shadowBottomRight.style.visibility = "hidden";
      dom.shadowTopLeft.style.visibility = "hidden";
      dom.shadowBottomLeft.style.visibility = "hidden";
      dom.left.style.top = "0px";
      dom.right.style.top = "0px";
    }
    if (!options.verticalScroll || props.center.height < props.centerContainer.height) {
      dom.left.style.top = "".concat(offset, "px");
      dom.right.style.top = "".concat(offset, "px");
      dom.rightContainer.className = dom.rightContainer.className.replace(new RegExp("(?:^|\\s)" + "vis-vertical-scroll" + "(?:\\s|$)"), " ");
      dom.leftContainer.className = dom.leftContainer.className.replace(new RegExp("(?:^|\\s)" + "vis-vertical-scroll" + "(?:\\s|$)"), " ");
      props.left.width = leftContainerClientWidth || -props.border.left;
      props.right.width = rightContainerClientWidth || -props.border.right;
      this._setDOM();
    }

    // enable/disable vertical panning
    const contentsOverflow = props.center.height > props.centerContainer.height;
    this.hammer.get("pan").set({
      direction: contentsOverflow ? Hammer.DIRECTION_ALL : Hammer.DIRECTION_HORIZONTAL
    });

    // set the long press time
    this.hammer.get("press").set({
      time: this.options.longSelectPressTime
    });

    // redraw all components
    _forEachInstanceProperty(_context18 = this.components).call(_context18, component => {
      resized = component.redraw() || resized;
    });
    const MAX_REDRAW = 5;
    if (resized) {
      if (this.redrawCount < MAX_REDRAW) {
        this.body.emitter.emit("_change");
        return;
      } else {
        console.log("WARNING: infinite loop in redraw?");
      }
    } else {
      this.redrawCount = 0;
    }

    //Emit public 'changed' event for UI updates, see issue #1592
    this.body.emitter.emit("changed");
  }

  /**
   * sets the basic DOM components needed for the timeline\graph2d
   */
  _setDOM() {
    const props = this.props;
    const dom = this.dom;
    props.leftContainer.width = props.left.width;
    props.rightContainer.width = props.right.width;
    const centerWidth = props.root.width - props.left.width - props.right.width;
    props.center.width = centerWidth;
    props.centerContainer.width = centerWidth;
    props.top.width = centerWidth;
    props.bottom.width = centerWidth;

    // resize the panels
    dom.background.style.height = "".concat(props.background.height, "px");
    dom.backgroundVertical.style.height = "".concat(props.background.height, "px");
    dom.backgroundHorizontal.style.height = "".concat(props.centerContainer.height, "px");
    dom.centerContainer.style.height = "".concat(props.centerContainer.height, "px");
    dom.leftContainer.style.height = "".concat(props.leftContainer.height, "px");
    dom.rightContainer.style.height = "".concat(props.rightContainer.height, "px");
    dom.background.style.width = "".concat(props.background.width, "px");
    dom.backgroundVertical.style.width = "".concat(props.centerContainer.width, "px");
    dom.backgroundHorizontal.style.width = "".concat(props.background.width, "px");
    dom.centerContainer.style.width = "".concat(props.center.width, "px");
    dom.top.style.width = "".concat(props.top.width, "px");
    dom.bottom.style.width = "".concat(props.bottom.width, "px");

    // reposition the panels
    dom.background.style.left = "0";
    dom.background.style.top = "0";
    dom.backgroundVertical.style.left = "".concat(props.left.width + props.border.left, "px");
    dom.backgroundVertical.style.top = "0";
    dom.backgroundHorizontal.style.left = "0";
    dom.backgroundHorizontal.style.top = "".concat(props.top.height, "px");
    dom.centerContainer.style.left = "".concat(props.left.width, "px");
    dom.centerContainer.style.top = "".concat(props.top.height, "px");
    dom.leftContainer.style.left = "0";
    dom.leftContainer.style.top = "".concat(props.top.height, "px");
    dom.rightContainer.style.left = "".concat(props.left.width + props.center.width, "px");
    dom.rightContainer.style.top = "".concat(props.top.height, "px");
    dom.top.style.left = "".concat(props.left.width, "px");
    dom.top.style.top = "0";
    dom.bottom.style.left = "".concat(props.left.width, "px");
    dom.bottom.style.top = "".concat(props.top.height + props.centerContainer.height, "px");
    dom.center.style.left = "0";
    dom.left.style.left = "0";
    dom.right.style.left = "0";
  }

  /**
   * Set a current time. This can be used for example to ensure that a client's
   * time is synchronized with a shared server time.
   * Only applicable when option `showCurrentTime` is true.
   * @param {Date | string | number} time     A Date, unix timestamp, or
   *                                          ISO date string.
   */
  setCurrentTime(time) {
    if (!this.currentTime) {
      throw new Error("Option showCurrentTime must be true");
    }
    this.currentTime.setCurrentTime(time);
  }

  /**
   * Get the current time.
   * Only applicable when option `showCurrentTime` is true.
   * @return {Date} Returns the current time.
   */
  getCurrentTime() {
    if (!this.currentTime) {
      throw new Error("Option showCurrentTime must be true");
    }
    return this.currentTime.getCurrentTime();
  }

  /**
   * Convert a position on screen (pixels) to a datetime
   * @param {int}     x    Position on the screen in pixels
   * @return {Date}   time The datetime the corresponds with given position x
   * @protected
   * TODO: move this function to Range
   */
  _toTime(x) {
    return toTime(this, x, this.props.center.width);
  }

  /**
   * Convert a position on the global screen (pixels) to a datetime
   * @param {int}     x    Position on the screen in pixels
   * @return {Date}   time The datetime the corresponds with given position x
   * @protected
   * TODO: move this function to Range
   */
  _toGlobalTime(x) {
    return toTime(this, x, this.props.root.width);
    //var conversion = this.range.conversion(this.props.root.width);
    //return new Date(x / conversion.scale + conversion.offset);
  }

  /**
   * Convert a datetime (Date object) into a position on the screen
   * @param {Date}   time A date
   * @return {int}   x    The position on the screen in pixels which corresponds
   *                      with the given date.
   * @protected
   * TODO: move this function to Range
   */
  _toScreen(time) {
    return toScreen(this, time, this.props.center.width);
  }

  /**
   * Convert a datetime (Date object) into a position on the root
   * This is used to get the pixel density estimate for the screen, not the center panel
   * @param {Date}   time A date
   * @return {int}   x    The position on root in pixels which corresponds
   *                      with the given date.
   * @protected
   * TODO: move this function to Range
   */
  _toGlobalScreen(time) {
    return toScreen(this, time, this.props.root.width);
    //var conversion = this.range.conversion(this.props.root.width);
    //return (time.valueOf() - conversion.offset) * conversion.scale;
  }

  /**
   * Initialize watching when option autoResize is true
   * @private
   */
  _initAutoResize() {
    if (this.options.autoResize == true) {
      this._startAutoResize();
    } else {
      this._stopAutoResize();
    }
  }

  /**
   * Watch for changes in the size of the container. On resize, the Panel will
   * automatically redraw itself.
   * @private
   */
  _startAutoResize() {
    const me = this;
    this._stopAutoResize();
    this._onResize = () => {
      if (me.options.autoResize != true) {
        // stop watching when the option autoResize is changed to false
        me._stopAutoResize();
        return;
      }
      if (me.dom.root) {
        const rootOffsetHeight = me.dom.root.offsetHeight;
        const rootOffsetWidth = me.dom.root.offsetWidth;
        // check whether the frame is resized
        // Note: we compare offsetWidth here, not clientWidth. For some reason,
        // IE does not restore the clientWidth from 0 to the actual width after
        // changing the timeline's container display style from none to visible
        if (rootOffsetWidth != me.props.lastWidth || rootOffsetHeight != me.props.lastHeight) {
          me.props.lastWidth = rootOffsetWidth;
          me.props.lastHeight = rootOffsetHeight;
          me.props.scrollbarWidth = availableUtils.getScrollBarWidth();
          me.body.emitter.emit("_change");
        }
      }
    };

    // add event listener to window resize
    window.addEventListener("resize", this._onResize);

    //Prevent initial unnecessary redraw
    if (me.dom.root) {
      me.props.lastWidth = me.dom.root.offsetWidth;
      me.props.lastHeight = me.dom.root.offsetHeight;
    }
    this.watchTimer = _setInterval(this._onResize, 1000);
  }

  /**
   * Stop watching for a resize of the frame.
   * @private
   */
  _stopAutoResize() {
    if (this.watchTimer) {
      clearInterval(this.watchTimer);
      this.watchTimer = undefined;
    }

    // remove event listener on window.resize
    if (this._onResize) {
      window.removeEventListener("resize", this._onResize);
      this._onResize = null;
    }
  }

  /**
   * Start moving the timeline vertically
   * @private
   */
  _onTouch() {
    this.touch.allowDragging = true;
    this.touch.initialScrollTop = this.props.scrollTop;
  }

  /**
   * Start moving the timeline vertically
   * @private
   */
  _onPinch() {
    this.touch.allowDragging = false;
  }

  /**
   * Move the timeline vertically
   * @param {Event} event
   * @private
   */
  _onDrag(event) {
    if (!event) return;
    // refuse to drag when we where pinching to prevent the timeline make a jump
    // when releasing the fingers in opposite order from the touch screen
    if (!this.touch.allowDragging) return;
    const delta = event.deltaY;
    const oldScrollTop = this._getScrollTop();
    const newScrollTop = this._setScrollTop(this.touch.initialScrollTop + delta);
    if (this.options.verticalScroll) {
      this.dom.left.parentNode.scrollTop = -this.props.scrollTop;
      this.dom.right.parentNode.scrollTop = -this.props.scrollTop;
    }
    if (newScrollTop != oldScrollTop) {
      this.emit("verticalDrag");
    }
  }

  /**
   * Apply a scrollTop
   * @param {number} scrollTop
   * @returns {number} scrollTop  Returns the applied scrollTop
   * @private
   */
  _setScrollTop(scrollTop) {
    this.props.scrollTop = scrollTop;
    this._updateScrollTop();
    return this.props.scrollTop;
  }

  /**
   * Update the current scrollTop when the height of  the containers has been changed
   * @returns {number} scrollTop  Returns the applied scrollTop
   * @private
   */
  _updateScrollTop() {
    // recalculate the scrollTopMin
    const scrollTopMin = Math.min(this.props.centerContainer.height - this.props.border.top - this.props.border.bottom - this.props.center.height, 0); // is negative or zero
    if (scrollTopMin != this.props.scrollTopMin) {
      // in case of bottom orientation, change the scrollTop such that the contents
      // do not move relative to the time axis at the bottom
      if (this.options.orientation.item != "top") {
        this.props.scrollTop += scrollTopMin - this.props.scrollTopMin;
      }
      this.props.scrollTopMin = scrollTopMin;
    }

    // limit the scrollTop to the feasible scroll range
    if (this.props.scrollTop > 0) this.props.scrollTop = 0;
    if (this.props.scrollTop < scrollTopMin) this.props.scrollTop = scrollTopMin;
    if (this.options.verticalScroll) {
      this.dom.left.parentNode.scrollTop = -this.props.scrollTop;
      this.dom.right.parentNode.scrollTop = -this.props.scrollTop;
    }
    return this.props.scrollTop;
  }

  /**
   * Get the current scrollTop
   * @returns {number} scrollTop
   * @private
   */
  _getScrollTop() {
    return this.props.scrollTop;
  }

  /**
   * Load a configurator
   * [at]returns {Object}
   * @private
   */
  _createConfigurator() {
    throw new Error("Cannot invoke abstract method _createConfigurator");
  }
}

// turn Core into an event emitter
Emitter(Core.prototype);

/**
 * A current time bar
 */
class CurrentTime extends Component {
  /**
   * @param {{range: Range, dom: Object, domProps: Object}} body
   * @param {Object} [options]        Available parameters:
   *                                  {Boolean} [showCurrentTime]
   *                                  {String}  [alignCurrentTime]
   * @constructor CurrentTime
   * @extends Component
   */
  constructor(body, options) {
    var _context;
    super();
    this.body = body;

    // default options
    this.defaultOptions = {
      rtl: false,
      showCurrentTime: true,
      alignCurrentTime: undefined,
      moment: moment$2,
      locales,
      locale: "en"
    };
    this.options = availableUtils.extend({}, this.defaultOptions);
    this.setOptions(options);
    this.options.locales = availableUtils.extend({}, locales, this.options.locales);
    const defaultLocales = this.defaultOptions.locales[this.defaultOptions.locale];
    _forEachInstanceProperty(_context = _Object$keys(this.options.locales)).call(_context, locale => {
      this.options.locales[locale] = availableUtils.extend({}, defaultLocales, this.options.locales[locale]);
    });
    this.offset = 0;
    this._create();
  }

  /**
   * Create the HTML DOM for the current time bar
   * @private
   */
  _create() {
    const bar = document.createElement("div");
    bar.className = "vis-current-time";
    bar.style.position = "absolute";
    bar.style.top = "0px";
    bar.style.height = "100%";
    this.bar = bar;
  }

  /**
   * Destroy the CurrentTime bar
   */
  destroy() {
    this.options.showCurrentTime = false;
    this.redraw(); // will remove the bar from the DOM and stop refreshing

    this.body = null;
  }

  /**
   * Set options for the component. Options will be merged in current options.
   * @param {Object} options  Available parameters:
   *                          {boolean} [showCurrentTime]
   *                          {String}  [alignCurrentTime]
   */
  setOptions(options) {
    if (options) {
      // copy all options that we know
      availableUtils.selectiveExtend(["rtl", "showCurrentTime", "alignCurrentTime", "moment", "locale", "locales"], this.options, options);
    }
  }

  /**
   * Repaint the component
   * @return {boolean} Returns true if the component is resized
   */
  redraw() {
    if (this.options.showCurrentTime) {
      var _context2, _context3;
      const parent = this.body.dom.backgroundVertical;
      if (this.bar.parentNode != parent) {
        // attach to the dom
        if (this.bar.parentNode) {
          this.bar.parentNode.removeChild(this.bar);
        }
        parent.appendChild(this.bar);
        this.start();
      }
      let now = this.options.moment(_Date$now() + this.offset);
      if (this.options.alignCurrentTime) {
        now = now.startOf(this.options.alignCurrentTime);
      }
      const x = this.body.util.toScreen(now);
      let locale = this.options.locales[this.options.locale];
      if (!locale) {
        if (!this.warned) {
          console.warn("WARNING: options.locales['".concat(this.options.locale, "'] not found. See https://visjs.github.io/vis-timeline/docs/timeline/#Localization"));
          this.warned = true;
        }
        locale = this.options.locales["en"]; // fall back on english when not available
      }
      let title = _concatInstanceProperty(_context2 = _concatInstanceProperty(_context3 = "".concat(locale.current, " ")).call(_context3, locale.time, ": ")).call(_context2, now.format("dddd, MMMM Do YYYY, H:mm:ss"));
      title = title.charAt(0).toUpperCase() + title.substring(1);
      if (this.options.rtl) {
        this.bar.style.transform = "translateX(".concat(x * -1, "px)");
      } else {
        this.bar.style.transform = "translateX(".concat(x, "px)");
      }
      this.bar.title = title;
    } else {
      // remove the line from the DOM
      if (this.bar.parentNode) {
        this.bar.parentNode.removeChild(this.bar);
      }
      this.stop();
    }
    return false;
  }

  /**
   * Start auto refreshing the current time bar
   */
  start() {
    const me = this;

    /**
     *  Updates the current time.
     */
    function update() {
      me.stop();

      // determine interval to refresh
      const scale = me.body.range.conversion(me.body.domProps.center.width).scale;
      let interval = 1 / scale / 10;
      if (interval < 30) interval = 30;
      if (interval > 1000) interval = 1000;
      me.redraw();
      me.body.emitter.emit("currentTimeTick");

      // start a renderTimer to adjust for the new time
      me.currentTimeTimer = _setTimeout(update, interval);
    }
    update();
  }

  /**
   * Stop auto refreshing the current time bar
   */
  stop() {
    if (this.currentTimeTimer !== undefined) {
      clearTimeout(this.currentTimeTimer);
      delete this.currentTimeTimer;
    }
  }

  /**
   * Set a current time. This can be used for example to ensure that a client's
   * time is synchronized with a shared server time.
   * @param {Date | string | number} time     A Date, unix timestamp, or
   *                                          ISO date string.
   */
  setCurrentTime(time) {
    const t = availableUtils.convert(time, "Date").valueOf();
    const now = _Date$now();
    this.offset = t - now;
    this.redraw();
  }

  /**
   * Get the current time.
   * @return {Date} Returns the current time.
   */
  getCurrentTime() {
    return new Date(_Date$now() + this.offset);
  }
}

var es_array_find = {};

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	var FIND = 'find';
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	// eslint-disable-next-line es/no-array-prototype-find -- testing
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	// `Array.prototype.find` method
	// https://tc39.es/ecma262/#sec-array.prototype.find
	$({ target: 'Array', proto: true, forced: SKIPS_HOLES }, {
	  find: function find(callbackfn /* , that = undefined */) {
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	  }
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	// https://tc39.es/ecma262/#sec-array.prototype-@@unscopables
	addToUnscopables(FIND);
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var find;
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function requireFind () {
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	var getOwnPropertyNamesModule = /*@__PURE__*/ requireObjectGetOwnPropertyNames();
	var getOwnPropertyNamesExternalModule = /*@__PURE__*/ requireObjectGetOwnPropertyNamesExternal();
	var isExtensible = /*@__PURE__*/ requireObjectIsExtensible();
	var uid = /*@__PURE__*/ requireUid();
	var FREEZING = /*@__PURE__*/ requireFreezing();

	var REQUIRED = false;
	var METADATA = uid('meta');
	var id = 0;

	var setMetadata = function (it) {
	  defineProperty(it, METADATA, { value: {
	    objectID: 'O' + id++, // object ID
	    weakData: {}          // weak collections IDs
	  } });
	};

	var fastKey = function (it, create) {
	  // return a primitive with prefix
	  if (!isObject(it)) return typeof it == 'symbol' ? it : (typeof it == 'string' ? 'S' : 'P') + it;
	  if (!hasOwn(it, METADATA)) {
	    // can't set metadata to uncaught frozen object
	    if (!isExtensible(it)) return 'F';
	    // not necessary to add metadata
	    if (!create) return 'E';
	    // add missing metadata
	    setMetadata(it);
	  // return object ID
	  } return it[METADATA].objectID;
	};

	var getWeakData = function (it, create) {
	  if (!hasOwn(it, METADATA)) {
	    // can't set metadata to uncaught frozen object
	    if (!isExtensible(it)) return true;
	    // not necessary to add metadata
	    if (!create) return false;
	    // add missing metadata
	    setMetadata(it);
	  // return the store of weak collections IDs
	  } return it[METADATA].weakData;
	};

	// add metadata on freeze-family methods calling
	var onFreeze = function (it) {
	  if (FREEZING && REQUIRED && isExtensible(it) && !hasOwn(it, METADATA)) setMetadata(it);
	  return it;
	};

	var enable = function () {
	  meta.enable = function () { /* empty */ };
	  REQUIRED = true;
	  var getOwnPropertyNames = getOwnPropertyNamesModule.f;
	  var splice = uncurryThis([].splice);
	  var test = {};
	  test[METADATA] = 1;

	  // prevent exposing of metadata key
	  if (getOwnPropertyNames(test).length) {
	    getOwnPropertyNamesModule.f = function (it) {
	      var result = getOwnPropertyNames(it);
	      for (var i = 0, length = result.length; i < length; i++) {
	        if (result[i] === METADATA) {
	          splice(result, i, 1);
	          break;
	        }
	      } return result;
	    };

	    $({ target: 'Object', stat: true, forced: true }, {
	      getOwnPropertyNames: getOwnPropertyNamesExternalModule.f
	    });
	  }
	};

	var meta = internalMetadata.exports = {
	  enable: enable,
	  fastKey: fastKey,
	  getWeakData: getWeakData,
	  onFreeze: onFreeze
	};

	hiddenKeys[METADATA] = true;
	return internalMetadata.exports;
}

var isArrayIteratorMethod;
var hasRequiredIsArrayIteratorMethod;

function requireIsArrayIteratorMethod () {
	if (hasRequiredIsArrayIteratorMethod) return isArrayIteratorMethod;
	hasRequiredIsArrayIteratorMethod = 1;
	var wellKnownSymbol = /*@__PURE__*/ requireWellKnownSymbol();
	var Iterators = /*@__PURE__*/ requireIterators();

	var ITERATOR = wellKnownSymbol('iterator');
	var ArrayPrototype = Array.prototype;

	// check on default Array iterator
	isArrayIteratorMethod = function (it) {
	  return it !== undefined && (Iterators.Array === it || ArrayPrototype[ITERATOR] === it);
	};
	return isArrayIteratorMethod;
}

var getIteratorMethod;
var hasRequiredGetIteratorMethod;

function requireGetIteratorMethod () {
	if (hasRequiredGetIteratorMethod) return getIteratorMethod;
	hasRequiredGetIteratorMethod = 1;
	var classof = /*@__PURE__*/ requireClassof();
	var getMethod = /*@__PURE__*/ requireGetMethod();
	var isNullOrUndefined = /*@__PURE__*/ requireIsNullOrUndefined();
	var Iterators = /*@__PURE__*/ requireIterators();
	var wellKnownSymbol = /*@__PURE__*/ requireWellKnownSymbol();

	var ITERATOR = wellKnownSymbol('iterator');

	getIteratorMethod = function (it) {
	  if (!isNullOrUndefined(it)) return getMethod(it, ITERATOR)
	    || getMethod(it, '@@iterator')
	    || Iterators[classof(it)];
	};
	return getIteratorMethod;
}

var getIterator;
var hasRequiredGetIterator;

function requireGetIterator () {
	if (hasRequiredGetIterator) return getIterator;
	hasRequiredGetIterator = 1;
	var call = /*@__PURE__*/ requireFunctionCall();
	var aCallable = /*@__PURE__*/ requireACallable();
	var anObject = /*@__PURE__*/ requireAnObject();
	var tryToString = /*@__PURE__*/ requireTryToString();
	var getIteratorMethod = /*@__PURE__*/ requireGetIteratorMethod();

	var $TypeError = TypeError;

	getIterator = function (argument, usingIterator) {
	  var iteratorMethod = arguments.length < 2 ? getIteratorMethod(argument) : usingIterator;
	  if (aCallable(iteratorMethod)) return anObject(call(iteratorMethod, argument));
	  throw new $TypeError(tryToString(argument) + ' is not iterable');
	};
	return getIterator;
}

var iteratorClose;
var hasRequiredIteratorClose;

function requireIteratorClose () {
	if (hasRequiredIteratorClose) return iteratorClose;
	hasRequiredIteratorClose = 1;
	var call = /*@__PURE__*/ requireFunctionCall();
	var anObject = /*@__PURE__*/ requireAnObject();
	var getMethod = /*@__PURE__*/ requireGetMethod();

	iteratorClose = function (iterator, kind, value) {
	  var innerResult, innerError;
	  anObject(iterator);
	  try {
	    innerResult = getMethod(iterator, 'return');
	    if (!innerResult) {
	      if (kind === 'throw') throw value;
	      return value;
	    }
	    innerResult = call(innerResult, iterator);
	  } catch (error) {
	    innerError = true;
	    innerResult = error;
	  }
	  if (kind === 'throw') throw value;
	  if (innerError) throw innerResult;
	  anObject(innerResult);
	  return value;
	};
	return iteratorClose;
}

var iterate;
var hasRequiredIterate;

function requireIterate () {
	if (hasRequiredIterate) return iterate;
	hasRequiredIterate = 1;
	var bind = /*@__PURE__*/ requireFunctionBindContext();
	var call = /*@__PURE__*/ requireFunctionCall();
	var anObject = /*@__PURE__*/ requireAnObject();
	var tryToString = /*@__PURE__*/ requireTryToString();
	var isArrayIteratorMethod = /*@__PURE__*/ requireIsArrayIteratorMethod();
	var lengthOfArrayLike = /*@__PURE__*/ requireLengthOfArrayLike();
	var isPrototypeOf = /*@__PURE__*/ requireObjectIsPrototypeOf();
	var getIterator = /*@__PURE__*/ requireGetIterator();
	var getIteratorMethod = /*@__PURE__*/ requireGetIteratorMethod();
	var iteratorClose = /*@__PURE__*/ requireIteratorClose();

	var $TypeError = TypeError;

	var Result = function (stopped, result) {
	  this.stopped = stopped;
	  this.result = result;
	};

	var ResultPrototype = Result.prototype;

	iterate = function (iterable, unboundFunction, options) {
	  var that = options && options.that;
	  var AS_ENTRIES = !!(options && options.AS_ENTRIES);
	  var IS_RECORD = !!(options && options.IS_RECORD);
	  var IS_ITERATOR = !!(options && options.IS_ITERATOR);
	  var INTERRUPTED = !!(options && options.INTERRUPTED);
	  var fn = bind(unboundFunction, that);
	  var iterator, iterFn, index, length, result, next, step;

	  var stop = function (condition) {
	    if (iterator) iteratorClose(iterator, 'normal');
	    return new Result(true, condition);
	  };

	  var callFn = function (value) {
	    if (AS_ENTRIES) {
	      anObject(value);
	      return INTERRUPTED ? fn(value[0], value[1], stop) : fn(value[0], value[1]);
	    } return INTERRUPTED ? fn(value, stop) : fn(value);
	  };

	  if (IS_RECORD) {
	    iterator = iterable.iterator;
	  } else if (IS_ITERATOR) {
	    iterator = iterable;
	  } else {
	    iterFn = getIteratorMethod(iterable);
	    if (!iterFn) throw new $TypeError(tryToString(iterable) + ' is not iterable');
	    // optimisation for array iterators
	    if (isArrayIteratorMethod(iterFn)) {
	      for (index = 0, length = lengthOfArrayLike(iterable); length > index; index++) {
	        result = callFn(iterable[index]);
	        if (result && isPrototypeOf(ResultPrototype, result)) return result;
	      } return new Result(false);
	    }
	    iterator = getIterator(iterable, iterFn);
	  }

	  next = IS_RECORD ? iterable.next : iterator.next;
	  while (!(step = call(next, iterator)).done) {
	    try {
	      result = callFn(step.value);
	    } catch (error) {
	      iteratorClose(iterator, 'throw', error);
	    }
	    if (typeof result == 'object' && result && isPrototypeOf(ResultPrototype, result)) return result;
	  } return new Result(false);
	};
	return iterate;
}

var anInstance;
var hasRequiredAnInstance;

function requireAnInstance () {
	if (hasRequiredAnInstance) return anInstance;
	hasRequiredAnInstance = 1;
	var isPrototypeOf = /*@__PURE__*/ requireObjectIsPrototypeOf();

	var $TypeError = TypeError;

	anInstance = function (it, Prototype) {
	  if (isPrototypeOf(Prototype, it)) return it;
	  throw new $TypeError('Incorrect invocation');
	};
	return anInstance;
}

var collection;
var hasRequiredCollection;

function requireCollection () {
	if (hasRequiredCollection) return collection;
	hasRequiredCollection = 1;
	var $ = /*@__PURE__*/ require_export();
	var globalThis = /*@__PURE__*/ requireGlobalThis();
	var InternalMetadataModule = /*@__PURE__*/ requireInternalMetadata();
	var fails = /*@__PURE__*/ requireFails();
	var createNonEnumerableProperty = /*@__PURE__*/ requireCreateNonEnumerableProperty();
	var iterate = /*@__PURE__*/ requireIterate();
	var anInstance = /*@__PURE__*/ requireAnInstance();
	var isCallable = /*@__PURE__*/ requireIsCallable();
	var isObject = /*@__PURE__*/ requireIsObject();
	var isNullOrUndefined = /*@__PURE__*/ requireIsNullOrUndefined();
	var setToStringTag = /*@__PURE__*/ requireSetToStringTag();
	var defineProperty = /*@__PURE__*/ requireObjectDefineProperty().f;
	var forEach = /*@__PURE__*/ requireArrayIteration().forEach;
	var DESCRIPTORS = /*@__PURE__*/ requireDescriptors();
	var InternalStateModule = /*@__PURE__*/ requireInternalState();

	var setInternalState = InternalStateModule.set;
	var internalStateGetterFor = InternalStateModule.getterFor;

	collection = function (CONSTRUCTOR_NAME, wrapper, common) {
	  var IS_MAP = CONSTRUCTOR_NAME.indexOf('Map') !== -1;
	  var IS_WEAK = CONSTRUCTOR_NAME.indexOf('Weak') !== -1;
	  var ADDER = IS_MAP ? 'set' : 'add';
	  var NativeConstructor = globalThis[CONSTRUCTOR_NAME];
	  var NativePrototype = NativeConstructor && NativeConstructor.prototype;
	  var exported = {};
	  var Constructor;

	  if (!DESCRIPTORS || !isCallable(NativeConstructor)
	    || !(IS_WEAK || NativePrototype.forEach && !fails(function () { new NativeConstructor().entries().next(); }))
	  ) {
	    // create collection constructor
	    Constructor = common.getConstructor(wrapper, CONSTRUCTOR_NAME, IS_MAP, ADDER);
	    InternalMetadataModule.enable();
	  } else {
	    Constructor = wrapper(function (target, iterable) {
	      setInternalState(anInstance(target, Prototype), {
	        type: CONSTRUCTOR_NAME,
	        collection: new NativeConstructor()
	      });
	      if (!isNullOrUndefined(iterable)) iterate(iterable, target[ADDER], { that: target, AS_ENTRIES: IS_MAP });
	    });

	    var Prototype = Constructor.prototype;

	    var getInternalState = internalStateGetterFor(CONSTRUCTOR_NAME);

	    forEach(['add', 'clear', 'delete', 'forEach', 'get', 'has', 'set', 'keys', 'values', 'entries'], function (KEY) {
	      var IS_ADDER = KEY === 'add' || KEY === 'set';
	      if (KEY in NativePrototype && !(IS_WEAK && KEY === 'clear')) {
	        createNonEnumerableProperty(Prototype, KEY, function (a, b) {
	          var collection = getInternalState(this).collection;
	          if (!IS_ADDER && IS_WEAK && !isObject(a)) return KEY === 'get' ? undefined : false;
	          var result = collection[KEY](a === 0 ? 0 : a, b);
	          return IS_ADDER ? this : result;
	        });
	      }
	    });

	    IS_WEAK || defineProperty(Prototype, 'size', {
	      configurable: true,
	      get: function () {
	        return getInternalState(this).collection.size;
	      }
	    });
	  }

	  setToStringTag(Constructor, CONSTRUCTOR_NAME, false, true);

	  exported[CONSTRUCTOR_NAME] = Constructor;
	  $({ global: true, forced: true }, exported);

	  if (!IS_WEAK) common.setStrong(Constructor, CONSTRUCTOR_NAME, IS_MAP);

	  return Constructor;
	};
	return collection;
}

var defineBuiltIns;
var hasRequiredDefineBuiltIns;

function requireDefineBuiltIns () {
	if (hasRequiredDefineBuiltIns) return defineBuiltIns;
	hasRequiredDefineBuiltIns = 1;
	var defineBuiltIn = /*@__PURE__*/ requireDefineBuiltIn();

	defineBuiltIns = function (target, src, options) {
	  for (var key in src) {
	    if (options && options.unsafe && target[key]) target[key] = src[key];
	    else defineBuiltIn(target, key, src[key], options);
	  } return target;
	};
	return defineBuiltIns;
}

var setSpecies;
var hasRequiredSetSpecies;

function requireSetSpecies () {
	if (hasRequiredSetSpecies) return setSpecies;
	hasRequiredSetSpecies = 1;
	var getBuiltIn = /*@__PURE__*/ requireGetBuiltIn();
	var defineBuiltInAccessor = /*@__PURE__*/ requireDefineBuiltInAccessor();
	var wellKnownSymbol = /*@__PURE__*/ requireWellKnownSymbol();
	var DESCRIPTORS = /*@__PURE__*/ requireDescriptors();

	var SPECIES = wellKnownSymbol('species');

	setSpecies = function (CONSTRUCTOR_NAME) {
	  var Constructor = getBuiltIn(CONSTRUCTOR_NAME);

	  if (DESCRIPTORS && Constructor && !Constructor[SPECIES]) {
	    defineBuiltInAccessor(Constructor, SPECIES, {
	      configurable: true,
	      get: function () { return this; }
	    });
	  }
	};
	return setSpecies;
}

var collectionStrong;
var hasRequiredCollectionStrong;

function requireCollectionStrong () {
	if (hasRequiredCollectionStrong) return collectionStrong;
	hasRequiredCollectionStrong = 1;
	var create = /*@__PURE__*/ requireObjectCreate();
	var defineBuiltInAccessor = /*@__PURE__*/ requireDefineBuiltInAccessor();
	var defineBuiltIns = /*@__PURE__*/ requireDefineBuiltIns();
	var bind = /*@__PURE__*/ requireFunctionBindContext();
	var anInstance = /*@__PURE__*/ requireAnInstance();
	var isNullOrUndefined = /*@__PURE__*/ requireIsNullOrUndefined();
	var iterate = /*@__PURE__*/ requireIterate();
	var defineIterator = /*@__PURE__*/ requireIteratorDefine();
	var createIterResultObject = /*@__PURE__*/ requireCreateIterResultObject();
	var setSpecies = /*@__PURE__*/ requireSetSpecies();
	var DESCRIPTORS = /*@__PURE__*/ requireDescriptors();
	var fastKey = /*@__PURE__*/ requireInternalMetadata().fastKey;
	var InternalStateModule = /*@__PURE__*/ requireInternalState();

	var setInternalState = InternalStateModule.set;
	var internalStateGetterFor = InternalStateModule.getterFor;

	collectionStrong = {
	  getConstructor: function (wrapper, CONSTRUCTOR_NAME, IS_MAP, ADDER) {
	    var Constructor = wrapper(function (that, iterable) {
	      anInstance(that, Prototype);
	      setInternalState(that, {
	        type: CONSTRUCTOR_NAME,
	        index: create(null),
	        first: null,
	        last: null,
	        size: 0
	      });
	      if (!DESCRIPTORS) that.size = 0;
	      if (!isNullOrUndefined(iterable)) iterate(iterable, that[ADDER], { that: that, AS_ENTRIES: IS_MAP });
	    });

	    var Prototype = Constructor.prototype;

	    var getInternalState = internalStateGetterFor(CONSTRUCTOR_NAME);

	    var define = function (that, key, value) {
	      var state = getInternalState(that);
	      var entry = getEntry(that, key);
	      var previous, index;
	      // change existing entry
	      if (entry) {
	        entry.value = value;
	      // create new entry
	      } else {
	        state.last = entry = {
	          index: index = fastKey(key, true),
	          key: key,
	          value: value,
	          previous: previous = state.last,
	          next: null,
	          removed: false
	        };
	        if (!state.first) state.first = entry;
	        if (previous) previous.next = entry;
	        if (DESCRIPTORS) state.size++;
	        else that.size++;
	        // add to index
	        if (index !== 'F') state.index[index] = entry;
	      } return that;
	    };

	    var getEntry = function (that, key) {
	      var state = getInternalState(that);
	      // fast case
	      var index = fastKey(key);
	      var entry;
	      if (index !== 'F') return state.index[index];
	      // frozen object case
	      for (entry = state.first; entry; entry = entry.next) {
	        if (entry.key === key) return entry;
	      }
	    };

	    defineBuiltIns(Prototype, {
	      // `{ Map, Set }.prototype.clear()` methods
	      // https://tc39.es/ecma262/#sec-map.prototype.clear
	      // https://tc39.es/ecma262/#sec-set.prototype.clear
	      clear: function clear() {
	        var that = this;
	        var state = getInternalState(that);
	        var entry = state.first;
	        while (entry) {
	          entry.removed = true;
	          if (entry.previous) entry.previous = entry.previous.next = null;
	          entry = entry.next;
	        }
	        state.first = state.last = null;
	        state.index = create(null);
	        if (DESCRIPTORS) state.size = 0;
	        else that.size = 0;
	      },
	      // `{ Map, Set }.prototype.delete(key)` methods
	      // https://tc39.es/ecma262/#sec-map.prototype.delete
	      // https://tc39.es/ecma262/#sec-set.prototype.delete
	      'delete': function (key) {
	        var that = this;
	        var state = getInternalState(that);
	        var entry = getEntry(that, key);
	        if (entry) {
	          var next = entry.next;
	          var prev = entry.previous;
	          delete state.index[entry.index];
	          entry.removed = true;
	          if (prev) prev.next = next;
	          if (next) next.previous = prev;
	          if (state.first === entry) state.first = next;
	          if (state.last === entry) state.last = prev;
	          if (DESCRIPTORS) state.size--;
	          else that.size--;
	        } return !!entry;
	      },
	      // `{ Map, Set }.prototype.forEach(callbackfn, thisArg = undefined)` methods
	      // https://tc39.es/ecma262/#sec-map.prototype.foreach
	      // https://tc39.es/ecma262/#sec-set.prototype.foreach
	      forEach: function forEach(callbackfn /* , that = undefined */) {
	        var state = getInternalState(this);
	        var boundFunction = bind(callbackfn, arguments.length > 1 ? arguments[1] : undefined);
	        var entry;
	        while (entry = entry ? entry.next : state.first) {
	          boundFunction(entry.value, entry.key, this);
	          // revert to the last existing entry
	          while (entry && entry.removed) entry = entry.previous;
	        }
	      },
	      // `{ Map, Set}.prototype.has(key)` methods
	      // https://tc39.es/ecma262/#sec-map.prototype.has
	      // https://tc39.es/ecma262/#sec-set.prototype.has
	      has: function has(key) {
	        return !!getEntry(this, key);
	      }
	    });

	    defineBuiltIns(Prototype, IS_MAP ? {
	      // `Map.prototype.get(key)` method
	      // https://tc39.es/ecma262/#sec-map.prototype.get
	      get: function get(key) {
	        var entry = getEntry(this, key);
	        return entry && entry.value;
	      },
	      // `Map.prototype.set(key, value)` method
	      // https://tc39.es/ecma262/#sec-map.prototype.set
	      set: function set(key, value) {
	        return define(this, key === 0 ? 0 : key, value);
	      }
	    } : {
	      // `Set.prototype.add(value)` method
	      // https://tc39.es/ecma262/#sec-set.prototype.add
	      add: function add(value) {
	        return define(this, value = value === 0 ? 0 : value, value);
	      }
	    });
	    if (DESCRIPTORS) defineBuiltInAccessor(Prototype, 'size', {
	      configurable: true,
	      get: function () {
	        return getInternalState(this).size;
	      }
	    });
	    return Constructor;
	  },
	  setStrong: function (Constructor, CONSTRUCTOR_NAME, IS_MAP) {
	    var ITERATOR_NAME = CONSTRUCTOR_NAME + ' Iterator';
	    var getInternalCollectionState = internalStateGetterFor(CONSTRUCTOR_NAME);
	    var getInternalIteratorState = internalStateGetterFor(ITERATOR_NAME);
	    // `{ Map, Set }.prototype.{ keys, values, entries, @@iterator }()` methods
	    // https://tc39.es/ecma262/#sec-map.prototype.entries
	    // https://tc39.es/ecma262/#sec-map.prototype.keys
	    // https://tc39.es/ecma262/#sec-map.prototype.values
	    // https://tc39.es/ecma262/#sec-map.prototype-@@iterator
	    // https://tc39.es/ecma262/#sec-set.prototype.entries
	    // https://tc39.es/ecma262/#sec-set.prototype.keys
	    // https://tc39.es/ecma262/#sec-set.prototype.values
	    // https://tc39.es/ecma262/#sec-set.prototype-@@iterator
	    defineIterator(Constructor, CONSTRUCTOR_NAME, function (iterated, kind) {
	      setInternalState(this, {
	        type: ITERATOR_NAME,
	        target: iterated,
	        state: getInternalCollectionState(iterated),
	        kind: kind,
	        last: null
	      });
	    }, function () {
	      var state = getInternalIteratorState(this);
	      var kind = state.kind;
	      var entry = state.last;
	      // revert to the last existing entry
	      while (entry && entry.removed) entry = entry.previous;
	      // get next entry
	      if (!state.target || !(state.last = entry = entry ? entry.next : state.state.first)) {
	        // or finish the iteration
	        state.target = null;
	        return createIterResultObject(undefined, true);
	      }
	      // return step by kind
	      if (kind === 'keys') return createIterResultObject(entry.key, false);
	      if (kind === 'values') return createIterResultObject(entry.value, false);
	      return createIterResultObject([entry.key, entry.value], false);
	    }, IS_MAP ? 'entries' : 'values', !IS_MAP, true);

	    // `{ Map, Set }.prototype[@@species]` accessors
	    // https://tc39.es/ecma262/#sec-get-map-@@species
	    // https://tc39.es/ecma262/#sec-get-set-@@species
	    setSpecies(CONSTRUCTOR_NAME);
	  }
	};
	return collectionStrong;
}

var hasRequiredEs_set_constructor;

function requireEs_set_constructor () {
	if (hasRequiredEs_set_constructor) return es_set_constructor;
	hasRequiredEs_set_constructor = 1;
	var collection = /*@__PURE__*/ requireCollection();
	var collectionStrong = /*@__PURE__*/ requireCollectionStrong();

	// `Set` constructor
	// https://tc39.es/ecma262/#sec-set-objects
	collection('Set', function (init) {
	  return function Set() { return init(this, arguments.length ? arguments[0] : undefined); };
	}, collectionStrong);
	return es_set_constructor;
}

var hasRequiredEs_set;

function requireEs_set () {
	if (hasRequiredEs_set) return es_set;
	hasRequiredEs_set = 1;
	// TODO: Remove this module from `core-js@4` since it's replaced to module below
	requireEs_set_constructor();
	return es_set;
}

var es_set_difference_v2 = {};

var aSet;
var hasRequiredASet;

function requireASet () {
	if (hasRequiredASet) return aSet;
	hasRequiredASet = 1;
	var tryToString = /*@__PURE__*/ requireTryToString();

	var $TypeError = TypeError;

	// Perform ? RequireInternalSlot(M, [[SetData]])
	aSet = function (it) {
	  if (typeof it == 'object' && 'size' in it && 'has' in it && 'add' in it && 'delete' in it && 'keys' in it) return it;
	  throw new $TypeError(tryToString(it) + ' is not a set');
	};
	return aSet;
}

var caller;
var hasRequiredCaller;

function requireCaller () {
	if (hasRequiredCaller) return caller;
	hasRequiredCaller = 1;
	caller = function (methodName, numArgs) {
	  return numArgs === 1 ? function (object, arg) {
	    return object[methodName](arg);
	  } : function (object, arg1, arg2) {
	    return object[methodName](arg1, arg2);
	  };
	};
	return caller;
}

var setHelpers;
var hasRequiredSetHelpers;

function requireSetHelpers () {
	if (hasRequiredSetHelpers) return setHelpers;
	hasRequiredSetHelpers = 1;
	var getBuiltIn = /*@__PURE__*/ requireGetBuiltIn();
	var caller = /*@__PURE__*/ requireCaller();

	var Set = getBuiltIn('Set');
	var SetPrototype = Set.prototype;

	setHelpers = {
	  Set: Set,
	  add: caller('add', 1),
	  has: caller('has', 1),
	  remove: caller('delete', 1),
	  proto: SetPrototype
	};
	return setHelpers;
}

var iterateSimple;
var hasRequiredIterateSimple;

function requireIterateSimple () {
	if (hasRequiredIterateSimple) return iterateSimple;
	hasRequiredIterateSimple = 1;
	var call = /*@__PURE__*/ requireFunctionCall();

	iterateSimple = function (record, fn, ITERATOR_INSTEAD_OF_RECORD) {
	  var iterator = ITERATOR_INSTEAD_OF_RECORD ? record : record.iterator;
	  var next = record.next;
	  var step, result;
	  while (!(step = call(next, iterator)).done) {
	    result = fn(step.value);
	    if (result !== undefined) return result;
	  }
	};
	return iterateSimple;
}

var setIterate;
var hasRequiredSetIterate;

function requireSetIterate () {
	if (hasRequiredSetIterate) return setIterate;
	hasRequiredSetIterate = 1;
	var iterateSimple = /*@__PURE__*/ requireIterateSimple();

	setIterate = function (set, fn, interruptible) {
	  return interruptible ? iterateSimple(set.keys(), fn, true) : set.forEach(fn);
	};
	return setIterate;
}

var setClone;
var hasRequiredSetClone;

function requireSetClone () {
	if (hasRequiredSetClone) return setClone;
	hasRequiredSetClone = 1;
	var SetHelpers = /*@__PURE__*/ requireSetHelpers();
	var iterate = /*@__PURE__*/ requireSetIterate();

	var Set = SetHelpers.Set;
	var add = SetHelpers.add;

	setClone = function (set) {
	  var result = new Set();
	  iterate(set, function (it) {
	    add(result, it);
	  });
	  return result;
	};
	return setClone;
}

var setSize;
var hasRequiredSetSize;

function requireSetSize () {
	if (hasRequiredSetSize) return setSize;
	hasRequiredSetSize = 1;
	setSize = function (set) {
	  return set.size;
	};
	return setSize;
}

var getIteratorDirect;
var hasRequiredGetIteratorDirect;

function requireGetIteratorDirect () {
	if (hasRequiredGetIteratorDirect) return getIteratorDirect;
	hasRequiredGetIteratorDirect = 1;
	// `GetIteratorDirect(obj)` abstract operation
	// https://tc39.es/ecma262/#sec-getiteratordirect
	getIteratorDirect = function (obj) {
	  return {
	    iterator: obj,
	    next: obj.next,
	    done: false
	  };
	};
	return getIteratorDirect;
}

var getSetRecord;
var hasRequiredGetSetRecord;

function requireGetSetRecord () {
	if (hasRequiredGetSetRecord) return getSetRecord;
	hasRequiredGetSetRecord = 1;
	var aCallable = /*@__PURE__*/ requireACallable();
	var anObject = /*@__PURE__*/ requireAnObject();
	var call = /*@__PURE__*/ requireFunctionCall();
	var toIntegerOrInfinity = /*@__PURE__*/ requireToIntegerOrInfinity();
	var getIteratorDirect = /*@__PURE__*/ requireGetIteratorDirect();

	var INVALID_SIZE = 'Invalid size';
	var $RangeError = RangeError;
	var $TypeError = TypeError;
	var max = Math.max;

	var SetRecord = function (set, intSize) {
	  this.set = set;
	  this.size = max(intSize, 0);
	  this.has = aCallable(set.has);
	  this.keys = aCallable(set.keys);
	};

	SetRecord.prototype = {
	  getIterator: function () {
	    return getIteratorDirect(anObject(call(this.keys, this.set)));
	  },
	  includes: function (it) {
	    return call(this.has, this.set, it);
	  }
	};

	// `GetSetRecord` abstract operation
	// https://tc39.es/proposal-set-methods/#sec-getsetrecord
	getSetRecord = function (obj) {
	  anObject(obj);
	  var numSize = +obj.size;
	  // NOTE: If size is undefined, then numSize will be NaN
	  // eslint-disable-next-line no-self-compare -- NaN check
	  if (numSize !== numSize) throw new $TypeError(INVALID_SIZE);
	  var intSize = toIntegerOrInfinity(numSize);
	  if (intSize < 0) throw new $RangeError(INVALID_SIZE);
	  return new SetRecord(obj, intSize);
	};
	return getSetRecord;
}

var setDifference;
var hasRequiredSetDifference;

function requireSetDifference () {
	if (hasRequiredSetDifference) return setDifference;
	hasRequiredSetDifference = 1;
	var aSet = /*@__PURE__*/ requireASet();
	var SetHelpers = /*@__PURE__*/ requireSetHelpers();
	var clone = /*@__PURE__*/ requireSetClone();
	var size = /*@__PURE__*/ requireSetSize();
	var getSetRecord = /*@__PURE__*/ requireGetSetRecord();
	var iterateSet = /*@__PURE__*/ requireSetIterate();
	var iterateSimple = /*@__PURE__*/ requireIterateSimple();

	var has = SetHelpers.has;
	var remove = SetHelpers.remove;

	// `Set.prototype.difference` method
	// https://tc39.es/ecma262/#sec-set.prototype.difference
	setDifference = function difference(other) {
	  var O = aSet(this);
	  var otherRec = getSetRecord(other);
	  var result = clone(O);
	  if (size(O) <= otherRec.size) iterateSet(O, function (e) {
	    if (otherRec.includes(e)) remove(result, e);
	  });
	  else iterateSimple(otherRec.getIterator(), function (e) {
	    if (has(result, e)) remove(result, e);
	  });
	  return result;
	};
	return setDifference;
}

var setMethodAcceptSetLike;
var hasRequiredSetMethodAcceptSetLike;

function requireSetMethodAcceptSetLike () {
	if (hasRequiredSetMethodAcceptSetLike) return setMethodAcceptSetLike;
	hasRequiredSetMethodAcceptSetLike = 1;
	setMethodAcceptSetLike = function () {
	  return false;
	};
	return setMethodAcceptSetLike;
}

var hasRequiredEs_set_difference_v2;

function requireEs_set_difference_v2 () {
	if (hasRequiredEs_set_difference_v2) return es_set_difference_v2;
	hasRequiredEs_set_difference_v2 = 1;
	var $ = /*@__PURE__*/ require_export();
	var difference = /*@__PURE__*/ requireSetDifference();
	var fails = /*@__PURE__*/ requireFails();
	var setMethodAcceptSetLike = /*@__PURE__*/ requireSetMethodAcceptSetLike();

	var SET_LIKE_INCORRECT_BEHAVIOR = !setMethodAcceptSetLike('difference', function (result) {
	  return result.size === 0;
	});

	var FORCED = SET_LIKE_INCORRECT_BEHAVIOR || fails(function () {
	  // https://bugs.webkit.org/show_bug.cgi?id=288595
	  var setLike = {
	    size: 1,
	    has: function () { return true; },
	    keys: function () {
	      var index = 0;
	      return {
	        next: function () {
	          var done = index++ > 1;
	          if (baseSet.has(1)) baseSet.clear();
	          return { done: done, value: 2 };
	        }
	      };
	    }
	  };
	  // eslint-disable-next-line es/no-set -- testing
	  var baseSet = new Set([1, 2, 3, 4]);
	  // eslint-disable-next-line es/no-set-prototype-difference -- testing
	  return baseSet.difference(setLike).size !== 3;
	});

	// `Set.prototype.difference` method
	// https://tc39.es/ecma262/#sec-set.prototype.difference
	$({ target: 'Set', proto: true, real: true, forced: FORCED }, {
	  difference: difference
	});
	return es_set_difference_v2;
}

var es_set_intersection_v2 = {};

var setIntersection;
var hasRequiredSetIntersection;

function requireSetIntersection () {
	if (hasRequiredSetIntersection) return setIntersection;
	hasRequiredSetIntersection = 1;
	var aSet = /*@__PURE__*/ requireASet();
	var SetHelpers = /*@__PURE__*/ requireSetHelpers();
	var size = /*@__PURE__*/ requireSetSize();
	var getSetRecord = /*@__PURE__*/ requireGetSetRecord();
	var iterateSet = /*@__PURE__*/ requireSetIterate();
	var iterateSimple = /*@__PURE__*/ requireIterateSimple();

	var Set = SetHelpers.Set;
	var add = SetHelpers.add;
	var has = SetHelpers.has;

	// `Set.prototype.intersection` method
	// https://tc39.es/ecma262/#sec-set.prototype.intersection
	setIntersection = function intersection(other) {
	  var O = aSet(this);
	  var otherRec = getSetRecord(other);
	  var result = new Set();

	  if (size(O) > otherRec.size) {
	    iterateSimple(otherRec.getIterator(), function (e) {
	      if (has(O, e)) add(result, e);
	    });
	  } else {
	    iterateSet(O, function (e) {
	      if (otherRec.includes(e)) add(result, e);
	    });
	  }

	  return result;
	};
	return setIntersection;
}

var hasRequiredEs_set_intersection_v2;

function requireEs_set_intersection_v2 () {
	if (hasRequiredEs_set_intersection_v2) return es_set_intersection_v2;
	hasRequiredEs_set_intersection_v2 = 1;
	var $ = /*@__PURE__*/ require_export();
	var fails = /*@__PURE__*/ requireFails();
	var intersection = /*@__PURE__*/ requireSetIntersection();
	var setMethodAcceptSetLike = /*@__PURE__*/ requireSetMethodAcceptSetLike();

	var INCORRECT = !setMethodAcceptSetLike('intersection', function (result) {
	  return result.size === 2 && result.has(1) && result.has(2);
	}) || fails(function () {
	  // eslint-disable-next-line es/no-array-from, es/no-set, es/no-set-prototype-intersection -- testing
	  return String(Array.from(new Set([1, 2, 3]).intersection(new Set([3, 2])))) !== '3,2';
	});

	// `Set.prototype.intersection` method
	// https://tc39.es/ecma262/#sec-set.prototype.intersection
	$({ target: 'Set', proto: true, real: true, forced: INCORRECT }, {
	  intersection: intersection
	});
	return es_set_intersection_v2;
}

var es_set_isDisjointFrom_v2 = {};

var setIsDisjointFrom;
var hasRequiredSetIsDisjointFrom;

function requireSetIsDisjointFrom () {
	if (hasRequiredSetIsDisjointFrom) return setIsDisjointFrom;
	hasRequiredSetIsDisjointFrom = 1;
	var aSet = /*@__PURE__*/ requireASet();
	var has = /*@__PURE__*/ requireSetHelpers().has;
	var size = /*@__PURE__*/ requireSetSize();
	var getSetRecord = /*@__PURE__*/ requireGetSetRecord();
	var iterateSet = /*@__PURE__*/ requireSetIterate();
	var iterateSimple = /*@__PURE__*/ requireIterateSimple();
	var iteratorClose = /*@__PURE__*/ requireIteratorClose();

	// `Set.prototype.isDisjointFrom` method
	// https://tc39.es/ecma262/#sec-set.prototype.isdisjointfrom
	setIsDisjointFrom = function isDisjointFrom(other) {
	  var O = aSet(this);
	  var otherRec = getSetRecord(other);
	  if (size(O) <= otherRec.size) return iterateSet(O, function (e) {
	    if (otherRec.includes(e)) return false;
	  }, true) !== false;
	  var iterator = otherRec.getIterator();
	  return iterateSimple(iterator, function (e) {
	    if (has(O, e)) return iteratorClose(iterator, 'normal', false);
	  }) !== false;
	};
	return setIsDisjointFrom;
}

var hasRequiredEs_set_isDisjointFrom_v2;

function requireEs_set_isDisjointFrom_v2 () {
	if (hasRequiredEs_set_isDisjointFrom_v2) return es_set_isDisjointFrom_v2;
	hasRequiredEs_set_isDisjointFrom_v2 = 1;
	var $ = /*@__PURE__*/ require_export();
	var isDisjointFrom = /*@__PURE__*/ requireSetIsDisjointFrom();
	var setMethodAcceptSetLike = /*@__PURE__*/ requireSetMethodAcceptSetLike();

	var INCORRECT = !setMethodAcceptSetLike('isDisjointFrom', function (result) {
	  return !result;
	});

	// `Set.prototype.isDisjointFrom` method
	// https://tc39.es/ecma262/#sec-set.prototype.isdisjointfrom
	$({ target: 'Set', proto: true, real: true, forced: INCORRECT }, {
	  isDisjointFrom: isDisjointFrom
	});
	return es_set_isDisjointFrom_v2;
}

var es_set_isSubsetOf_v2 = {};

var setIsSubsetOf;
var hasRequiredSetIsSubsetOf;

function requireSetIsSubsetOf () {
	if (hasRequiredSetIsSubsetOf) return setIsSubsetOf;
	hasRequiredSetIsSubsetOf = 1;
	var aSet = /*@__PURE__*/ requireASet();
	var size = /*@__PURE__*/ requireSetSize();
	var iterate = /*@__PURE__*/ requireSetIterate();
	var getSetRecord = /*@__PURE__*/ requireGetSetRecord();

	// `Set.prototype.isSubsetOf` method
	// https://tc39.es/ecma262/#sec-set.prototype.issubsetof
	setIsSubsetOf = function isSubsetOf(other) {
	  var O = aSet(this);
	  var otherRec = getSetRecord(other);
	  if (size(O) > otherRec.size) return false;
	  return iterate(O, function (e) {
	    if (!otherRec.includes(e)) return false;
	  }, true) !== false;
	};
	return setIsSubsetOf;
}

var hasRequiredEs_set_isSubsetOf_v2;

function requireEs_set_isSubsetOf_v2 () {
	if (hasRequiredEs_set_isSubsetOf_v2) return es_set_isSubsetOf_v2;
	hasRequiredEs_set_isSubsetOf_v2 = 1;
	var $ = /*@__PURE__*/ require_export();
	var isSubsetOf = /*@__PURE__*/ requireSetIsSubsetOf();
	var setMethodAcceptSetLike = /*@__PURE__*/ requireSetMethodAcceptSetLike();

	var INCORRECT = !setMethodAcceptSetLike('isSubsetOf', function (result) {
	  return result;
	});

	// `Set.prototype.isSubsetOf` method
	// https://tc39.es/ecma262/#sec-set.prototype.issubsetof
	$({ target: 'Set', proto: true, real: true, forced: INCORRECT }, {
	  isSubsetOf: isSubsetOf
	});
	return es_set_isSubsetOf_v2;
}

var es_set_isSupersetOf_v2 = {};

var setIsSupersetOf;
var hasRequiredSetIsSupersetOf;

function requireSetIsSupersetOf () {
	if (hasRequiredSetIsSupersetOf) return setIsSupersetOf;
	hasRequiredSetIsSupersetOf = 1;
	var aSet = /*@__PURE__*/ requireASet();
	var has = /*@__PURE__*/ requireSetHelpers().has;
	var size = /*@__PURE__*/ requireSetSize();
	var getSetRecord = /*@__PURE__*/ requireGetSetRecord();
	var iterateSimple = /*@__PURE__*/ requireIterateSimple();
	var iteratorClose = /*@__PURE__*/ requireIteratorClose();

	// `Set.prototype.isSupersetOf` method
	// https://tc39.es/ecma262/#sec-set.prototype.issupersetof
	setIsSupersetOf = function isSupersetOf(other) {
	  var O = aSet(this);
	  var otherRec = getSetRecord(other);
	  if (size(O) < otherRec.size) return false;
	  var iterator = otherRec.getIterator();
	  return iterateSimple(iterator, function (e) {
	    if (!has(O, e)) return iteratorClose(iterator, 'normal', false);
	  }) !== false;
	};
	return setIsSupersetOf;
}

var hasRequiredEs_set_isSupersetOf_v2;

function requireEs_set_isSupersetOf_v2 () {
	if (hasRequiredEs_set_isSupersetOf_v2) return es_set_isSupersetOf_v2;
	hasRequiredEs_set_isSupersetOf_v2 = 1;
	var $ = /*@__PURE__*/ require_export();
	var isSupersetOf = /*@__PURE__*/ requireSetIsSupersetOf();
	var setMethodAcceptSetLike = /*@__PURE__*/ requireSetMethodAcceptSetLike();

	var INCORRECT = !setMethodAcceptSetLike('isSupersetOf', function (result) {
	  return !result;
	});

	// `Set.prototype.isSupersetOf` method
	// https://tc39.es/ecma262/#sec-set.prototype.issupersetof
	$({ target: 'Set', proto: true, real: true, forced: INCORRECT }, {
	  isSupersetOf: isSupersetOf
	});
	return es_set_isSupersetOf_v2;
}

var es_set_symmetricDifference_v2 = {};

var setSymmetricDifference;
var hasRequiredSetSymmetricDifference;

function requireSetSymmetricDifference () {
	if (hasRequiredSetSymmetricDifference) return setSymmetricDifference;
	hasRequiredSetSymmetricDifference = 1;
	var aSet = /*@__PURE__*/ requireASet();
	var SetHelpers = /*@__PURE__*/ requireSetHelpers();
	var clone = /*@__PURE__*/ requireSetClone();
	var getSetRecord = /*@__PURE__*/ requireGetSetRecord();
	var iterateSimple = /*@__PURE__*/ requireIterateSimple();

	var add = SetHelpers.add;
	var has = SetHelpers.has;
	var remove = SetHelpers.remove;

	// `Set.prototype.symmetricDifference` method
	// https://tc39.es/ecma262/#sec-set.prototype.symmetricdifference
	setSymmetricDifference = function symmetricDifference(other) {
	  var O = aSet(this);
	  var keysIter = getSetRecord(other).getIterator();
	  var result = clone(O);
	  iterateSimple(keysIter, function (e) {
	    if (has(O, e)) remove(result, e);
	    else add(result, e);
	  });
	  return result;
	};
	return setSymmetricDifference;
}

var setMethodGetKeysBeforeCloningDetection;
var hasRequiredSetMethodGetKeysBeforeCloningDetection;

function requireSetMethodGetKeysBeforeCloningDetection () {
	if (hasRequiredSetMethodGetKeysBeforeCloningDetection) return setMethodGetKeysBeforeCloningDetection;
	hasRequiredSetMethodGetKeysBeforeCloningDetection = 1;
	// Should get iterator record of a set-like object before cloning this
	// https://bugs.webkit.org/show_bug.cgi?id=289430
	setMethodGetKeysBeforeCloningDetection = function (METHOD_NAME) {
	  try {
	    // eslint-disable-next-line es/no-set -- needed for test
	    var baseSet = new Set();
	    var setLike = {
	      size: 0,
	      has: function () { return true; },
	      keys: function () {
	        // eslint-disable-next-line es/no-object-defineproperty -- needed for test
	        return Object.defineProperty({}, 'next', {
	          get: function () {
	            baseSet.clear();
	            baseSet.add(4);
	            return function () {
	              return { done: true };
	            };
	          }
	        });
	      }
	    };
	    var result = baseSet[METHOD_NAME](setLike);

	    return result.size === 1 && result.values().next().value === 4;
	  } catch (error) {
	    return false;
	  }
	};
	return setMethodGetKeysBeforeCloningDetection;
}

var hasRequiredEs_set_symmetricDifference_v2;

function requireEs_set_symmetricDifference_v2 () {
	if (hasRequiredEs_set_symmetricDifference_v2) return es_set_symmetricDifference_v2;
	hasRequiredEs_set_symmetricDifference_v2 = 1;
	var $ = /*@__PURE__*/ require_export();
	var symmetricDifference = /*@__PURE__*/ requireSetSymmetricDifference();
	var setMethodGetKeysBeforeCloning = /*@__PURE__*/ requireSetMethodGetKeysBeforeCloningDetection();
	var setMethodAcceptSetLike = /*@__PURE__*/ requireSetMethodAcceptSetLike();

	var FORCED = !setMethodAcceptSetLike('symmetricDifference') || !setMethodGetKeysBeforeCloning('symmetricDifference');

	// `Set.prototype.symmetricDifference` method
	// https://tc39.es/ecma262/#sec-set.prototype.symmetricdifference
	$({ target: 'Set', proto: true, real: true, forced: FORCED }, {
	  symmetricDifference: symmetricDifference
	});
	return es_set_symmetricDifference_v2;
}

var es_set_union_v2 = {};

var setUnion;
var hasRequiredSetUnion;

function requireSetUnion () {
	if (hasRequiredSetUnion) return setUnion;
	hasRequiredSetUnion = 1;
	var aSet = /*@__PURE__*/ requireASet();
	var add = /*@__PURE__*/ requireSetHelpers().add;
	var clone = /*@__PURE__*/ requireSetClone();
	var getSetRecord = /*@__PURE__*/ requireGetSetRecord();
	var iterateSimple = /*@__PURE__*/ requireIterateSimple();

	// `Set.prototype.union` method
	// https://tc39.es/ecma262/#sec-set.prototype.union
	setUnion = function union(other) {
	  var O = aSet(this);
	  var keysIter = getSetRecord(other).getIterator();
	  var result = clone(O);
	  iterateSimple(keysIter, function (it) {
	    add(result, it);
	  });
	  return result;
	};
	return setUnion;
}

var hasRequiredEs_set_union_v2;

function requireEs_set_union_v2 () {
	if (hasRequiredEs_set_union_v2) return es_set_union_v2;
	hasRequiredEs_set_union_v2 = 1;
	var $ = /*@__PURE__*/ require_export();
	var union = /*@__PURE__*/ requireSetUnion();
	var setMethodGetKeysBeforeCloning = /*@__PURE__*/ requireSetMethodGetKeysBeforeCloningDetection();
	var setMethodAcceptSetLike = /*@__PURE__*/ requireSetMethodAcceptSetLike();

	var FORCED = !setMethodAcceptSetLike('union') || !setMethodGetKeysBeforeCloning('union');

	// `Set.prototype.union` method
	// https://tc39.es/ecma262/#sec-set.prototype.union
	$({ target: 'Set', proto: true, real: true, forced: FORCED }, {
	  union: union
	});
	return es_set_union_v2;
}

var set$2;
var hasRequiredSet$2;

function requireSet$2 () {
	if (hasRequiredSet$2) return set$2;
	hasRequiredSet$2 = 1;
	requireEs_array_iterator();
	requireEs_set();
	requireEs_set_difference_v2();
	requireEs_set_intersection_v2();
	requireEs_set_isDisjointFrom_v2();
	requireEs_set_isSubsetOf_v2();
	requireEs_set_isSupersetOf_v2();
	requireEs_set_symmetricDifference_v2();
	requireEs_set_union_v2();
	requireEs_string_iterator();
	var path = /*@__PURE__*/ requirePath();

	set$2 = path.Set;
	return set$2;
}

var set$1;
var hasRequiredSet$1;

function requireSet$1 () {
	if (hasRequiredSet$1) return set$1;
	hasRequiredSet$1 = 1;
	var parent = /*@__PURE__*/ requireSet$2();
	requireWeb_domCollections_iterator();

	set$1 = parent;
	return set$1;
}

var set;
var hasRequiredSet;

function requireSet () {
	if (hasRequiredSet) return set;
	hasRequiredSet = 1;
	set = /*@__PURE__*/ requireSet$1();
	return set;
}

var setExports = requireSet();
var _Set = /*@__PURE__*/getDefaultExportFromCjs(setExports);

// Utility functions for ordering and stacking of items
const EPSILON = 0.001; // used when checking collisions, to prevent round-off errors

/**
 * Order items by their start data
 * @param {Item[]} items
 */
function orderByStart(items) {
  _sortInstanceProperty(items).call(items, (a, b) => a.data.start - b.data.start);
}

/**
 * Order items by their end date. If they have no end date, their start date
 * is used.
 * @param {Item[]} items
 */
function orderByEnd(items) {
  _sortInstanceProperty(items).call(items, (a, b) => {
    const aTime = "end" in a.data ? a.data.end : a.data.start;
    const bTime = "end" in b.data ? b.data.end : b.data.start;
    return aTime - bTime;
  });
}

/**
 * Adjust vertical positions of the items such that they don't overlap each
 * other.
 * @param {Item[]} items
 *            All visible items
 * @param {{item: {horizontal: number, vertical: number}, axis: number}} margin
 *            Margins between items and between items and the axis.
 * @param {boolean} [force=false]
 *            If true, all items will be repositioned. If false (default), only
 *            items having a top===null will be re-stacked
 * @param {function} shouldBailItemsRedrawFunction
 *            bailing function
 * @return {boolean} shouldBail
 */
function stack(items, margin, force, shouldBailItemsRedrawFunction) {
  const stackingResult = performStacking(items, margin.item, false, item => item.stack && (force || item.top === null), item => item.stack, () => margin.axis, shouldBailItemsRedrawFunction);

  // If shouldBail function returned true during stacking calculation
  return stackingResult === null;
}

/**
 * Adjust vertical positions of the items within a single subgroup such that they
 * don't overlap each other.
 * @param {Item[]} items
 *            All items withina subgroup
 * @param {{item: {horizontal: number, vertical: number}, axis: number}} margin
 *            Margins between items and between items and the axis.
 * @param {subgroup} subgroup
 *            The subgroup that is being stacked
 */
function substack(items, margin, subgroup) {
  const subgroupHeight = performStacking(items, margin.item, false, item => item.stack, () => true, item => item.baseTop);
  subgroup.height = subgroupHeight - subgroup.top + 0.5 * margin.item.vertical;
}

/**
 * Adjust vertical positions of the items without stacking them
 * @param {Item[]} items
 *            All visible items
 * @param {{item: {horizontal: number, vertical: number}, axis: number}} margin
 *            Margins between items and between items and the axis.
 * @param {subgroups[]} subgroups
 *            All subgroups
 * @param {boolean} isStackSubgroups
 */
function nostack(items, margin, subgroups, isStackSubgroups) {
  for (let i = 0; i < items.length; i++) {
    if (items[i].data.subgroup == undefined) {
      items[i].top = margin.item.vertical;
      continue;
    }
    if (items[i].data.subgroup === undefined || !isStackSubgroups) continue;
    let newTop = 0;
    for (const subgroup in subgroups) {
      if (!Object.prototype.hasOwnProperty.call(subgroups, subgroup) || subgroups[subgroup].visible !== true || subgroups[subgroup].index >= subgroups[items[i].data.subgroup].index) continue;
      newTop += subgroups[subgroup].height;
      subgroups[items[i].data.subgroup].top = newTop;
    }
    items[i].top = newTop + 0.5 * margin.item.vertical;
  }
  if (!isStackSubgroups) stackSubgroups(items, margin, subgroups);
}

/**
 * Adjust vertical positions of the subgroups such that they don't overlap each
 * other.
 * @param {Array.<timeline.Item>} items
 * @param {{item: {horizontal: number, vertical: number}, axis: number}} margin Margins between items and between items and the axis.
 * @param {subgroups[]} subgroups
 *            All subgroups
 */
function stackSubgroups(items, margin, subgroups) {
  var _context;
  performStacking(_sortInstanceProperty(_context = _Object$values(subgroups)).call(_context, (a, b) => {
    if (a.index > b.index) return 1;
    if (a.index < b.index) return -1;
    return 0;
  }), {
    vertical: 0
  }, true, () => true, () => true, () => 0);
  for (let i = 0; i < items.length; i++) {
    if (items[i].data.subgroup !== undefined) {
      items[i].top = subgroups[items[i].data.subgroup].top + 0.5 * margin.item.vertical;
    }
  }
}

/**
 * Adjust vertical positions of the subgroups such that they don't overlap each
 * other, then stacks the contents of each subgroup individually.
 * @param {Item[]} subgroupItems
 *            All the items in a subgroup
 * @param {{item: {horizontal: number, vertical: number}, axis: number}} margin
 *            Margins between items and between items and the axis.
 * @param {subgroups[]} subgroups
 *            All subgroups
 */
function stackSubgroupsWithInnerStack(subgroupItems, margin, subgroups) {
  let doSubStack = false;

  // Run subgroups in their order (if any)
  const subgroupOrder = [];
  for (let subgroup in subgroups) {
    if (Object.prototype.hasOwnProperty.call(subgroups[subgroup], "index")) {
      subgroupOrder[subgroups[subgroup].index] = subgroup;
    } else {
      subgroupOrder.push(subgroup);
    }
  }
  for (let j = 0; j < subgroupOrder.length; j++) {
    let subgroup = subgroupOrder[j];
    if (!Object.prototype.hasOwnProperty.call(subgroups, subgroup)) continue;
    doSubStack = doSubStack || subgroups[subgroup].stack;
    subgroups[subgroup].top = 0;
    for (const otherSubgroup in subgroups) {
      if (subgroups[otherSubgroup].visible && subgroups[subgroup].index > subgroups[otherSubgroup].index) {
        subgroups[subgroup].top += subgroups[otherSubgroup].height;
      }
    }
    const items = subgroupItems[subgroup];
    for (let i = 0; i < items.length; i++) {
      if (items[i].data.subgroup === undefined) continue;
      items[i].top = subgroups[items[i].data.subgroup].top + 0.5 * margin.item.vertical;
      if (subgroups[subgroup].stack) items[i].baseTop = items[i].top;
    }
    if (doSubStack && subgroups[subgroup].stack) substack(subgroupItems[subgroup], margin, subgroups[subgroup]);
  }
}

/**
 * Reusable stacking function
 *
 * @param {Item[]} items
 * An array of items to consider during stacking.
 * @param {{horizontal: number, vertical: number}} margins
 * Margins to be used for collision checking and placement of items.
 * @param {boolean} compareTimes
 * By default, horizontal collision is checked based on the spatial position of the items (left/right and width).
 * If this argument is true, horizontal collision will instead be checked based on the start/end times of each item.
 * Vertical collision is always checked spatially.
 * @param {function(Item): number | null} shouldStack
 * A callback function which is called before we start to process an item. The return value indicates whether the item will be processed.
 * @param {function(Item): boolean} shouldOthersStack
 * A callback function which indicates whether other items should consider this item when being stacked.
 * @param {function(Item): number} getInitialHeight
 * A callback function which determines the height items are initially placed at
 * @param {function(): boolean} shouldBail
 * A callback function which should indicate if the stacking process should be aborted.
 *
 * @returns {null|number}
 * if shouldBail was triggered, returns null
 * otherwise, returns the maximum height
 */
function performStacking(items, margins, compareTimes, shouldStack, shouldOthersStack, getInitialHeight, shouldBail) {
  // Time-based horizontal comparison
  let getItemStart = item => item.start;
  let getItemEnd = item => item.end;
  if (!compareTimes) {
    // Spatial horizontal comparisons
    const rtl = !!(items[0] && items[0].options.rtl);
    if (rtl) {
      getItemStart = item => item.right;
    } else {
      getItemStart = item => item.left;
    }
    getItemEnd = item => getItemStart(item) + item.width + margins.horizontal;
  }
  const itemsToPosition = [];
  const itemsAlreadyPositioned = []; // It's vital that this array is kept sorted based on the start of each item

  // If the order we needed to place items was based purely on the start of each item, we could calculate stacking very efficiently.
  // Unfortunately for us, this is not guaranteed. But the order is often based on the start of items at least to some degree, and
  // we can use this to make some optimisations. While items are proceeding in order of start, we can keep moving our search indexes
  // forwards. Then if we encounter an item that's out of order, we reset our indexes and search from the beginning of the array again.
  let previousStart = null;
  let insertionIndex = 0;

  // First let's handle any immoveable items
  for (const item of items) {
    if (shouldStack(item)) {
      itemsToPosition.push(item);
    } else {
      if (shouldOthersStack(item)) {
        const itemStart = getItemStart(item);

        // We need to put immoveable items into itemsAlreadyPositioned and ensure that this array is sorted.
        // We could simply insert them, and then use JavaScript's sort function to sort them afterwards.
        // This would achieve an average complexity of O(n log n).
        //
        // Instead, I'm gambling that the start of each item will usually be the same or later than the
        // start of the previous item. While this holds (best case), we can insert items in O(n).
        // In the worst case (where each item starts before the previous item) this grows to O(n^2).
        //
        // I am making the assumption that for most datasets, the "order" function will have relatively low cardinality,
        // and therefore this tradeoff should be easily worth it.
        if (previousStart !== null && itemStart < previousStart - EPSILON) {
          insertionIndex = 0;
        }
        previousStart = itemStart;
        insertionIndex = findIndexFrom(itemsAlreadyPositioned, i => getItemStart(i) - EPSILON > itemStart, insertionIndex);
        _spliceInstanceProperty(itemsAlreadyPositioned).call(itemsAlreadyPositioned, insertionIndex, 0, item);
        insertionIndex++;
      }
    }
  }

  // Now we can loop through each item (in order) and find a position for them
  previousStart = null;
  let previousEnd = null;
  insertionIndex = 0;
  let horizontalOverlapStartIndex = 0;
  let horizontalOverlapEndIndex = 0;
  let maxHeight = 0;
  while (itemsToPosition.length > 0) {
    var _context2;
    const item = itemsToPosition.shift();
    item.top = getInitialHeight(item);
    const itemStart = getItemStart(item);
    const itemEnd = getItemEnd(item);
    if (previousStart !== null && itemStart < previousStart - EPSILON) {
      horizontalOverlapStartIndex = 0;
      horizontalOverlapEndIndex = 0;
      insertionIndex = 0;
      previousEnd = null;
    }
    if (previousStart === null || itemStart > previousStart + EPSILON) {
      // Take advantage of the sorted itemsAlreadyPositioned array to narrow down the search
      horizontalOverlapStartIndex = findIndexFrom(itemsAlreadyPositioned, i => itemStart < getItemEnd(i) - EPSILON, horizontalOverlapStartIndex);
    }
    previousStart = itemStart;

    // Since items aren't sorted by end time, it might increase or decrease from one item to the next. In order to keep an efficient search area, we will seek forwards/backwards accordingly.
    if (previousEnd === null || previousEnd < itemEnd - EPSILON) {
      horizontalOverlapEndIndex = findIndexFrom(itemsAlreadyPositioned, i => itemEnd < getItemStart(i) - EPSILON, Math.max(horizontalOverlapStartIndex, horizontalOverlapEndIndex));
    }
    if (previousEnd !== null && previousEnd - EPSILON > itemEnd) {
      horizontalOverlapEndIndex = findLastIndexBetween(itemsAlreadyPositioned, i => itemEnd + EPSILON >= getItemStart(i), horizontalOverlapStartIndex, horizontalOverlapEndIndex) + 1;
    }
    previousEnd = itemEnd;

    // Sort by vertical position so we don't have to reconsider past items if we move an item
    const horizontallyCollidingItems = _sortInstanceProperty(_context2 = filterBetween(itemsAlreadyPositioned, i => itemStart < getItemEnd(i) - EPSILON, horizontalOverlapStartIndex, horizontalOverlapEndIndex)).call(_context2, (a, b) => a.top - b.top);

    // Keep moving the item down until it stops colliding with any other items
    for (let i2 = 0; i2 < horizontallyCollidingItems.length; i2++) {
      const otherItem = horizontallyCollidingItems[i2];
      if (checkVerticalSpatialCollision(item, otherItem, margins)) {
        item.top = otherItem.top + otherItem.height + margins.vertical;
      }
    }
    if (shouldOthersStack(item)) {
      // Insert the item into itemsAlreadyPositioned, ensuring itemsAlreadyPositioned remains sorted.
      // In the best case, we can insert an item in constant time O(1). In the worst case, we insert an item in linear time O(n).
      // In both cases, this is better than doing a naive insert and then sort, which would cost on average O(n log n).
      insertionIndex = findIndexFrom(itemsAlreadyPositioned, i => getItemStart(i) - EPSILON > itemStart, insertionIndex);
      _spliceInstanceProperty(itemsAlreadyPositioned).call(itemsAlreadyPositioned, insertionIndex, 0, item);
      if (insertionIndex < horizontalOverlapStartIndex) {
        horizontalOverlapStartIndex++;
      }
      if (insertionIndex <= horizontalOverlapEndIndex) {
        horizontalOverlapEndIndex++;
      }
      insertionIndex++;
    }

    // Keep track of the tallest item we've seen before
    const currentHeight = item.top + item.height;
    if (currentHeight > maxHeight) {
      maxHeight = currentHeight;
    }
    if (shouldBail && shouldBail()) {
      return null;
    }
  }
  return maxHeight;
}

/**
 * Test if the two provided items collide
 * The items must have parameters left, width, top, and height.
 * @param {Item} a          The first item
 * @param {Item} b          The second item
 * @param {{vertical: number}} margin
 *                          An object containing a horizontal and vertical
 *                          minimum required margin.
 * @return {boolean}        true if a and b collide, else false
 */
function checkVerticalSpatialCollision(a, b, margin) {
  return a.top - margin.vertical + EPSILON < b.top + b.height && a.top + a.height + margin.vertical - EPSILON > b.top;
}

/**
 * Find index of first item to meet predicate after a certain index.
 * If no such item is found, returns the length of the array.
 *
 * @param {any[]} arr The array
 * @param {function(item): boolean} predicate A function that should return true when a suitable item is found
 * @param {number|undefined} startIndex The index to start search from (inclusive). Optional, if not provided will search from the beginning of the array.
 *
 * @return {number}
 */
function findIndexFrom(arr, predicate, startIndex) {
  if (!startIndex) {
    startIndex = 0;
  }
  for (let i = startIndex; i < arr.length; i++) {
    if (predicate(arr[i])) {
      return i;
    }
  }
  return arr.length;
}

/**
 * Find index of last item to meet predicate within a given range.
 * If no such item is found, returns the index prior to the start of the range.
 *
 * @param {any[]} arr The array
 * @param {function(item): boolean} predicate A function that should return true when a suitable item is found
 * @param {number|undefined} startIndex The earliest index to search to (inclusive). Optional, if not provided will continue until the start of the array.
 * @param {number|undefined} endIndex The end of the search range (exclusive). The search will begin on the index prior to this value. Optional, defaults to the end of array.
 *
 * @return {number}
 */
function findLastIndexBetween(arr, predicate, startIndex, endIndex) {
  if (!startIndex) {
    startIndex = 0;
  }
  if (!endIndex) {
    endIndex = arr.length;
  }
  for (let i = endIndex - 1; i >= startIndex; i--) {
    if (predicate(arr[i])) {
      return i;
    }
  }
  return startIndex - 1;
}

/**
 * Takes an array and returns an array containing only items which meet a predicate within a given range.
 *
 * @param {any[]} arr The array
 * @param {function(item): boolean} predicate A function that should return true for items which should be included within the result
 * @param {number|undefined} startIndex The earliest index to include (inclusive). Optional, if not provided will continue until the start of the array.
 * @param {number|undefined} endIndex The end of the range to filter (exclusive). Optional, defaults to the end of array.
 *
 * @return {number}
 */
function filterBetween(arr, predicate, startIndex, endIndex) {
  if (!startIndex) {
    startIndex = 0;
  }
  if (endIndex) {
    endIndex = Math.min(endIndex, arr.length);
  } else {
    endIndex = arr.length;
  }
  const result = [];
  for (let i = startIndex; i < endIndex; i++) {
    if (predicate(arr[i])) {
      result.push(arr[i]);
    }
  }
  return result;
}

var stack$1 = /*#__PURE__*/Object.freeze({
	__proto__: null,
	nostack: nostack,
	orderByEnd: orderByEnd,
	orderByStart: orderByStart,
	stack: stack,
	stackSubgroups: stackSubgroups,
	stackSubgroupsWithInnerStack: stackSubgroupsWithInnerStack,
	substack: substack
});

const BACKGROUND$1 = "__background__"; // reserved group id for background items without group

const ReservedGroupIds$1 = {
  BACKGROUND: BACKGROUND$1
};

/**
 * @constructor Group
 */
class Group {
  /**
   * @param {number | string} groupId
   * @param {Object} data
   * @param {ItemSet} itemSet
   * @constructor Group
   */
  constructor(groupId, data, itemSet) {
    this.groupId = groupId;
    this.subgroups = {};
    this.subgroupStack = {};
    this.subgroupStackAll = false;
    this.subgroupVisibility = {};
    this.doInnerStack = false;
    this.shouldBailStackItems = false;
    this.subgroupIndex = 0;
    this.subgroupOrderer = data && data.subgroupOrder;
    this.itemSet = itemSet;
    this.isVisible = null;
    this.height = 0;
    this.stackDirty = true; // if true, items will be restacked on next redraw

    // This is a stack of functions (`() => void`) that will be executed before
    // the instance is disposed off (method `dispose`). Anything that needs to
    // be manually disposed off before garbage collection happens (or so that
    // garbage collection can happen) should be added to this stack.
    this._disposeCallbacks = [];
    if (data && data.nestedGroups) {
      this.nestedGroups = data.nestedGroups;
      if (data.showNested == false) {
        this.showNested = false;
      } else {
        this.showNested = true;
      }
    }
    if (data && data.subgroupStack) {
      if (typeof data.subgroupStack === "boolean") {
        this.doInnerStack = data.subgroupStack;
        this.subgroupStackAll = data.subgroupStack;
      } else {
        // We might be doing stacking on specific sub groups, but only
        // if at least one is set to do stacking
        for (const key in data.subgroupStack) {
          if (!Object.prototype.hasOwnProperty.call(data.subgroupStack, key)) continue;
          this.subgroupStack[key] = data.subgroupStack[key];
          this.doInnerStack = this.doInnerStack || data.subgroupStack[key];
        }
      }
    }
    if (data && data.heightMode) {
      this.heightMode = data.heightMode;
    } else {
      this.heightMode = itemSet.options.groupHeightMode;
    }
    this.nestedInGroup = null;
    this.dom = {};
    this.props = {
      label: {
        width: 0,
        height: 0
      }
    };
    this.className = null;
    this.items = {}; // items filtered by groupId of this group
    this.visibleItems = []; // items currently visible in window
    this.itemsInRange = []; // items currently in range
    this.orderedItems = {
      byStart: [],
      byEnd: []
    };
    this.checkRangedItems = false; // needed to refresh the ranged items if the window is programatically changed with NO overlap.

    const handleCheckRangedItems = () => {
      this.checkRangedItems = true;
    };
    this.itemSet.body.emitter.on("checkRangedItems", handleCheckRangedItems);
    this._disposeCallbacks.push(() => {
      this.itemSet.body.emitter.off("checkRangedItems", handleCheckRangedItems);
    });
    this._create();
    this.setData(data);
  }

  /**
   * Create DOM elements for the group
   * @private
   */
  _create() {
    const label = document.createElement("div");
    if (this.itemSet.options.groupEditable.order) {
      label.className = "vis-label draggable";
    } else {
      label.className = "vis-label";
    }
    this.dom.label = label;
    const inner = document.createElement("div");
    inner.className = "vis-inner";
    label.appendChild(inner);
    this.dom.inner = inner;
    const foreground = document.createElement("div");
    foreground.className = "vis-group";
    foreground["vis-group"] = this;
    this.dom.foreground = foreground;
    this.dom.background = document.createElement("div");
    this.dom.background.className = "vis-group";
    this.dom.axis = document.createElement("div");
    this.dom.axis.className = "vis-group";

    // create a hidden marker to detect when the Timelines container is attached
    // to the DOM, or the style of a parent of the Timeline is changed from
    // display:none is changed to visible.
    this.dom.marker = document.createElement("div");
    this.dom.marker.style.visibility = "hidden";
    this.dom.marker.style.position = "absolute";
    this.dom.marker.innerHTML = "";
    this.dom.background.appendChild(this.dom.marker);
  }

  /**
   * Set the group data for this group
   * @param {Object} data   Group data, can contain properties content and className
   */
  setData(data) {
    if (this.itemSet.groupTouchParams.isDragging) return;

    // update contents
    let content;
    let templateFunction;
    if (data && data.subgroupVisibility) {
      for (const key in data.subgroupVisibility) {
        if (!Object.prototype.hasOwnProperty.call(data.subgroupVisibility, key)) continue;
        this.subgroupVisibility[key] = data.subgroupVisibility[key];
      }
    }
    if (this.itemSet.options && this.itemSet.options.groupTemplate) {
      var _context;
      templateFunction = _bindInstanceProperty(_context = this.itemSet.options.groupTemplate).call(_context, this);
      content = templateFunction(data, this.dom.inner);
    } else {
      content = data && data.content;
    }
    if (content instanceof Element) {
      while (this.dom.inner.firstChild) {
        this.dom.inner.removeChild(this.dom.inner.firstChild);
      }
      this.dom.inner.appendChild(content);
    } else if (content instanceof Object && content.isReactComponent) ; else if (content instanceof Object) {
      templateFunction(data, this.dom.inner);
    } else if (content !== undefined && content !== null) {
      this.dom.inner.innerHTML = availableUtils.xss(content);
    } else {
      this.dom.inner.innerHTML = availableUtils.xss(this.groupId || ""); // groupId can be null
    }

    // update title
    this.dom.label.title = data && data.title || "";
    if (!this.dom.inner.firstChild) {
      availableUtils.addClassName(this.dom.inner, "vis-hidden");
    } else {
      availableUtils.removeClassName(this.dom.inner, "vis-hidden");
    }
    if (data && data.nestedGroups) {
      if (!this.nestedGroups || this.nestedGroups != data.nestedGroups) {
        this.nestedGroups = data.nestedGroups;
      }
      if (data.showNested !== undefined || this.showNested === undefined) {
        if (data.showNested == false) {
          this.showNested = false;
        } else {
          this.showNested = true;
        }
      }
      availableUtils.addClassName(this.dom.label, "vis-nesting-group");
      if (this.showNested) {
        availableUtils.removeClassName(this.dom.label, "collapsed");
        availableUtils.addClassName(this.dom.label, "expanded");
      } else {
        availableUtils.removeClassName(this.dom.label, "expanded");
        availableUtils.addClassName(this.dom.label, "collapsed");
      }
    } else if (this.nestedGroups) {
      this.nestedGroups = null;
      availableUtils.removeClassName(this.dom.label, "collapsed");
      availableUtils.removeClassName(this.dom.label, "expanded");
      availableUtils.removeClassName(this.dom.label, "vis-nesting-group");
    }
    if (data && (data.treeLevel || data.nestedInGroup)) {
      availableUtils.addClassName(this.dom.label, "vis-nested-group");
      if (data.treeLevel) {
        availableUtils.addClassName(this.dom.label, "vis-group-level-" + data.treeLevel);
      } else {
        // Nesting level is unknown, but we're sure it's at least 1
        availableUtils.addClassName(this.dom.label, "vis-group-level-unknown-but-gte1");
      }
    } else {
      availableUtils.addClassName(this.dom.label, "vis-group-level-0");
    }

    // update className
    const className = data && data.className || null;
    if (className != this.className) {
      if (this.className) {
        availableUtils.removeClassName(this.dom.label, this.className);
        availableUtils.removeClassName(this.dom.foreground, this.className);
        availableUtils.removeClassName(this.dom.background, this.className);
        availableUtils.removeClassName(this.dom.axis, this.className);
      }
      availableUtils.addClassName(this.dom.label, className);
      availableUtils.addClassName(this.dom.foreground, className);
      availableUtils.addClassName(this.dom.background, className);
      availableUtils.addClassName(this.dom.axis, className);
      this.className = className;
    }

    // update style
    if (this.style) {
      availableUtils.removeCssText(this.dom.label, this.style);
      this.style = null;
    }
    if (data && data.style) {
      availableUtils.addCssText(this.dom.label, data.style);
      this.style = data.style;
    }
  }

  /**
   * Get the width of the group label
   * @return {number} width
   */
  getLabelWidth() {
    return this.props.label.width;
  }

  /**
   * check if group has had an initial height hange
   * @returns {boolean}
   */
  _didMarkerHeightChange() {
    const markerHeight = this.dom.marker.clientHeight;
    if (markerHeight != this.lastMarkerHeight) {
      this.lastMarkerHeight = markerHeight;
      const redrawQueue = {};
      let redrawQueueLength = 0;
      _forEachInstanceProperty(availableUtils).call(availableUtils, this.items, (item, key) => {
        item.dirty = true;
        if (item.displayed) {
          const returnQueue = true;
          redrawQueue[key] = item.redraw(returnQueue);
          redrawQueueLength = redrawQueue[key].length;
        }
      });
      const needRedraw = redrawQueueLength > 0;
      if (needRedraw) {
        // redraw all regular items
        for (let i = 0; i < redrawQueueLength; i++) {
          _forEachInstanceProperty(availableUtils).call(availableUtils, redrawQueue, fns => {
            fns[i]();
          });
        }
      }
      return true;
    } else {
      return false;
    }
  }

  /**
   * calculate group dimentions and position
   * @param {number} pixels
   */
  _calculateGroupSizeAndPosition() {
    const {
      offsetTop,
      offsetLeft,
      offsetWidth
    } = this.dom.foreground;
    this.top = offsetTop;
    this.right = offsetLeft;
    this.width = offsetWidth;
  }

  /**
   * checks if should bail redraw of items
   * @returns {boolean} should bail
   */
  _shouldBailItemsRedraw() {
    const me = this;
    const timeoutOptions = this.itemSet.options.onTimeout;
    const bailOptions = {
      relativeBailingTime: this.itemSet.itemsSettingTime,
      bailTimeMs: timeoutOptions && timeoutOptions.timeoutMs,
      userBailFunction: timeoutOptions && timeoutOptions.callback,
      shouldBailStackItems: this.shouldBailStackItems
    };
    let bail = null;
    if (!this.itemSet.initialDrawDone) {
      if (bailOptions.shouldBailStackItems) {
        return true;
      }
      if (Math.abs(_Date$now() - new Date(bailOptions.relativeBailingTime)) > bailOptions.bailTimeMs) {
        if (bailOptions.userBailFunction && this.itemSet.userContinueNotBail == null) {
          bailOptions.userBailFunction(didUserContinue => {
            me.itemSet.userContinueNotBail = didUserContinue;
            bail = !didUserContinue;
          });
        } else if (me.itemSet.userContinueNotBail == false) {
          bail = true;
        } else {
          bail = false;
        }
      }
    }
    return bail;
  }

  /**
   * redraws items
   * @param {boolean} forceRestack
   * @param {boolean} lastIsVisible
   * @param {number} margin
   * @param {object} range
   * @private
   */
  _redrawItems(forceRestack, lastIsVisible, margin, range) {
    const restack = forceRestack || this.stackDirty || this.isVisible && !lastIsVisible;

    // if restacking, reposition visible items vertically
    if (restack) {
      var _context2, _context3, _context4, _context5, _context6, _context7;
      const orderedItems = {
        byEnd: _filterInstanceProperty(_context2 = this.orderedItems.byEnd).call(_context2, item => !item.isCluster),
        byStart: _filterInstanceProperty(_context3 = this.orderedItems.byStart).call(_context3, item => !item.isCluster)
      };
      const orderedClusters = {
        byEnd: [...new _Set(_filterInstanceProperty(_context4 = _mapInstanceProperty(_context5 = this.orderedItems.byEnd).call(_context5, item => item.cluster)).call(_context4, item => !!item))],
        byStart: [...new _Set(_filterInstanceProperty(_context6 = _mapInstanceProperty(_context7 = this.orderedItems.byStart).call(_context7, item => item.cluster)).call(_context6, item => !!item))]
      };

      /**
       * Get all visible items in range
       * @return {array} items
       */
      const getVisibleItems = () => {
        var _context8, _context9;
        const visibleItems = this._updateItemsInRange(orderedItems, _filterInstanceProperty(_context8 = this.visibleItems).call(_context8, item => !item.isCluster), range);
        const visibleClusters = this._updateClustersInRange(orderedClusters, _filterInstanceProperty(_context9 = this.visibleItems).call(_context9, item => item.isCluster), range);
        return [...visibleItems, ...visibleClusters];
      };

      /**
       * Get visible items grouped by subgroup
       * @param {function} orderFn An optional function to order items inside the subgroups
       * @return {Object}
       */
      const getVisibleItemsGroupedBySubgroup = orderFn => {
        let visibleSubgroupsItems = {};
        for (const subgroup in this.subgroups) {
          var _context0;
          if (!Object.prototype.hasOwnProperty.call(this.subgroups, subgroup)) continue;
          const items = _filterInstanceProperty(_context0 = this.visibleItems).call(_context0, item => item.data.subgroup === subgroup);
          visibleSubgroupsItems[subgroup] = orderFn ? _sortInstanceProperty(items).call(items, (a, b) => orderFn(a.data, b.data)) : items;
        }
        return visibleSubgroupsItems;
      };
      if (typeof this.itemSet.options.order === "function") {
        // a custom order function
        //show all items
        const me = this;
        if (this.doInnerStack && this.itemSet.options.stackSubgroups) {
          // Order the items within each subgroup
          const visibleSubgroupsItems = getVisibleItemsGroupedBySubgroup(this.itemSet.options.order);
          stackSubgroupsWithInnerStack(visibleSubgroupsItems, margin, this.subgroups);
          this.visibleItems = getVisibleItems();
          this._updateSubGroupHeights(margin);
        } else {
          var _context1, _context10, _context11, _context12;
          this.visibleItems = getVisibleItems();
          this._updateSubGroupHeights(margin);
          // order all items and force a restacking
          // order all items outside clusters and force a restacking
          const customOrderedItems = _sortInstanceProperty(_context1 = _filterInstanceProperty(_context10 = _sliceInstanceProperty(_context11 = this.visibleItems).call(_context11)).call(_context10, item => item.isCluster || !item.isCluster && !item.cluster)).call(_context1, (a, b) => {
            return me.itemSet.options.order(a.data, b.data);
          });
          this.shouldBailStackItems = stack(customOrderedItems, margin, true, _bindInstanceProperty(_context12 = this._shouldBailItemsRedraw).call(_context12, this));
        }
      } else {
        // no custom order function, lazy stacking
        this.visibleItems = getVisibleItems();
        this._updateSubGroupHeights(margin);
        if (this.itemSet.options.stack) {
          if (this.doInnerStack && this.itemSet.options.stackSubgroups) {
            const visibleSubgroupsItems = getVisibleItemsGroupedBySubgroup();
            stackSubgroupsWithInnerStack(visibleSubgroupsItems, margin, this.subgroups);
          } else {
            var _context13;
            // TODO: ugly way to access options...
            this.shouldBailStackItems = stack(this.visibleItems, margin, true, _bindInstanceProperty(_context13 = this._shouldBailItemsRedraw).call(_context13, this));
          }
        } else {
          // no stacking
          nostack(this.visibleItems, margin, this.subgroups, this.itemSet.options.stackSubgroups);
        }
      }
      for (let i = 0; i < this.visibleItems.length; i++) {
        this.visibleItems[i].repositionX();
        if (this.subgroupVisibility[this.visibleItems[i].data.subgroup] !== undefined) {
          if (!this.subgroupVisibility[this.visibleItems[i].data.subgroup]) {
            this.visibleItems[i].hide();
          }
        }
      }
      if (this.itemSet.options.cluster) {
        _forEachInstanceProperty(availableUtils).call(availableUtils, this.items, item => {
          if (item.cluster && item.displayed) {
            item.hide();
          }
        });
      }
      if (this.shouldBailStackItems) {
        this.itemSet.body.emitter.emit("destroyTimeline");
      }
      this.stackDirty = false;
    }
  }

  /**
   * check if group resized
   * @param {boolean} resized
   * @param {number} height
   * @return {boolean} did resize
   */
  _didResize(resized, height) {
    resized = availableUtils.updateProperty(this, "height", height) || resized;
    // recalculate size of label
    const labelWidth = this.dom.inner.clientWidth;
    const labelHeight = this.dom.inner.clientHeight;
    resized = availableUtils.updateProperty(this.props.label, "width", labelWidth) || resized;
    resized = availableUtils.updateProperty(this.props.label, "height", labelHeight) || resized;
    return resized;
  }

  /**
   * apply group height
   * @param {number} height
   */
  _applyGroupHeight(height) {
    this.dom.background.style.height = "".concat(height, "px");
    this.dom.foreground.style.height = "".concat(height, "px");
    this.dom.label.style.height = "".concat(height, "px");
  }

  /**
   * update vertical position of items after they are re-stacked and the height of the group is calculated
   * @param {number} margin
   */
  _updateItemsVerticalPosition(margin) {
    for (let i = 0, ii = this.visibleItems.length; i < ii; i++) {
      const item = this.visibleItems[i];
      item.repositionY(margin);
      if (!this.isVisible && this.groupId != ReservedGroupIds$1.BACKGROUND) {
        if (item.displayed) item.hide();
      }
    }
  }

  /**
   * Repaint this group
   * @param {{start: number, end: number}} range
   * @param {{item: {horizontal: number, vertical: number}, axis: number}} margin
   * @param {boolean} [forceRestack=false]  Force restacking of all items
   * @param {boolean} [returnQueue=false]  return the queue or if the group resized
   * @return {boolean} Returns true if the group is resized or the redraw queue if returnQueue=true
   */
  redraw(range, margin, forceRestack, returnQueue) {
    var _context14, _context15, _context18, _context20, _context24;
    let resized = false;
    const lastIsVisible = this.isVisible;
    let height;
    const queue = [() => {
      forceRestack = this._didMarkerHeightChange.call(this) || forceRestack;
    },
    // recalculate the height of the subgroups
    _bindInstanceProperty(_context14 = this._updateSubGroupHeights).call(_context14, this, margin),
    // calculate actual size and position
    _bindInstanceProperty(_context15 = this._calculateGroupSizeAndPosition).call(_context15, this), () => {
      var _context16;
      this.isVisible = _bindInstanceProperty(_context16 = this._isGroupVisible).call(_context16, this)(range, margin);
    }, () => {
      var _context17;
      _bindInstanceProperty(_context17 = this._redrawItems).call(_context17, this)(forceRestack, lastIsVisible, margin, range);
    },
    // update subgroups
    _bindInstanceProperty(_context18 = this._updateSubgroupsSizes).call(_context18, this), () => {
      var _context19;
      height = this.height = _bindInstanceProperty(_context19 = this._calculateHeight).call(_context19, this)(margin);
    },
    // calculate actual size and position again
    _bindInstanceProperty(_context20 = this._calculateGroupSizeAndPosition).call(_context20, this), () => {
      var _context21;
      resized = _bindInstanceProperty(_context21 = this._didResize).call(_context21, this)(resized, height);
    }, () => {
      var _context22;
      _bindInstanceProperty(_context22 = this._applyGroupHeight).call(_context22, this)(height);
    }, () => {
      var _context23;
      _bindInstanceProperty(_context23 = this._updateItemsVerticalPosition).call(_context23, this)(margin);
    }, _bindInstanceProperty(_context24 = () => {
      if (!this.isVisible && this.height) {
        resized = false;
      }
      return resized;
    }).call(_context24, this)];
    if (returnQueue) {
      return queue;
    } else {
      let result;
      _forEachInstanceProperty(queue).call(queue, fn => {
        result = fn();
      });
      return result;
    }
  }

  /**
   * recalculate the height of the subgroups
   *
   * @param {{item: timeline.Item}} margin
   * @private
   */
  _updateSubGroupHeights(margin) {
    if (_Object$keys(this.subgroups).length > 0) {
      const me = this;
      this._resetSubgroups();
      _forEachInstanceProperty(availableUtils).call(availableUtils, this.visibleItems, item => {
        if (item.data.subgroup !== undefined) {
          me.subgroups[item.data.subgroup].height = Math.max(me.subgroups[item.data.subgroup].height, item.height + margin.item.vertical);
          me.subgroups[item.data.subgroup].visible = typeof this.subgroupVisibility[item.data.subgroup] === "undefined" ? true : Boolean(this.subgroupVisibility[item.data.subgroup]);
        }
      });
    }
  }

  /**
   * check if group is visible
   *
   * @param {timeline.Range} range
   * @param {{axis: timeline.DataAxis}} margin
   * @returns {boolean} is visible
   * @private
   */
  _isGroupVisible(range, margin) {
    return this.top <= range.body.domProps.centerContainer.height - range.body.domProps.scrollTop + margin.axis && this.top + this.height + margin.axis >= -range.body.domProps.scrollTop;
  }

  /**
   * recalculate the height of the group
   * @param {{item: {horizontal: number, vertical: number}, axis: number}} margin
   * @returns {number} Returns the height
   * @private
   */
  _calculateHeight(margin) {
    // recalculate the height of the group
    let height;
    let items;
    if (this.heightMode === "fixed") {
      items = availableUtils.toArray(this.items);
    } else {
      // default or 'auto'
      items = this.visibleItems;
    }
    if (!this.isVisible && this.height) {
      height = Math.max(this.height, this.props.label.height);
    } else if (items.length > 0) {
      let min = items[0].top;
      let max = items[0].top + items[0].height;
      _forEachInstanceProperty(availableUtils).call(availableUtils, items, item => {
        min = Math.min(min, item.top);
        max = Math.max(max, item.top + item.height);
      });
      if (min > margin.axis) {
        // there is an empty gap between the lowest item and the axis
        const offset = min - margin.axis;
        max -= offset;
        _forEachInstanceProperty(availableUtils).call(availableUtils, items, item => {
          item.top -= offset;
        });
      }
      height = Math.ceil(max + margin.item.vertical / 2);
      if (this.heightMode !== "fitItems") {
        height = Math.max(height, this.props.label.height);
      }
    } else {
      height = this.props.label.height;
    }
    return height;
  }

  /**
   * Show this group: attach to the DOM
   */
  show() {
    if (!this.dom.label.parentNode) {
      this.itemSet.dom.labelSet.appendChild(this.dom.label);
    }
    if (!this.dom.foreground.parentNode) {
      this.itemSet.dom.foreground.appendChild(this.dom.foreground);
    }
    if (!this.dom.background.parentNode) {
      this.itemSet.dom.background.appendChild(this.dom.background);
    }
    if (!this.dom.axis.parentNode) {
      this.itemSet.dom.axis.appendChild(this.dom.axis);
    }
  }

  /**
   * Hide this group: remove from the DOM
   */
  hide() {
    const label = this.dom.label;
    if (label.parentNode) {
      label.parentNode.removeChild(label);
    }
    const foreground = this.dom.foreground;
    if (foreground.parentNode) {
      foreground.parentNode.removeChild(foreground);
    }
    const background = this.dom.background;
    if (background.parentNode) {
      background.parentNode.removeChild(background);
    }
    const axis = this.dom.axis;
    if (axis.parentNode) {
      axis.parentNode.removeChild(axis);
    }
  }

  /**
   * Add an item to the group
   * @param {Item} item
   */
  add(item) {
    var _context25;
    this.items[item.id] = item;
    item.setParent(this);
    this.stackDirty = true;
    // add to
    if (item.data.subgroup !== undefined) {
      this._addToSubgroup(item);
      this.orderSubgroups();
    }
    if (!_includesInstanceProperty(_context25 = this.visibleItems).call(_context25, item)) {
      const range = this.itemSet.body.range; // TODO: not nice accessing the range like this
      this._checkIfVisible(item, this.visibleItems, range);
    }
  }

  /**
   * add item to subgroup
   * @param {object} item
   * @param {string} subgroupId
   */
  _addToSubgroup(item) {
    let subgroupId = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : item.data.subgroup;
    if (subgroupId != undefined && this.subgroups[subgroupId] === undefined) {
      this.subgroups[subgroupId] = {
        height: 0,
        top: 0,
        start: item.data.start,
        end: item.data.end || item.data.start,
        visible: false,
        index: this.subgroupIndex,
        items: [],
        stack: this.subgroupStackAll || this.subgroupStack[subgroupId] || false
      };
      this.subgroupIndex++;
    }
    if (new Date(item.data.start) < new Date(this.subgroups[subgroupId].start)) {
      this.subgroups[subgroupId].start = item.data.start;
    }
    const itemEnd = item.data.end || item.data.start;
    if (new Date(itemEnd) > new Date(this.subgroups[subgroupId].end)) {
      this.subgroups[subgroupId].end = itemEnd;
    }
    this.subgroups[subgroupId].items.push(item);
  }

  /**
   * update subgroup sizes
   */
  _updateSubgroupsSizes() {
    const me = this;
    if (me.subgroups) {
      for (const subgroup in me.subgroups) {
        var _context26;
        if (!Object.prototype.hasOwnProperty.call(me.subgroups, subgroup)) continue;
        const initialEnd = me.subgroups[subgroup].items[0].data.end || me.subgroups[subgroup].items[0].data.start;
        let newStart = me.subgroups[subgroup].items[0].data.start;
        let newEnd = initialEnd - 1;
        _forEachInstanceProperty(_context26 = me.subgroups[subgroup].items).call(_context26, item => {
          if (new Date(item.data.start) < new Date(newStart)) {
            newStart = item.data.start;
          }
          const itemEnd = item.data.end || item.data.start;
          if (new Date(itemEnd) > new Date(newEnd)) {
            newEnd = itemEnd;
          }
        });
        me.subgroups[subgroup].start = newStart;
        me.subgroups[subgroup].end = new Date(newEnd - 1); // -1 to compensate for colliding end to start subgroups;
      }
    }
  }

  /**
   * order subgroups
   */
  orderSubgroups() {
    if (this.subgroupOrderer !== undefined) {
      const sortArray = [];
      if (typeof this.subgroupOrderer == "string") {
        for (const subgroup in this.subgroups) {
          if (!Object.prototype.hasOwnProperty.call(this.subgroups, subgroup)) continue;
          sortArray.push({
            subgroup,
            sortField: this.subgroups[subgroup].items[0].data[this.subgroupOrderer]
          });
        }
        _sortInstanceProperty(sortArray).call(sortArray, (a, b) => a.sortField - b.sortField);
      } else if (typeof this.subgroupOrderer == "function") {
        for (const subgroup in this.subgroups) {
          if (!Object.prototype.hasOwnProperty.call(this.subgroups, subgroup)) continue;
          sortArray.push(this.subgroups[subgroup].items[0].data);
        }
        _sortInstanceProperty(sortArray).call(sortArray, this.subgroupOrderer);
      }
      if (sortArray.length > 0) {
        for (let i = 0; i < sortArray.length; i++) {
          this.subgroups[sortArray[i].subgroup].index = i;
        }
      }
    }
  }

  /**
   * add item to subgroup
   */
  _resetSubgroups() {
    for (const subgroup in this.subgroups) {
      if (!Object.prototype.hasOwnProperty.call(this.subgroups, subgroup)) continue;
      this.subgroups[subgroup].visible = false;
      this.subgroups[subgroup].height = 0;
    }
  }

  /**
   * Remove an item from the group
   * @param {Item} item
   */
  remove(item) {
    var _context27, _context28;
    delete this.items[item.id];
    item.setParent(null);
    this.stackDirty = true;

    // remove from visible items
    const index = _indexOfInstanceProperty(_context27 = this.visibleItems).call(_context27, item);
    if (index != -1) _spliceInstanceProperty(_context28 = this.visibleItems).call(_context28, index, 1);
    if (item.data.subgroup !== undefined) {
      this._removeFromSubgroup(item);
      this.orderSubgroups();
    }
  }

  /**
   * remove item from subgroup
   * @param {object} item
   * @param {string} subgroupId
   */
  _removeFromSubgroup(item) {
    let subgroupId = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : item.data.subgroup;
    if (subgroupId != undefined) {
      const subgroup = this.subgroups[subgroupId];
      if (subgroup) {
        var _context29;
        const itemIndex = _indexOfInstanceProperty(_context29 = subgroup.items).call(_context29, item);
        //  Check the item is actually in this subgroup. How should items not in the group be handled?
        if (itemIndex >= 0) {
          var _context30;
          _spliceInstanceProperty(_context30 = subgroup.items).call(_context30, itemIndex, 1);
          if (!subgroup.items.length) {
            delete this.subgroups[subgroupId];
          } else {
            this._updateSubgroupsSizes();
          }
        }
      }
    }
  }

  /**
   * Remove an item from the corresponding DataSet
   * @param {Item} item
   */
  removeFromDataSet(item) {
    this.itemSet.removeItem(item.id);
  }

  /**
   * Reorder the items
   */
  order() {
    const array = availableUtils.toArray(this.items);
    const startArray = [];
    const endArray = [];
    for (let i = 0; i < array.length; i++) {
      if (array[i].data.end !== undefined) {
        endArray.push(array[i]);
      }
      startArray.push(array[i]);
    }
    this.orderedItems = {
      byStart: startArray,
      byEnd: endArray
    };
    orderByStart(this.orderedItems.byStart);
    orderByEnd(this.orderedItems.byEnd);
  }

  /**
   * Update the visible items
   * @param {{byStart: Item[], byEnd: Item[]}} orderedItems   All items ordered by start date and by end date
   * @param {Item[]} oldVisibleItems                          The previously visible items.
   * @param {{start: number, end: number}} range              Visible range
   * @return {Item[]} visibleItems                            The new visible items.
   * @private
   */
  _updateItemsInRange(orderedItems, oldVisibleItems, range) {
    const visibleItems = [];
    const visibleItemsLookup = {}; // we keep this to quickly look up if an item already exists in the list without using indexOf on visibleItems

    if (!this.isVisible && this.height !== undefined && this.groupId != ReservedGroupIds$1.BACKGROUND) {
      for (let i = 0; i < oldVisibleItems.length; i++) {
        var item = oldVisibleItems[i];
        if (item.displayed) item.hide();
      }
      return visibleItems;
    }
    const interval = (range.end - range.start) / 4;
    const lowerBound = range.start - interval;
    const upperBound = range.end + interval;

    // this function is used to do the binary search for items having start date only.
    const startSearchFunction = value => {
      if (value < lowerBound) {
        return -1;
      } else if (value <= upperBound) {
        return 0;
      } else {
        return 1;
      }
    };

    // this function is used to do the binary search for items having start and end dates (range).
    const endSearchFunction = data => {
      const {
        start,
        end
      } = data;
      if (end < lowerBound) {
        return -1;
      } else if (start <= upperBound) {
        return 0;
      } else {
        return 1;
      }
    };

    // first check if the items that were in view previously are still in view.
    // IMPORTANT: this handles the case for the items with startdate before the window and enddate after the window!
    // also cleans up invisible items.
    if (oldVisibleItems.length > 0) {
      for (let i = 0; i < oldVisibleItems.length; i++) {
        this._checkIfVisibleWithReference(oldVisibleItems[i], visibleItems, visibleItemsLookup, range);
      }
    }

    // we do a binary search for the items that have only start values.
    const initialPosByStart = availableUtils.binarySearchCustom(orderedItems.byStart, startSearchFunction, "data", "start");

    // trace the visible items from the inital start pos both ways until an invisible item is found, we only look at the start values.
    this._traceVisible(initialPosByStart, orderedItems.byStart, visibleItems, visibleItemsLookup, item => item.data.start < lowerBound || item.data.start > upperBound);

    // if the window has changed programmatically without overlapping the old window, the ranged items with start < lowerBound and end > upperbound are not shown.
    // We therefore have to brute force check all items in the byEnd list
    if (this.checkRangedItems == true) {
      this.checkRangedItems = false;
      for (let i = 0; i < orderedItems.byEnd.length; i++) {
        this._checkIfVisibleWithReference(orderedItems.byEnd[i], visibleItems, visibleItemsLookup, range);
      }
    } else {
      // we do a binary search for the items that have defined end times.
      const initialPosByEnd = availableUtils.binarySearchCustom(orderedItems.byEnd, endSearchFunction, "data");

      // trace the visible items from the inital start pos both ways until an invisible item is found, we only look at the end values.
      this._traceVisible(initialPosByEnd, orderedItems.byEnd, visibleItems, visibleItemsLookup, item => item.data.end < lowerBound || item.data.start > upperBound);
    }
    this._sortVisibleItems(orderedItems.byStart, visibleItems, visibleItemsLookup);
    const redrawQueue = {};
    let redrawQueueLength = 0;
    for (let i = 0; i < visibleItems.length; i++) {
      const item = visibleItems[i];
      if (!item.displayed) {
        const returnQueue = true;
        redrawQueue[i] = item.redraw(returnQueue);
        redrawQueueLength = redrawQueue[i].length;
      }
    }
    const needRedraw = redrawQueueLength > 0;
    if (needRedraw) {
      // redraw all regular items
      for (let j = 0; j < redrawQueueLength; j++) {
        _forEachInstanceProperty(availableUtils).call(availableUtils, redrawQueue, fns => {
          fns[j]();
        });
      }
    }
    for (let i = 0; i < visibleItems.length; i++) {
      visibleItems[i].repositionX();
    }
    return visibleItems;
  }

  /**
   * trace visible items in group
   * @param {number} initialPos
   * @param {array} items
   * @param {aray} visibleItems
   * @param {object} visibleItemsLookup
   * @param {function} breakCondition
   */
  _traceVisible(initialPos, items, visibleItems, visibleItemsLookup, breakCondition) {
    if (initialPos != -1) {
      for (let i = initialPos; i >= 0; i--) {
        let item = items[i];
        if (breakCondition(item)) {
          break;
        } else {
          if (!(item.isCluster && !item.hasItems()) && !item.cluster) {
            if (visibleItemsLookup[item.id] === undefined) {
              visibleItemsLookup[item.id] = true;
              visibleItems.unshift(item);
            }
          }
        }
      }
      for (let i = initialPos + 1; i < items.length; i++) {
        let item = items[i];
        if (breakCondition(item)) {
          break;
        } else {
          if (!(item.isCluster && !item.hasItems()) && !item.cluster) {
            if (visibleItemsLookup[item.id] === undefined) {
              visibleItemsLookup[item.id] = true;
              visibleItems.push(item);
            }
          }
        }
      }
    }
  }

  /**
   * by-ref reordering of visibleItems array to match
   * the specified item superset order
   * @param {array} orderedItems
   * @param {aray} visibleItems
   * @param {object} visibleItemsLookup
   */
  _sortVisibleItems(orderedItems, visibleItems, visibleItemsLookup) {
    visibleItems.length = 0; // Clear visibleItems array in-place
    for (let i = 0; i < orderedItems.length; i++) {
      let item = orderedItems[i];
      if (visibleItemsLookup[item.id]) {
        visibleItems.push(item);
      }
    }
  }

  /**
   * this function is very similar to the _checkIfInvisible() but it does not
   * return booleans, hides the item if it should not be seen and always adds to
   * the visibleItems.
   * this one is for brute forcing and hiding.
   *
   * @param {Item} item
   * @param {Array} visibleItems
   * @param {{start:number, end:number}} range
   * @private
   */
  _checkIfVisible(item, visibleItems, range) {
    if (item.isVisible(range)) {
      if (!item.displayed) item.show();
      // reposition item horizontally
      item.repositionX();
      visibleItems.push(item);
    } else {
      if (item.displayed) item.hide();
    }
  }

  /**
   * this function is very similar to the _checkIfInvisible() but it does not
   * return booleans, hides the item if it should not be seen and always adds to
   * the visibleItems.
   * this one is for brute forcing and hiding.
   *
   * @param {Item} item
   * @param {Array.<timeline.Item>} visibleItems
   * @param {Object<number, boolean>} visibleItemsLookup
   * @param {{start:number, end:number}} range
   * @private
   */
  _checkIfVisibleWithReference(item, visibleItems, visibleItemsLookup, range) {
    if (item.isVisible(range)) {
      if (visibleItemsLookup[item.id] === undefined) {
        visibleItemsLookup[item.id] = true;
        visibleItems.push(item);
      }
    } else {
      if (item.displayed) item.hide();
    }
  }

  /**
   * Update the visible items
   * @param {array} orderedClusters
   * @param {array} oldVisibleClusters
   * @param {{start: number, end: number}} range
   * @return {Item[]} visibleItems
   * @private
   */
  _updateClustersInRange(orderedClusters, oldVisibleClusters, range) {
    // Clusters can overlap each other so we cannot use binary search here
    const visibleClusters = [];
    const visibleClustersLookup = {}; // we keep this to quickly look up if an item already exists in the list without using indexOf on visibleItems

    if (oldVisibleClusters.length > 0) {
      for (let i = 0; i < oldVisibleClusters.length; i++) {
        this._checkIfVisibleWithReference(oldVisibleClusters[i], visibleClusters, visibleClustersLookup, range);
      }
    }
    for (let i = 0; i < orderedClusters.byStart.length; i++) {
      this._checkIfVisibleWithReference(orderedClusters.byStart[i], visibleClusters, visibleClustersLookup, range);
    }
    for (let i = 0; i < orderedClusters.byEnd.length; i++) {
      this._checkIfVisibleWithReference(orderedClusters.byEnd[i], visibleClusters, visibleClustersLookup, range);
    }
    const redrawQueue = {};
    let redrawQueueLength = 0;
    for (let i = 0; i < visibleClusters.length; i++) {
      const item = visibleClusters[i];
      if (!item.displayed) {
        const returnQueue = true;
        redrawQueue[i] = item.redraw(returnQueue);
        redrawQueueLength = redrawQueue[i].length;
      }
    }
    const needRedraw = redrawQueueLength > 0;
    if (needRedraw) {
      // redraw all regular items
      for (var j = 0; j < redrawQueueLength; j++) {
        _forEachInstanceProperty(availableUtils).call(availableUtils, redrawQueue, function (fns) {
          fns[j]();
        });
      }
    }
    for (let i = 0; i < visibleClusters.length; i++) {
      visibleClusters[i].repositionX();
    }
    return visibleClusters;
  }

  /**
   * change item subgroup
   * @param {object} item
   * @param {string} oldSubgroup
   * @param {string} newSubgroup
   */
  changeSubgroup(item, oldSubgroup, newSubgroup) {
    this._removeFromSubgroup(item, oldSubgroup);
    this._addToSubgroup(item, newSubgroup);
    this.orderSubgroups();
  }

  /**
   * Call this method before you lose the last reference to an instance of this.
   * It will remove listeners etc.
   */
  dispose() {
    this.hide();
    let disposeCallback;
    while (disposeCallback = this._disposeCallbacks.pop()) {
      disposeCallback();
    }
  }
}

/**
 * @constructor BackgroundGroup
 * @extends Group
 */
class BackgroundGroup extends Group {
  /**
   * @param {number | string} groupId
   * @param {Object} data
   * @param {ItemSet} itemSet
   */
  constructor(groupId, data, itemSet) {
    super(groupId, data, itemSet);
    // Group.call(this, groupId, data, itemSet);

    this.width = 0;
    this.height = 0;
    this.top = 0;
    this.left = 0;
  }

  /**
   * Repaint this group
   * @param {{start: number, end: number}} range
   * @param {{item: {horizontal: number, vertical: number}, axis: number}} margin
   * @return {boolean} Returns true if the group is resized
   */
  redraw(range, margin) {
    const resized = false;
    this.visibleItems = this._updateItemsInRange(this.orderedItems, this.visibleItems, range);

    // calculate actual size
    this.width = this.dom.background.offsetWidth;

    // apply new height (just always zero for BackgroundGroup
    this.dom.background.style.height = "0";

    // update vertical position of items after they are re-stacked and the height of the group is calculated
    for (let i = 0, ii = this.visibleItems.length; i < ii; i++) {
      const item = this.visibleItems[i];
      item.repositionY(margin);
    }
    return resized;
  }

  /**
   * Show this group: attach to the DOM
   */
  show() {
    if (!this.dom.background.parentNode) {
      this.itemSet.dom.background.appendChild(this.dom.background);
    }
  }
}

/**
 * Item
 */
class Item {
  /**
   * @constructor Item
   * @param {Object} data             Object containing (optional) parameters type,
   *                                  start, end, content, group, className.
   * @param {{toScreen: function, toTime: function}} conversion
   *                                  Conversion functions from time to screen and vice versa
   * @param {Object} options          Configuration options
   *                                  // TODO: describe available options
   */
  constructor(data, conversion, options) {
    var _context;
    this.id = null;
    this.parent = null;
    this.data = data;
    this.dom = null;
    this.conversion = conversion || {};
    this.defaultOptions = {
      locales,
      locale: "en"
    };
    this.options = availableUtils.extend({}, this.defaultOptions, options);
    this.options.locales = availableUtils.extend({}, locales, this.options.locales);
    const defaultLocales = this.defaultOptions.locales[this.defaultOptions.locale];
    _forEachInstanceProperty(_context = _Object$keys(this.options.locales)).call(_context, locale => {
      this.options.locales[locale] = availableUtils.extend({}, defaultLocales, this.options.locales[locale]);
    });
    this.selected = false;
    this.displayed = false;
    this.groupShowing = true;
    this.selectable = options && options.selectable || false;
    this.dirty = true;
    this.top = null;
    this.right = null;
    this.left = null;
    this.width = null;
    this.height = null;
    this.setSelectability(data);
    this.editable = null;
    this._updateEditStatus();
  }

  /**
   * Select current item
   */
  select() {
    if (this.selectable) {
      this.selected = true;
      this.dirty = true;
      if (this.displayed) this.redraw();
    }
  }

  /**
   * Unselect current item
   */
  unselect() {
    this.selected = false;
    this.dirty = true;
    if (this.displayed) this.redraw();
  }

  /**
   * Set data for the item. Existing data will be updated. The id should not
   * be changed. When the item is displayed, it will be redrawn immediately.
   * @param {Object} data
   */
  setData(data) {
    const groupChanged = data.group != undefined && this.data.group != data.group;
    if (groupChanged && this.parent != null) {
      this.parent.itemSet._moveToGroup(this, data.group);
    }
    this.setSelectability(data);
    if (this.parent) {
      this.parent.stackDirty = true;
    }
    const subGroupChanged = data.subgroup != undefined && this.data.subgroup != data.subgroup;
    if (subGroupChanged && this.parent != null) {
      this.parent.changeSubgroup(this, this.data.subgroup, data.subgroup);
    }
    this.data = data;
    this._updateEditStatus();
    this.dirty = true;
    if (this.displayed) this.redraw();
  }

  /**
   * Set whether the item can be selected.
   * Can only be set/unset if the timeline's `selectable` configuration option is `true`.
   * @param {Object} data `data` from `constructor` and `setData`
   */
  setSelectability(data) {
    if (data) {
      this.selectable = typeof data.selectable === "undefined" ? true : Boolean(data.selectable);
    }
  }

  /**
   * Set a parent for the item
   * @param {Group} parent
   */
  setParent(parent) {
    if (this.displayed) {
      this.hide();
      this.parent = parent;
      if (this.parent) {
        this.show();
      }
    } else {
      this.parent = parent;
    }
  }

  /**
   * Check whether this item is visible inside given range
   * @returns {boolean} True if visible
   */
  isVisible() {
    return false;
  }

  /**
   * Show the Item in the DOM (when not already visible)
   * @return {Boolean} changed
   */
  show() {
    return false;
  }

  /**
   * Hide the Item from the DOM (when visible)
   * @return {Boolean} changed
   */
  hide() {
    return false;
  }

  /**
   * Repaint the item
   */
  redraw() {
    // should be implemented by the item
  }

  /**
   * Reposition the Item horizontally
   */
  repositionX() {
    // should be implemented by the item
  }

  /**
   * Reposition the Item vertically
   */
  repositionY() {
    // should be implemented by the item
  }

  /**
   * Repaint a drag area on the center of the item when the item is selected
   * @protected
   */
  _repaintDragCenter() {
    if (this.selected && this.editable.updateTime && !this.dom.dragCenter) {
      var _context2, _context3;
      const me = this;
      // create and show drag area
      const dragCenter = document.createElement("div");
      dragCenter.className = "vis-drag-center";
      dragCenter.dragCenterItem = this;
      this.hammerDragCenter = new Hammer(dragCenter);
      this.hammerDragCenter.on("tap", event => {
        me.parent.itemSet.body.emitter.emit("click", {
          event,
          item: me.id
        });
      });
      this.hammerDragCenter.on("doubletap", event => {
        event.stopPropagation();
        me.parent.itemSet._onUpdateItem(me);
        me.parent.itemSet.body.emitter.emit("doubleClick", {
          event,
          item: me.id
        });
      });
      this.hammerDragCenter.on("panstart", event => {
        // do not allow this event to propagate to the Range
        event.stopPropagation();
        me.parent.itemSet._onDragStart(event);
      });
      this.hammerDragCenter.on("panmove", _bindInstanceProperty(_context2 = me.parent.itemSet._onDrag).call(_context2, me.parent.itemSet));
      this.hammerDragCenter.on("panend", _bindInstanceProperty(_context3 = me.parent.itemSet._onDragEnd).call(_context3, me.parent.itemSet));
      // delay addition on item click for trackpads...
      this.hammerDragCenter.get("press").set({
        time: 10000
      });
      if (this.dom.box) {
        if (this.dom.dragLeft) {
          this.dom.box.insertBefore(dragCenter, this.dom.dragLeft);
        } else {
          this.dom.box.appendChild(dragCenter);
        }
      } else if (this.dom.point) {
        this.dom.point.appendChild(dragCenter);
      }
      this.dom.dragCenter = dragCenter;
    } else if (!this.selected && this.dom.dragCenter) {
      // delete drag area
      if (this.dom.dragCenter.parentNode) {
        this.dom.dragCenter.parentNode.removeChild(this.dom.dragCenter);
      }
      this.dom.dragCenter = null;
      if (this.hammerDragCenter) {
        this.hammerDragCenter.destroy();
        this.hammerDragCenter = null;
      }
    }
  }

  /**
   * Repaint a delete button on the top right of the item when the item is selected
   * @param {HTMLElement} anchor
   * @protected
   */
  _repaintDeleteButton(anchor) {
    const editable = (this.options.editable.overrideItems || this.editable == null) && this.options.editable.remove || !this.options.editable.overrideItems && this.editable != null && this.editable.remove;
    if (this.selected && editable && !this.dom.deleteButton) {
      // create and show button
      const me = this;
      const deleteButton = document.createElement("div");
      if (this.options.rtl) {
        deleteButton.className = "vis-delete-rtl";
      } else {
        deleteButton.className = "vis-delete";
      }
      let optionsLocale = this.options.locales[this.options.locale];
      if (!optionsLocale) {
        if (!this.warned) {
          console.warn("WARNING: options.locales['".concat(this.options.locale, "'] not found. See https://visjs.github.io/vis-timeline/docs/timeline/#Localization"));
          this.warned = true;
        }
        optionsLocale = this.options.locales["en"]; // fall back on english when not available
      }
      deleteButton.title = optionsLocale.deleteSelected;

      // TODO: be able to destroy the delete button
      this.hammerDeleteButton = new Hammer(deleteButton).on("tap", event => {
        event.stopPropagation();
        me.parent.removeFromDataSet(me);
      });
      anchor.appendChild(deleteButton);
      this.dom.deleteButton = deleteButton;
    } else if ((!this.selected || !editable) && this.dom.deleteButton) {
      // remove button
      if (this.dom.deleteButton.parentNode) {
        this.dom.deleteButton.parentNode.removeChild(this.dom.deleteButton);
      }
      this.dom.deleteButton = null;
      if (this.hammerDeleteButton) {
        this.hammerDeleteButton.destroy();
        this.hammerDeleteButton = null;
      }
    }
  }

  /**
   * Repaint a onChange tooltip on the top right of the item when the item is selected
   * @param {HTMLElement} anchor
   * @protected
   */
  _repaintOnItemUpdateTimeTooltip(anchor) {
    if (!this.options.tooltipOnItemUpdateTime) return;
    const editable = (this.options.editable.updateTime || this.data.editable === true) && this.data.editable !== false;
    if (this.selected && editable && !this.dom.onItemUpdateTimeTooltip) {
      const onItemUpdateTimeTooltip = document.createElement("div");
      onItemUpdateTimeTooltip.className = "vis-onUpdateTime-tooltip";
      anchor.appendChild(onItemUpdateTimeTooltip);
      this.dom.onItemUpdateTimeTooltip = onItemUpdateTimeTooltip;
    } else if (!this.selected && this.dom.onItemUpdateTimeTooltip) {
      // remove button
      if (this.dom.onItemUpdateTimeTooltip.parentNode) {
        this.dom.onItemUpdateTimeTooltip.parentNode.removeChild(this.dom.onItemUpdateTimeTooltip);
      }
      this.dom.onItemUpdateTimeTooltip = null;
    }

    // position onChange tooltip
    if (this.dom.onItemUpdateTimeTooltip) {
      // only show when editing
      this.dom.onItemUpdateTimeTooltip.style.visibility = this.parent.itemSet.touchParams.itemIsDragging ? "visible" : "hidden";

      // position relative to item's content
      this.dom.onItemUpdateTimeTooltip.style.transform = "translateX(-50%)";
      this.dom.onItemUpdateTimeTooltip.style.left = "50%";

      // position above or below the item depending on the item's position in the window
      const tooltipOffset = 50; // TODO: should be tooltip height (depends on template)
      const scrollTop = this.parent.itemSet.body.domProps.scrollTop;

      // TODO: this.top for orientation:true is actually the items distance from the bottom...
      // (should be this.bottom)
      let itemDistanceFromTop;
      if (this.options.orientation.item == "top") {
        itemDistanceFromTop = this.top;
      } else {
        itemDistanceFromTop = this.parent.height - this.top - this.height;
      }
      const isCloseToTop = itemDistanceFromTop + this.parent.top - tooltipOffset < -scrollTop;
      if (isCloseToTop) {
        this.dom.onItemUpdateTimeTooltip.style.bottom = "";
        this.dom.onItemUpdateTimeTooltip.style.top = "".concat(this.height + 2, "px");
      } else {
        this.dom.onItemUpdateTimeTooltip.style.top = "";
        this.dom.onItemUpdateTimeTooltip.style.bottom = "".concat(this.height + 2, "px");
      }

      // handle tooltip content
      let content;
      let templateFunction;
      if (this.options.tooltipOnItemUpdateTime && this.options.tooltipOnItemUpdateTime.template) {
        var _context4;
        templateFunction = _bindInstanceProperty(_context4 = this.options.tooltipOnItemUpdateTime.template).call(_context4, this);
        content = templateFunction(this.data);
      } else {
        content = "start: ".concat(moment$2(this.data.start).format("MM/DD/YYYY hh:mm"));
        if (this.data.end) {
          content += "<br> end: ".concat(moment$2(this.data.end).format("MM/DD/YYYY hh:mm"));
        }
      }
      this.dom.onItemUpdateTimeTooltip.innerHTML = availableUtils.xss(content);
    }
  }

  /**
   * get item data
   * @return {object}
   * @private
   */
  _getItemData() {
    return this.parent.itemSet.itemsData.get(this.id);
  }

  /**
   * Set HTML contents for the item
   * @param {Element} element   HTML element to fill with the contents
   * @private
   */
  _updateContents(element) {
    let content;
    let changed;
    let templateFunction;
    let itemVisibleFrameContent;
    let visibleFrameTemplateFunction;
    const itemData = this._getItemData(); // get a clone of the data from the dataset

    const frameElement = this.dom.box || this.dom.point;
    const itemVisibleFrameContentElement = frameElement.getElementsByClassName("vis-item-visible-frame")[0];
    if (this.options.visibleFrameTemplate) {
      var _context5;
      visibleFrameTemplateFunction = _bindInstanceProperty(_context5 = this.options.visibleFrameTemplate).call(_context5, this);
      itemVisibleFrameContent = availableUtils.xss(visibleFrameTemplateFunction(itemData, itemVisibleFrameContentElement));
    } else {
      itemVisibleFrameContent = "";
    }
    if (itemVisibleFrameContentElement) {
      if (itemVisibleFrameContent instanceof Object && !(itemVisibleFrameContent instanceof Element)) {
        visibleFrameTemplateFunction(itemData, itemVisibleFrameContentElement);
      } else {
        changed = this._contentToString(this.itemVisibleFrameContent) !== this._contentToString(itemVisibleFrameContent);
        if (changed) {
          // only replace the content when changed
          if (itemVisibleFrameContent instanceof Element) {
            itemVisibleFrameContentElement.innerHTML = "";
            itemVisibleFrameContentElement.appendChild(itemVisibleFrameContent);
          } else if (itemVisibleFrameContent != undefined) {
            itemVisibleFrameContentElement.innerHTML = availableUtils.xss(itemVisibleFrameContent);
          } else {
            if (!(this.data.type == "background" && this.data.content === undefined)) {
              throw new Error("Property \"content\" missing in item ".concat(this.id));
            }
          }
          this.itemVisibleFrameContent = itemVisibleFrameContent;
        }
      }
    }
    if (this.options.template) {
      var _context6;
      templateFunction = _bindInstanceProperty(_context6 = this.options.template).call(_context6, this);
      content = templateFunction(itemData, element, this.data);
    } else {
      content = this.data.content;
    }
    if (content instanceof Object && !(content instanceof Element)) {
      templateFunction(itemData, element);
    } else {
      changed = this._contentToString(this.content) !== this._contentToString(content);
      if (changed) {
        // only replace the content when changed
        if (content instanceof Element) {
          element.innerHTML = "";
          element.appendChild(content);
        } else if (content != undefined) {
          element.innerHTML = availableUtils.xss(content);
        } else {
          if (!(this.data.type == "background" && this.data.content === undefined)) {
            throw new Error("Property \"content\" missing in item ".concat(this.id));
          }
        }
        this.content = content;
      }
    }
  }

  /**
   * Process dataAttributes timeline option and set as data- attributes on dom.content
   * @param {Element} element   HTML element to which the attributes will be attached
   * @private
   */
  _updateDataAttributes(element) {
    if (this.options.dataAttributes && this.options.dataAttributes.length > 0) {
      let attributes = [];
      if (_Array$isArray(this.options.dataAttributes)) {
        attributes = this.options.dataAttributes;
      } else if (this.options.dataAttributes == "all") {
        attributes = _Object$keys(this.data);
      } else {
        return;
      }
      for (const name of attributes) {
        const value = this.data[name];
        if (value != null) {
          element.setAttribute("data-".concat(name), value);
        } else {
          element.removeAttribute("data-".concat(name));
        }
      }
    }
  }

  /**
   * Update custom styles of the element
   * @param {Element} element
   * @private
   */
  _updateStyle(element) {
    // remove old styles
    if (this.style) {
      availableUtils.removeCssText(element, this.style);
      this.style = null;
    }

    // append new styles
    if (this.data.style) {
      availableUtils.addCssText(element, this.data.style);
      this.style = this.data.style;
    }
  }

  /**
   * Stringify the items contents
   * @param {string | Element | undefined} content
   * @returns {string | undefined}
   * @private
   */
  _contentToString(content) {
    if (typeof content === "string") return content;
    if (content && "outerHTML" in content) return content.outerHTML;
    return content;
  }

  /**
   * Update the editability of this item.
   */
  _updateEditStatus() {
    if (this.options) {
      if (typeof this.options.editable === "boolean") {
        this.editable = {
          updateTime: this.options.editable,
          updateGroup: this.options.editable,
          remove: this.options.editable
        };
      } else if (typeof this.options.editable === "object") {
        this.editable = {};
        availableUtils.selectiveExtend(["updateTime", "updateGroup", "remove"], this.editable, this.options.editable);
      }
    }
    // Item data overrides, except if options.editable.overrideItems is set.
    if (!this.options || !this.options.editable || this.options.editable.overrideItems !== true) {
      if (this.data) {
        if (typeof this.data.editable === "boolean") {
          this.editable = {
            updateTime: this.data.editable,
            updateGroup: this.data.editable,
            remove: this.data.editable
          };
        } else if (typeof this.data.editable === "object") {
          // TODO: in timeline.js 5.0, we should change this to not reset options from the timeline configuration.
          // Basically just remove the next line...
          this.editable = {};
          availableUtils.selectiveExtend(["updateTime", "updateGroup", "remove"], this.editable, this.data.editable);
        }
      }
    }
  }

  /**
   * Return the width of the item left from its start date
   * @return {number}
   */
  getWidthLeft() {
    return 0;
  }

  /**
   * Return the width of the item right from the max of its start and end date
   * @return {number}
   */
  getWidthRight() {
    return 0;
  }

  /**
   * Return the title of the item
   * @return {string | undefined}
   */
  getTitle() {
    if (this.options.tooltip && this.options.tooltip.template) {
      var _context7;
      const templateFunction = _bindInstanceProperty(_context7 = this.options.tooltip.template).call(_context7, this);
      return templateFunction(this._getItemData(), this.data);
    }
    return this.data.title;
  }
}
Item.prototype.stack = true;

/**
 * @constructor BoxItem
 * @extends Item
 */
class BoxItem extends Item {
  /**
   * @param {Object} data             Object containing parameters start
   *                                  content, className.
   * @param {{toScreen: function, toTime: function}} conversion
   *                                  Conversion functions from time to screen and vice versa
   * @param {Object} [options]        Configuration options
   *                                  // TODO: describe available options
   */
  constructor(data, conversion, options) {
    super(data, conversion, options);
    this.props = {
      dot: {
        width: 0,
        height: 0
      },
      line: {
        width: 0,
        height: 0
      }
    };
    // validate data
    if (data) {
      if (data.start == undefined) {
        throw new Error("Property \"start\" missing in item ".concat(data));
      }
    }
  }

  /**
   * Check whether this item is visible inside given range
   * @param {{start: number, end: number}} range with a timestamp for start and end
   * @returns {boolean} True if visible
   */
  isVisible(range) {
    if (this.cluster) {
      return false;
    }
    // determine visibility
    let isVisible;
    const align = this.data.align || this.options.align;
    const widthInMs = this.width * range.getMillisecondsPerPixel();
    if (align == "right") {
      isVisible = this.data.start.getTime() > range.start && this.data.start.getTime() - widthInMs < range.end;
    } else if (align == "left") {
      isVisible = this.data.start.getTime() + widthInMs > range.start && this.data.start.getTime() < range.end;
    } else {
      // default or 'center'
      isVisible = this.data.start.getTime() + widthInMs / 2 > range.start && this.data.start.getTime() - widthInMs / 2 < range.end;
    }
    return isVisible;
  }

  /**
   * create DOM element
   * @private
   */
  _createDomElement() {
    if (!this.dom) {
      // create DOM
      this.dom = {};

      // create main box
      this.dom.box = document.createElement("DIV");

      // contents box (inside the background box). used for making margins
      this.dom.content = document.createElement("DIV");
      this.dom.content.className = "vis-item-content";
      this.dom.box.appendChild(this.dom.content);

      // line to axis
      this.dom.line = document.createElement("DIV");
      this.dom.line.className = "vis-line";

      // dot on axis
      this.dom.dot = document.createElement("DIV");
      this.dom.dot.className = "vis-dot";

      // attach this item as attribute
      this.dom.box["vis-item"] = this;
      this.dirty = true;
    }
  }

  /**
   * append DOM element
   * @private
   */
  _appendDomElement() {
    if (!this.parent) {
      throw new Error("Cannot redraw item: no parent attached");
    }
    if (!this.dom.box.parentNode) {
      const foreground = this.parent.dom.foreground;
      if (!foreground) throw new Error("Cannot redraw item: parent has no foreground container element");
      foreground.appendChild(this.dom.box);
    }
    if (!this.dom.line.parentNode) {
      var background = this.parent.dom.background;
      if (!background) throw new Error("Cannot redraw item: parent has no background container element");
      background.appendChild(this.dom.line);
    }
    if (!this.dom.dot.parentNode) {
      const axis = this.parent.dom.axis;
      if (!background) throw new Error("Cannot redraw item: parent has no axis container element");
      axis.appendChild(this.dom.dot);
    }
    this.displayed = true;
  }

  /**
   * update dirty DOM element
   * @private
   */
  _updateDirtyDomComponents() {
    // An item is marked dirty when:
    // - the item is not yet rendered
    // - the item's data is changed
    // - the item is selected/deselected
    if (this.dirty) {
      this._updateContents(this.dom.content);
      this._updateDataAttributes(this.dom.box);
      this._updateStyle(this.dom.box);
      const editable = this.editable.updateTime || this.editable.updateGroup;

      // update class
      const className = (this.data.className ? " " + this.data.className : "") + (this.selected ? " vis-selected" : "") + (editable ? " vis-editable" : " vis-readonly");
      this.dom.box.className = "vis-item vis-box".concat(className);
      this.dom.line.className = "vis-item vis-line".concat(className);
      this.dom.dot.className = "vis-item vis-dot".concat(className);
    }
  }

  /**
   * get DOM components sizes
   * @return {object}
   * @private
   */
  _getDomComponentsSizes() {
    return {
      previous: {
        right: this.dom.box.style.right,
        left: this.dom.box.style.left
      },
      dot: {
        height: this.dom.dot.offsetHeight,
        width: this.dom.dot.offsetWidth
      },
      line: {
        width: this.dom.line.offsetWidth
      },
      box: {
        width: this.dom.box.offsetWidth,
        height: this.dom.box.offsetHeight
      }
    };
  }

  /**
   * update DOM components sizes
   * @param {object} sizes
   * @private
   */
  _updateDomComponentsSizes(sizes) {
    if (this.options.rtl) {
      this.dom.box.style.right = "0px";
    } else {
      this.dom.box.style.left = "0px";
    }

    // recalculate size
    this.props.dot.height = sizes.dot.height;
    this.props.dot.width = sizes.dot.width;
    this.props.line.width = sizes.line.width;
    this.width = sizes.box.width;
    this.height = sizes.box.height;

    // restore previous position
    if (this.options.rtl) {
      this.dom.box.style.right = sizes.previous.right;
    } else {
      this.dom.box.style.left = sizes.previous.left;
    }
    this.dirty = false;
  }

  /**
   * repaint DOM additionals
   * @private
   */
  _repaintDomAdditionals() {
    this._repaintOnItemUpdateTimeTooltip(this.dom.box);
    this._repaintDragCenter();
    this._repaintDeleteButton(this.dom.box);
  }

  /**
   * Repaint the item
   * @param {boolean} [returnQueue=false]  return the queue
   * @return {boolean} the redraw queue if returnQueue=true
   */
  redraw(returnQueue) {
    var _context, _context2, _context3, _context5;
    let sizes;
    const queue = [
    // create item DOM
    _bindInstanceProperty(_context = this._createDomElement).call(_context, this),
    // append DOM to parent DOM
    _bindInstanceProperty(_context2 = this._appendDomElement).call(_context2, this),
    // update dirty DOM
    _bindInstanceProperty(_context3 = this._updateDirtyDomComponents).call(_context3, this), () => {
      if (this.dirty) {
        sizes = this._getDomComponentsSizes();
      }
    }, () => {
      if (this.dirty) {
        var _context4;
        _bindInstanceProperty(_context4 = this._updateDomComponentsSizes).call(_context4, this)(sizes);
      }
    },
    // repaint DOM additionals
    _bindInstanceProperty(_context5 = this._repaintDomAdditionals).call(_context5, this)];
    if (returnQueue) {
      return queue;
    } else {
      let result;
      _forEachInstanceProperty(queue).call(queue, fn => {
        result = fn();
      });
      return result;
    }
  }

  /**
   * Show the item in the DOM (when not already visible). The items DOM will
   * be created when needed.
   * @param {boolean} [returnQueue=false]  whether to return a queue of functions to execute instead of just executing them
   * @return {boolean} the redraw queue if returnQueue=true
   */
  show(returnQueue) {
    if (!this.displayed) {
      return this.redraw(returnQueue);
    }
  }

  /**
   * Hide the item from the DOM (when visible)
   */
  hide() {
    if (this.displayed) {
      const dom = this.dom;
      if (dom.box.remove) dom.box.remove();else if (dom.box.parentNode) dom.box.parentNode.removeChild(dom.box); // IE11

      if (dom.line.remove) dom.line.remove();else if (dom.line.parentNode) dom.line.parentNode.removeChild(dom.line); // IE11

      if (dom.dot.remove) dom.dot.remove();else if (dom.dot.parentNode) dom.dot.parentNode.removeChild(dom.dot); // IE11

      this.displayed = false;
    }
  }

  /**
   * Reposition the item XY
   */
  repositionXY() {
    const rtl = this.options.rtl;
    const repositionXY = function (element, x, y) {
      var _context6;
      let rtl = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : false;
      if (x === undefined && y === undefined) return;
      // If rtl invert the number.
      const directionX = rtl ? x * -1 : x;

      //no y. translate x
      if (y === undefined) {
        element.style.transform = "translateX(".concat(directionX, "px)");
        return;
      }

      //no x. translate y
      if (x === undefined) {
        element.style.transform = "translateY(".concat(y, "px)");
        return;
      }
      element.style.transform = _concatInstanceProperty(_context6 = "translate(".concat(directionX, "px, ")).call(_context6, y, "px)");
    };
    repositionXY(this.dom.box, this.boxX, this.boxY, rtl);
    repositionXY(this.dom.dot, this.dotX, this.dotY, rtl);
    repositionXY(this.dom.line, this.lineX, this.lineY, rtl);
  }

  /**
   * Reposition the item horizontally
   * @Override
   */
  repositionX() {
    const start = this.conversion.toScreen(this.data.start);
    const align = this.data.align === undefined ? this.options.align : this.data.align;
    const lineWidth = this.props.line.width;
    const dotWidth = this.props.dot.width;
    if (align == "right") {
      // calculate right position of the box
      this.boxX = start - this.width;
      this.lineX = start - lineWidth;
      this.dotX = start - lineWidth / 2 - dotWidth / 2;
    } else if (align == "left") {
      // calculate left position of the box
      this.boxX = start;
      this.lineX = start;
      this.dotX = start + lineWidth / 2 - dotWidth / 2;
    } else {
      // default or 'center'
      this.boxX = start - this.width / 2;
      this.lineX = this.options.rtl ? start - lineWidth : start - lineWidth / 2;
      this.dotX = start - dotWidth / 2;
    }
    if (this.options.rtl) this.right = this.boxX;else this.left = this.boxX;
    this.repositionXY();
  }

  /**
   * Reposition the item vertically
   * @Override
   */
  repositionY() {
    const orientation = this.options.orientation.item;
    const lineStyle = this.dom.line.style;
    if (orientation == "top") {
      const lineHeight = this.parent.top + this.top + 1;
      this.boxY = this.top || 0;
      lineStyle.height = "".concat(lineHeight, "px");
      lineStyle.bottom = "";
      lineStyle.top = "0";
    } else {
      // orientation 'bottom'
      const itemSetHeight = this.parent.itemSet.props.height; // TODO: this is nasty
      const lineHeight = itemSetHeight - this.parent.top - this.parent.height + this.top;
      this.boxY = this.parent.height - this.top - (this.height || 0);
      lineStyle.height = "".concat(lineHeight, "px");
      lineStyle.top = "";
      lineStyle.bottom = "0";
    }
    this.dotY = -this.props.dot.height / 2;
    this.repositionXY();
  }

  /**
   * Return the width of the item left from its start date
   * @return {number}
   */
  getWidthLeft() {
    return this.width / 2;
  }

  /**
   * Return the width of the item right from its start date
   * @return {number}
   */
  getWidthRight() {
    return this.width / 2;
  }
}

/**
 * @constructor PointItem
 * @extends Item
 */
class PointItem extends Item {
  /**
   * @param {Object} data             Object containing parameters start
   *                                  content, className.
   * @param {{toScreen: function, toTime: function}} conversion
   *                                  Conversion functions from time to screen and vice versa
   * @param {Object} [options]        Configuration options
   *                                  // TODO: describe available options
   */
  constructor(data, conversion, options) {
    super(data, conversion, options);
    this.props = {
      dot: {
        top: 0,
        width: 0,
        height: 0
      },
      content: {
        height: 0,
        marginLeft: 0,
        marginRight: 0
      }
    };
    // validate data
    if (data) {
      if (data.start == undefined) {
        throw new Error("Property \"start\" missing in item ".concat(data));
      }
    }
  }

  /**
   * Check whether this item is visible inside given range
   * @param {{start: number, end: number}} range with a timestamp for start and end
   * @returns {boolean} True if visible
   */
  isVisible(range) {
    if (this.cluster) {
      return false;
    }
    // determine visibility
    const widthInMs = this.width * range.getMillisecondsPerPixel();
    return this.data.start.getTime() + widthInMs > range.start && this.data.start < range.end;
  }

  /**
   * create DOM element
   * @private
   */
  _createDomElement() {
    if (!this.dom) {
      // create DOM
      this.dom = {};

      // background box
      this.dom.point = document.createElement("div");
      // className is updated in redraw()

      // contents box, right from the dot
      this.dom.content = document.createElement("div");
      this.dom.content.className = "vis-item-content";
      this.dom.point.appendChild(this.dom.content);

      // dot at start
      this.dom.dot = document.createElement("div");
      this.dom.point.appendChild(this.dom.dot);

      // attach this item as attribute
      this.dom.point["vis-item"] = this;
      this.dirty = true;
    }
  }

  /**
   * append DOM element
   * @private
   */
  _appendDomElement() {
    if (!this.parent) {
      throw new Error("Cannot redraw item: no parent attached");
    }
    if (!this.dom.point.parentNode) {
      const foreground = this.parent.dom.foreground;
      if (!foreground) {
        throw new Error("Cannot redraw item: parent has no foreground container element");
      }
      foreground.appendChild(this.dom.point);
    }
    this.displayed = true;
  }

  /**
   * update dirty DOM components
   * @private
   */
  _updateDirtyDomComponents() {
    // An item is marked dirty when:
    // - the item is not yet rendered
    // - the item's data is changed
    // - the item is selected/deselected
    if (this.dirty) {
      this._updateContents(this.dom.content);
      this._updateDataAttributes(this.dom.point);
      this._updateStyle(this.dom.point);
      const editable = this.editable.updateTime || this.editable.updateGroup;
      // update class
      const className = (this.data.className ? " " + this.data.className : "") + (this.selected ? " vis-selected" : "") + (editable ? " vis-editable" : " vis-readonly");
      this.dom.point.className = "vis-item vis-point".concat(className);
      this.dom.dot.className = "vis-item vis-dot".concat(className);
    }
  }

  /**
   * get DOM component sizes
   * @return {object}
   * @private
   */
  _getDomComponentsSizes() {
    return {
      dot: {
        width: this.dom.dot.offsetWidth,
        height: this.dom.dot.offsetHeight
      },
      content: {
        width: this.dom.content.offsetWidth,
        height: this.dom.content.offsetHeight
      },
      point: {
        width: this.dom.point.offsetWidth,
        height: this.dom.point.offsetHeight
      }
    };
  }

  /**
   * update DOM components sizes
   * @param {array} sizes
   * @private
   */
  _updateDomComponentsSizes(sizes) {
    // recalculate size of dot and contents
    this.props.dot.width = sizes.dot.width;
    this.props.dot.height = sizes.dot.height;
    this.props.content.height = sizes.content.height;

    // resize contents
    if (this.options.rtl) {
      this.dom.content.style.marginRight = "".concat(this.props.dot.width / 2, "px");
    } else {
      this.dom.content.style.marginLeft = "".concat(this.props.dot.width / 2, "px");
    }
    //this.dom.content.style.marginRight = ... + 'px'; // TODO: margin right

    // recalculate size
    this.width = sizes.point.width;
    this.height = sizes.point.height;

    // reposition the dot
    this.dom.dot.style.top = "".concat((this.height - this.props.dot.height) / 2, "px");
    const dotWidth = this.props.dot.width;
    const translateX = this.options.rtl ? dotWidth / 2 : dotWidth / 2 * -1;
    this.dom.dot.style.transform = "translateX(".concat(translateX, "px");
    this.dirty = false;
  }

  /**
   * Repain DOM additionals
   * @private
   */
  _repaintDomAdditionals() {
    this._repaintOnItemUpdateTimeTooltip(this.dom.point);
    this._repaintDragCenter();
    this._repaintDeleteButton(this.dom.point);
  }

  /**
   * Repaint the item
   * @param {boolean} [returnQueue=false]  return the queue
   * @return {boolean} the redraw queue if returnQueue=true
   */
  redraw(returnQueue) {
    var _context, _context2, _context3, _context5;
    let sizes;
    const queue = [
    // create item DOM
    _bindInstanceProperty(_context = this._createDomElement).call(_context, this),
    // append DOM to parent DOM
    _bindInstanceProperty(_context2 = this._appendDomElement).call(_context2, this),
    // update dirty DOM
    _bindInstanceProperty(_context3 = this._updateDirtyDomComponents).call(_context3, this), () => {
      if (this.dirty) {
        sizes = this._getDomComponentsSizes();
      }
    }, () => {
      if (this.dirty) {
        var _context4;
        _bindInstanceProperty(_context4 = this._updateDomComponentsSizes).call(_context4, this)(sizes);
      }
    },
    // repaint DOM additionals
    _bindInstanceProperty(_context5 = this._repaintDomAdditionals).call(_context5, this)];
    if (returnQueue) {
      return queue;
    } else {
      let result;
      _forEachInstanceProperty(queue).call(queue, fn => {
        result = fn();
      });
      return result;
    }
  }

  /**
   * Reposition XY
   */
  repositionXY() {
    const rtl = this.options.rtl;
    const repositionXY = function (element, x, y) {
      var _context6;
      let rtl = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : false;
      if (x === undefined && y === undefined) return;
      // If rtl invert the number.
      const directionX = rtl ? x * -1 : x;

      //no y. translate x
      if (y === undefined) {
        element.style.transform = "translateX(".concat(directionX, "px)");
        return;
      }

      //no x. translate y
      if (x === undefined) {
        element.style.transform = "translateY(".concat(y, "px)");
        return;
      }
      element.style.transform = _concatInstanceProperty(_context6 = "translate(".concat(directionX, "px, ")).call(_context6, y, "px)");
    };
    repositionXY(this.dom.point, this.pointX, this.pointY, rtl);
  }

  /**
   * Show the item in the DOM (when not already visible). The items DOM will
   * be created when needed.
   * @param {boolean} [returnQueue=false]  whether to return a queue of functions to execute instead of just executing them
   * @return {boolean} the redraw queue if returnQueue=true
   */
  show(returnQueue) {
    if (!this.displayed) {
      return this.redraw(returnQueue);
    }
  }

  /**
   * Hide the item from the DOM (when visible)
   */
  hide() {
    if (this.displayed) {
      if (this.dom.point.parentNode) {
        this.dom.point.parentNode.removeChild(this.dom.point);
      }
      this.displayed = false;
    }
  }

  /**
   * Reposition the item horizontally
   * @Override
   */
  repositionX() {
    const start = this.conversion.toScreen(this.data.start);
    this.pointX = start;
    if (this.options.rtl) {
      this.right = start - this.props.dot.width;
    } else {
      this.left = start - this.props.dot.width;
    }
    this.repositionXY();
  }

  /**
   * Reposition the item vertically
   * @Override
   */
  repositionY() {
    const orientation = this.options.orientation.item;
    if (orientation == "top") {
      this.pointY = this.top;
    } else {
      this.pointY = this.parent.height - this.top - this.height;
    }
    this.repositionXY();
  }

  /**
   * Return the width of the item left from its start date
   * @return {number}
   */
  getWidthLeft() {
    return this.props.dot.width;
  }

  /**
   * Return the width of the item right from  its start date
   * @return {number}
   */
  getWidthRight() {
    return this.props.dot.width;
  }
}

/**
 * @constructor RangeItem
 * @extends Item
 */
class RangeItem extends Item {
  /**
   * @param {Object} data             Object containing parameters start, end
   *                                  content, className.
   * @param {{toScreen: function, toTime: function}} conversion
   *                                  Conversion functions from time to screen and vice versa
   * @param {Object} [options]        Configuration options
   *                                  // TODO: describe options
   */
  constructor(data, conversion, options) {
    super(data, conversion, options);
    this.props = {
      content: {
        width: 0
      }
    };
    this.overflow = false; // if contents can overflow (css styling), this flag is set to true
    // validate data
    if (data) {
      if (data.start == undefined) {
        throw new Error("Property \"start\" missing in item ".concat(data.id));
      }
      if (data.end == undefined) {
        throw new Error("Property \"end\" missing in item ".concat(data.id));
      }
    }
  }

  /**
   * Check whether this item is visible inside given range
   *
   * @param {timeline.Range} range with a timestamp for start and end
   * @returns {boolean} True if visible
   */
  isVisible(range) {
    if (this.cluster) {
      return false;
    }
    // determine visibility
    return this.data.start < range.end && this.data.end > range.start;
  }

  /**
   * create DOM elements
   * @private
   */
  _createDomElement() {
    if (!this.dom) {
      // create DOM
      this.dom = {};

      // background box
      this.dom.box = document.createElement("div");
      // className is updated in redraw()

      // frame box (to prevent the item contents from overflowing)
      this.dom.frame = document.createElement("div");
      this.dom.frame.className = "vis-item-overflow";
      this.dom.box.appendChild(this.dom.frame);

      // visible frame box (showing the frame that is always visible)
      this.dom.visibleFrame = document.createElement("div");
      this.dom.visibleFrame.className = "vis-item-visible-frame";
      this.dom.box.appendChild(this.dom.visibleFrame);

      // contents box
      this.dom.content = document.createElement("div");
      this.dom.content.className = "vis-item-content";
      this.dom.frame.appendChild(this.dom.content);

      // attach this item as attribute
      this.dom.box["vis-item"] = this;
      this.dirty = true;
    }
  }

  /**
   * append element to DOM
   * @private
   */
  _appendDomElement() {
    if (!this.parent) {
      throw new Error("Cannot redraw item: no parent attached");
    }
    if (!this.dom.box.parentNode) {
      const foreground = this.parent.dom.foreground;
      if (!foreground) {
        throw new Error("Cannot redraw item: parent has no foreground container element");
      }
      foreground.appendChild(this.dom.box);
    }
    this.displayed = true;
  }

  /**
   * update dirty DOM components
   * @private
   */
  _updateDirtyDomComponents() {
    // update dirty DOM. An item is marked dirty when:
    // - the item is not yet rendered
    // - the item's data is changed
    // - the item is selected/deselected
    if (this.dirty) {
      this._updateContents(this.dom.content);
      this._updateDataAttributes(this.dom.box);
      this._updateStyle(this.dom.box);
      const editable = this.editable.updateTime || this.editable.updateGroup;

      // update class
      const className = (this.data.className ? " " + this.data.className : "") + (this.selected ? " vis-selected" : "") + (editable ? " vis-editable" : " vis-readonly");
      this.dom.box.className = this.baseClassName + className;

      // turn off max-width to be able to calculate the real width
      // this causes an extra browser repaint/reflow, but so be it
      this.dom.content.style.maxWidth = "none";
    }
  }

  /**
   * get DOM component sizes
   * @return {object}
   * @private
   */
  _getDomComponentsSizes() {
    // determine from css whether this box has overflow
    this.overflow = window.getComputedStyle(this.dom.frame).overflow !== "hidden";
    this.whiteSpace = window.getComputedStyle(this.dom.content).whiteSpace !== "nowrap";
    return {
      content: {
        width: this.dom.content.offsetWidth
      },
      box: {
        height: this.dom.box.offsetHeight
      }
    };
  }

  /**
   * update DOM component sizes
   * @param {array} sizes
   * @private
   */
  _updateDomComponentsSizes(sizes) {
    this.props.content.width = sizes.content.width;
    this.height = sizes.box.height;
    this.dom.content.style.maxWidth = "";
    this.dirty = false;
  }

  /**
   * repaint DOM additional components
   * @private
   */
  _repaintDomAdditionals() {
    this._repaintOnItemUpdateTimeTooltip(this.dom.box);
    this._repaintDeleteButton(this.dom.box);
    this._repaintDragCenter();
    this._repaintDragLeft();
    this._repaintDragRight();
  }

  /**
   * Repaint the item
   * @param {boolean} [returnQueue=false]  return the queue
   * @return {boolean} the redraw queue if returnQueue=true
   */
  redraw(returnQueue) {
    var _context, _context2, _context3, _context6;
    let sizes;
    const queue = [
    // create item DOM
    _bindInstanceProperty(_context = this._createDomElement).call(_context, this),
    // append DOM to parent DOM
    _bindInstanceProperty(_context2 = this._appendDomElement).call(_context2, this),
    // update dirty DOM
    _bindInstanceProperty(_context3 = this._updateDirtyDomComponents).call(_context3, this), () => {
      if (this.dirty) {
        var _context4;
        sizes = _bindInstanceProperty(_context4 = this._getDomComponentsSizes).call(_context4, this)();
      }
    }, () => {
      if (this.dirty) {
        var _context5;
        _bindInstanceProperty(_context5 = this._updateDomComponentsSizes).call(_context5, this)(sizes);
      }
    },
    // repaint DOM additionals
    _bindInstanceProperty(_context6 = this._repaintDomAdditionals).call(_context6, this)];
    if (returnQueue) {
      return queue;
    } else {
      let result;
      _forEachInstanceProperty(queue).call(queue, fn => {
        result = fn();
      });
      return result;
    }
  }

  /**
   * Show the item in the DOM (when not already visible). The items DOM will
   * be created when needed.
   * @param {boolean} [returnQueue=false]  whether to return a queue of functions to execute instead of just executing them
   * @return {boolean} the redraw queue if returnQueue=true
   */
  show(returnQueue) {
    if (!this.displayed) {
      return this.redraw(returnQueue);
    }
  }

  /**
   * Hide the item from the DOM (when visible)
   */
  hide() {
    if (this.displayed) {
      const box = this.dom.box;
      if (box.parentNode) {
        box.parentNode.removeChild(box);
      }
      this.displayed = false;
    }
  }

  /**
   * Reposition the item horizontally
   * @param {boolean} [limitSize=true] If true (default), the width of the range
   *                                   item will be limited, as the browser cannot
   *                                   display very wide divs. This means though
   *                                   that the applied left and width may
   *                                   not correspond to the ranges start and end
   * @Override
   */
  repositionX(limitSize) {
    const parentWidth = this.parent.width;
    let start = this.conversion.toScreen(this.data.start);
    let end = this.conversion.toScreen(this.data.end);
    const align = this.data.align === undefined ? this.options.align : this.data.align;
    let contentStartPosition;
    let contentWidth;

    // limit the width of the range, as browsers cannot draw very wide divs
    // unless limitSize: false is explicitly set in item data
    if (this.data.limitSize !== false && (limitSize === undefined || limitSize === true)) {
      if (start < -parentWidth) {
        start = -parentWidth;
      }
      if (end > 2 * parentWidth) {
        end = 2 * parentWidth;
      }
    }

    //round to 3 decimals to compensate floating-point values rounding
    const boxWidth = Math.max(Math.round((end - start) * 1000) / 1000, 1);
    if (this.overflow) {
      if (this.options.rtl) {
        this.right = start;
      } else {
        this.left = start;
      }
      this.width = boxWidth + this.props.content.width;
      contentWidth = this.props.content.width;

      // Note: The calculation of width is an optimistic calculation, giving
      //       a width which will not change when moving the Timeline
      //       So no re-stacking needed, which is nicer for the eye;
    } else {
      if (this.options.rtl) {
        this.right = start;
      } else {
        this.left = start;
      }
      this.width = boxWidth;
      contentWidth = Math.min(end - start, this.props.content.width);
    }
    if (this.options.rtl) {
      this.dom.box.style.transform = "translateX(".concat(this.right * -1, "px)");
    } else {
      this.dom.box.style.transform = "translateX(".concat(this.left, "px)");
    }
    this.dom.box.style.width = "".concat(boxWidth, "px");
    if (this.whiteSpace) {
      this.height = this.dom.box.offsetHeight;
    }
    switch (align) {
      case "left":
        this.dom.content.style.transform = "translateX(0)";
        break;
      case "right":
        if (this.options.rtl) {
          const translateX = Math.max(boxWidth - contentWidth, 0) * -1;
          this.dom.content.style.transform = "translateX(".concat(translateX, "px)");
        } else {
          this.dom.content.style.transform = "translateX(".concat(Math.max(boxWidth - contentWidth, 0), "px)");
        }
        break;
      case "center":
        if (this.options.rtl) {
          const translateX = Math.max((boxWidth - contentWidth) / 2, 0) * -1;
          this.dom.content.style.transform = "translateX(".concat(translateX, "px)");
        } else {
          this.dom.content.style.transform = "translateX(".concat(Math.max((boxWidth - contentWidth) / 2, 0), "px)");
        }
        break;
      default:
        // 'auto'
        // when range exceeds left of the window, position the contents at the left of the visible area
        if (this.overflow) {
          if (end > 0) {
            contentStartPosition = Math.max(-start, 0);
          } else {
            contentStartPosition = -contentWidth; // ensure it's not visible anymore
          }
        } else {
          if (start < 0) {
            contentStartPosition = -start;
          } else {
            contentStartPosition = 0;
          }
        }
        if (this.options.rtl) {
          const translateX = contentStartPosition * -1;
          this.dom.content.style.transform = "translateX(".concat(translateX, "px)");
        } else {
          this.dom.content.style.transform = "translateX(".concat(contentStartPosition, "px)");
          // this.dom.content.style.width = `calc(100% - ${contentStartPosition}px)`;
        }
    }
  }

  /**
   * Reposition the item vertically
   * @Override
   */
  repositionY() {
    const orientation = this.options.orientation.item;
    const box = this.dom.box;
    if (orientation == "top") {
      box.style.top = "".concat(this.top, "px");
    } else {
      box.style.top = "".concat(this.parent.height - this.top - this.height, "px");
    }
  }

  /**
   * Repaint a drag area on the left side of the range when the range is selected
   * @protected
   */
  _repaintDragLeft() {
    if ((this.selected || this.options.itemsAlwaysDraggable.range) && this.editable.updateTime && !this.dom.dragLeft) {
      // create and show drag area
      const dragLeft = document.createElement("div");
      dragLeft.className = "vis-drag-left";
      dragLeft.dragLeftItem = this;
      this.dom.box.appendChild(dragLeft);
      this.dom.dragLeft = dragLeft;
    } else if (!this.selected && !this.options.itemsAlwaysDraggable.range && this.dom.dragLeft) {
      // delete drag area
      if (this.dom.dragLeft.parentNode) {
        this.dom.dragLeft.parentNode.removeChild(this.dom.dragLeft);
      }
      this.dom.dragLeft = null;
    }
  }

  /**
   * Repaint a drag area on the right side of the range when the range is selected
   * @protected
   */
  _repaintDragRight() {
    if ((this.selected || this.options.itemsAlwaysDraggable.range) && this.editable.updateTime && !this.dom.dragRight) {
      // create and show drag area
      const dragRight = document.createElement("div");
      dragRight.className = "vis-drag-right";
      dragRight.dragRightItem = this;
      this.dom.box.appendChild(dragRight);
      this.dom.dragRight = dragRight;
    } else if (!this.selected && !this.options.itemsAlwaysDraggable.range && this.dom.dragRight) {
      // delete drag area
      if (this.dom.dragRight.parentNode) {
        this.dom.dragRight.parentNode.removeChild(this.dom.dragRight);
      }
      this.dom.dragRight = null;
    }
  }
}
RangeItem.prototype.baseClassName = "vis-item vis-range";

/**
 * @constructor BackgroundItem
 * @extends Item
 */
class BackgroundItem extends Item {
  /**
   * @constructor BackgroundItem
   * @param {Object} data             Object containing parameters start, end
   *                                  content, className.
   * @param {{toScreen: function, toTime: function}} conversion
   *                                  Conversion functions from time to screen and vice versa
   * @param {Object} [options]        Configuration options
   *                                  // TODO: describe options
   * // TODO: implement support for the BackgroundItem just having a start, then being displayed as a sort of an annotation
   */
  constructor(data, conversion, options) {
    super(data, conversion, options);
    this.props = {
      content: {
        width: 0
      }
    };
    this.overflow = false; // if contents can overflow (css styling), this flag is set to true

    // validate data
    if (data) {
      if (data.start == undefined) {
        throw new Error("Property \"start\" missing in item ".concat(data.id));
      }
      if (data.end == undefined) {
        throw new Error("Property \"end\" missing in item ".concat(data.id));
      }
    }
  }

  /**
   * Check whether this item is visible inside given range
   * @param {timeline.Range} range with a timestamp for start and end
   * @returns {boolean} True if visible
   */
  isVisible(range) {
    // determine visibility
    return this.data.start < range.end && this.data.end > range.start;
  }

  /**
   * create DOM element
   * @private
   */
  _createDomElement() {
    if (!this.dom) {
      // create DOM
      this.dom = {};

      // background box
      this.dom.box = document.createElement("div");
      // className is updated in redraw()

      // frame box (to prevent the item contents from overflowing
      this.dom.frame = document.createElement("div");
      this.dom.frame.className = "vis-item-overflow";
      this.dom.box.appendChild(this.dom.frame);

      // contents box
      this.dom.content = document.createElement("div");
      this.dom.content.className = "vis-item-content";
      this.dom.frame.appendChild(this.dom.content);

      // Note: we do NOT attach this item as attribute to the DOM,
      //       such that background items cannot be selected
      //this.dom.box['vis-item'] = this;

      this.dirty = true;
    }
  }

  /**
   * append DOM element
   * @private
   */
  _appendDomElement() {
    if (!this.parent) {
      throw new Error("Cannot redraw item: no parent attached");
    }
    if (!this.dom.box.parentNode) {
      const background = this.parent.dom.background;
      if (!background) {
        throw new Error("Cannot redraw item: parent has no background container element");
      }
      background.appendChild(this.dom.box);
    }
    this.displayed = true;
  }

  /**
   * update DOM Dirty components
   * @private
   */
  _updateDirtyDomComponents() {
    // update dirty DOM. An item is marked dirty when:
    // - the item is not yet rendered
    // - the item's data is changed
    // - the item is selected/deselected
    if (this.dirty) {
      this._updateContents(this.dom.content);
      this._updateDataAttributes(this.dom.content);
      this._updateStyle(this.dom.box);

      // update class
      const className = (this.data.className ? " " + this.data.className : "") + (this.selected ? " vis-selected" : "");
      this.dom.box.className = this.baseClassName + className;
    }
  }

  /**
   * get DOM components sizes
   * @return {object}
   * @private
   */
  _getDomComponentsSizes() {
    // determine from css whether this box has overflow
    this.overflow = window.getComputedStyle(this.dom.content).overflow !== "hidden";
    return {
      content: {
        width: this.dom.content.offsetWidth
      }
    };
  }

  /**
   * update DOM components sizes
   * @param {object} sizes
   * @private
   */
  _updateDomComponentsSizes(sizes) {
    // recalculate size
    this.props.content.width = sizes.content.width;
    this.height = 0; // set height zero, so this item will be ignored when stacking items

    this.dirty = false;
  }

  /**
   * repaint DOM additionals
   * @private
   */
  _repaintDomAdditionals() {}

  /**
   * Repaint the item
   * @param {boolean} [returnQueue=false]  return the queue
   * @return {boolean} the redraw result or the redraw queue if returnQueue=true
   */
  redraw(returnQueue) {
    var _context, _context2, _context3, _context6;
    let sizes;
    const queue = [
    // create item DOM
    _bindInstanceProperty(_context = this._createDomElement).call(_context, this),
    // append DOM to parent DOM
    _bindInstanceProperty(_context2 = this._appendDomElement).call(_context2, this), _bindInstanceProperty(_context3 = this._updateDirtyDomComponents).call(_context3, this), () => {
      if (this.dirty) {
        var _context4;
        sizes = _bindInstanceProperty(_context4 = this._getDomComponentsSizes).call(_context4, this)();
      }
    }, () => {
      if (this.dirty) {
        var _context5;
        _bindInstanceProperty(_context5 = this._updateDomComponentsSizes).call(_context5, this)(sizes);
      }
    },
    // repaint DOM additionals
    _bindInstanceProperty(_context6 = this._repaintDomAdditionals).call(_context6, this)];
    if (returnQueue) {
      return queue;
    } else {
      let result;
      _forEachInstanceProperty(queue).call(queue, fn => {
        result = fn();
      });
      return result;
    }
  }

  /**
   * Reposition the item vertically
   * @Override
   */
  repositionY() {
    let height;
    const orientation = this.options.orientation.item;

    // special positioning for subgroups
    if (this.data.subgroup !== undefined) {
      // TODO: instead of calculating the top position of the subgroups here for every BackgroundItem, calculate the top of the subgroup once in Itemset
      const itemSubgroup = this.data.subgroup;
      this.dom.box.style.height = "".concat(this.parent.subgroups[itemSubgroup].height, "px");
      if (orientation == "top") {
        this.dom.box.style.top = "".concat(this.parent.top + this.parent.subgroups[itemSubgroup].top, "px");
      } else {
        this.dom.box.style.top = "".concat(this.parent.top + this.parent.height - this.parent.subgroups[itemSubgroup].top - this.parent.subgroups[itemSubgroup].height, "px");
      }
      this.dom.box.style.bottom = "";
    }
    // and in the case of no subgroups:
    else {
      // we want backgrounds with groups to only show in groups.
      if (this.parent instanceof BackgroundGroup) {
        // if the item is not in a group:
        height = Math.max(this.parent.height, this.parent.itemSet.body.domProps.center.height, this.parent.itemSet.body.domProps.centerContainer.height);
        this.dom.box.style.bottom = orientation == "bottom" ? "0" : "";
        this.dom.box.style.top = orientation == "top" ? "0" : "";
      } else {
        height = this.parent.height;
        // same alignment for items when orientation is top or bottom
        this.dom.box.style.top = "".concat(this.parent.top, "px");
        this.dom.box.style.bottom = "";
      }
    }
    this.dom.box.style.height = "".concat(height, "px");
  }
}
BackgroundItem.prototype.baseClassName = "vis-item vis-background";
BackgroundItem.prototype.stack = false;

/**
 * Show the item in the DOM (when not already visible). The items DOM will
 * be created when needed.
 */
BackgroundItem.prototype.show = RangeItem.prototype.show;

/**
 * Hide the item from the DOM (when visible)
 * @return {Boolean} changed
 */
BackgroundItem.prototype.hide = RangeItem.prototype.hide;

/**
 * Reposition the item horizontally
 * @Override
 */
BackgroundItem.prototype.repositionX = RangeItem.prototype.repositionX;

/**
 * Popup is a class to create a popup window with some text
 */
class Popup {
  /**
   * @param {Element} container       The container object.
   * @param {string}  overflowMethod  How the popup should act to overflowing ('flip', 'cap' or 'none')
   */
  constructor(container, overflowMethod) {
    this.container = container;
    this.overflowMethod = overflowMethod || "cap";
    this.x = 0;
    this.y = 0;
    this.padding = 5;
    this.hidden = false;

    // create the frame
    this.frame = document.createElement("div");
    this.frame.className = "vis-tooltip";
    this.container.appendChild(this.frame);
  }

  /**
   * @param {number} x   Horizontal position of the popup window
   * @param {number} y   Vertical position of the popup window
   */
  setPosition(x, y) {
    this.x = _parseInt(x);
    this.y = _parseInt(y);
  }

  /**
   * Set the content for the popup window. This can be HTML code or text.
   * @param {string | Element} content
   */
  setText(content) {
    if (content instanceof Element) {
      this.frame.innerHTML = "";
      this.frame.appendChild(content);
    } else {
      this.frame.innerHTML = availableUtils.xss(content); // string containing text or HTML
    }
  }

  /**
   * Show the popup window
   * @param {boolean} [doShow]    Show or hide the window
   */
  show(doShow) {
    if (doShow === undefined) {
      doShow = true;
    }
    if (doShow === true) {
      var height = this.frame.clientHeight;
      var width = this.frame.clientWidth;
      var maxHeight = this.frame.parentNode.clientHeight;
      var maxWidth = this.frame.parentNode.clientWidth;
      var left = 0,
        top = 0;
      if (this.overflowMethod == "flip" || this.overflowMethod == "none") {
        let isLeft = false,
          isTop = true; // Where around the position it's located

        if (this.overflowMethod == "flip") {
          if (this.y - height < this.padding) {
            isTop = false;
          }
          if (this.x + width > maxWidth - this.padding) {
            isLeft = true;
          }
        }
        if (isLeft) {
          left = this.x - width;
        } else {
          left = this.x;
        }
        if (isTop) {
          top = this.y - height;
        } else {
          top = this.y;
        }
      } else {
        // this.overflowMethod == 'cap'
        top = this.y - height;
        if (top + height + this.padding > maxHeight) {
          top = maxHeight - height - this.padding;
        }
        if (top < this.padding) {
          top = this.padding;
        }
        left = this.x;
        if (left + width + this.padding > maxWidth) {
          left = maxWidth - width - this.padding;
        }
        if (left < this.padding) {
          left = this.padding;
        }
      }
      this.frame.style.left = left + "px";
      this.frame.style.top = top + "px";
      this.frame.style.visibility = "visible";
      this.hidden = false;
    } else {
      this.hide();
    }
  }

  /**
   * Hide the popup window
   */
  hide() {
    this.hidden = true;
    this.frame.style.left = "0";
    this.frame.style.top = "0";
    this.frame.style.visibility = "hidden";
  }

  /**
   * Remove the popup window
   */
  destroy() {
    this.frame.parentNode.removeChild(this.frame); // Remove element from DOM
  }
}

var es_array_every = {};

var hasRequiredEs_array_every;

function requireEs_array_every () {
	if (hasRequiredEs_array_every) return es_array_every;
	hasRequiredEs_array_every = 1;
	var $ = /*@__PURE__*/ require_export();
	var $every = /*@__PURE__*/ requireArrayIteration().every;
	var arrayMethodIsStrict = /*@__PURE__*/ requireArrayMethodIsStrict();

	var STRICT_METHOD = arrayMethodIsStrict('every');

	// `Array.prototype.every` method
	// https://tc39.es/ecma262/#sec-array.prototype.every
	$({ target: 'Array', proto: true, forced: !STRICT_METHOD }, {
	  every: function every(callbackfn /* , thisArg */) {
	    return $every(this, callbackfn, arguments.length > 1 ? arguments[1] : undefined);
	  }
	});
	return es_array_every;
}

var every$3;
var hasRequiredEvery$3;

function requireEvery$3 () {
	if (hasRequiredEvery$3) return every$3;
	hasRequiredEvery$3 = 1;
	requireEs_array_every();
	var getBuiltInPrototypeMethod = /*@__PURE__*/ requireGetBuiltInPrototypeMethod();

	every$3 = getBuiltInPrototypeMethod('Array', 'every');
	return every$3;
}

var every$2;
var hasRequiredEvery$2;

function requireEvery$2 () {
	if (hasRequiredEvery$2) return every$2;
	hasRequiredEvery$2 = 1;
	var isPrototypeOf = /*@__PURE__*/ requireObjectIsPrototypeOf();
	var method = /*@__PURE__*/ requireEvery$3();

	var ArrayPrototype = Array.prototype;

	every$2 = function (it) {
	  var own = it.every;
	  return it === ArrayPrototype || (isPrototypeOf(ArrayPrototype, it) && own === ArrayPrototype.every) ? method : own;
	};
	return every$2;
}

var every$1;
var hasRequiredEvery$1;

function requireEvery$1 () {
	if (hasRequiredEvery$1) return every$1;
	hasRequiredEvery$1 = 1;
	var parent = /*@__PURE__*/ requireEvery$2();

	every$1 = parent;
	return every$1;
}

var every;
var hasRequiredEvery;

function requireEvery () {
	if (hasRequiredEvery) return every;
	hasRequiredEvery = 1;
	every = /*@__PURE__*/ requireEvery$1();
	return every;
}

var everyExports = requireEvery();
var _everyInstanceProperty = /*@__PURE__*/getDefaultExportFromCjs(everyExports);

/**
 * ClusterItem
 */
class ClusterItem extends Item {
  /**
   * @constructor Item
   * @param {Object} data             Object containing (optional) parameters type,
   *                                  start, end, content, group, className.
   * @param {{toScreen: function, toTime: function}} conversion
   *                                  Conversion functions from time to screen and vice versa
   * @param {Object} options          Configuration options
   *                                  // TODO: describe available options
   */
  constructor(data, conversion, options) {
    const modifiedOptions = _Object$assign({}, {
      fitOnDoubleClick: true
    }, options, {
      editable: false
    });
    super(data, conversion, modifiedOptions);
    this.props = {
      content: {
        width: 0,
        height: 0
      }
    };
    if (!data || data.uiItems == undefined) {
      throw new Error('Property "uiItems" missing in item ' + data.id);
    }
    this.id = v4();
    this.group = data.group;
    this._setupRange();
    this.emitter = this.data.eventEmitter;
    this.range = this.data.range;
    this.attached = false;
    this.isCluster = true;
    this.data.isCluster = true;
  }

  /**
   * check if there are items
   * @return {boolean}
   */
  hasItems() {
    return this.data.uiItems && this.data.uiItems.length && this.attached;
  }

  /**
   * set UI items
   * @param {array} items
   */
  setUiItems(items) {
    this.detach();
    this.data.uiItems = items;
    this._setupRange();
    this.attach();
  }

  /**
   * check is visible
   * @param {object} range
   * @return {boolean}
   */
  isVisible(range) {
    const rangeWidth = this.data.end ? this.data.end - this.data.start : 0;
    const widthInMs = this.width * range.getMillisecondsPerPixel();
    const end = Math.max(this.data.start.getTime() + rangeWidth, this.data.start.getTime() + widthInMs);
    return this.data.start < range.end && end > range.start && this.hasItems();
  }

  /**
   * get cluster data
   * @return {object}
   */
  getData() {
    return {
      isCluster: true,
      id: this.id,
      items: this.data.items || [],
      data: this.data
    };
  }

  /**
   * redraw cluster item
   * @param {boolean} returnQueue
   * @return {boolean}
   */
  redraw(returnQueue) {
    var _context, _context2, _context3, _context4, _context5, _context7;
    var sizes;
    var queue = [
    // create item DOM
    _bindInstanceProperty(_context = this._createDomElement).call(_context, this),
    // append DOM to parent DOM
    _bindInstanceProperty(_context2 = this._appendDomElement).call(_context2, this),
    // update dirty DOM
    _bindInstanceProperty(_context3 = this._updateDirtyDomComponents).call(_context3, this), _bindInstanceProperty(_context4 = function () {
      if (this.dirty) {
        sizes = this._getDomComponentsSizes();
      }
    }).call(_context4, this), _bindInstanceProperty(_context5 = function () {
      if (this.dirty) {
        var _context6;
        _bindInstanceProperty(_context6 = this._updateDomComponentsSizes).call(_context6, this)(sizes);
      }
    }).call(_context5, this),
    // repaint DOM additionals
    _bindInstanceProperty(_context7 = this._repaintDomAdditionals).call(_context7, this)];
    if (returnQueue) {
      return queue;
    } else {
      var result;
      _forEachInstanceProperty(queue).call(queue, function (fn) {
        result = fn();
      });
      return result;
    }
  }

  /**
   * show cluster item
   */
  show() {
    if (!this.displayed) {
      this.redraw();
    }
  }

  /**
   * Hide the item from the DOM (when visible)
   */
  hide() {
    if (this.displayed) {
      var dom = this.dom;
      if (dom.box.parentNode) {
        dom.box.parentNode.removeChild(dom.box);
      }
      if (this.options.showStipes) {
        if (dom.line.parentNode) {
          dom.line.parentNode.removeChild(dom.line);
        }
        if (dom.dot.parentNode) {
          dom.dot.parentNode.removeChild(dom.dot);
        }
      }
      this.displayed = false;
    }
  }

  /**
   * reposition item x axis
   */
  repositionX() {
    let start = this.conversion.toScreen(this.data.start);
    let end = this.data.end ? this.conversion.toScreen(this.data.end) : 0;
    if (end) {
      this.repositionXWithRanges(start, end);
    } else {
      let align = this.data.align === undefined ? this.options.align : this.data.align;
      this.repositionXWithoutRanges(start, align);
    }
    if (this.options.showStipes) {
      this.dom.line.style.display = this._isStipeVisible() ? "block" : "none";
      this.dom.dot.style.display = this._isStipeVisible() ? "block" : "none";
      if (this._isStipeVisible()) {
        this.repositionStype(start, end);
      }
    }
  }

  /**
   * reposition item stype
   * @param {date} start
   * @param {date} end
   */
  repositionStype(start, end) {
    this.dom.line.style.display = "block";
    this.dom.dot.style.display = "block";
    const lineOffsetWidth = this.dom.line.offsetWidth;
    const dotOffsetWidth = this.dom.dot.offsetWidth;
    if (end) {
      const lineOffset = lineOffsetWidth + start + (end - start) / 2;
      const dotOffset = lineOffset - dotOffsetWidth / 2;
      const lineOffsetDirection = this.options.rtl ? lineOffset * -1 : lineOffset;
      const dotOffsetDirection = this.options.rtl ? dotOffset * -1 : dotOffset;
      this.dom.line.style.transform = "translateX(".concat(lineOffsetDirection, "px)");
      this.dom.dot.style.transform = "translateX(".concat(dotOffsetDirection, "px)");
    } else {
      const lineOffsetDirection = this.options.rtl ? start * -1 : start;
      const dotOffsetDirection = this.options.rtl ? (start - dotOffsetWidth / 2) * -1 : start - dotOffsetWidth / 2;
      this.dom.line.style.transform = "translateX(".concat(lineOffsetDirection, "px)");
      this.dom.dot.style.transform = "translateX(".concat(dotOffsetDirection, "px)");
    }
  }

  /**
   * reposition x without ranges
   * @param {date} start
   * @param {string} align
   */
  repositionXWithoutRanges(start, align) {
    // calculate left position of the box
    if (align == "right") {
      if (this.options.rtl) {
        this.right = start - this.width;

        // reposition box, line, and dot
        this.dom.box.style.right = this.right + "px";
      } else {
        this.left = start - this.width;

        // reposition box, line, and dot
        this.dom.box.style.left = this.left + "px";
      }
    } else if (align == "left") {
      if (this.options.rtl) {
        this.right = start;

        // reposition box, line, and dot
        this.dom.box.style.right = this.right + "px";
      } else {
        this.left = start;

        // reposition box, line, and dot
        this.dom.box.style.left = this.left + "px";
      }
    } else {
      // default or 'center'
      if (this.options.rtl) {
        this.right = start - this.width / 2;

        // reposition box, line, and dot
        this.dom.box.style.right = this.right + "px";
      } else {
        this.left = start - this.width / 2;

        // reposition box, line, and dot
        this.dom.box.style.left = this.left + "px";
      }
    }
  }

  /**
   * reposition x with ranges
   * @param {date} start
   * @param {date} end
   */
  repositionXWithRanges(start, end) {
    let boxWidth = Math.round(Math.max(end - start + 0.5, 1));
    if (this.options.rtl) {
      this.right = start;
    } else {
      this.left = start;
    }
    this.width = Math.max(boxWidth, this.minWidth || 0);
    if (this.options.rtl) {
      this.dom.box.style.right = this.right + "px";
    } else {
      this.dom.box.style.left = this.left + "px";
    }
    this.dom.box.style.width = boxWidth + "px";
  }

  /**
   * reposition item y axis
   */
  repositionY() {
    var orientation = this.options.orientation.item;
    var box = this.dom.box;
    if (orientation == "top") {
      box.style.top = (this.top || 0) + "px";
    } else {
      // orientation 'bottom'
      box.style.top = (this.parent.height - this.top - this.height || 0) + "px";
    }
    if (this.options.showStipes) {
      if (orientation == "top") {
        this.dom.line.style.top = "0";
        this.dom.line.style.height = this.parent.top + this.top + 1 + "px";
        this.dom.line.style.bottom = "";
      } else {
        // orientation 'bottom'
        var itemSetHeight = this.parent.itemSet.props.height;
        var lineHeight = itemSetHeight - this.parent.top - this.parent.height + this.top;
        this.dom.line.style.top = itemSetHeight - lineHeight + "px";
        this.dom.line.style.bottom = "0";
      }
      this.dom.dot.style.top = -this.dom.dot.offsetHeight / 2 + "px";
    }
  }

  /**
   * get width left
   * @return {number}
   */
  getWidthLeft() {
    return this.width / 2;
  }

  /**
   * get width right
   * @return {number}
   */
  getWidthRight() {
    return this.width / 2;
  }

  /**
   * move cluster item
   */
  move() {
    this.repositionX();
    this.repositionY();
  }

  /**
   * attach
   */
  attach() {
    var _context8;
    for (let item of this.data.uiItems) {
      item.cluster = this;
    }
    this.data.items = _mapInstanceProperty(_context8 = this.data.uiItems).call(_context8, item => item.data);
    this.attached = true;
    this.dirty = true;
  }

  /**
   * detach
   * @param {boolean} detachFromParent
   * @return {void}
   */
  detach() {
    let detachFromParent = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : false;
    if (!this.hasItems()) {
      return;
    }
    for (let item of this.data.uiItems) {
      delete item.cluster;
    }
    this.attached = false;
    if (detachFromParent && this.group) {
      this.group.remove(this);
      this.group = null;
    }
    this.data.items = [];
    this.dirty = true;
  }

  /**
   * handle on double click
   */
  _onDoubleClick() {
    this._fit();
  }

  /**
   * set range
   */
  _setupRange() {
    var _context9, _context0, _context1;
    const stats = _mapInstanceProperty(_context9 = this.data.uiItems).call(_context9, item => ({
      start: item.data.start.valueOf(),
      end: item.data.end ? item.data.end.valueOf() : item.data.start.valueOf()
    }));
    this.data.min = Math.min(..._mapInstanceProperty(stats).call(stats, s => Math.min(s.start, s.end || s.start)));
    this.data.max = Math.max(..._mapInstanceProperty(stats).call(stats, s => Math.max(s.start, s.end || s.start)));
    const centers = _mapInstanceProperty(_context0 = this.data.uiItems).call(_context0, item => item.center);
    const avg = _reduceInstanceProperty(centers).call(centers, (sum, value) => sum + value, 0) / this.data.uiItems.length;
    if (_someInstanceProperty(_context1 = this.data.uiItems).call(_context1, item => item.data.end)) {
      // contains ranges
      this.data.start = new Date(this.data.min);
      this.data.end = new Date(this.data.max);
    } else {
      this.data.start = new Date(avg);
      this.data.end = null;
    }
  }

  /**
   * get UI items
   * @return {array}
   */
  _getUiItems() {
    if (this.data.uiItems && this.data.uiItems.length) {
      var _context10;
      return _filterInstanceProperty(_context10 = this.data.uiItems).call(_context10, item => item.cluster === this);
    }
    return [];
  }

  /**
   * create DOM element
   */
  _createDomElement() {
    if (!this.dom) {
      // create DOM
      this.dom = {};

      // create main box
      this.dom.box = document.createElement("DIV");

      // contents box (inside the background box). used for making margins
      this.dom.content = document.createElement("DIV");
      this.dom.content.className = "vis-item-content";
      this.dom.box.appendChild(this.dom.content);
      if (this.options.showStipes) {
        // line to axis
        this.dom.line = document.createElement("DIV");
        this.dom.line.className = "vis-cluster-line";
        this.dom.line.style.display = "none";

        // dot on axis
        this.dom.dot = document.createElement("DIV");
        this.dom.dot.className = "vis-cluster-dot";
        this.dom.dot.style.display = "none";
      }
      if (this.options.fitOnDoubleClick) {
        var _context11;
        this.dom.box.ondblclick = _bindInstanceProperty(_context11 = ClusterItem.prototype._onDoubleClick).call(_context11, this);
      }

      // attach this item as attribute
      this.dom.box["vis-item"] = this;
      this.dirty = true;
    }
  }

  /**
   * append element to DOM
   */
  _appendDomElement() {
    if (!this.parent) {
      throw new Error("Cannot redraw item: no parent attached");
    }
    if (!this.dom.box.parentNode) {
      const foreground = this.parent.dom.foreground;
      if (!foreground) {
        throw new Error("Cannot redraw item: parent has no foreground container element");
      }
      foreground.appendChild(this.dom.box);
    }
    const background = this.parent.dom.background;
    if (this.options.showStipes) {
      if (!this.dom.line.parentNode) {
        if (!background) throw new Error("Cannot redraw item: parent has no background container element");
        background.appendChild(this.dom.line);
      }
      if (!this.dom.dot.parentNode) {
        var axis = this.parent.dom.axis;
        if (!background) throw new Error("Cannot redraw item: parent has no axis container element");
        axis.appendChild(this.dom.dot);
      }
    }
    this.displayed = true;
  }

  /**
   * update dirty DOM components
   */
  _updateDirtyDomComponents() {
    // An item is marked dirty when:
    // - the item is not yet rendered
    // - the item's data is changed
    // - the item is selected/deselected
    if (this.dirty) {
      this._updateContents(this.dom.content);
      this._updateDataAttributes(this.dom.box);
      this._updateStyle(this.dom.box);

      // update class
      const className = this.baseClassName + " " + (this.data.className ? " " + this.data.className : "") + (this.selected ? " vis-selected" : "") + " vis-readonly";
      this.dom.box.className = "vis-item " + className;
      if (this.options.showStipes) {
        this.dom.line.className = "vis-item vis-cluster-line " + (this.selected ? " vis-selected" : "");
        this.dom.dot.className = "vis-item vis-cluster-dot " + (this.selected ? " vis-selected" : "");
      }
      if (this.data.end) {
        // turn off max-width to be able to calculate the real width
        // this causes an extra browser repaint/reflow, but so be it
        this.dom.content.style.maxWidth = "none";
      }
    }
  }

  /**
   * get DOM components sizes
   * @return {object}
   */
  _getDomComponentsSizes() {
    const sizes = {
      previous: {
        right: this.dom.box.style.right,
        left: this.dom.box.style.left
      },
      box: {
        width: this.dom.box.offsetWidth,
        height: this.dom.box.offsetHeight
      }
    };
    if (this.options.showStipes) {
      sizes.dot = {
        height: this.dom.dot.offsetHeight,
        width: this.dom.dot.offsetWidth
      };
      sizes.line = {
        width: this.dom.line.offsetWidth
      };
    }
    return sizes;
  }

  /**
   * update DOM components sizes
   * @param {object} sizes
   */
  _updateDomComponentsSizes(sizes) {
    if (this.options.rtl) {
      this.dom.box.style.right = "0px";
    } else {
      this.dom.box.style.left = "0px";
    }

    // recalculate size
    if (!this.data.end) {
      this.width = sizes.box.width;
    } else {
      this.minWidth = sizes.box.width;
    }
    this.height = sizes.box.height;

    // restore previous position
    if (this.options.rtl) {
      this.dom.box.style.right = sizes.previous.right;
    } else {
      this.dom.box.style.left = sizes.previous.left;
    }
    this.dirty = false;
  }

  /**
   * repaint DOM additional components
   */
  _repaintDomAdditionals() {
    this._repaintOnItemUpdateTimeTooltip(this.dom.box);
  }

  /**
   * check is stripe visible
   * @return {number}
   * @private
   */
  _isStipeVisible() {
    return this.minWidth >= this.width || !this.data.end;
  }

  /**
   * get fit range
   * @return {object}
   * @private
   */
  _getFitRange() {
    const offset = 0.05 * (this.data.max - this.data.min) / 2;
    return {
      fitStart: this.data.min - offset,
      fitEnd: this.data.max + offset
    };
  }

  /**
   * fit
   * @private
   */
  _fit() {
    if (this.emitter) {
      const {
        fitStart,
        fitEnd
      } = this._getFitRange();
      const fitArgs = {
        start: new Date(fitStart),
        end: new Date(fitEnd),
        animation: true
      };
      this.emitter.emit("fit", fitArgs);
    }
  }

  /**
   * get item data
   * @return {object}
   * @private
   */
  _getItemData() {
    return this.data;
  }
}
ClusterItem.prototype.baseClassName = "vis-item vis-range vis-cluster";

const UNGROUPED$2 = "__ungrouped__"; // reserved group id for ungrouped items

const ReservedGroupIds = {
  UNGROUPED: UNGROUPED$2};

/**
 * An Cluster generator generates cluster items
 */
class ClusterGenerator {
  /**
   * @param {ItemSet} itemSet itemsSet instance
   * @constructor ClusterGenerator
   */
  constructor(itemSet) {
    this.itemSet = itemSet;
    this.groups = {};
    this.cache = {};
    this.cache[-1] = [];
  }

  /**
   * @param {Object} itemData             Object containing parameters start content, className.
   * @param {{toScreen: function, toTime: function}} conversion
   *                                  Conversion functions from time to screen and vice versa
   * @param {Object} [options]        Configuration options
   * @return {Object} newItem
   */
  createClusterItem(itemData, conversion, options) {
    const newItem = new ClusterItem(itemData, conversion, options);
    return newItem;
  }

  /**
   * Set the items to be clustered.
   * This will clear cached clusters.
   * @param {Item[]} items
   * @param {Object} [options]  Available options:
   *                            {boolean} applyOnChangedLevel
   *                                If true (default), the changed data is applied
   *                                as soon the cluster level changes. If false,
   *                                The changed data is applied immediately
   */
  setItems(items, options) {
    this.items = items || [];
    this.dataChanged = true;
    this.applyOnChangedLevel = false;
    if (options && options.applyOnChangedLevel) {
      this.applyOnChangedLevel = options.applyOnChangedLevel;
    }
  }

  /**
   * Update the current data set: clear cache, and recalculate the clustering for
   * the current level
   */
  updateData() {
    this.dataChanged = true;
    this.applyOnChangedLevel = false;
  }

  /**
   * Cluster the items which are too close together
   * @param {array} oldClusters
   * @param {number} scale      The scale of the current window : (windowWidth / (endDate - startDate))
   * @param {{maxItems: number, clusterCriteria: function, titleTemplate: string}} options
   * @return {array} clusters
   */
  getClusters(oldClusters, scale, options) {
    let {
      maxItems,
      clusterCriteria
    } = typeof options === "boolean" ? {} : options;
    if (!clusterCriteria) {
      clusterCriteria = () => true;
    }
    maxItems = maxItems || 1;
    let level = -1;
    let granularity = 2;
    let timeWindow = 0;
    if (scale > 0) {
      if (scale >= 1) {
        return [];
      }
      level = Math.abs(Math.round(Math.log(100 / scale) / Math.log(granularity)));
      timeWindow = Math.abs(Math.pow(granularity, level));
    }

    // clear the cache when and re-generate groups the data when needed.
    if (this.dataChanged) {
      const levelChanged = level != this.cacheLevel;
      const applyDataNow = this.applyOnChangedLevel ? levelChanged : true;
      if (applyDataNow) {
        this._dropLevelsCache();
        this._filterData();
      }
    }
    this.cacheLevel = level;
    let clusters = this.cache[level];
    if (!clusters) {
      clusters = [];
      for (let groupName in this.groups) {
        if (!Object.prototype.hasOwnProperty.call(this.groups, groupName)) continue;
        const items = this.groups[groupName];
        const iMax = items.length;
        let i = 0;
        while (i < iMax) {
          // find all items around current item, within the timeWindow
          let item = items[i];
          let neighbors = 1; // start at 1, to include itself)

          // loop through items left from the current item
          let j = i - 1;
          while (j >= 0 && item.center - items[j].center < timeWindow / 2) {
            if (!items[j].cluster && clusterCriteria(item.data, items[j].data)) {
              neighbors++;
            }
            j--;
          }

          // loop through items right from the current item
          let k = i + 1;
          while (k < items.length && items[k].center - item.center < timeWindow / 2) {
            if (clusterCriteria(item.data, items[k].data)) {
              neighbors++;
            }
            k++;
          }

          // loop through the created clusters
          let l = clusters.length - 1;
          while (l >= 0 && item.center - clusters[l].center < timeWindow) {
            if (item.group == clusters[l].group && clusterCriteria(item.data, clusters[l].data)) {
              neighbors++;
            }
            l--;
          }

          // aggregate until the number of items is within maxItems
          if (neighbors > maxItems) {
            // too busy in this window.
            const num = neighbors - maxItems + 1;
            const clusterItems = [];

            // append the items to the cluster,
            // and calculate the average start for the cluster
            let m = i;
            while (clusterItems.length < num && m < items.length) {
              if (clusterCriteria(items[i].data, items[m].data)) {
                clusterItems.push(items[m]);
              }
              m++;
            }
            const groupId = this.itemSet.getGroupId(item.data);
            const group = this.itemSet.groups[groupId] || this.itemSet.groups[ReservedGroupIds.UNGROUPED];
            let cluster = this._getClusterForItems(clusterItems, group, oldClusters, options);
            clusters.push(cluster);
            i += num;
          } else {
            delete item.cluster;
            i += 1;
          }
        }
      }
      this.cache[level] = clusters;
    }
    return clusters;
  }

  /**
   * Filter the items per group.
   * @private
   */
  _filterData() {
    // filter per group
    const groups = {};
    this.groups = groups;

    // split the items per group
    for (const item of _Object$values(this.items)) {
      // put the item in the correct group
      const groupName = item.parent ? item.parent.groupId : "";
      let group = groups[groupName];
      if (!group) {
        group = [];
        groups[groupName] = group;
      }
      group.push(item);

      // calculate the center of the item
      if (item.data.start) {
        if (item.data.end) {
          // range
          item.center = (item.data.start.valueOf() + item.data.end.valueOf()) / 2;
        } else {
          // box, dot
          item.center = item.data.start.valueOf();
        }
      }
    }

    // sort the items per group
    for (let currentGroupName in groups) {
      var _context;
      if (!Object.prototype.hasOwnProperty.call(groups, currentGroupName)) continue;
      _sortInstanceProperty(_context = groups[currentGroupName]).call(_context, (a, b) => a.center - b.center);
    }
    this.dataChanged = false;
  }

  /**
   * Create new cluster or return existing
   * @private
   * @param {array} clusterItems
   * @param {object} group
   * @param {array} oldClusters
   * @param {object} options
   * @returns {object} cluster
   */
  _getClusterForItems(clusterItems, group, oldClusters, options) {
    var _context2;
    const oldClustersLookup = _mapInstanceProperty(_context2 = oldClusters || []).call(_context2, cluster => {
      var _context3;
      return {
        cluster,
        itemsIds: new _Set(_mapInstanceProperty(_context3 = cluster.data.uiItems).call(_context3, item => item.id))
      };
    });
    let cluster;
    if (oldClustersLookup.length) {
      for (let oldClusterData of oldClustersLookup) {
        if (oldClusterData.itemsIds.size === clusterItems.length && _everyInstanceProperty(clusterItems).call(clusterItems, clusterItem => oldClusterData.itemsIds.has(clusterItem.id))) {
          cluster = oldClusterData.cluster;
          break;
        }
      }
    }
    if (cluster) {
      cluster.setUiItems(clusterItems);
      if (cluster.group !== group) {
        if (cluster.group) {
          cluster.group.remove(cluster);
        }
        if (group) {
          group.add(cluster);
          cluster.group = group;
        }
      }
      return cluster;
    }
    let titleTemplate = options.titleTemplate || "";
    const conversion = {
      toScreen: this.itemSet.body.util.toScreen,
      toTime: this.itemSet.body.util.toTime
    };
    const title = titleTemplate.replace(/{count}/, clusterItems.length);
    const clusterContent = '<div title="' + title + '">' + clusterItems.length + "</div>";
    const clusterOptions = _Object$assign({}, options, this.itemSet.options);
    const data = {
      content: clusterContent,
      title: title,
      group: group,
      uiItems: clusterItems,
      eventEmitter: this.itemSet.body.emitter,
      range: this.itemSet.body.range
    };
    cluster = this.createClusterItem(data, conversion, clusterOptions);
    if (group) {
      group.add(cluster);
      cluster.group = group;
    }
    cluster.attach();
    return cluster;
  }

  /**
   * Drop cache
   * @private
   */
  _dropLevelsCache() {
    this.cache = {};
    this.cacheLevel = -1;
    this.cache[this.cacheLevel] = [];
  }
}

const UNGROUPED$1 = "__ungrouped__"; // reserved group id for ungrouped items
const BACKGROUND = "__background__"; // reserved group id for background items without group

/**
 * An ItemSet holds a set of items and ranges which can be displayed in a
 * range. The width is determined by the parent of the ItemSet, and the height
 * is determined by the size of the items.
 */
class ItemSet extends Component {
  /**
   * @param {{dom: Object, domProps: Object, emitter: Emitter, range: Range}} body
   * @param {Object} [options]      See ItemSet.setOptions for the available options.
   * @constructor ItemSet
   * @extends Component
   */
  constructor(body, options) {
    super();
    this.body = body;
    this.defaultOptions = {
      type: null,
      // 'box', 'point', 'range', 'background'
      orientation: {
        item: "bottom" // item orientation: 'top' or 'bottom'
      },
      align: "auto",
      // alignment of box items
      stack: true,
      stackSubgroups: true,
      groupOrderSwap(fromGroup, toGroup) {
        const targetOrder = toGroup.order;
        toGroup.order = fromGroup.order;
        fromGroup.order = targetOrder;
      },
      groupOrder: "order",
      selectable: true,
      multiselect: false,
      longSelectPressTime: 251,
      itemsAlwaysDraggable: {
        item: false,
        range: false
      },
      editable: {
        updateTime: false,
        updateGroup: false,
        add: false,
        remove: false,
        overrideItems: false
      },
      groupEditable: {
        order: false,
        add: false,
        remove: false
      },
      snap: TimeStep.snap,
      // Only called when `objectData.target === 'item'.
      onDropObjectOnItem(_objectData, item, callback) {
        callback(item);
      },
      onAdd(item, callback) {
        callback(item);
      },
      onUpdate(item, callback) {
        callback(item);
      },
      onMove(item, callback) {
        callback(item);
      },
      onRemove(item, callback) {
        callback(item);
      },
      onMoving(item, callback) {
        callback(item);
      },
      onAddGroup(item, callback) {
        callback(item);
      },
      onMoveGroup(item, callback) {
        callback(item);
      },
      onRemoveGroup(item, callback) {
        callback(item);
      },
      margin: {
        item: {
          horizontal: 10,
          vertical: 10
        },
        axis: 20
      },
      showTooltips: true,
      tooltip: {
        followMouse: false,
        overflowMethod: "flip",
        delay: 500
      },
      tooltipOnItemUpdateTime: false
    };

    // options is shared by this ItemSet and all its items
    this.options = availableUtils.extend({}, this.defaultOptions);
    this.options.rtl = options.rtl;
    this.options.onTimeout = options.onTimeout;
    this.conversion = {
      toScreen: body.util.toScreen,
      toTime: body.util.toTime
    };
    this.dom = {};
    this.props = {};
    this.hammer = null;
    const me = this;
    this.itemsData = null; // DataSet
    this.groupsData = null; // DataSet
    this.itemsSettingTime = null;
    this.initialItemSetDrawn = false;
    this.userContinueNotBail = null;
    this.sequentialSelection = false;

    // listeners for the DataSet of the items
    this.itemListeners = {
      add(_event, params) {
        me._onAdd(params.items);
        if (me.options.cluster) {
          me.clusterGenerator.setItems(me.items, {
            applyOnChangedLevel: false
          });
        }
        me.redraw();
      },
      update(_event, params) {
        me._onUpdate(params.items);
        if (me.options.cluster) {
          me.clusterGenerator.setItems(me.items, {
            applyOnChangedLevel: false
          });
        }
        me.redraw();
      },
      remove(_event, params) {
        me._onRemove(params.items);
        if (me.options.cluster) {
          me.clusterGenerator.setItems(me.items, {
            applyOnChangedLevel: false
          });
        }
        me.redraw();
      }
    };

    // listeners for the DataSet of the groups
    this.groupListeners = {
      add(_event, params, senderId) {
        me._onAddGroups(params.items);
        if (me.groupsData && me.groupsData.length > 0) {
          var _context;
          const groupsData = me.groupsData.getDataSet();
          _forEachInstanceProperty(_context = groupsData.get()).call(_context, groupData => {
            if (groupData.nestedGroups) {
              var _context2;
              if (groupData.showNested != false) {
                groupData.showNested = true;
              }
              let updatedGroups = [];
              _forEachInstanceProperty(_context2 = groupData.nestedGroups).call(_context2, nestedGroupId => {
                const updatedNestedGroup = groupsData.get(nestedGroupId);
                if (!updatedNestedGroup) {
                  return;
                }
                updatedNestedGroup.nestedInGroup = groupData.id;
                if (groupData.showNested == false) {
                  updatedNestedGroup.visible = false;
                }
                updatedGroups = _concatInstanceProperty(updatedGroups).call(updatedGroups, updatedNestedGroup);
              });
              groupsData.update(updatedGroups, senderId);
            }
          });
        }
      },
      update(_event, params) {
        me._onUpdateGroups(params.items);
      },
      remove(_event, params) {
        me._onRemoveGroups(params.items);
      }
    };
    this.items = {}; // object with an Item for every data item
    this.groups = {}; // Group object for every group
    this.groupIds = [];
    this.selection = []; // list with the ids of all selected nodes

    this.popup = null;
    this.popupTimer = null;
    this.touchParams = {}; // stores properties while dragging
    this.groupTouchParams = {
      group: null,
      isDragging: false
    };

    // create the HTML DOM
    this._create();
    this.setOptions(options);
    this.clusters = [];
  }

  /**
   * Create the HTML DOM for the ItemSet
   */
  _create() {
    var _context3, _context4, _context5, _context6, _context7, _context8, _context9, _context0, _context1, _context10, _context11, _context12, _context13, _context14, _context15;
    const frame = document.createElement("div");
    frame.className = "vis-itemset";
    frame["vis-itemset"] = this;
    this.dom.frame = frame;

    // create background panel
    const background = document.createElement("div");
    background.className = "vis-background";
    frame.appendChild(background);
    this.dom.background = background;

    // create foreground panel
    const foreground = document.createElement("div");
    foreground.className = "vis-foreground";
    frame.appendChild(foreground);
    this.dom.foreground = foreground;

    // create axis panel
    const axis = document.createElement("div");
    axis.className = "vis-axis";
    this.dom.axis = axis;

    // create labelset
    const labelSet = document.createElement("div");
    labelSet.className = "vis-labelset";
    this.dom.labelSet = labelSet;

    // create ungrouped Group
    this._updateUngrouped();

    // create background Group
    const backgroundGroup = new BackgroundGroup(BACKGROUND, null, this);
    backgroundGroup.show();
    this.groups[BACKGROUND] = backgroundGroup;

    // attach event listeners
    // Note: we bind to the centerContainer for the case where the height
    //       of the center container is larger than of the ItemSet, so we
    //       can click in the empty area to create a new item or deselect an item.
    this.hammer = new Hammer(this.body.dom.centerContainer);

    // drag items when selected
    this.hammer.on("hammer.input", event => {
      if (event.isFirst) {
        this._onTouch(event);
      }
    });
    this.hammer.on("panstart", _bindInstanceProperty(_context3 = this._onDragStart).call(_context3, this));
    this.hammer.on("panmove", _bindInstanceProperty(_context4 = this._onDrag).call(_context4, this));
    this.hammer.on("panend", _bindInstanceProperty(_context5 = this._onDragEnd).call(_context5, this));
    this.hammer.get("pan").set({
      threshold: 5,
      direction: Hammer.ALL
    });
    // delay addition on item click for trackpads...
    this.hammer.get("press").set({
      time: 10000
    });

    // single select (or unselect) when tapping an item
    this.hammer.on("tap", _bindInstanceProperty(_context6 = this._onSelectItem).call(_context6, this));

    // multi select when holding mouse/touch, or on ctrl+click
    this.hammer.on("press", _bindInstanceProperty(_context7 = this._onMultiSelectItem).call(_context7, this));
    // delay addition on item click for trackpads...
    this.hammer.get("press").set({
      time: 10000
    });

    // add item on doubletap
    this.hammer.on("doubletap", _bindInstanceProperty(_context8 = this._onAddItem).call(_context8, this));
    if (this.options.rtl) {
      this.groupHammer = new Hammer(this.body.dom.rightContainer);
    } else {
      this.groupHammer = new Hammer(this.body.dom.leftContainer);
    }
    this.groupHammer.on("tap", _bindInstanceProperty(_context9 = this._onGroupClick).call(_context9, this));
    this.groupHammer.on("panstart", _bindInstanceProperty(_context0 = this._onGroupDragStart).call(_context0, this));
    this.groupHammer.on("panmove", _bindInstanceProperty(_context1 = this._onGroupDrag).call(_context1, this));
    this.groupHammer.on("panend", _bindInstanceProperty(_context10 = this._onGroupDragEnd).call(_context10, this));
    this.groupHammer.get("pan").set({
      threshold: 5,
      direction: Hammer.DIRECTION_VERTICAL
    });
    this.body.dom.centerContainer.addEventListener("mouseover", _bindInstanceProperty(_context11 = this._onMouseOver).call(_context11, this));
    this.body.dom.centerContainer.addEventListener("mouseout", _bindInstanceProperty(_context12 = this._onMouseOut).call(_context12, this));
    this.body.dom.centerContainer.addEventListener("mousemove", _bindInstanceProperty(_context13 = this._onMouseMove).call(_context13, this));
    // right-click on timeline
    this.body.dom.centerContainer.addEventListener("contextmenu", _bindInstanceProperty(_context14 = this._onDragEnd).call(_context14, this));
    this.body.dom.centerContainer.addEventListener("mousewheel", _bindInstanceProperty(_context15 = this._onMouseWheel).call(_context15, this));

    // attach to the DOM
    this.show();
  }

  /**
   * Set options for the ItemSet. Existing options will be extended/overwritten.
   * @param {Object} [options] The following options are available:
   *                           {string} type
   *                              Default type for the items. Choose from 'box'
   *                              (default), 'point', 'range', or 'background'.
   *                              The default style can be overwritten by
   *                              individual items.
   *                           {string} align
   *                              Alignment for the items, only applicable for
   *                              BoxItem. Choose 'center' (default), 'left', or
   *                              'right'.
   *                           {string} orientation.item
   *                              Orientation of the item set. Choose 'top' or
   *                              'bottom' (default).
   *                           {Function} groupOrder
   *                              A sorting function for ordering groups
   *                           {boolean} stack
   *                              If true (default), items will be stacked on
   *                              top of each other.
   *                           {number} margin.axis
   *                              Margin between the axis and the items in pixels.
   *                              Default is 20.
   *                           {number} margin.item.horizontal
   *                              Horizontal margin between items in pixels.
   *                              Default is 10.
   *                           {number} margin.item.vertical
   *                              Vertical Margin between items in pixels.
   *                              Default is 10.
   *                           {number} margin.item
   *                              Margin between items in pixels in both horizontal
   *                              and vertical direction. Default is 10.
   *                           {number} margin
   *                              Set margin for both axis and items in pixels.
   *                           {boolean} selectable
   *                              If true (default), items can be selected.
   *                           {boolean} multiselect
   *                              If true, multiple items can be selected.
   *                              False by default.
   *                           {boolean} editable
   *                              Set all editable options to true or false
   *                           {boolean} editable.updateTime
   *                              Allow dragging an item to an other moment in time
   *                           {boolean} editable.updateGroup
   *                              Allow dragging an item to an other group
   *                           {boolean} editable.add
   *                              Allow creating new items on double tap
   *                           {boolean} editable.remove
   *                              Allow removing items by clicking the delete button
   *                              top right of a selected item.
   *                           {Function(item: Item, callback: Function)} onAdd
   *                              Callback function triggered when an item is about to be added:
   *                              when the user double taps an empty space in the Timeline.
   *                           {Function(item: Item, callback: Function)} onUpdate
   *                              Callback function fired when an item is about to be updated.
   *                              This function typically has to show a dialog where the user
   *                              change the item. If not implemented, nothing happens.
   *                           {Function(item: Item, callback: Function)} onMove
   *                              Fired when an item has been moved. If not implemented,
   *                              the move action will be accepted.
   *                           {Function(item: Item, callback: Function)} onRemove
   *                              Fired when an item is about to be deleted.
   *                              If not implemented, the item will be always removed.
   */
  setOptions(options) {
    if (options) {
      var _context16, _context18;
      // copy all options that we know
      const fields = ["type", "rtl", "align", "order", "stack", "stackSubgroups", "selectable", "multiselect", "sequentialSelection", "multiselectPerGroup", "longSelectPressTime", "groupOrder", "dataAttributes", "template", "groupTemplate", "visibleFrameTemplate", "hide", "snap", "groupOrderSwap", "showTooltips", "tooltip", "tooltipOnItemUpdateTime", "groupHeightMode", "onTimeout"];
      availableUtils.selectiveExtend(fields, this.options, options);
      if ("itemsAlwaysDraggable" in options) {
        if (typeof options.itemsAlwaysDraggable === "boolean") {
          this.options.itemsAlwaysDraggable.item = options.itemsAlwaysDraggable;
          this.options.itemsAlwaysDraggable.range = false;
        } else if (typeof options.itemsAlwaysDraggable === "object") {
          availableUtils.selectiveExtend(["item", "range"], this.options.itemsAlwaysDraggable, options.itemsAlwaysDraggable);
          // only allow range always draggable when item is always draggable as well
          if (!this.options.itemsAlwaysDraggable.item) {
            this.options.itemsAlwaysDraggable.range = false;
          }
        }
      }
      if ("sequentialSelection" in options) {
        if (typeof options.sequentialSelection === "boolean") {
          this.options.sequentialSelection = options.sequentialSelection;
        }
      }
      if ("orientation" in options) {
        if (typeof options.orientation === "string") {
          this.options.orientation.item = options.orientation === "top" ? "top" : "bottom";
        } else if (typeof options.orientation === "object" && "item" in options.orientation) {
          this.options.orientation.item = options.orientation.item;
        }
      }
      if ("margin" in options) {
        if (typeof options.margin === "number") {
          this.options.margin.axis = options.margin;
          this.options.margin.item.horizontal = options.margin;
          this.options.margin.item.vertical = options.margin;
        } else if (typeof options.margin === "object") {
          availableUtils.selectiveExtend(["axis"], this.options.margin, options.margin);
          if ("item" in options.margin) {
            if (typeof options.margin.item === "number") {
              this.options.margin.item.horizontal = options.margin.item;
              this.options.margin.item.vertical = options.margin.item;
            } else if (typeof options.margin.item === "object") {
              availableUtils.selectiveExtend(["horizontal", "vertical"], this.options.margin.item, options.margin.item);
            }
          }
        }
      }
      _forEachInstanceProperty(_context16 = ["locale", "locales"]).call(_context16, key => {
        if (key in options) {
          this.options[key] = options[key];
        }
      });
      if ("editable" in options) {
        if (typeof options.editable === "boolean") {
          this.options.editable.updateTime = options.editable;
          this.options.editable.updateGroup = options.editable;
          this.options.editable.add = options.editable;
          this.options.editable.remove = options.editable;
          this.options.editable.overrideItems = false;
        } else if (typeof options.editable === "object") {
          availableUtils.selectiveExtend(["updateTime", "updateGroup", "add", "remove", "overrideItems"], this.options.editable, options.editable);
        }
      }
      if ("groupEditable" in options) {
        if (typeof options.groupEditable === "boolean") {
          this.options.groupEditable.order = options.groupEditable;
          this.options.groupEditable.add = options.groupEditable;
          this.options.groupEditable.remove = options.groupEditable;
        } else if (typeof options.groupEditable === "object") {
          availableUtils.selectiveExtend(["order", "add", "remove"], this.options.groupEditable, options.groupEditable);
        }
      }

      // callback functions
      const addCallback = name => {
        const fn = options[name];
        if (fn) {
          if (!(typeof fn === "function")) {
            var _context17;
            throw new Error(_concatInstanceProperty(_context17 = "option ".concat(name, " must be a function ")).call(_context17, name, "(item, callback)"));
          }
          this.options[name] = fn;
        }
      };
      _forEachInstanceProperty(_context18 = ["onDropObjectOnItem", "onAdd", "onUpdate", "onRemove", "onMove", "onMoving", "onAddGroup", "onMoveGroup", "onRemoveGroup"]).call(_context18, addCallback);
      if (options.cluster) {
        _Object$assign(this.options, {
          cluster: options.cluster
        });
        if (!this.clusterGenerator) {
          this.clusterGenerator = new ClusterGenerator(this);
        }
        this.clusterGenerator.setItems(this.items, {
          applyOnChangedLevel: false
        });
        this.markDirty({
          refreshItems: true,
          restackGroups: true
        });
        this.redraw();
      } else if (this.clusterGenerator) {
        this._detachAllClusters();
        this.clusters = [];
        this.clusterGenerator = null;
        this.options.cluster = undefined;
        this.markDirty({
          refreshItems: true,
          restackGroups: true
        });
        this.redraw();
      } else {
        // force the itemSet to refresh: options like orientation and margins may be changed
        this.markDirty();
      }
    }
  }

  /**
   * Mark the ItemSet dirty so it will refresh everything with next redraw.
   * Optionally, all items can be marked as dirty and be refreshed.
   * @param {{refreshItems: boolean}} [options]
   */
  markDirty(options) {
    this.groupIds = [];
    if (options) {
      if (options.refreshItems) {
        _forEachInstanceProperty(availableUtils).call(availableUtils, this.items, item => {
          item.dirty = true;
          if (item.displayed) item.redraw();
        });
      }
      if (options.restackGroups) {
        _forEachInstanceProperty(availableUtils).call(availableUtils, this.groups, (group, key) => {
          if (key === BACKGROUND) return;
          group.stackDirty = true;
        });
      }
    }
  }

  /**
   * Destroy the ItemSet
   */
  destroy() {
    this.clearPopupTimer();
    this.hide();
    this.setItems(null);
    this.setGroups(null);
    this.hammer && this.hammer.destroy();
    this.groupHammer && this.groupHammer.destroy();
    this.hammer = null;
    this.body = null;
    this.conversion = null;
  }

  /**
   * Hide the component from the DOM
   */
  hide() {
    // remove the frame containing the items
    if (this.dom.frame.parentNode) {
      this.dom.frame.parentNode.removeChild(this.dom.frame);
    }

    // remove the axis with dots
    if (this.dom.axis.parentNode) {
      this.dom.axis.parentNode.removeChild(this.dom.axis);
    }

    // remove the labelset containing all group labels
    if (this.dom.labelSet.parentNode) {
      this.dom.labelSet.parentNode.removeChild(this.dom.labelSet);
    }
  }

  /**
   * Show the component in the DOM (when not already visible).
   */
  show() {
    // show frame containing the items
    if (!this.dom.frame.parentNode) {
      this.body.dom.center.appendChild(this.dom.frame);
    }

    // show axis with dots
    if (!this.dom.axis.parentNode) {
      this.body.dom.backgroundVertical.appendChild(this.dom.axis);
    }

    // show labelset containing labels
    if (!this.dom.labelSet.parentNode) {
      if (this.options.rtl) {
        this.body.dom.right.appendChild(this.dom.labelSet);
      } else {
        this.body.dom.left.appendChild(this.dom.labelSet);
      }
    }
  }

  /**
   * Activates the popup timer to show the given popup after a fixed time.
   * @param {Popup} popup
   */
  setPopupTimer(popup) {
    this.clearPopupTimer();
    if (popup) {
      const delay = this.options.tooltip.delay || typeof this.options.tooltip.delay === "number" ? this.options.tooltip.delay : 500;
      this.popupTimer = _setTimeout(function () {
        popup.show();
      }, delay);
    }
  }

  /**
   * Clears the popup timer for the tooltip.
   */
  clearPopupTimer() {
    if (this.popupTimer != null) {
      clearTimeout(this.popupTimer);
      this.popupTimer = null;
    }
  }

  /**
   * Set selected items by their id. Replaces the current selection
   * Unknown id's are silently ignored.
   * @param {string[] | string} [ids] An array with zero or more id's of the items to be
   *                                  selected, or a single item id. If ids is undefined
   *                                  or an empty array, all items will be unselected.
   */
  setSelection(ids) {
    var _context19;
    if (ids == undefined) {
      ids = [];
    }
    if (!_Array$isArray(ids)) {
      ids = [ids];
    }
    const idsToDeselect = _filterInstanceProperty(_context19 = this.selection).call(_context19, id => _indexOfInstanceProperty(ids).call(ids, id) === -1);

    // unselect currently selected items
    for (let selectedId of idsToDeselect) {
      const item = this.getItemById(selectedId);
      if (item) {
        item.unselect();
      }
    }

    // select items
    this.selection = [...ids];
    for (let id of ids) {
      const item = this.getItemById(id);
      if (item) {
        item.select();
      }
    }
  }

  /**
   * Get the selected items by their id
   * @return {Array} ids  The ids of the selected items
   */
  getSelection() {
    var _context20;
    return _concatInstanceProperty(_context20 = this.selection).call(_context20, []);
  }

  /**
   * Get the id's of the currently visible items.
   * @returns {Array} The ids of the visible items
   */
  getVisibleItems() {
    const range = this.body.range.getRange();
    let right;
    let left;
    if (this.options.rtl) {
      right = this.body.util.toScreen(range.start);
      left = this.body.util.toScreen(range.end);
    } else {
      left = this.body.util.toScreen(range.start);
      right = this.body.util.toScreen(range.end);
    }
    const ids = [];
    for (const groupId in this.groups) {
      if (!Object.prototype.hasOwnProperty.call(this.groups, groupId)) continue;
      const group = this.groups[groupId];
      const rawVisibleItems = group.isVisible ? group.visibleItems : [];

      // filter the "raw" set with visibleItems into a set which is really
      // visible by pixels
      for (const item of rawVisibleItems) {
        // TODO: also check whether visible vertically
        if (this.options.rtl) {
          if (item.right < left && item.right + item.width > right) {
            ids.push(item.id);
          }
        } else {
          if (item.left < right && item.left + item.width > left) {
            ids.push(item.id);
          }
        }
      }
    }
    return ids;
  }

  /**
   * Get the id's of the items at specific time, where a click takes place on the timeline.
   * @param {Date} timeOfEvent The point in time to query items.
   * @returns {Array} The ids of all items in existence at the time of click event on the timeline.
   */
  getItemsAtCurrentTime(timeOfEvent) {
    let right;
    let left;
    if (this.options.rtl) {
      right = this.body.util.toScreen(timeOfEvent);
      left = this.body.util.toScreen(timeOfEvent);
    } else {
      left = this.body.util.toScreen(timeOfEvent);
      right = this.body.util.toScreen(timeOfEvent);
    }
    const ids = [];
    for (const groupId in this.groups) {
      if (!Object.prototype.hasOwnProperty.call(this.groups, groupId)) continue;
      const group = this.groups[groupId];
      const rawVisibleItems = group.isVisible ? group.visibleItems : [];

      // filter the "raw" set with visibleItems into a set which is really
      // visible by pixels
      for (const item of rawVisibleItems) {
        if (this.options.rtl) {
          if (item.right < left && item.right + item.width > right) {
            ids.push(item.id);
          }
        } else {
          if (item.left < right && item.left + item.width > left) {
            ids.push(item.id);
          }
        }
      }
    }
    return ids;
  }

  /**
   * Get the id's of the currently visible groups.
   * @returns {Array} The ids of the visible groups
   */
  getVisibleGroups() {
    const ids = [];
    for (const groupId in this.groups) {
      if (!Object.prototype.hasOwnProperty.call(this.groups, groupId)) continue;
      const group = this.groups[groupId];
      if (group.isVisible) ids.push(groupId);
    }
    return ids;
  }

  /**
   * get item by id
   * @param {string} id
   * @return {object} item
   */
  getItemById(id) {
    var _context21;
    return this.items[id] || _findInstanceProperty(_context21 = this.clusters).call(_context21, cluster => cluster.id === id);
  }

  /**
   * Deselect a selected item
   * @param {string | number} id
   * @private
   */
  _deselect(id) {
    const selection = this.selection;
    for (let i = 0, ii = selection.length; i < ii; i++) {
      if (selection[i] == id) {
        // non-strict comparison!
        _spliceInstanceProperty(selection).call(selection, i, 1);
        break;
      }
    }
  }

  /**
   * Repaint the component
   * @return {boolean} Returns true if the component is resized
   */
  redraw() {
    const margin = this.options.margin;
    const range = this.body.range;
    const asSize = availableUtils.option.asSize;
    const options = this.options;
    const orientation = options.orientation.item;
    let resized = false;
    const frame = this.dom.frame;

    // recalculate absolute position (before redrawing groups)
    this.props.top = this.body.domProps.top.height + this.body.domProps.border.top;
    if (this.options.rtl) {
      this.props.right = this.body.domProps.right.width + this.body.domProps.border.right;
    } else {
      this.props.left = this.body.domProps.left.width + this.body.domProps.border.left;
    }

    // update class name
    frame.className = "vis-itemset";
    if (this.options.cluster) {
      this._clusterItems();
    }

    // reorder the groups (if needed)
    resized = this._orderGroups() || resized;

    // check whether zoomed (in that case we need to re-stack everything)
    // TODO: would be nicer to get this as a trigger from Range
    const visibleInterval = range.end - range.start;
    const zoomed = visibleInterval != this.lastVisibleInterval || this.props.width != this.props.lastWidth;
    const scrolled = range.start != this.lastRangeStart;
    const changedStackOption = options.stack != this.lastStack;
    const changedStackSubgroupsOption = options.stackSubgroups != this.lastStackSubgroups;
    const forceRestack = zoomed || scrolled || changedStackOption || changedStackSubgroupsOption;
    this.lastVisibleInterval = visibleInterval;
    this.lastRangeStart = range.start;
    this.lastStack = options.stack;
    this.lastStackSubgroups = options.stackSubgroups;
    this.props.lastWidth = this.props.width;
    const firstGroup = this._firstGroup();
    const firstMargin = {
      item: margin.item,
      axis: margin.axis
    };
    const nonFirstMargin = {
      item: margin.item,
      axis: margin.item.vertical / 2
    };
    let height = 0;
    const minHeight = margin.axis + margin.item.vertical;

    // redraw the background group
    this.groups[BACKGROUND].redraw(range, nonFirstMargin, forceRestack);
    const redrawQueue = {};
    let redrawQueueLength = 0;

    // collect redraw functions
    _forEachInstanceProperty(availableUtils).call(availableUtils, this.groups, (group, key) => {
      if (key === BACKGROUND) return;
      const groupMargin = group == firstGroup ? firstMargin : nonFirstMargin;
      const returnQueue = true;
      redrawQueue[key] = group.redraw(range, groupMargin, forceRestack, returnQueue);
      redrawQueueLength = redrawQueue[key].length;
    });
    const needRedraw = redrawQueueLength > 0;
    if (needRedraw) {
      const redrawResults = {};
      for (let i = 0; i < redrawQueueLength; i++) {
        _forEachInstanceProperty(availableUtils).call(availableUtils, redrawQueue, (fns, key) => {
          redrawResults[key] = fns[i]();
        });
      }

      // redraw all regular groups
      _forEachInstanceProperty(availableUtils).call(availableUtils, this.groups, (group, key) => {
        if (key === BACKGROUND) return;
        const groupResized = redrawResults[key];
        resized = groupResized || resized;
        height += group.height;
      });
      height = Math.max(height, minHeight);
    }
    height = Math.max(height, minHeight);

    // update frame height
    frame.style.height = asSize(height);

    // calculate actual size
    this.props.width = frame.offsetWidth;
    this.props.height = height;

    // reposition axis
    this.dom.axis.style.top = asSize(orientation == "top" ? this.body.domProps.top.height + this.body.domProps.border.top : this.body.domProps.top.height + this.body.domProps.centerContainer.height);
    if (this.options.rtl) {
      this.dom.axis.style.right = "0";
    } else {
      this.dom.axis.style.left = "0";
    }
    this.hammer.get("press").set({
      time: this.options.longSelectPressTime
    });
    this.initialItemSetDrawn = true;
    // check if this component is resized
    resized = this._isResized() || resized;
    return resized;
  }

  /**
   * Get the first group, aligned with the axis
   * @return {Group | null} firstGroup
   * @private
   */
  _firstGroup() {
    const firstGroupIndex = this.options.orientation.item == "top" ? 0 : this.groupIds.length - 1;
    const firstGroupId = this.groupIds[firstGroupIndex];
    const firstGroup = this.groups[firstGroupId] || this.groups[UNGROUPED$1];
    return firstGroup || null;
  }

  /**
   * Create or delete the group holding all ungrouped items. This group is used when
   * there are no groups specified.
   * @protected
   */
  _updateUngrouped() {
    let ungrouped = this.groups[UNGROUPED$1];
    let item;
    let itemId;
    if (this.groupsData) {
      // remove the group holding all ungrouped items
      if (ungrouped) {
        ungrouped.dispose();
        delete this.groups[UNGROUPED$1];
        for (itemId in this.items) {
          if (!Object.prototype.hasOwnProperty.call(this.items, itemId)) continue;
          item = this.items[itemId];
          item.parent && item.parent.remove(item);
          const groupId = this.getGroupId(item.data);
          const group = this.groups[groupId];
          group && group.add(item) || item.hide();
        }
      }
    } else {
      // create a group holding all (unfiltered) items
      if (!ungrouped) {
        const id = null;
        const data = null;
        ungrouped = new Group(id, data, this);
        this.groups[UNGROUPED$1] = ungrouped;
        for (itemId in this.items) {
          if (!Object.prototype.hasOwnProperty.call(this.items, itemId)) continue;
          item = this.items[itemId];
          ungrouped.add(item);
        }
        ungrouped.show();
      }
    }
  }

  /**
   * Get the element for the labelset
   * @return {HTMLElement} labelSet
   */
  getLabelSet() {
    return this.dom.labelSet;
  }

  /**
   * Set items
   * @param {vis.DataSet | null} items
   */
  setItems(items) {
    this.itemsSettingTime = new Date();
    const me = this;
    let ids;
    const oldItemsData = this.itemsData;

    // replace the dataset
    if (!items) {
      this.itemsData = null;
    } else if (isDataViewLike(items)) {
      this.itemsData = typeCoerceDataSet(items);
    } else {
      throw new TypeError("Data must implement the interface of DataSet or DataView");
    }
    if (oldItemsData) {
      // unsubscribe from old dataset
      _forEachInstanceProperty(availableUtils).call(availableUtils, this.itemListeners, (callback, event) => {
        oldItemsData.off(event, callback);
      });

      // stop maintaining a coerced version of the old data set
      oldItemsData.dispose();

      // remove all drawn items
      ids = oldItemsData.getIds();
      this._onRemove(ids);
    }
    if (this.itemsData) {
      // subscribe to new dataset
      const id = this.id;
      _forEachInstanceProperty(availableUtils).call(availableUtils, this.itemListeners, (callback, event) => {
        me.itemsData.on(event, callback, id);
      });

      // add all new items
      ids = this.itemsData.getIds();
      this._onAdd(ids);

      // update the group holding all ungrouped items
      this._updateUngrouped();
    }
    this.body.emitter.emit("_change", {
      queue: true
    });
  }

  /**
   * Get the current items
   * @returns {vis.DataSet | null}
   */
  getItems() {
    return this.itemsData != null ? this.itemsData.rawDS : null;
  }

  /**
   * Set groups
   * @param {vis.DataSet} groups
   */
  setGroups(groups) {
    const me = this;
    let ids;

    // unsubscribe from current dataset
    if (this.groupsData) {
      _forEachInstanceProperty(availableUtils).call(availableUtils, this.groupListeners, (callback, event) => {
        me.groupsData.off(event, callback);
      });

      // remove all drawn groups
      ids = this.groupsData.getIds();
      this.groupsData = null;
      this._onRemoveGroups(ids); // note: this will cause a redraw
    }

    // replace the dataset
    if (!groups) {
      this.groupsData = null;
    } else if (isDataViewLike(groups)) {
      this.groupsData = groups;
    } else {
      throw new TypeError("Data must implement the interface of DataSet or DataView");
    }
    if (this.groupsData) {
      var _context22;
      // go over all groups nesting
      const groupsData = this.groupsData.getDataSet();
      _forEachInstanceProperty(_context22 = groupsData.get()).call(_context22, group => {
        if (group.nestedGroups) {
          var _context23;
          _forEachInstanceProperty(_context23 = group.nestedGroups).call(_context23, nestedGroupId => {
            const updatedNestedGroup = groupsData.get(nestedGroupId);
            updatedNestedGroup.nestedInGroup = group.id;
            if (group.showNested == false) {
              updatedNestedGroup.visible = false;
            }
            groupsData.update(updatedNestedGroup);
          });
        }
      });

      // subscribe to new dataset
      const id = this.id;
      _forEachInstanceProperty(availableUtils).call(availableUtils, this.groupListeners, (callback, event) => {
        me.groupsData.on(event, callback, id);
      });

      // draw all ms
      ids = this.groupsData.getIds();
      this._onAddGroups(ids);
    }

    // update the group holding all ungrouped items
    this._updateUngrouped();

    // update the order of all items in each group
    this._order();
    if (this.options.cluster) {
      this.clusterGenerator.updateData();
      this._clusterItems();
      this.markDirty({
        refreshItems: true,
        restackGroups: true
      });
    }
    this.body.emitter.emit("_change", {
      queue: true
    });
  }

  /**
   * Get the current groups
   * @returns {vis.DataSet | null} groups
   */
  getGroups() {
    return this.groupsData;
  }

  /**
   * Remove an item by its id
   * @param {string | number} id
   */
  removeItem(id) {
    const item = this.itemsData.get(id);
    if (item) {
      // confirm deletion
      this.options.onRemove(item, item => {
        if (item) {
          // remove by id here, it is possible that an item has no id defined
          // itself, so better not delete by the item itself
          this.itemsData.remove(id);
        }
      });
    }
  }

  /**
   * Get the time of an item based on it's data and options.type
   * @param {Object} itemData
   * @returns {string} Returns the type
   * @private
   */
  _getType(itemData) {
    return itemData.type || this.options.type || (itemData.end ? "range" : "box");
  }

  /**
   * Get the group id for an item
   * @param {Object} itemData
   * @returns {string} Returns the groupId
   * @private
   */
  getGroupId(itemData) {
    const type = this._getType(itemData);
    if (type == "background" && itemData.group == undefined) {
      return BACKGROUND;
    } else {
      return this.groupsData ? itemData.group : UNGROUPED$1;
    }
  }

  /**
   * Handle updated items
   * @param {number[]} ids
   * @protected
   */
  _onUpdate(ids) {
    const me = this;
    _forEachInstanceProperty(ids).call(ids, id => {
      const itemData = me.itemsData.get(id);
      let item = me.items[id];
      const type = itemData ? me._getType(itemData) : null;
      const constructor = ItemSet.types[type];
      let selected;
      if (item) {
        // update item
        if (!constructor || !(item instanceof constructor)) {
          // item type has changed, delete the item and recreate it
          selected = item.selected; // preserve selection of this item
          me._removeItem(item);
          item = null;
        } else {
          me._updateItem(item, itemData);
        }
      }
      if (!item && itemData) {
        // create item
        if (constructor) {
          item = new constructor(itemData, me.conversion, me.options);
          item.id = id; // TODO: not so nice setting id afterwards

          me._addItem(item);
          if (selected) {
            this.selection.push(id);
            item.select();
          }
        } else {
          throw new TypeError("Unknown item type \"".concat(type, "\""));
        }
      }
    });
    this._order();
    if (this.options.cluster) {
      this.clusterGenerator.setItems(this.items, {
        applyOnChangedLevel: false
      });
      this._clusterItems();
    }
    this.body.emitter.emit("_change", {
      queue: true
    });
  }

  /**
   * Handle removed items
   * @param {number[]} ids
   * @protected
   */
  _onRemove(ids) {
    let count = 0;
    const me = this;
    _forEachInstanceProperty(ids).call(ids, id => {
      const item = me.items[id];
      if (item) {
        count++;
        me._removeItem(item);
      }
    });
    if (count) {
      // update order
      this._order();
      this.body.emitter.emit("_change", {
        queue: true
      });
    }
  }

  /**
   * Update the order of item in all groups
   * @private
   */
  _order() {
    // reorder the items in all groups
    // TODO: optimization: only reorder groups affected by the changed items
    _forEachInstanceProperty(availableUtils).call(availableUtils, this.groups, group => {
      group.order();
    });
  }

  /**
   * Handle updated groups
   * @param {number[]} ids
   * @private
   */
  _onUpdateGroups(ids) {
    this._onAddGroups(ids);
  }

  /**
   * Handle changed groups (added or updated)
   * @param {number[]} ids
   * @private
   */
  _onAddGroups(ids) {
    const me = this;
    _forEachInstanceProperty(ids).call(ids, id => {
      const groupData = me.groupsData.get(id);
      let group = me.groups[id];
      if (!group) {
        // check for reserved ids
        if (id == UNGROUPED$1 || id == BACKGROUND) {
          throw new Error("Illegal group id. ".concat(id, " is a reserved id."));
        }
        const groupOptions = _Object$create(me.options);
        availableUtils.extend(groupOptions, {
          height: null
        });
        group = new Group(id, groupData, me);
        me.groups[id] = group;

        // add items with this groupId to the new group
        for (const itemId in me.items) {
          if (!Object.prototype.hasOwnProperty.call(me.items, itemId)) continue;
          const item = me.items[itemId];
          if (item.data.group == id) group.add(item);
        }
        group.order();
        group.show();
      } else {
        // update group
        group.setData(groupData);
      }
    });
    this.body.emitter.emit("_change", {
      queue: true
    });
  }

  /**
   * Handle removed groups
   * @param {number[]} ids
   * @private
   */
  _onRemoveGroups(ids) {
    _forEachInstanceProperty(ids).call(ids, id => {
      const group = this.groups[id];
      if (group) {
        group.dispose();
        delete this.groups[id];
      }
    });
    if (this.options.cluster) {
      this.clusterGenerator.updateData();
      this._clusterItems();
    }
    this.markDirty({
      restackGroups: !!this.options.cluster
    });
    this.body.emitter.emit("_change", {
      queue: true
    });
  }

  /**
   * Reorder the groups if needed
   * @return {boolean} changed
   * @private
   */
  _orderGroups() {
    if (this.groupsData) {
      // reorder the groups
      let groupIds = this.groupsData.getIds({
        order: this.options.groupOrder
      });
      groupIds = this._orderNestedGroups(groupIds);
      const changed = !availableUtils.equalArray(groupIds, this.groupIds);
      if (changed) {
        // hide all groups, removes them from the DOM
        const groups = this.groups;
        _forEachInstanceProperty(groupIds).call(groupIds, groupId => {
          groups[groupId].hide();
        });

        // show the groups again, attach them to the DOM in correct order
        _forEachInstanceProperty(groupIds).call(groupIds, groupId => {
          groups[groupId].show();
        });
        this.groupIds = groupIds;
      }
      return changed;
    } else {
      return false;
    }
  }

  /**
   * Reorder the nested groups
   *
   * @param {Array.<number>} groupIds
   * @returns {Array.<number>}
   * @private
   */
  _orderNestedGroups(groupIds) {
    /**
     * Recursively order nested groups
     *
     * @param {ItemSet} t
     * @param {Array.<number>} groupIds
     * @returns {Array.<number>}
     * @private
     */
    function getOrderedNestedGroups(t, groupIds) {
      let result = [];
      _forEachInstanceProperty(groupIds).call(groupIds, groupId => {
        result.push(groupId);
        const groupData = t.groupsData.get(groupId);
        if (groupData.nestedGroups) {
          var _context24;
          const nestedGroupIds = _mapInstanceProperty(_context24 = t.groupsData.get({
            filter(nestedGroup) {
              return nestedGroup.nestedInGroup == groupId;
            },
            order: t.options.groupOrder
          })).call(_context24, nestedGroup => nestedGroup.id);
          result = _concatInstanceProperty(result).call(result, getOrderedNestedGroups(t, nestedGroupIds));
        }
      });
      return result;
    }
    const topGroupIds = _filterInstanceProperty(groupIds).call(groupIds, groupId => !this.groupsData.get(groupId).nestedInGroup);
    return getOrderedNestedGroups(this, topGroupIds);
  }

  /**
   * Add a new item
   * @param {Item} item
   * @private
   */
  _addItem(item) {
    this.items[item.id] = item;

    // add to group
    const groupId = this.getGroupId(item.data);
    const group = this.groups[groupId];
    if (!group) {
      item.groupShowing = false;
    } else if (group && group.data && group.data.showNested) {
      item.groupShowing = true;
    }
    if (group) group.add(item);
  }

  /**
   * Update an existing item
   * @param {Item} item
   * @param {Object} itemData
   * @private
   */
  _updateItem(item, itemData) {
    // update the items data (will redraw the item when displayed)
    item.setData(itemData);
    const groupId = this.getGroupId(item.data);
    const group = this.groups[groupId];
    if (!group) {
      item.groupShowing = false;
    } else if (group && group.data && group.data.showNested) {
      item.groupShowing = true;
    }
  }

  /**
   * Delete an item from the ItemSet: remove it from the DOM, from the map
   * with items, and from the map with visible items, and from the selection
   * @param {Item} item
   * @private
   */
  _removeItem(item) {
    var _context25, _context26;
    // remove from DOM
    item.hide();

    // remove from items
    delete this.items[item.id];

    // remove from selection
    const index = _indexOfInstanceProperty(_context25 = this.selection).call(_context25, item.id);
    if (index != -1) _spliceInstanceProperty(_context26 = this.selection).call(_context26, index, 1);

    // remove from group
    item.parent && item.parent.remove(item);

    // remove Tooltip from DOM
    if (this.popup != null) {
      this.popup.hide();
    }
  }

  /**
   * Create an array containing all items being a range (having an end date)
   * @param {Array.<Object>} array
   * @returns {Array}
   * @private
   */
  _constructByEndArray(array) {
    const endArray = [];
    for (let i = 0; i < array.length; i++) {
      if (array[i] instanceof RangeItem) {
        endArray.push(array[i]);
      }
    }
    return endArray;
  }

  /**
   * Register the clicked item on touch, before dragStart is initiated.
   *
   * dragStart is initiated from a mousemove event, AFTER the mouse/touch is
   * already moving. Therefore, the mouse/touch can sometimes be above an other
   * DOM element than the item itself.
   *
   * @param {Event} event
   * @private
   */
  _onTouch(event) {
    // store the touched item, used in _onDragStart
    this.touchParams.item = this.itemFromTarget(event);
    this.touchParams.dragLeftItem = event.target.dragLeftItem || false;
    this.touchParams.dragRightItem = event.target.dragRightItem || false;
    this.touchParams.itemProps = null;
  }

  /**
   * Given an group id, returns the index it has.
   *
   * @param {number} groupId
   * @returns {number} index / groupId
   * @private
   */
  _getGroupIndex(groupId) {
    for (let i = 0; i < this.groupIds.length; i++) {
      if (groupId == this.groupIds[i]) return i;
    }
  }

  /**
   * Start dragging the selected events
   * @param {Event} event
   * @private
   */
  _onDragStart(event) {
    if (this.touchParams.itemIsDragging) {
      return;
    }
    const item = this.touchParams.item || null;
    const me = this;
    let props;
    if (item && (item.selected || this.options.itemsAlwaysDraggable.item)) {
      if (this.options.editable.overrideItems && !this.options.editable.updateTime && !this.options.editable.updateGroup) {
        return;
      }

      // override options.editable
      if (item.editable != null && !item.editable.updateTime && !item.editable.updateGroup && !this.options.editable.overrideItems) {
        return;
      }
      const dragLeftItem = this.touchParams.dragLeftItem;
      const dragRightItem = this.touchParams.dragRightItem;
      this.touchParams.itemIsDragging = true;
      this.touchParams.selectedItem = item;
      if (dragLeftItem) {
        props = {
          item: dragLeftItem,
          initialX: event.center.x,
          dragLeft: true,
          data: this._cloneItemData(item.data)
        };
        this.touchParams.itemProps = [props];
      } else if (dragRightItem) {
        props = {
          item: dragRightItem,
          initialX: event.center.x,
          dragRight: true,
          data: this._cloneItemData(item.data)
        };
        this.touchParams.itemProps = [props];
      } else if (this.options.editable.add && (event.srcEvent.ctrlKey || event.srcEvent.metaKey)) {
        // create a new range item when dragging with ctrl key down
        this._onDragStartAddItem(event);
      } else {
        if (this.groupIds.length < 1) {
          // Mitigates a race condition if _onDragStart() is
          // called after markDirty() without redraw() being called between.
          this.redraw();
        }
        const baseGroupIndex = this._getGroupIndex(item.data.group);
        const itemsToDrag = this.options.itemsAlwaysDraggable.item && !item.selected ? [item.id] : this.getSelection();
        this.touchParams.itemProps = _mapInstanceProperty(itemsToDrag).call(itemsToDrag, id => {
          const item = me.items[id];
          const groupIndex = me._getGroupIndex(item.data.group);
          return {
            item,
            initialX: event.center.x,
            groupOffset: baseGroupIndex - groupIndex,
            data: this._cloneItemData(item.data)
          };
        });
      }
      event.stopPropagation();
    } else if (this.options.editable.add && (event.srcEvent.ctrlKey || event.srcEvent.metaKey)) {
      // create a new range item when dragging with ctrl key down
      this._onDragStartAddItem(event);
    }
  }

  /**
   * Start creating a new range item by dragging.
   * @param {Event} event
   * @private
   */
  _onDragStartAddItem(event) {
    const snap = this.options.snap || null;
    const frameRect = this.dom.frame.getBoundingClientRect();

    // plus (if rtl) 10 to compensate for the drag starting as soon as you've moved 10px
    const x = this.options.rtl ? frameRect.right - event.center.x + 10 : event.center.x - frameRect.left - 10;
    const time = this.body.util.toTime(x);
    const scale = this.body.util.getScale();
    const step = this.body.util.getStep();
    const start = snap ? snap(time, scale, step) : time;
    const end = start;
    const itemData = {
      type: "range",
      start,
      end,
      content: "new item"
    };
    const id = v4();
    itemData[this.itemsData.idProp] = id;
    const group = this.groupFromTarget(event);
    if (group) {
      itemData.group = group.groupId;
    }
    const newItem = new RangeItem(itemData, this.conversion, this.options);
    newItem.id = id; // TODO: not so nice setting id afterwards
    newItem.data = this._cloneItemData(itemData);
    this._addItem(newItem);
    this.touchParams.selectedItem = newItem;
    const props = {
      item: newItem,
      initialX: event.center.x,
      data: newItem.data
    };
    if (this.options.rtl) {
      props.dragLeft = true;
    } else {
      props.dragRight = true;
    }
    this.touchParams.itemProps = [props];
    event.stopPropagation();
  }

  /**
   * Drag selected items
   * @param {Event} event
   * @private
   */
  _onDrag(event) {
    if (this.popup != null && this.options.showTooltips && !this.popup.hidden) {
      // this.popup.hide();
      const container = this.body.dom.centerContainer;
      const containerRect = container.getBoundingClientRect();
      this.popup.setPosition(event.center.x - containerRect.left + container.offsetLeft, event.center.y - containerRect.top + container.offsetTop);
      this.popup.show(); // redraw
    }
    if (this.touchParams.itemProps) {
      var _context27;
      event.stopPropagation();
      const me = this;
      const snap = this.options.snap || null;
      const domRootOffsetLeft = this.body.dom.root.offsetLeft;
      const xOffset = this.options.rtl ? domRootOffsetLeft + this.body.domProps.right.width : domRootOffsetLeft + this.body.domProps.left.width;
      const scale = this.body.util.getScale();
      const step = this.body.util.getStep();

      //only calculate the new group for the item that's actually dragged
      const selectedItem = this.touchParams.selectedItem;
      const updateGroupAllowed = (this.options.editable.overrideItems || selectedItem.editable == null) && this.options.editable.updateGroup || !this.options.editable.overrideItems && selectedItem.editable != null && selectedItem.editable.updateGroup;
      let newGroupBase = null;
      if (updateGroupAllowed && selectedItem) {
        if (selectedItem.data.group != undefined) {
          // drag from one group to another
          const group = me.groupFromTarget(event);
          if (group) {
            //we know the offset for all items, so the new group for all items
            //will be relative to this one.
            newGroupBase = this._getGroupIndex(group.groupId);
          }
        }
      }

      // move
      _forEachInstanceProperty(_context27 = this.touchParams.itemProps).call(_context27, props => {
        const current = me.body.util.toTime(event.center.x - xOffset);
        const initial = me.body.util.toTime(props.initialX - xOffset);
        let offset;
        let initialStart;
        let initialEnd;
        let start;
        let end;
        if (this.options.rtl) {
          offset = -(current - initial); // ms
        } else {
          offset = current - initial; // ms
        }
        let itemData = this._cloneItemData(props.item.data); // clone the data
        if (props.item.editable != null && !props.item.editable.updateTime && !props.item.editable.updateGroup && !me.options.editable.overrideItems) {
          return;
        }
        const updateTimeAllowed = (this.options.editable.overrideItems || selectedItem.editable == null) && this.options.editable.updateTime || !this.options.editable.overrideItems && selectedItem.editable != null && selectedItem.editable.updateTime;
        if (updateTimeAllowed) {
          if (props.dragLeft) {
            // drag left side of a range item
            if (this.options.rtl) {
              if (itemData.end != undefined) {
                initialEnd = availableUtils.convert(props.data.end, "Date");
                end = new Date(initialEnd.valueOf() + offset);
                // TODO: pass a Moment instead of a Date to snap(). (Breaking change)
                itemData.end = snap ? snap(end, scale, step) : end;
              }
            } else {
              if (itemData.start != undefined) {
                initialStart = availableUtils.convert(props.data.start, "Date");
                start = new Date(initialStart.valueOf() + offset);
                // TODO: pass a Moment instead of a Date to snap(). (Breaking change)
                itemData.start = snap ? snap(start, scale, step) : start;
              }
            }
          } else if (props.dragRight) {
            // drag right side of a range item
            if (this.options.rtl) {
              if (itemData.start != undefined) {
                initialStart = availableUtils.convert(props.data.start, "Date");
                start = new Date(initialStart.valueOf() + offset);
                // TODO: pass a Moment instead of a Date to snap(). (Breaking change)
                itemData.start = snap ? snap(start, scale, step) : start;
              }
            } else {
              if (itemData.end != undefined) {
                initialEnd = availableUtils.convert(props.data.end, "Date");
                end = new Date(initialEnd.valueOf() + offset);
                // TODO: pass a Moment instead of a Date to snap(). (Breaking change)
                itemData.end = snap ? snap(end, scale, step) : end;
              }
            }
          } else {
            // drag both start and end
            if (itemData.start != undefined) {
              initialStart = availableUtils.convert(props.data.start, "Date").valueOf();
              start = new Date(initialStart + offset);
              if (itemData.end != undefined) {
                initialEnd = availableUtils.convert(props.data.end, "Date");
                const duration = initialEnd.valueOf() - initialStart.valueOf();

                // TODO: pass a Moment instead of a Date to snap(). (Breaking change)
                itemData.start = snap ? snap(start, scale, step) : start;
                itemData.end = new Date(itemData.start.valueOf() + duration);
              } else {
                // TODO: pass a Moment instead of a Date to snap(). (Breaking change)
                itemData.start = snap ? snap(start, scale, step) : start;
              }
            }
          }
        }
        if (updateGroupAllowed && !props.dragLeft && !props.dragRight && newGroupBase != null) {
          if (itemData.group != undefined) {
            let newOffset = newGroupBase - props.groupOffset;

            //make sure we stay in bounds
            newOffset = Math.max(0, newOffset);
            newOffset = Math.min(me.groupIds.length - 1, newOffset);
            itemData.group = me.groupIds[newOffset];
          }
        }

        // confirm moving the item
        itemData = this._cloneItemData(itemData); // convert start and end to the correct type
        me.options.onMoving(itemData, itemData => {
          if (itemData) {
            props.item.setData(this._cloneItemData(itemData, "Date"));
          }
        });
      });
      this.body.emitter.emit("_change");
    }
  }

  /**
   * Move an item to another group
   * @param {Item} item
   * @param {string | number} groupId
   * @private
   */
  _moveToGroup(item, groupId) {
    const group = this.groups[groupId];
    if (group && group.groupId != item.data.group) {
      const oldGroup = item.parent;
      oldGroup.remove(item);
      oldGroup.order();
      item.data.group = group.groupId;
      group.add(item);
      group.order();
    }
  }

  /**
   * End of dragging selected items
   * @param {Event} event
   * @private
   */
  _onDragEnd(event) {
    this.touchParams.itemIsDragging = false;
    if (this.touchParams.itemProps) {
      event.stopPropagation();
      const me = this;
      const itemProps = this.touchParams.itemProps;
      this.touchParams.itemProps = null;
      _forEachInstanceProperty(itemProps).call(itemProps, props => {
        const id = props.item.id;
        const exists = me.itemsData.get(id) != null;
        if (!exists) {
          // add a new item
          me.options.onAdd(props.item.data, itemData => {
            me._removeItem(props.item); // remove temporary item
            if (itemData) {
              me.itemsData.add(itemData);
            }

            // force re-stacking of all items next redraw
            me.body.emitter.emit("_change");
          });
        } else {
          // update existing item
          const itemData = this._cloneItemData(props.item.data); // convert start and end to the correct type
          me.options.onMove(itemData, itemData => {
            if (itemData) {
              // apply changes
              itemData[this.itemsData.idProp] = id; // ensure the item contains its id (can be undefined)
              this.itemsData.update(itemData);
            } else {
              // restore original values
              props.item.setData(props.data);
              me.body.emitter.emit("_change");
            }
          });
        }
      });
    }
  }

  /**
   * On group click
   * @param {Event} event
   * @private
   */
  _onGroupClick(event) {
    const group = this.groupFromTarget(event);
    _setTimeout(() => {
      this.toggleGroupShowNested(group);
    }, 1);
  }

  /**
   * Toggle show nested
   * @param {object} group
   * @param {boolean} force
   */
  toggleGroupShowNested(group) {
    let force = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : undefined;
    if (!group || !group.nestedGroups) return;
    const groupsData = this.groupsData.getDataSet();
    if (force != undefined) {
      group.showNested = !!force;
    } else {
      group.showNested = !group.showNested;
    }
    let nestingGroup = groupsData.get(group.groupId);
    nestingGroup.showNested = group.showNested;
    let fullNestedGroups = group.nestedGroups;
    let nextLevel = fullNestedGroups;
    while (nextLevel.length > 0) {
      let current = nextLevel;
      nextLevel = [];
      for (let i = 0; i < current.length; i++) {
        let node = groupsData.get(current[i]);
        if (node.nestedGroups) {
          nextLevel = _concatInstanceProperty(nextLevel).call(nextLevel, node.nestedGroups);
        }
      }
      if (nextLevel.length > 0) {
        fullNestedGroups = _concatInstanceProperty(fullNestedGroups).call(fullNestedGroups, nextLevel);
      }
    }
    var nestedGroups;
    if (nestingGroup.showNested) {
      var showNestedGroups = groupsData.get(nestingGroup.nestedGroups);
      for (let i = 0; i < showNestedGroups.length; i++) {
        let group = showNestedGroups[i];
        if (group.nestedGroups && group.nestedGroups.length > 0 && (group.showNested == undefined || group.showNested == true)) {
          showNestedGroups.push(...groupsData.get(group.nestedGroups));
        }
      }
      nestedGroups = _mapInstanceProperty(showNestedGroups).call(showNestedGroups, function (nestedGroup) {
        if (nestedGroup.visible == undefined) {
          nestedGroup.visible = true;
        }
        nestedGroup.visible = !!nestingGroup.showNested;
        return nestedGroup;
      });
    } else {
      var _context28;
      nestedGroups = _mapInstanceProperty(_context28 = groupsData.get(fullNestedGroups)).call(_context28, function (nestedGroup) {
        if (nestedGroup.visible == undefined) {
          nestedGroup.visible = true;
        }
        nestedGroup.visible = !!nestingGroup.showNested;
        return nestedGroup;
      });
    }
    groupsData.update(_concatInstanceProperty(nestedGroups).call(nestedGroups, nestingGroup));
    if (nestingGroup.showNested) {
      availableUtils.removeClassName(group.dom.label, "collapsed");
      availableUtils.addClassName(group.dom.label, "expanded");
    } else {
      availableUtils.removeClassName(group.dom.label, "expanded");
      availableUtils.addClassName(group.dom.label, "collapsed");
    }
  }

  /**
   * Toggle group drag classname
   * @param {object} group
   */
  toggleGroupDragClassName(group) {
    group.dom.label.classList.toggle("vis-group-is-dragging");
    group.dom.foreground.classList.toggle("vis-group-is-dragging");
  }

  /**
   * on drag start
   * @param {Event} event
   * @return {void}
   * @private
   */
  _onGroupDragStart(event) {
    if (this.groupTouchParams.isDragging) return;
    if (this.options.groupEditable.order) {
      this.groupTouchParams.group = this.groupFromTarget(event);
      if (this.groupTouchParams.group) {
        event.stopPropagation();
        this.groupTouchParams.isDragging = true;
        this.toggleGroupDragClassName(this.groupTouchParams.group);
        this.groupTouchParams.originalOrder = this.groupsData.getIds({
          order: this.options.groupOrder
        });
      }
    }
  }

  /**
   * on drag
   * @param {Event} event
   * @return {void}
   * @private
   */
  _onGroupDrag(event) {
    if (this.options.groupEditable.order && this.groupTouchParams.group) {
      event.stopPropagation();
      const groupsData = this.groupsData.getDataSet();
      // drag from one group to another
      const group = this.groupFromTarget(event);

      // try to avoid toggling when groups differ in height
      if (group && group.height != this.groupTouchParams.group.height) {
        const movingUp = group.top < this.groupTouchParams.group.top;
        const clientY = event.center ? event.center.y : event.clientY;
        const targetGroup = group.dom.foreground.getBoundingClientRect();
        const draggedGroupHeight = this.groupTouchParams.group.height;
        if (movingUp) {
          // skip swapping the groups when the dragged group is not below clientY afterwards
          if (targetGroup.top + draggedGroupHeight < clientY) {
            return;
          }
        } else {
          const targetGroupHeight = group.height;
          // skip swapping the groups when the dragged group is not below clientY afterwards
          if (targetGroup.top + targetGroupHeight - draggedGroupHeight > clientY) {
            return;
          }
        }
      }
      if (group && group != this.groupTouchParams.group) {
        const targetGroup = groupsData.get(group.groupId);
        const draggedGroup = groupsData.get(this.groupTouchParams.group.groupId);

        // switch groups
        if (draggedGroup && targetGroup) {
          this.options.groupOrderSwap(draggedGroup, targetGroup, groupsData);
          groupsData.update(draggedGroup);
          groupsData.update(targetGroup);
        }

        // fetch current order of groups
        const newOrder = groupsData.getIds({
          order: this.options.groupOrder
        });

        // in case of changes since _onGroupDragStart
        if (!availableUtils.equalArray(newOrder, this.groupTouchParams.originalOrder)) {
          const origOrder = this.groupTouchParams.originalOrder;
          const draggedId = this.groupTouchParams.group.groupId;
          const numGroups = Math.min(origOrder.length, newOrder.length);
          let curPos = 0;
          let newOffset = 0;
          let orgOffset = 0;
          while (curPos < numGroups) {
            // as long as the groups are where they should be step down along the groups order
            while (curPos + newOffset < numGroups && curPos + orgOffset < numGroups && newOrder[curPos + newOffset] == origOrder[curPos + orgOffset]) {
              curPos++;
            }

            // all ok
            if (curPos + newOffset >= numGroups) {
              break;
            }

            // not all ok
            // if dragged group was move upwards everything below should have an offset
            if (newOrder[curPos + newOffset] == draggedId) {
              newOffset = 1;
            }
            // if dragged group was move downwards everything above should have an offset
            else if (origOrder[curPos + orgOffset] == draggedId) {
              orgOffset = 1;
            }
            // found a group (apart from dragged group) that has the wrong position -> switch with the
            // group at the position where other one should be, fix index arrays and continue
            else {
              const slippedPosition = _indexOfInstanceProperty(newOrder).call(newOrder, origOrder[curPos + orgOffset]);
              const switchGroup = groupsData.get(newOrder[curPos + newOffset]);
              const shouldBeGroup = groupsData.get(origOrder[curPos + orgOffset]);
              this.options.groupOrderSwap(switchGroup, shouldBeGroup, groupsData);
              groupsData.update(switchGroup);
              groupsData.update(shouldBeGroup);
              const switchGroupId = newOrder[curPos + newOffset];
              newOrder[curPos + newOffset] = origOrder[curPos + orgOffset];
              newOrder[slippedPosition] = switchGroupId;
              curPos++;
            }
          }
        }
      }
    }
  }

  /**
   * on drag end
   * @param {Event} event
   * @return {void}
   * @private
   */
  _onGroupDragEnd(event) {
    this.groupTouchParams.isDragging = false;
    if (this.options.groupEditable.order && this.groupTouchParams.group) {
      event.stopPropagation();

      // update existing group
      const me = this;
      const id = me.groupTouchParams.group.groupId;
      const dataset = me.groupsData.getDataSet();
      const groupData = availableUtils.extend({}, dataset.get(id)); // clone the data
      me.options.onMoveGroup(groupData, groupData => {
        if (groupData) {
          // apply changes
          groupData[dataset._idProp] = id; // ensure the group contains its id (can be undefined)
          dataset.update(groupData);
        } else {
          // fetch current order of groups
          const newOrder = dataset.getIds({
            order: me.options.groupOrder
          });

          // restore original order
          if (!availableUtils.equalArray(newOrder, me.groupTouchParams.originalOrder)) {
            const origOrder = me.groupTouchParams.originalOrder;
            const numGroups = Math.min(origOrder.length, newOrder.length);
            let curPos = 0;
            while (curPos < numGroups) {
              // as long as the groups are where they should be step down along the groups order
              while (curPos < numGroups && newOrder[curPos] == origOrder[curPos]) {
                curPos++;
              }

              // all ok
              if (curPos >= numGroups) {
                break;
              }

              // found a group that has the wrong position -> switch with the
              // group at the position where other one should be, fix index arrays and continue
              const slippedPosition = _indexOfInstanceProperty(newOrder).call(newOrder, origOrder[curPos]);
              const switchGroup = dataset.get(newOrder[curPos]);
              const shouldBeGroup = dataset.get(origOrder[curPos]);
              me.options.groupOrderSwap(switchGroup, shouldBeGroup, dataset);
              dataset.update(switchGroup);
              dataset.update(shouldBeGroup);
              const switchGroupId = newOrder[curPos];
              newOrder[curPos] = origOrder[curPos];
              newOrder[slippedPosition] = switchGroupId;
              curPos++;
            }
          }
        }
      });
      me.body.emitter.emit("groupDragged", {
        groupId: id
      });
      this.toggleGroupDragClassName(this.groupTouchParams.group);
      this.groupTouchParams.group = null;
    }
  }

  /**
   * Handle selecting/deselecting an item when tapping it
   * @param {Event} event
   * @private
   */
  _onSelectItem(event) {
    if (!this.options.selectable) return;
    const ctrlKey = event.srcEvent && (event.srcEvent.ctrlKey || event.srcEvent.metaKey);
    const shiftKey = event.srcEvent && event.srcEvent.shiftKey;
    if (ctrlKey || shiftKey) {
      this._onMultiSelectItem(event);
      return;
    }
    const oldSelection = this.getSelection();
    const item = this.itemFromTarget(event);
    const selection = item && item.selectable ? [item.id] : [];
    this.setSelection(selection);
    const newSelection = this.getSelection();

    // emit a select event,
    // except when old selection is empty and new selection is still empty
    if (newSelection.length > 0 || oldSelection.length > 0) {
      this.body.emitter.emit("select", {
        items: newSelection,
        event
      });
    }
  }

  /**
   * Handle hovering an item
   * @param {Event} event
   * @private
   */
  _onMouseOver(event) {
    const item = this.itemFromTarget(event);
    if (!item) return;

    // Item we just left
    const related = this.itemFromRelatedTarget(event);
    if (item === related) {
      // We haven't changed item, just element in the item
      return;
    }
    const title = item.getTitle();
    if (this.options.showTooltips && title) {
      if (this.popup == null) {
        this.popup = new Popup(this.body.dom.root, this.options.tooltip.overflowMethod || "flip");
      }
      this.popup.setText(title);
      const container = this.body.dom.centerContainer;
      const containerRect = container.getBoundingClientRect();
      this.popup.setPosition(event.clientX - containerRect.left + container.offsetLeft, event.clientY - containerRect.top + container.offsetTop);
      this.setPopupTimer(this.popup);
    } else {
      // Hovering over item without a title, hide popup
      // Needed instead of _just_ in _onMouseOut due to #2572
      this.clearPopupTimer();
      if (this.popup != null) {
        this.popup.hide();
      }
    }
    this.body.emitter.emit("itemover", {
      item: item.id,
      event
    });
  }

  /**
   * on mouse start
   * @param {Event} event
   * @return {void}
   * @private
   */
  _onMouseOut(event) {
    const item = this.itemFromTarget(event);
    if (!item) return;

    // Item we are going to
    const related = this.itemFromRelatedTarget(event);
    if (item === related) {
      // We aren't changing item, just element in the item
      return;
    }
    this.clearPopupTimer();
    if (this.popup != null) {
      this.popup.hide();
    }
    this.body.emitter.emit("itemout", {
      item: item.id,
      event
    });
  }

  /**
   * on mouse move
   * @param {Event} event
   * @return {void}
   * @private
   */
  _onMouseMove(event) {
    const item = this.itemFromTarget(event);
    if (!item) return;
    if (this.popupTimer != null) {
      // restart timer
      this.setPopupTimer(this.popup);
    }
    if (this.options.showTooltips && this.options.tooltip.followMouse && this.popup && !this.popup.hidden) {
      const container = this.body.dom.centerContainer;
      const containerRect = container.getBoundingClientRect();
      this.popup.setPosition(event.clientX - containerRect.left + container.offsetLeft, event.clientY - containerRect.top + container.offsetTop);
      this.popup.show(); // Redraw
    }
  }

  /**
   * Handle mousewheel
   * @param {Event}  event   The event
   * @private
   */
  _onMouseWheel(event) {
    if (this.touchParams.itemIsDragging) {
      this._onDragEnd(event);
    }
  }

  /**
   * Handle updates of an item on double tap
   * @param {timeline.Item}  item   The item
   * @private
   */
  _onUpdateItem(item) {
    if (!this.options.selectable) return;
    if (!this.options.editable.updateTime && !this.options.editable.updateGroup) return;
    const me = this;
    if (item) {
      // execute async handler to update the item (or cancel it)
      const itemData = me.itemsData.get(item.id); // get a clone of the data from the dataset
      this.options.onUpdate(itemData, itemData => {
        if (itemData) {
          me.itemsData.update(itemData);
        }
      });
    }
  }

  /**
   * Handle drop event of data on item
   * Only called when `objectData.target === 'item'.
   * @param {Event} event The event
   * @private
   */
  _onDropObjectOnItem(event) {
    const item = this.itemFromTarget(event);
    const objectData = JSON.parse(event.dataTransfer.getData("text"));
    this.options.onDropObjectOnItem(objectData, item);
  }

  /**
   * Handle creation of an item on double tap or drop of a drag event
   * @param {Event} event   The event
   * @private
   */
  _onAddItem(event) {
    if (!this.options.selectable) return;
    if (!this.options.editable.add) return;
    const me = this;
    const snap = this.options.snap || null;

    // add item
    const frameRect = this.dom.frame.getBoundingClientRect();
    const x = this.options.rtl ? frameRect.right - event.center.x : event.center.x - frameRect.left;
    const start = this.body.util.toTime(x);
    const scale = this.body.util.getScale();
    const step = this.body.util.getStep();
    let end;
    let newItemData;
    if (event.type == "drop") {
      newItemData = JSON.parse(event.dataTransfer.getData("text"));
      newItemData.content = newItemData.content ? newItemData.content : "new item";
      newItemData.start = newItemData.start ? newItemData.start : snap ? snap(start, scale, step) : start;
      newItemData.type = newItemData.type || "box";
      newItemData[this.itemsData.idProp] = newItemData.id || v4();
      if (newItemData.type == "range" && !newItemData.end) {
        end = this.body.util.toTime(x + this.props.width / 5);
        newItemData.end = snap ? snap(end, scale, step) : end;
      }
    } else {
      newItemData = {
        start: snap ? snap(start, scale, step) : start,
        content: "new item"
      };
      newItemData[this.itemsData.idProp] = v4();

      // when default type is a range, add a default end date to the new item
      if (this.options.type === "range") {
        end = this.body.util.toTime(x + this.props.width / 5);
        newItemData.end = snap ? snap(end, scale, step) : end;
      }
    }
    const group = this.groupFromTarget(event);
    if (group) {
      newItemData.group = group.groupId;
    }

    // execute async handler to customize (or cancel) adding an item
    newItemData = this._cloneItemData(newItemData); // convert start and end to the correct type
    this.options.onAdd(newItemData, item => {
      if (item) {
        me.itemsData.add(item);
        if (event.type == "drop") {
          me.setSelection([item.id]);
        }
        // TODO: need to trigger a redraw?
      }
    });
  }

  /**
   * Handle selecting/deselecting multiple items when holding an item
   * @param {Event} event
   * @private
   */
  _onMultiSelectItem(event) {
    if (!this.options.selectable) return;
    const item = this.itemFromTarget(event);
    if (item) {
      // multi select items (if allowed)

      let selection = this.options.multiselect ? this.getSelection() // take current selection
      : []; // deselect current selection

      const shiftKey = event.srcEvent && event.srcEvent.shiftKey || false;
      if ((shiftKey || this.options.sequentialSelection) && this.options.multiselect) {
        // select all items between the old selection and the tapped item
        const itemGroup = this.itemsData.get(item.id).group;

        // when filtering get the group of the last selected item
        let lastSelectedGroup = undefined;
        if (this.options.multiselectPerGroup) {
          if (selection.length > 0) {
            lastSelectedGroup = this.itemsData.get(selection[0]).group;
          }
        }

        // determine the selection range
        if (!this.options.multiselectPerGroup || lastSelectedGroup == undefined || lastSelectedGroup == itemGroup) {
          selection.push(item.id);
        }
        const range = ItemSet._getItemRange(this.itemsData.get(selection));
        if (!this.options.multiselectPerGroup || lastSelectedGroup == itemGroup) {
          // select all items within the selection range
          selection = [];
          for (const id in this.items) {
            if (!Object.prototype.hasOwnProperty.call(this.items, id)) continue;
            const _item = this.items[id];
            const start = _item.data.start;
            const end = _item.data.end !== undefined ? _item.data.end : start;
            if (start >= range.min && end <= range.max && (!this.options.multiselectPerGroup || lastSelectedGroup == this.itemsData.get(_item.id).group) && !(_item instanceof BackgroundItem)) {
              selection.push(_item.id); // do not use id but item.id, id itself is stringified
            }
          }
        }
      } else {
        // add/remove this item from the current selection
        const index = _indexOfInstanceProperty(selection).call(selection, item.id);
        if (index == -1) {
          // item is not yet selected -> select it
          selection.push(item.id);
        } else {
          // item is already selected -> deselect it
          _spliceInstanceProperty(selection).call(selection, index, 1);
        }
      }
      const filteredSelection = _filterInstanceProperty(selection).call(selection, item => this.getItemById(item).selectable);
      this.setSelection(filteredSelection);
      this.body.emitter.emit("select", {
        items: this.getSelection(),
        event
      });
    }
  }

  /**
   * Calculate the time range of a list of items
   * @param {Array.<Object>} itemsData
   * @return {{min: Date, max: Date}} Returns the range of the provided items
   * @private
   */
  static _getItemRange(itemsData) {
    let max = null;
    let min = null;
    _forEachInstanceProperty(itemsData).call(itemsData, data => {
      if (min == null || data.start < min) {
        min = data.start;
      }
      if (data.end != undefined) {
        if (max == null || data.end > max) {
          max = data.end;
        }
      } else {
        if (max == null || data.start > max) {
          max = data.start;
        }
      }
    });
    return {
      min,
      max
    };
  }

  /**
   * Find an item from an element:
   * searches for the attribute 'vis-item' in the element's tree
   * @param {HTMLElement} element
   * @return {Item | null} item
   */
  itemFromElement(element) {
    let cur = element;
    while (cur) {
      if (Object.prototype.hasOwnProperty.call(cur, "vis-item")) {
        return cur["vis-item"];
      }
      cur = cur.parentNode;
    }
    return null;
  }

  /**
   * Find an item from an event target:
   * searches for the attribute 'vis-item' in the event target's element tree
   * @param {Event} event
   * @return {Item | null} item
   */
  itemFromTarget(event) {
    return this.itemFromElement(event.target);
  }

  /**
   * Find an item from an event's related target:
   * searches for the attribute 'vis-item' in the related target's element tree
   * @param {Event} event
   * @return {Item | null} item
   */
  itemFromRelatedTarget(event) {
    return this.itemFromElement(event.relatedTarget);
  }

  /**
   * Find the Group from an event target:
   * searches for the attribute 'vis-group' in the event target's element tree
   * @param {Event} event
   * @return {Group | null} group
   */
  groupFromTarget(event) {
    const clientY = event.center ? event.center.y : event.clientY;
    let groupIds = this.groupIds;
    if (groupIds.length <= 0 && this.groupsData) {
      groupIds = this.groupsData.getIds({
        order: this.options.groupOrder
      });
    }
    for (let i = 0; i < groupIds.length; i++) {
      const groupId = groupIds[i];
      const group = this.groups[groupId];
      const foreground = group.dom.foreground;
      const foregroundRect = foreground.getBoundingClientRect();
      if (clientY >= foregroundRect.top && clientY < foregroundRect.top + foreground.offsetHeight) {
        return group;
      }
      if (this.options.orientation.item === "top") {
        if (i === this.groupIds.length - 1 && clientY > foregroundRect.top) {
          return group;
        }
      } else {
        if (i === 0 && clientY < foregroundRect.top + foreground.offset) {
          return group;
        }
      }
    }
    return null;
  }

  /**
   * Find the ItemSet from an event target:
   * searches for the attribute 'vis-itemset' in the event target's element tree
   * @param {Event} event
   * @return {ItemSet | null} item
   */
  static itemSetFromTarget(event) {
    let target = event.target;
    while (target) {
      if (Object.prototype.hasOwnProperty.call(target, "vis-itemset")) {
        return target["vis-itemset"];
      }
      target = target.parentNode;
    }
    return null;
  }

  /**
   * Clone the data of an item, and "normalize" it: convert the start and end date
   * to the type (Date, Moment, ...) configured in the DataSet. If not configured,
   * start and end are converted to Date.
   * @param {Object} itemData, typically `item.data`
   * @param {string} [type]  Optional Date type. If not provided, the type from the DataSet is taken
   * @return {Object} The cloned object
   * @private
   */
  _cloneItemData(itemData, type) {
    const clone = availableUtils.extend({}, itemData);
    if (!type) {
      // convert start and end date to the type (Date, Moment, ...) configured in the DataSet
      type = this.itemsData.type;
    }
    if (clone.start != undefined) {
      clone.start = availableUtils.convert(clone.start, type && type.start || "Date");
    }
    if (clone.end != undefined) {
      clone.end = availableUtils.convert(clone.end, type && type.end || "Date");
    }
    return clone;
  }

  /**
   * cluster items
   * @return {void}
   * @private
   */
  _clusterItems() {
    if (!this.options.cluster) {
      return;
    }
    const {
      scale
    } = this.body.range.conversion(this.body.domProps.center.width);
    const clusters = this.clusterGenerator.getClusters(this.clusters, scale, this.options.cluster);
    if (this.clusters != clusters) {
      this._detachAllClusters();
      if (clusters) {
        for (let cluster of clusters) {
          cluster.attach();
        }
        this.clusters = clusters;
      }
      this._updateClusters(clusters);
    }
  }

  /**
   * detach all cluster items
   * @private
   */
  _detachAllClusters() {
    if (this.options.cluster) {
      if (this.clusters && this.clusters.length) {
        for (let cluster of this.clusters) {
          cluster.detach();
        }
      }
    }
  }

  /**
   * update clusters
   * @param {array} clusters
   * @private
   */
  _updateClusters(clusters) {
    if (this.clusters && this.clusters.length) {
      var _context29;
      const newClustersIds = new _Set(_mapInstanceProperty(clusters).call(clusters, cluster => cluster.id));
      const clustersToUnselect = _filterInstanceProperty(_context29 = this.clusters).call(_context29, cluster => !newClustersIds.has(cluster.id));
      let selectionChanged = false;
      for (let cluster of clustersToUnselect) {
        var _context30;
        const selectedIdx = _indexOfInstanceProperty(_context30 = this.selection).call(_context30, cluster.id);
        if (selectedIdx !== -1) {
          var _context31;
          cluster.unselect();
          _spliceInstanceProperty(_context31 = this.selection).call(_context31, selectedIdx, 1);
          selectionChanged = true;
        }
      }
      if (selectionChanged) {
        const newSelection = this.getSelection();
        this.body.emitter.emit("select", {
          items: newSelection,
          event: event
        });
      }
    }
    this.clusters = clusters || [];
  }
}

// available item types will be registered here
ItemSet.types = {
  background: BackgroundItem,
  box: BoxItem,
  range: RangeItem,
  point: PointItem
};

/**
 * Handle added items
 * @param {number[]} ids
 * @protected
 */
ItemSet.prototype._onAdd = ItemSet.prototype._onUpdate;

let errorFound = false;
let allOptions$2;
let printStyle = "background: #FFeeee; color: #dd0000";
/**
 *  Used to validate options.
 */
class Validator {
  /**
   * @ignore
   */
  constructor() {}

  /**
   * Main function to be called
   * @param {Object} options
   * @param {Object} referenceOptions
   * @param {Object} subObject
   * @returns {boolean}
   * @static
   */
  static validate(options, referenceOptions, subObject) {
    errorFound = false;
    allOptions$2 = referenceOptions;
    let usedOptions = referenceOptions;
    if (subObject !== undefined) {
      usedOptions = referenceOptions[subObject];
    }
    Validator.parse(options, usedOptions, []);
    return errorFound;
  }

  /**
   * Will traverse an object recursively and check every value
   * @param {Object} options
   * @param {Object} referenceOptions
   * @param {array} path    | where to look for the actual option
   * @static
   */
  static parse(options, referenceOptions, path) {
    for (let option in options) {
      if (!Object.prototype.hasOwnProperty.call(options, option)) continue;
      Validator.check(option, options, referenceOptions, path);
    }
  }

  /**
   * Check every value. If the value is an object, call the parse function on that object.
   * @param {string} option
   * @param {Object} options
   * @param {Object} referenceOptions
   * @param {array} path    | where to look for the actual option
   * @static
   */
  static check(option, options, referenceOptions, path) {
    if (referenceOptions[option] === undefined && referenceOptions.__any__ === undefined) {
      Validator.getSuggestion(option, referenceOptions, path);
      return;
    }
    let referenceOption = option;
    let is_object = true;
    if (referenceOptions[option] === undefined && referenceOptions.__any__ !== undefined) {
      // NOTE: This only triggers if the __any__ is in the top level of the options object.
      //       THAT'S A REALLY BAD PLACE TO ALLOW IT!!!!
      // TODO: Examine if needed, remove if possible

      // __any__ is a wildcard. Any value is accepted and will be further analysed by reference.
      referenceOption = "__any__";

      // if the any-subgroup is not a predefined object in the configurator,
      // we do not look deeper into the object.
      is_object = Validator.getType(options[option]) === "object";
    }
    let refOptionObj = referenceOptions[referenceOption];
    if (is_object && refOptionObj.__type__ !== undefined) {
      refOptionObj = refOptionObj.__type__;
    }
    Validator.checkFields(option, options, referenceOptions, referenceOption, refOptionObj, path);
  }

  /**
   *
   * @param {string}  option           | the option property
   * @param {Object}  options          | The supplied options object
   * @param {Object}  referenceOptions | The reference options containing all options and their allowed formats
   * @param {string}  referenceOption  | Usually this is the same as option, except when handling an __any__ tag.
   * @param {string}  refOptionObj     | This is the type object from the reference options
   * @param {Array}   path             | where in the object is the option
   * @static
   */
  static checkFields(option, options, referenceOptions, referenceOption, refOptionObj, path) {
    let log = function (message) {
      console.log("%c" + message + Validator.printLocation(path, option), printStyle);
    };
    let optionType = Validator.getType(options[option]);
    let refOptionType = refOptionObj[optionType];
    if (refOptionType !== undefined) {
      // if the type is correct, we check if it is supposed to be one of a few select values
      if (Validator.getType(refOptionType) === "array" && _indexOfInstanceProperty(refOptionType).call(refOptionType, options[option]) === -1) {
        log('Invalid option detected in "' + option + '".' + " Allowed values are:" + Validator.print(refOptionType) + ' not "' + options[option] + '". ');
        errorFound = true;
      } else if (optionType === "object" && referenceOption !== "__any__") {
        path = availableUtils.copyAndExtendArray(path, option);
        Validator.parse(options[option], referenceOptions[referenceOption], path);
      }
    } else if (refOptionObj["any"] === undefined) {
      // type of the field is incorrect and the field cannot be any
      log('Invalid type received for "' + option + '". Expected: ' + Validator.print(_Object$keys(refOptionObj)) + ". Received [" + optionType + '] "' + options[option] + '"');
      errorFound = true;
    }
  }

  /**
   *
   * @param {Object|boolean|number|string|Array.<number>|Date|Node|Moment|undefined|null} object
   * @returns {string}
   * @static
   */
  static getType(object) {
    var type = typeof object;
    if (type === "object") {
      if (object === null) {
        return "null";
      }
      if (object instanceof Boolean) {
        return "boolean";
      }
      if (object instanceof Number) {
        return "number";
      }
      if (object instanceof String) {
        return "string";
      }
      if (_Array$isArray(object)) {
        return "array";
      }
      if (object instanceof Date) {
        return "date";
      }
      if (object.nodeType !== undefined) {
        return "dom";
      }
      if (object._isAMomentObject === true) {
        return "moment";
      }
      return "object";
    } else if (type === "number") {
      return "number";
    } else if (type === "boolean") {
      return "boolean";
    } else if (type === "string") {
      return "string";
    } else if (type === undefined) {
      return "undefined";
    }
    return type;
  }

  /**
   * @param {string} option
   * @param {Object} options
   * @param {Array.<string>} path
   * @static
   */
  static getSuggestion(option, options, path) {
    let localSearch = Validator.findInOptions(option, options, path, false);
    let globalSearch = Validator.findInOptions(option, allOptions$2, [], true);
    let localSearchThreshold = 8;
    let globalSearchThreshold = 4;
    let msg;
    if (localSearch.indexMatch !== undefined) {
      msg = " in " + Validator.printLocation(localSearch.path, option, "") + 'Perhaps it was incomplete? Did you mean: "' + localSearch.indexMatch + '"?\n\n';
    } else if (globalSearch.distance <= globalSearchThreshold && localSearch.distance > globalSearch.distance) {
      msg = " in " + Validator.printLocation(localSearch.path, option, "") + "Perhaps it was misplaced? Matching option found at: " + Validator.printLocation(globalSearch.path, globalSearch.closestMatch, "");
    } else if (localSearch.distance <= localSearchThreshold) {
      msg = '. Did you mean "' + localSearch.closestMatch + '"?' + Validator.printLocation(localSearch.path, option);
    } else {
      msg = ". Did you mean one of these: " + Validator.print(_Object$keys(options)) + Validator.printLocation(path, option);
    }
    console.log('%cUnknown option detected: "' + option + '"' + msg, printStyle);
    errorFound = true;
  }

  /**
   * traverse the options in search for a match.
   * @param {string} option
   * @param {Object} options
   * @param {Array} path    | where to look for the actual option
   * @param {boolean} [recursive=false]
   * @returns {{closestMatch: string, path: Array, distance: number}}
   * @static
   */
  static findInOptions(option, options, path) {
    let recursive = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : false;
    let min = 1e9;
    let closestMatch = "";
    let closestMatchPath = [];
    let lowerCaseOption = option.toLowerCase();
    let indexMatch = undefined;
    for (let op in options) {
      if (!Object.prototype.hasOwnProperty.call(options, op)) continue;
      let distance;
      if (options[op].__type__ !== undefined && recursive === true) {
        let result = Validator.findInOptions(option, options[op], availableUtils.copyAndExtendArray(path, op));
        if (min > result.distance) {
          closestMatch = result.closestMatch;
          closestMatchPath = result.path;
          min = result.distance;
          indexMatch = result.indexMatch;
        }
      } else {
        var _context;
        if (_indexOfInstanceProperty(_context = op.toLowerCase()).call(_context, lowerCaseOption) !== -1) {
          indexMatch = op;
        }
        distance = Validator.levenshteinDistance(option, op);
        if (min > distance) {
          closestMatch = op;
          closestMatchPath = availableUtils.copyArray(path);
          min = distance;
        }
      }
    }
    return {
      closestMatch: closestMatch,
      path: closestMatchPath,
      distance: min,
      indexMatch: indexMatch
    };
  }

  /**
   * @param {Array.<string>} path
   * @param {Object} option
   * @param {string} prefix
   * @returns {String}
   * @static
   */
  static printLocation(path, option) {
    let prefix = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : "Problem value found at: \n";
    let str = "\n\n" + prefix + "options = {\n";
    for (let i = 0; i < path.length; i++) {
      for (let j = 0; j < i + 1; j++) {
        str += "  ";
      }
      str += path[i] + ": {\n";
    }
    for (let j = 0; j < path.length + 1; j++) {
      str += "  ";
    }
    str += option + "\n";
    for (let i = 0; i < path.length + 1; i++) {
      for (let j = 0; j < path.length - i; j++) {
        str += "  ";
      }
      str += "}\n";
    }
    return str + "\n\n";
  }

  /**
   * @param {Object} options
   * @returns {String}
   * @static
   */
  static print(options) {
    return _JSON$stringify(options).replace(/(\")|(\[)|(\])|(,"__type__")/g, "").replace(/(\,)/g, ", ");
  }

  /**
   *  Compute the edit distance between the two given strings
   * http://en.wikibooks.org/wiki/Algorithm_Implementation/Strings/Levenshtein_distance#JavaScript
   *
   * Copyright (c) 2011 Andrei Mackenzie
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
   *
   * @param {string} a
   * @param {string} b
   * @returns {Array.<Array.<number>>}}
   * @static
   */
  static levenshteinDistance(a, b) {
    if (a.length === 0) return b.length;
    if (b.length === 0) return a.length;
    var matrix = [];

    // increment along the first column of each row
    var i;
    for (i = 0; i <= b.length; i++) {
      matrix[i] = [i];
    }

    // increment each column in the first row
    var j;
    for (j = 0; j <= a.length; j++) {
      matrix[0][j] = j;
    }

    // Fill in the rest of the matrix
    for (i = 1; i <= b.length; i++) {
      for (j = 1; j <= a.length; j++) {
        if (b.charAt(i - 1) == a.charAt(j - 1)) {
          matrix[i][j] = matrix[i - 1][j - 1];
        } else {
          matrix[i][j] = Math.min(matrix[i - 1][j - 1] + 1,
          // substitution
          Math.min(matrix[i][j - 1] + 1,
          // insertion
          matrix[i - 1][j] + 1)); // deletion
        }
      }
    }
    return matrix[b.length][a.length];
  }
}

/**
 * This object contains all possible options. It will check if the types are correct, if required if the option is one
 * of the allowed values.
 *
 * __any__ means that the name of the property does not matter.
 * __type__ is a required field for all objects and contains the allowed types of all objects
 */
let string$1 = "string";
let bool$1 = "boolean";
let number$1 = "number";
let array$1 = "array";
let date$1 = "date";
let object$1 = "object"; // should only be in a __type__ property
let dom$1 = "dom";
let moment$1 = "moment";
let any$1 = "any";
let allOptions$1 = {
  configure: {
    enabled: {
      boolean: bool$1
    },
    filter: {
      boolean: bool$1,
      function: "function"
    },
    container: {
      dom: dom$1
    },
    __type__: {
      object: object$1,
      boolean: bool$1,
      function: "function"
    }
  },
  //globals :
  align: {
    string: string$1
  },
  alignCurrentTime: {
    string: string$1,
    undefined: "undefined"
  },
  rtl: {
    boolean: bool$1,
    undefined: "undefined"
  },
  rollingMode: {
    follow: {
      boolean: bool$1
    },
    offset: {
      number: number$1,
      undefined: "undefined"
    },
    __type__: {
      object: object$1
    }
  },
  onTimeout: {
    timeoutMs: {
      number: number$1
    },
    callback: {
      function: "function"
    },
    __type__: {
      object: object$1
    }
  },
  verticalScroll: {
    boolean: bool$1,
    undefined: "undefined"
  },
  horizontalScroll: {
    boolean: bool$1,
    undefined: "undefined"
  },
  horizontalScrollKey: {
    string: string$1,
    undefined: "undefined"
  },
  horizontalScrollInvert: {
    boolean: bool$1,
    undefined: "undefined"
  },
  autoResize: {
    boolean: bool$1
  },
  throttleRedraw: {
    number: number$1
  },
  // TODO: DEPRICATED see https://github.com/almende/vis/issues/2511
  clickToUse: {
    boolean: bool$1
  },
  dataAttributes: {
    string: string$1,
    array: array$1
  },
  editable: {
    add: {
      boolean: bool$1,
      undefined: "undefined"
    },
    remove: {
      boolean: bool$1,
      undefined: "undefined"
    },
    updateGroup: {
      boolean: bool$1,
      undefined: "undefined"
    },
    updateTime: {
      boolean: bool$1,
      undefined: "undefined"
    },
    overrideItems: {
      boolean: bool$1,
      undefined: "undefined"
    },
    __type__: {
      boolean: bool$1,
      object: object$1
    }
  },
  end: {
    number: number$1,
    date: date$1,
    string: string$1,
    moment: moment$1
  },
  format: {
    minorLabels: {
      millisecond: {
        string: string$1,
        undefined: "undefined"
      },
      second: {
        string: string$1,
        undefined: "undefined"
      },
      minute: {
        string: string$1,
        undefined: "undefined"
      },
      hour: {
        string: string$1,
        undefined: "undefined"
      },
      weekday: {
        string: string$1,
        undefined: "undefined"
      },
      day: {
        string: string$1,
        undefined: "undefined"
      },
      week: {
        string: string$1,
        undefined: "undefined"
      },
      month: {
        string: string$1,
        undefined: "undefined"
      },
      year: {
        string: string$1,
        undefined: "undefined"
      },
      __type__: {
        object: object$1,
        function: "function"
      }
    },
    majorLabels: {
      millisecond: {
        string: string$1,
        undefined: "undefined"
      },
      second: {
        string: string$1,
        undefined: "undefined"
      },
      minute: {
        string: string$1,
        undefined: "undefined"
      },
      hour: {
        string: string$1,
        undefined: "undefined"
      },
      weekday: {
        string: string$1,
        undefined: "undefined"
      },
      day: {
        string: string$1,
        undefined: "undefined"
      },
      week: {
        string: string$1,
        undefined: "undefined"
      },
      month: {
        string: string$1,
        undefined: "undefined"
      },
      year: {
        string: string$1,
        undefined: "undefined"
      },
      __type__: {
        object: object$1,
        function: "function"
      }
    },
    __type__: {
      object: object$1
    }
  },
  moment: {
    function: "function"
  },
  groupHeightMode: {
    string: string$1
  },
  groupOrder: {
    string: string$1,
    function: "function"
  },
  groupEditable: {
    add: {
      boolean: bool$1,
      undefined: "undefined"
    },
    remove: {
      boolean: bool$1,
      undefined: "undefined"
    },
    order: {
      boolean: bool$1,
      undefined: "undefined"
    },
    __type__: {
      boolean: bool$1,
      object: object$1
    }
  },
  groupOrderSwap: {
    function: "function"
  },
  height: {
    string: string$1,
    number: number$1
  },
  hiddenDates: {
    start: {
      date: date$1,
      number: number$1,
      string: string$1,
      moment: moment$1
    },
    end: {
      date: date$1,
      number: number$1,
      string: string$1,
      moment: moment$1
    },
    repeat: {
      string: string$1
    },
    __type__: {
      object: object$1,
      array: array$1
    }
  },
  itemsAlwaysDraggable: {
    item: {
      boolean: bool$1,
      undefined: "undefined"
    },
    range: {
      boolean: bool$1,
      undefined: "undefined"
    },
    __type__: {
      boolean: bool$1,
      object: object$1
    }
  },
  limitSize: {
    boolean: bool$1
  },
  locale: {
    string: string$1
  },
  locales: {
    __any__: {
      any: any$1
    },
    __type__: {
      object: object$1
    }
  },
  longSelectPressTime: {
    number: number$1
  },
  margin: {
    axis: {
      number: number$1
    },
    item: {
      horizontal: {
        number: number$1,
        undefined: "undefined"
      },
      vertical: {
        number: number$1,
        undefined: "undefined"
      },
      __type__: {
        object: object$1,
        number: number$1
      }
    },
    __type__: {
      object: object$1,
      number: number$1
    }
  },
  max: {
    date: date$1,
    number: number$1,
    string: string$1,
    moment: moment$1
  },
  maxHeight: {
    number: number$1,
    string: string$1
  },
  maxMinorChars: {
    number: number$1
  },
  min: {
    date: date$1,
    number: number$1,
    string: string$1,
    moment: moment$1
  },
  minHeight: {
    number: number$1,
    string: string$1
  },
  moveable: {
    boolean: bool$1
  },
  multiselect: {
    boolean: bool$1
  },
  multiselectPerGroup: {
    boolean: bool$1
  },
  onAdd: {
    function: "function"
  },
  onDropObjectOnItem: {
    function: "function"
  },
  onUpdate: {
    function: "function"
  },
  onMove: {
    function: "function"
  },
  onMoving: {
    function: "function"
  },
  onRemove: {
    function: "function"
  },
  onAddGroup: {
    function: "function"
  },
  onMoveGroup: {
    function: "function"
  },
  onRemoveGroup: {
    function: "function"
  },
  onInitialDrawComplete: {
    function: "function"
  },
  order: {
    function: "function"
  },
  orientation: {
    axis: {
      string: string$1,
      undefined: "undefined"
    },
    item: {
      string: string$1,
      undefined: "undefined"
    },
    __type__: {
      string: string$1,
      object: object$1
    }
  },
  selectable: {
    boolean: bool$1
  },
  sequentialSelection: {
    boolean: bool$1
  },
  showCurrentTime: {
    boolean: bool$1
  },
  showMajorLabels: {
    boolean: bool$1
  },
  showMinorLabels: {
    boolean: bool$1
  },
  showWeekScale: {
    boolean: bool$1
  },
  stack: {
    boolean: bool$1
  },
  stackSubgroups: {
    boolean: bool$1
  },
  cluster: {
    maxItems: {
      number: number$1,
      undefined: "undefined"
    },
    titleTemplate: {
      string: string$1,
      undefined: "undefined"
    },
    clusterCriteria: {
      function: "function",
      undefined: "undefined"
    },
    showStipes: {
      boolean: bool$1,
      undefined: "undefined"
    },
    fitOnDoubleClick: {
      boolean: bool$1,
      undefined: "undefined"
    },
    __type__: {
      boolean: bool$1,
      object: object$1
    }
  },
  snap: {
    function: "function",
    null: "null"
  },
  start: {
    date: date$1,
    number: number$1,
    string: string$1,
    moment: moment$1
  },
  template: {
    function: "function"
  },
  loadingScreenTemplate: {
    function: "function"
  },
  groupTemplate: {
    function: "function"
  },
  visibleFrameTemplate: {
    string: string$1,
    function: "function"
  },
  showTooltips: {
    boolean: bool$1
  },
  tooltip: {
    followMouse: {
      boolean: bool$1
    },
    overflowMethod: {
      string: ["cap", "flip", "none"]
    },
    delay: {
      number: number$1
    },
    template: {
      function: "function"
    },
    __type__: {
      object: object$1
    }
  },
  tooltipOnItemUpdateTime: {
    template: {
      function: "function"
    },
    __type__: {
      boolean: bool$1,
      object: object$1
    }
  },
  timeAxis: {
    scale: {
      string: string$1,
      undefined: "undefined"
    },
    step: {
      number: number$1,
      undefined: "undefined"
    },
    __type__: {
      object: object$1
    }
  },
  type: {
    string: string$1
  },
  width: {
    string: string$1,
    number: number$1
  },
  preferZoom: {
    boolean: bool$1
  },
  zoomable: {
    boolean: bool$1
  },
  zoomKey: {
    string: ["ctrlKey", "altKey", "shiftKey", "metaKey", ""]
  },
  zoomFriction: {
    number: number$1
  },
  zoomMax: {
    number: number$1
  },
  zoomMin: {
    number: number$1
  },
  xss: {
    disabled: {
      boolean: bool$1
    },
    filterOptions: {
      __any__: {
        any: any$1
      },
      __type__: {
        object: object$1
      }
    },
    __type__: {
      object: object$1
    }
  },
  __type__: {
    object: object$1
  }
};
let configureOptions$1 = {
  global: {
    align: ["center", "left", "right"],
    alignCurrentTime: ["none", "year", "month", "quarter", "week", "isoWeek", "day", "date", "hour", "minute", "second"],
    direction: false,
    autoResize: true,
    clickToUse: false,
    // dataAttributes: ['all'], // FIXME: can be 'all' or string[]
    editable: {
      add: false,
      remove: false,
      updateGroup: false,
      updateTime: false
    },
    end: "",
    format: {
      minorLabels: {
        millisecond: "SSS",
        second: "s",
        minute: "HH:mm",
        hour: "HH:mm",
        weekday: "ddd D",
        day: "D",
        week: "w",
        month: "MMM",
        year: "YYYY"
      },
      majorLabels: {
        millisecond: "HH:mm:ss",
        second: "D MMMM HH:mm",
        minute: "ddd D MMMM",
        hour: "ddd D MMMM",
        weekday: "MMMM YYYY",
        day: "MMMM YYYY",
        week: "MMMM YYYY",
        month: "YYYY",
        year: ""
      }
    },
    groupHeightMode: ["auto", "fixed", "fitItems"],
    //groupOrder: {string, 'function': 'function'},
    groupsDraggable: false,
    height: "",
    //hiddenDates: {object, array},
    locale: "",
    longSelectPressTime: 251,
    margin: {
      axis: [20, 0, 100, 1],
      item: {
        horizontal: [10, 0, 100, 1],
        vertical: [10, 0, 100, 1]
      }
    },
    max: "",
    maxHeight: "",
    maxMinorChars: [7, 0, 20, 1],
    min: "",
    minHeight: "",
    moveable: false,
    multiselect: false,
    multiselectPerGroup: false,
    //onAdd: {'function': 'function'},
    //onUpdate: {'function': 'function'},
    //onMove: {'function': 'function'},
    //onMoving: {'function': 'function'},
    //onRename: {'function': 'function'},
    //order: {'function': 'function'},
    orientation: {
      axis: ["both", "bottom", "top"],
      item: ["bottom", "top"]
    },
    preferZoom: false,
    selectable: true,
    showCurrentTime: false,
    showMajorLabels: true,
    showMinorLabels: true,
    stack: true,
    stackSubgroups: true,
    cluster: false,
    //snap: {'function': 'function', nada},
    start: "",
    //template: {'function': 'function'},
    //timeAxis: {
    //  scale: ['millisecond', 'second', 'minute', 'hour', 'weekday', 'day', 'week', 'month', 'year'],
    //  step: [1, 1, 10, 1]
    //},
    showTooltips: true,
    tooltip: {
      followMouse: false,
      overflowMethod: "flip",
      delay: [500, 0, 99999, 100]
    },
    tooltipOnItemUpdateTime: false,
    type: ["box", "point", "range", "background"],
    width: "100%",
    zoomable: true,
    zoomKey: ["ctrlKey", "altKey", "shiftKey", "metaKey", ""],
    zoomMax: [315360000000000, 10, 315360000000000, 1],
    zoomMin: [10, 10, 315360000000000, 1],
    xss: {
      disabled: false
    }
  }
};

var htmlColors = {
  black: "#000000",
  navy: "#000080",
  darkblue: "#00008B",
  mediumblue: "#0000CD",
  blue: "#0000FF",
  darkgreen: "#006400",
  green: "#008000",
  teal: "#008080",
  darkcyan: "#008B8B",
  deepskyblue: "#00BFFF",
  darkturquoise: "#00CED1",
  mediumspringgreen: "#00FA9A",
  lime: "#00FF00",
  springgreen: "#00FF7F",
  aqua: "#00FFFF",
  cyan: "#00FFFF",
  midnightblue: "#191970",
  dodgerblue: "#1E90FF",
  lightseagreen: "#20B2AA",
  forestgreen: "#228B22",
  seagreen: "#2E8B57",
  darkslategray: "#2F4F4F",
  limegreen: "#32CD32",
  mediumseagreen: "#3CB371",
  turquoise: "#40E0D0",
  royalblue: "#4169E1",
  steelblue: "#4682B4",
  darkslateblue: "#483D8B",
  mediumturquoise: "#48D1CC",
  indigo: "#4B0082",
  darkolivegreen: "#556B2F",
  cadetblue: "#5F9EA0",
  cornflowerblue: "#6495ED",
  mediumaquamarine: "#66CDAA",
  dimgray: "#696969",
  slateblue: "#6A5ACD",
  olivedrab: "#6B8E23",
  slategray: "#708090",
  lightslategray: "#778899",
  mediumslateblue: "#7B68EE",
  lawngreen: "#7CFC00",
  chartreuse: "#7FFF00",
  aquamarine: "#7FFFD4",
  maroon: "#800000",
  purple: "#800080",
  olive: "#808000",
  gray: "#808080",
  skyblue: "#87CEEB",
  lightskyblue: "#87CEFA",
  blueviolet: "#8A2BE2",
  darkred: "#8B0000",
  darkmagenta: "#8B008B",
  saddlebrown: "#8B4513",
  darkseagreen: "#8FBC8F",
  lightgreen: "#90EE90",
  mediumpurple: "#9370D8",
  darkviolet: "#9400D3",
  palegreen: "#98FB98",
  darkorchid: "#9932CC",
  yellowgreen: "#9ACD32",
  sienna: "#A0522D",
  brown: "#A52A2A",
  darkgray: "#A9A9A9",
  lightblue: "#ADD8E6",
  greenyellow: "#ADFF2F",
  paleturquoise: "#AFEEEE",
  lightsteelblue: "#B0C4DE",
  powderblue: "#B0E0E6",
  firebrick: "#B22222",
  darkgoldenrod: "#B8860B",
  mediumorchid: "#BA55D3",
  rosybrown: "#BC8F8F",
  darkkhaki: "#BDB76B",
  silver: "#C0C0C0",
  mediumvioletred: "#C71585",
  indianred: "#CD5C5C",
  peru: "#CD853F",
  chocolate: "#D2691E",
  tan: "#D2B48C",
  lightgrey: "#D3D3D3",
  palevioletred: "#D87093",
  thistle: "#D8BFD8",
  orchid: "#DA70D6",
  goldenrod: "#DAA520",
  crimson: "#DC143C",
  gainsboro: "#DCDCDC",
  plum: "#DDA0DD",
  burlywood: "#DEB887",
  lightcyan: "#E0FFFF",
  lavender: "#E6E6FA",
  darksalmon: "#E9967A",
  violet: "#EE82EE",
  palegoldenrod: "#EEE8AA",
  lightcoral: "#F08080",
  khaki: "#F0E68C",
  aliceblue: "#F0F8FF",
  honeydew: "#F0FFF0",
  azure: "#F0FFFF",
  sandybrown: "#F4A460",
  wheat: "#F5DEB3",
  beige: "#F5F5DC",
  whitesmoke: "#F5F5F5",
  mintcream: "#F5FFFA",
  ghostwhite: "#F8F8FF",
  salmon: "#FA8072",
  antiquewhite: "#FAEBD7",
  linen: "#FAF0E6",
  lightgoldenrodyellow: "#FAFAD2",
  oldlace: "#FDF5E6",
  red: "#FF0000",
  fuchsia: "#FF00FF",
  magenta: "#FF00FF",
  deeppink: "#FF1493",
  orangered: "#FF4500",
  tomato: "#FF6347",
  hotpink: "#FF69B4",
  coral: "#FF7F50",
  darkorange: "#FF8C00",
  lightsalmon: "#FFA07A",
  orange: "#FFA500",
  lightpink: "#FFB6C1",
  pink: "#FFC0CB",
  gold: "#FFD700",
  peachpuff: "#FFDAB9",
  navajowhite: "#FFDEAD",
  moccasin: "#FFE4B5",
  bisque: "#FFE4C4",
  mistyrose: "#FFE4E1",
  blanchedalmond: "#FFEBCD",
  papayawhip: "#FFEFD5",
  lavenderblush: "#FFF0F5",
  seashell: "#FFF5EE",
  cornsilk: "#FFF8DC",
  lemonchiffon: "#FFFACD",
  floralwhite: "#FFFAF0",
  snow: "#FFFAFA",
  yellow: "#FFFF00",
  lightyellow: "#FFFFE0",
  ivory: "#FFFFF0",
  white: "#FFFFFF"
};

/**
 * @param {number} [pixelRatio=1]
 */
class ColorPicker {
  /**
   * @param {number} [pixelRatio=1]
   */
  constructor() {
    let pixelRatio = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : 1;
    this.pixelRatio = pixelRatio;
    this.generated = false;
    this.centerCoordinates = {
      x: 289 / 2,
      y: 289 / 2
    };
    this.r = 289 * 0.49;
    this.color = {
      r: 255,
      g: 255,
      b: 255,
      a: 1.0
    };
    this.hueCircle = undefined;
    this.initialColor = {
      r: 255,
      g: 255,
      b: 255,
      a: 1.0
    };
    this.previousColor = undefined;
    this.applied = false;

    // bound by
    this.updateCallback = () => {};
    this.closeCallback = () => {};

    // create all DOM elements
    this._create();
  }

  /**
   * this inserts the colorPicker into a div from the DOM
   * @param {Element} container
   */
  insertTo(container) {
    if (this.hammer !== undefined) {
      this.hammer.destroy();
      this.hammer = undefined;
    }
    this.container = container;
    this.container.appendChild(this.frame);
    this._bindHammer();
    this._setSize();
  }

  /**
   * the callback is executed on apply and save. Bind it to the application
   * @param {function} callback
   */
  setUpdateCallback(callback) {
    if (typeof callback === "function") {
      this.updateCallback = callback;
    } else {
      throw new Error("Function attempted to set as colorPicker update callback is not a function.");
    }
  }

  /**
   * the callback is executed on apply and save. Bind it to the application
   * @param {function} callback
   */
  setCloseCallback(callback) {
    if (typeof callback === "function") {
      this.closeCallback = callback;
    } else {
      throw new Error("Function attempted to set as colorPicker closing callback is not a function.");
    }
  }

  /**
   *
   * @param {string} color
   * @returns {String}
   * @private
   */
  _isColorString(color) {
    if (typeof color === "string") {
      return htmlColors[color];
    }
  }

  /**
   * Set the color of the colorPicker
   * Supported formats:
   * 'red'                   --> HTML color string
   * '#ffffff'               --> hex string
   * 'rgb(255,255,255)'      --> rgb string
   * 'rgba(255,255,255,1.0)' --> rgba string
   * {r:255,g:255,b:255}     --> rgb object
   * {r:255,g:255,b:255,a:1.0} --> rgba object
   * @param {string|Object} color
   * @param {boolean} [setInitial=true]
   */
  setColor(color) {
    let setInitial = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : true;
    if (color === "none") {
      return;
    }
    let rgba;

    // if a html color shorthand is used, convert to hex
    var htmlColor = this._isColorString(color);
    if (htmlColor !== undefined) {
      color = htmlColor;
    }

    // check format
    if (availableUtils.isString(color) === true) {
      if (availableUtils.isValidRGB(color) === true) {
        let rgbaArray = color.substr(4).substr(0, color.length - 5).split(",");
        rgba = {
          r: rgbaArray[0],
          g: rgbaArray[1],
          b: rgbaArray[2],
          a: 1.0
        };
      } else if (availableUtils.isValidRGBA(color) === true) {
        let rgbaArray = color.substr(5).substr(0, color.length - 6).split(",");
        rgba = {
          r: rgbaArray[0],
          g: rgbaArray[1],
          b: rgbaArray[2],
          a: rgbaArray[3]
        };
      } else if (availableUtils.isValidHex(color) === true) {
        let rgbObj = availableUtils.hexToRGB(color);
        rgba = {
          r: rgbObj.r,
          g: rgbObj.g,
          b: rgbObj.b,
          a: 1.0
        };
      }
    } else {
      if (color instanceof Object) {
        if (color.r !== undefined && color.g !== undefined && color.b !== undefined) {
          let alpha = color.a !== undefined ? color.a : "1.0";
          rgba = {
            r: color.r,
            g: color.g,
            b: color.b,
            a: alpha
          };
        }
      }
    }

    // set color
    if (rgba === undefined) {
      throw new Error("Unknown color passed to the colorPicker. Supported are strings: rgb, hex, rgba. Object: rgb ({r:r,g:g,b:b,[a:a]}). Supplied: " + _JSON$stringify(color));
    } else {
      this._setColor(rgba, setInitial);
    }
  }

  /**
   * this shows the color picker.
   * The hue circle is constructed once and stored.
   */
  show() {
    if (this.closeCallback !== undefined) {
      this.closeCallback();
      this.closeCallback = undefined;
    }
    this.applied = false;
    this.frame.style.display = "block";
    this._generateHueCircle();
  }

  // ------------------------------------------ PRIVATE ----------------------------- //

  /**
   * Hide the picker. Is called by the cancel button.
   * Optional boolean to store the previous color for easy access later on.
   * @param {boolean} [storePrevious=true]
   * @private
   */
  _hide() {
    let storePrevious = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : true;
    // store the previous color for next time;
    if (storePrevious === true) {
      this.previousColor = availableUtils.extend({}, this.color);
    }
    if (this.applied === true) {
      this.updateCallback(this.initialColor);
    }
    this.frame.style.display = "none";

    // call the closing callback, restoring the onclick method.
    // this is in a setTimeout because it will trigger the show again before the click is done.
    _setTimeout(() => {
      if (this.closeCallback !== undefined) {
        this.closeCallback();
        this.closeCallback = undefined;
      }
    }, 0);
  }

  /**
   * bound to the save button. Saves and hides.
   * @private
   */
  _save() {
    this.updateCallback(this.color);
    this.applied = false;
    this._hide();
  }

  /**
   * Bound to apply button. Saves but does not close. Is undone by the cancel button.
   * @private
   */
  _apply() {
    this.applied = true;
    this.updateCallback(this.color);
    this._updatePicker(this.color);
  }

  /**
   * load the color from the previous session.
   * @private
   */
  _loadLast() {
    if (this.previousColor !== undefined) {
      this.setColor(this.previousColor, false);
    } else {
      alert("There is no last color to load...");
    }
  }

  /**
   * set the color, place the picker
   * @param {Object} rgba
   * @param {boolean} [setInitial=true]
   * @private
   */
  _setColor(rgba) {
    let setInitial = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : true;
    // store the initial color
    if (setInitial === true) {
      this.initialColor = availableUtils.extend({}, rgba);
    }
    this.color = rgba;
    let hsv = availableUtils.RGBToHSV(rgba.r, rgba.g, rgba.b);
    let angleConvert = 2 * Math.PI;
    let radius = this.r * hsv.s;
    let x = this.centerCoordinates.x + radius * Math.sin(angleConvert * hsv.h);
    let y = this.centerCoordinates.y + radius * Math.cos(angleConvert * hsv.h);
    this.colorPickerSelector.style.left = x - 0.5 * this.colorPickerSelector.clientWidth + "px";
    this.colorPickerSelector.style.top = y - 0.5 * this.colorPickerSelector.clientHeight + "px";
    this._updatePicker(rgba);
  }

  /**
   * bound to opacity control
   * @param {number} value
   * @private
   */
  _setOpacity(value) {
    this.color.a = value / 100;
    this._updatePicker(this.color);
  }

  /**
   * bound to brightness control
   * @param {number} value
   * @private
   */
  _setBrightness(value) {
    let hsv = availableUtils.RGBToHSV(this.color.r, this.color.g, this.color.b);
    hsv.v = value / 100;
    let rgba = availableUtils.HSVToRGB(hsv.h, hsv.s, hsv.v);
    rgba["a"] = this.color.a;
    this.color = rgba;
    this._updatePicker();
  }

  /**
   * update the color picker. A black circle overlays the hue circle to mimic the brightness decreasing.
   * @param {Object} rgba
   * @private
   */
  _updatePicker() {
    let rgba = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : this.color;
    let hsv = availableUtils.RGBToHSV(rgba.r, rgba.g, rgba.b);
    let ctx = this.colorPickerCanvas.getContext("2d");
    if (this.pixelRation === undefined) {
      this.pixelRatio = (window.devicePixelRatio || 1) / (ctx.webkitBackingStorePixelRatio || ctx.mozBackingStorePixelRatio || ctx.msBackingStorePixelRatio || ctx.oBackingStorePixelRatio || ctx.backingStorePixelRatio || 1);
    }
    ctx.setTransform(this.pixelRatio, 0, 0, this.pixelRatio, 0, 0);

    // clear the canvas
    let w = this.colorPickerCanvas.clientWidth;
    let h = this.colorPickerCanvas.clientHeight;
    ctx.clearRect(0, 0, w, h);
    ctx.putImageData(this.hueCircle, 0, 0);
    ctx.fillStyle = "rgba(0,0,0," + (1 - hsv.v) + ")";
    ctx.circle(this.centerCoordinates.x, this.centerCoordinates.y, this.r);
    _fillInstanceProperty(ctx).call(ctx);
    this.brightnessRange.value = 100 * hsv.v;
    this.opacityRange.value = 100 * rgba.a;
    this.initialColorDiv.style.backgroundColor = "rgba(" + this.initialColor.r + "," + this.initialColor.g + "," + this.initialColor.b + "," + this.initialColor.a + ")";
    this.newColorDiv.style.backgroundColor = "rgba(" + this.color.r + "," + this.color.g + "," + this.color.b + "," + this.color.a + ")";
  }

  /**
   * used by create to set the size of the canvas.
   * @private
   */
  _setSize() {
    this.colorPickerCanvas.style.width = "100%";
    this.colorPickerCanvas.style.height = "100%";
    this.colorPickerCanvas.width = 289 * this.pixelRatio;
    this.colorPickerCanvas.height = 289 * this.pixelRatio;
  }

  /**
   * create all dom elements
   * TODO: cleanup, lots of similar dom elements
   * @private
   */
  _create() {
    var _context, _context2, _context3, _context4;
    this.frame = document.createElement("div");
    this.frame.className = "vis-color-picker";
    this.colorPickerDiv = document.createElement("div");
    this.colorPickerSelector = document.createElement("div");
    this.colorPickerSelector.className = "vis-selector";
    this.colorPickerDiv.appendChild(this.colorPickerSelector);
    this.colorPickerCanvas = document.createElement("canvas");
    this.colorPickerDiv.appendChild(this.colorPickerCanvas);
    if (!this.colorPickerCanvas.getContext) {
      let noCanvas = document.createElement("DIV");
      noCanvas.style.color = "red";
      noCanvas.style.fontWeight = "bold";
      noCanvas.style.padding = "10px";
      noCanvas.innerHTML = "Error: your browser does not support HTML canvas";
      this.colorPickerCanvas.appendChild(noCanvas);
    } else {
      let ctx = this.colorPickerCanvas.getContext("2d");
      this.pixelRatio = (window.devicePixelRatio || 1) / (ctx.webkitBackingStorePixelRatio || ctx.mozBackingStorePixelRatio || ctx.msBackingStorePixelRatio || ctx.oBackingStorePixelRatio || ctx.backingStorePixelRatio || 1);
      this.colorPickerCanvas.getContext("2d").setTransform(this.pixelRatio, 0, 0, this.pixelRatio, 0, 0);
    }
    this.colorPickerDiv.className = "vis-color";
    this.opacityDiv = document.createElement("div");
    this.opacityDiv.className = "vis-opacity";
    this.brightnessDiv = document.createElement("div");
    this.brightnessDiv.className = "vis-brightness";
    this.arrowDiv = document.createElement("div");
    this.arrowDiv.className = "vis-arrow";
    this.opacityRange = document.createElement("input");
    try {
      this.opacityRange.type = "range"; // Not supported on IE9
      this.opacityRange.min = "0";
      this.opacityRange.max = "100";
    } catch (err) {
      // TODO: Add some error handling and remove this lint exception
    } // eslint-disable-line no-empty
    this.opacityRange.value = "100";
    this.opacityRange.className = "vis-range";
    this.brightnessRange = document.createElement("input");
    try {
      this.brightnessRange.type = "range"; // Not supported on IE9
      this.brightnessRange.min = "0";
      this.brightnessRange.max = "100";
    } catch (err) {
      // TODO: Add some error handling and remove this lint exception
    } // eslint-disable-line no-empty
    this.brightnessRange.value = "100";
    this.brightnessRange.className = "vis-range";
    this.opacityDiv.appendChild(this.opacityRange);
    this.brightnessDiv.appendChild(this.brightnessRange);
    var me = this;
    this.opacityRange.onchange = function () {
      me._setOpacity(this.value);
    };
    this.opacityRange.oninput = function () {
      me._setOpacity(this.value);
    };
    this.brightnessRange.onchange = function () {
      me._setBrightness(this.value);
    };
    this.brightnessRange.oninput = function () {
      me._setBrightness(this.value);
    };
    this.brightnessLabel = document.createElement("div");
    this.brightnessLabel.className = "vis-label vis-brightness";
    this.brightnessLabel.innerHTML = "brightness:";
    this.opacityLabel = document.createElement("div");
    this.opacityLabel.className = "vis-label vis-opacity";
    this.opacityLabel.innerHTML = "opacity:";
    this.newColorDiv = document.createElement("div");
    this.newColorDiv.className = "vis-new-color";
    this.newColorDiv.innerHTML = "new";
    this.initialColorDiv = document.createElement("div");
    this.initialColorDiv.className = "vis-initial-color";
    this.initialColorDiv.innerHTML = "initial";
    this.cancelButton = document.createElement("div");
    this.cancelButton.className = "vis-button vis-cancel";
    this.cancelButton.innerHTML = "cancel";
    this.cancelButton.onclick = _bindInstanceProperty(_context = this._hide).call(_context, this, false);
    this.applyButton = document.createElement("div");
    this.applyButton.className = "vis-button vis-apply";
    this.applyButton.innerHTML = "apply";
    this.applyButton.onclick = _bindInstanceProperty(_context2 = this._apply).call(_context2, this);
    this.saveButton = document.createElement("div");
    this.saveButton.className = "vis-button vis-save";
    this.saveButton.innerHTML = "save";
    this.saveButton.onclick = _bindInstanceProperty(_context3 = this._save).call(_context3, this);
    this.loadButton = document.createElement("div");
    this.loadButton.className = "vis-button vis-load";
    this.loadButton.innerHTML = "load last";
    this.loadButton.onclick = _bindInstanceProperty(_context4 = this._loadLast).call(_context4, this);
    this.frame.appendChild(this.colorPickerDiv);
    this.frame.appendChild(this.arrowDiv);
    this.frame.appendChild(this.brightnessLabel);
    this.frame.appendChild(this.brightnessDiv);
    this.frame.appendChild(this.opacityLabel);
    this.frame.appendChild(this.opacityDiv);
    this.frame.appendChild(this.newColorDiv);
    this.frame.appendChild(this.initialColorDiv);
    this.frame.appendChild(this.cancelButton);
    this.frame.appendChild(this.applyButton);
    this.frame.appendChild(this.saveButton);
    this.frame.appendChild(this.loadButton);
  }

  /**
   * bind hammer to the color picker
   * @private
   */
  _bindHammer() {
    this.drag = {};
    this.pinch = {};
    this.hammer = new Hammer(this.colorPickerCanvas);
    this.hammer.get("pinch").set({
      enable: true
    });
    onTouch(this.hammer, event => {
      this._moveSelector(event);
    });
    this.hammer.on("tap", event => {
      this._moveSelector(event);
    });
    this.hammer.on("panstart", event => {
      this._moveSelector(event);
    });
    this.hammer.on("panmove", event => {
      this._moveSelector(event);
    });
    this.hammer.on("panend", event => {
      this._moveSelector(event);
    });
  }

  /**
   * generate the hue circle. This is relatively heavy (200ms) and is done only once on the first time it is shown.
   * @private
   */
  _generateHueCircle() {
    if (this.generated === false) {
      let ctx = this.colorPickerCanvas.getContext("2d");
      if (this.pixelRation === undefined) {
        this.pixelRatio = (window.devicePixelRatio || 1) / (ctx.webkitBackingStorePixelRatio || ctx.mozBackingStorePixelRatio || ctx.msBackingStorePixelRatio || ctx.oBackingStorePixelRatio || ctx.backingStorePixelRatio || 1);
      }
      ctx.setTransform(this.pixelRatio, 0, 0, this.pixelRatio, 0, 0);

      // clear the canvas
      let w = this.colorPickerCanvas.clientWidth;
      let h = this.colorPickerCanvas.clientHeight;
      ctx.clearRect(0, 0, w, h);

      // draw hue circle
      let x, y, hue, sat;
      this.centerCoordinates = {
        x: w * 0.5,
        y: h * 0.5
      };
      this.r = 0.49 * w;
      let angleConvert = 2 * Math.PI / 360;
      let hfac = 1 / 360;
      let sfac = 1 / this.r;
      let rgb;
      for (hue = 0; hue < 360; hue++) {
        for (sat = 0; sat < this.r; sat++) {
          x = this.centerCoordinates.x + sat * Math.sin(angleConvert * hue);
          y = this.centerCoordinates.y + sat * Math.cos(angleConvert * hue);
          rgb = availableUtils.HSVToRGB(hue * hfac, sat * sfac, 1);
          ctx.fillStyle = "rgb(" + rgb.r + "," + rgb.g + "," + rgb.b + ")";
          ctx.fillRect(x - 0.5, y - 0.5, 2, 2);
        }
      }
      ctx.strokeStyle = "rgba(0,0,0,1)";
      ctx.circle(this.centerCoordinates.x, this.centerCoordinates.y, this.r);
      ctx.stroke();
      this.hueCircle = ctx.getImageData(0, 0, w, h);
    }
    this.generated = true;
  }

  /**
   * move the selector. This is called by hammer functions.
   *
   * @param {Event}  event   The event
   * @private
   */
  _moveSelector(event) {
    let rect = this.colorPickerDiv.getBoundingClientRect();
    let left = event.center.x - rect.left;
    let top = event.center.y - rect.top;
    let centerY = 0.5 * this.colorPickerDiv.clientHeight;
    let centerX = 0.5 * this.colorPickerDiv.clientWidth;
    let x = left - centerX;
    let y = top - centerY;
    let angle = Math.atan2(x, y);
    let radius = 0.98 * Math.min(Math.sqrt(x * x + y * y), centerX);
    let newTop = Math.cos(angle) * radius + centerY;
    let newLeft = Math.sin(angle) * radius + centerX;
    this.colorPickerSelector.style.top = newTop - 0.5 * this.colorPickerSelector.clientHeight + "px";
    this.colorPickerSelector.style.left = newLeft - 0.5 * this.colorPickerSelector.clientWidth + "px";

    // set color
    let h = angle / (2 * Math.PI);
    h = h < 0 ? h + 1 : h;
    let s = radius / this.r;
    let hsv = availableUtils.RGBToHSV(this.color.r, this.color.g, this.color.b);
    hsv.h = h;
    hsv.s = s;
    let rgba = availableUtils.HSVToRGB(hsv.h, hsv.s, hsv.v);
    rgba["a"] = this.color.a;
    this.color = rgba;

    // update previews
    this.initialColorDiv.style.backgroundColor = "rgba(" + this.initialColor.r + "," + this.initialColor.g + "," + this.initialColor.b + "," + this.initialColor.a + ")";
    this.newColorDiv.style.backgroundColor = "rgba(" + this.color.r + "," + this.color.g + "," + this.color.b + "," + this.color.a + ")";
  }
}

/**
 * The way this works is for all properties of this.possible options, you can supply the property name in any form to list the options.
 * Boolean options are recognised as Boolean
 * Number options should be written as array: [default value, min value, max value, stepsize]
 * Colors should be written as array: ['color', '#ffffff']
 * Strings with should be written as array: [option1, option2, option3, ..]
 *
 * The options are matched with their counterparts in each of the modules and the values used in the configuration are
 */
class Configurator {
  /**
   * @param {Object} parentModule        | the location where parentModule.setOptions() can be called
   * @param {Object} defaultContainer    | the default container of the module
   * @param {Object} configureOptions    | the fully configured and predefined options set found in allOptions.js
   * @param {number} pixelRatio          | canvas pixel ratio
   */
  constructor(parentModule, defaultContainer, configureOptions) {
    let pixelRatio = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : 1;
    this.parent = parentModule;
    this.changedOptions = [];
    this.container = defaultContainer;
    this.allowCreation = false;
    this.options = {};
    this.initialized = false;
    this.popupCounter = 0;
    this.defaultOptions = {
      enabled: false,
      filter: true,
      container: undefined,
      showButton: true
    };
    availableUtils.extend(this.options, this.defaultOptions);
    this.configureOptions = configureOptions;
    this.moduleOptions = {};
    this.domElements = [];
    this.popupDiv = {};
    this.popupLimit = 5;
    this.popupHistory = {};
    this.colorPicker = new ColorPicker(pixelRatio);
    this.wrapper = undefined;
  }

  /**
   * refresh all options.
   * Because all modules parse their options by themselves, we just use their options. We copy them here.
   *
   * @param {Object} options
   */
  setOptions(options) {
    if (options !== undefined) {
      // reset the popup history because the indices may have been changed.
      this.popupHistory = {};
      this._removePopup();
      let enabled = true;
      if (typeof options === "string") {
        this.options.filter = options;
      } else if (_Array$isArray(options)) {
        this.options.filter = options.join();
      } else if (typeof options === "object") {
        if (options == null) {
          throw new TypeError("options cannot be null");
        }
        if (options.container !== undefined) {
          this.options.container = options.container;
        }
        if (_filterInstanceProperty(options) !== undefined) {
          this.options.filter = _filterInstanceProperty(options);
        }
        if (options.showButton !== undefined) {
          this.options.showButton = options.showButton;
        }
        if (options.enabled !== undefined) {
          enabled = options.enabled;
        }
      } else if (typeof options === "boolean") {
        this.options.filter = true;
        enabled = options;
      } else if (typeof options === "function") {
        this.options.filter = options;
        enabled = true;
      }
      if (_filterInstanceProperty(this.options) === false) {
        enabled = false;
      }
      this.options.enabled = enabled;
    }
    this._clean();
  }

  /**
   *
   * @param {Object} moduleOptions
   */
  setModuleOptions(moduleOptions) {
    this.moduleOptions = moduleOptions;
    if (this.options.enabled === true) {
      this._clean();
      if (this.options.container !== undefined) {
        this.container = this.options.container;
      }
      this._create();
    }
  }

  /**
   * Create all DOM elements
   * @private
   */
  _create() {
    this._clean();
    this.changedOptions = [];
    let filter = _filterInstanceProperty(this.options);
    let counter = 0;
    let show = false;
    for (let option in this.configureOptions) {
      if (!Object.prototype.hasOwnProperty.call(this.configureOptions, option)) continue;
      this.allowCreation = false;
      show = false;
      if (typeof filter === "function") {
        show = filter(option, []);
        show = show || this._handleObject(this.configureOptions[option], [option], true);
      } else if (filter === true || _indexOfInstanceProperty(filter).call(filter, option) !== -1) {
        show = true;
      }
      if (show !== false) {
        this.allowCreation = true;

        // linebreak between categories
        if (counter > 0) {
          this._makeItem([]);
        }
        // a header for the category
        this._makeHeader(option);

        // get the sub options
        this._handleObject(this.configureOptions[option], [option]);
      }
      counter++;
    }
    this._makeButton();
    this._push();
    //~ this.colorPicker.insertTo(this.container);
  }

  /**
   * draw all DOM elements on the screen
   * @private
   */
  _push() {
    this.wrapper = document.createElement("div");
    this.wrapper.className = "vis-configuration-wrapper";
    this.container.appendChild(this.wrapper);
    for (var i = 0; i < this.domElements.length; i++) {
      this.wrapper.appendChild(this.domElements[i]);
    }
    this._showPopupIfNeeded();
  }

  /**
   * delete all DOM elements
   * @private
   */
  _clean() {
    for (var i = 0; i < this.domElements.length; i++) {
      this.wrapper.removeChild(this.domElements[i]);
    }
    if (this.wrapper !== undefined) {
      this.container.removeChild(this.wrapper);
      this.wrapper = undefined;
    }
    this.domElements = [];
    this._removePopup();
  }

  /**
   * get the value from the actualOptions if it exists
   * @param {array} path    | where to look for the actual option
   * @returns {*}
   * @private
   */
  _getValue(path) {
    let base = this.moduleOptions;
    for (let i = 0; i < path.length; i++) {
      if (base[path[i]] !== undefined) {
        base = base[path[i]];
      } else {
        base = undefined;
        break;
      }
    }
    return base;
  }

  /**
   * all option elements are wrapped in an item
   * @param {Array} path    | where to look for the actual option
   * @param {Array.<Element>} domElements
   * @returns {number}
   * @private
   */
  _makeItem(path) {
    if (this.allowCreation === true) {
      let item = document.createElement("div");
      item.className = "vis-configuration vis-config-item vis-config-s" + path.length;
      for (var _len = arguments.length, domElements = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
        domElements[_key - 1] = arguments[_key];
      }
      _forEachInstanceProperty(domElements).call(domElements, element => {
        item.appendChild(element);
      });
      this.domElements.push(item);
      return this.domElements.length;
    }
    return 0;
  }

  /**
   * header for major subjects
   * @param {string} name
   * @private
   */
  _makeHeader(name) {
    let div = document.createElement("div");
    div.className = "vis-configuration vis-config-header";
    div.innerHTML = availableUtils.xss(name);
    this._makeItem([], div);
  }

  /**
   * make a label, if it is an object label, it gets different styling.
   * @param {string} name
   * @param {array} path    | where to look for the actual option
   * @param {string} objectLabel
   * @returns {HTMLElement}
   * @private
   */
  _makeLabel(name, path) {
    let objectLabel = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : false;
    let div = document.createElement("div");
    div.className = "vis-configuration vis-config-label vis-config-s" + path.length;
    if (objectLabel === true) {
      div.innerHTML = availableUtils.xss("<i><b>" + name + ":</b></i>");
    } else {
      div.innerHTML = availableUtils.xss(name + ":");
    }
    return div;
  }

  /**
   * make a dropdown list for multiple possible string optoins
   * @param {Array.<number>} arr
   * @param {number} value
   * @param {array} path    | where to look for the actual option
   * @private
   */
  _makeDropdown(arr, value, path) {
    let select = document.createElement("select");
    select.className = "vis-configuration vis-config-select";
    let selectedValue = 0;
    if (value !== undefined) {
      if (_indexOfInstanceProperty(arr).call(arr, value) !== -1) {
        selectedValue = _indexOfInstanceProperty(arr).call(arr, value);
      }
    }
    for (let i = 0; i < arr.length; i++) {
      let option = document.createElement("option");
      option.value = arr[i];
      if (i === selectedValue) {
        option.selected = "selected";
      }
      option.innerHTML = arr[i];
      select.appendChild(option);
    }
    let me = this;
    select.onchange = function () {
      me._update(this.value, path);
    };
    let label = this._makeLabel(path[path.length - 1], path);
    this._makeItem(path, label, select);
  }

  /**
   * make a range object for numeric options
   * @param {Array.<number>} arr
   * @param {number} value
   * @param {array} path    | where to look for the actual option
   * @private
   */
  _makeRange(arr, value, path) {
    let defaultValue = arr[0];
    let min = arr[1];
    let max = arr[2];
    let step = arr[3];
    let range = document.createElement("input");
    range.className = "vis-configuration vis-config-range";
    try {
      range.type = "range"; // not supported on IE9
      range.min = min;
      range.max = max;
    } catch (err) {
      // TODO: Add some error handling and remove this lint exception
    } // eslint-disable-line no-empty
    range.step = step;

    // set up the popup settings in case they are needed.
    let popupString = "";
    let popupValue = 0;
    if (value !== undefined) {
      let factor = 1.2;
      if (value < 0 && value * factor < min) {
        range.min = Math.ceil(value * factor);
        popupValue = range.min;
        popupString = "range increased";
      } else if (value / factor < min) {
        range.min = Math.ceil(value / factor);
        popupValue = range.min;
        popupString = "range increased";
      }
      if (value * factor > max && max !== 1) {
        range.max = Math.ceil(value * factor);
        popupValue = range.max;
        popupString = "range increased";
      }
      range.value = value;
    } else {
      range.value = defaultValue;
    }
    let input = document.createElement("input");
    input.className = "vis-configuration vis-config-rangeinput";
    input.value = Number(range.value);
    var me = this;
    range.onchange = function () {
      input.value = this.value;
      me._update(Number(this.value), path);
    };
    range.oninput = function () {
      input.value = this.value;
    };
    let label = this._makeLabel(path[path.length - 1], path);
    let itemIndex = this._makeItem(path, label, range, input);

    // if a popup is needed AND it has not been shown for this value, show it.
    if (popupString !== "" && this.popupHistory[itemIndex] !== popupValue) {
      this.popupHistory[itemIndex] = popupValue;
      this._setupPopup(popupString, itemIndex);
    }
  }

  /**
   * make a button object
   * @private
   */
  _makeButton() {
    if (this.options.showButton === true) {
      let generateButton = document.createElement("div");
      generateButton.className = "vis-configuration vis-config-button";
      generateButton.innerHTML = "generate options";
      generateButton.onclick = () => {
        this._printOptions();
      };
      generateButton.onmouseover = () => {
        generateButton.className = "vis-configuration vis-config-button hover";
      };
      generateButton.onmouseout = () => {
        generateButton.className = "vis-configuration vis-config-button";
      };
      this.optionsContainer = document.createElement("div");
      this.optionsContainer.className = "vis-configuration vis-config-option-container";
      this.domElements.push(this.optionsContainer);
      this.domElements.push(generateButton);
    }
  }

  /**
   * prepare the popup
   * @param {string} string
   * @param {number} index
   * @private
   */
  _setupPopup(string, index) {
    if (this.initialized === true && this.allowCreation === true && this.popupCounter < this.popupLimit) {
      let div = document.createElement("div");
      div.id = "vis-configuration-popup";
      div.className = "vis-configuration-popup";
      div.innerHTML = availableUtils.xss(string);
      div.onclick = () => {
        this._removePopup();
      };
      this.popupCounter += 1;
      this.popupDiv = {
        html: div,
        index: index
      };
    }
  }

  /**
   * remove the popup from the dom
   * @private
   */
  _removePopup() {
    if (this.popupDiv.html !== undefined) {
      this.popupDiv.html.parentNode.removeChild(this.popupDiv.html);
      clearTimeout(this.popupDiv.hideTimeout);
      clearTimeout(this.popupDiv.deleteTimeout);
      this.popupDiv = {};
    }
  }

  /**
   * Show the popup if it is needed.
   * @private
   */
  _showPopupIfNeeded() {
    if (this.popupDiv.html !== undefined) {
      let correspondingElement = this.domElements[this.popupDiv.index];
      let rect = correspondingElement.getBoundingClientRect();
      this.popupDiv.html.style.left = rect.left + "px";
      this.popupDiv.html.style.top = rect.top - 30 + "px"; // 30 is the height;
      document.body.appendChild(this.popupDiv.html);
      this.popupDiv.hideTimeout = _setTimeout(() => {
        this.popupDiv.html.style.opacity = 0;
      }, 1500);
      this.popupDiv.deleteTimeout = _setTimeout(() => {
        this._removePopup();
      }, 1800);
    }
  }

  /**
   * make a checkbox for boolean options.
   * @param {number} defaultValue
   * @param {number} value
   * @param {array} path    | where to look for the actual option
   * @private
   */
  _makeCheckbox(defaultValue, value, path) {
    var checkbox = document.createElement("input");
    checkbox.type = "checkbox";
    checkbox.className = "vis-configuration vis-config-checkbox";
    checkbox.checked = defaultValue;
    if (value !== undefined) {
      checkbox.checked = value;
      if (value !== defaultValue) {
        if (typeof defaultValue === "object") {
          if (value !== defaultValue.enabled) {
            this.changedOptions.push({
              path: path,
              value: value
            });
          }
        } else {
          this.changedOptions.push({
            path: path,
            value: value
          });
        }
      }
    }
    let me = this;
    checkbox.onchange = function () {
      me._update(this.checked, path);
    };
    let label = this._makeLabel(path[path.length - 1], path);
    this._makeItem(path, label, checkbox);
  }

  /**
   * make a text input field for string options.
   * @param {number} defaultValue
   * @param {number} value
   * @param {array} path    | where to look for the actual option
   * @private
   */
  _makeTextInput(defaultValue, value, path) {
    var checkbox = document.createElement("input");
    checkbox.type = "text";
    checkbox.className = "vis-configuration vis-config-text";
    checkbox.value = value;
    if (value !== defaultValue) {
      this.changedOptions.push({
        path: path,
        value: value
      });
    }
    let me = this;
    checkbox.onchange = function () {
      me._update(this.value, path);
    };
    let label = this._makeLabel(path[path.length - 1], path);
    this._makeItem(path, label, checkbox);
  }

  /**
   * make a color field with a color picker for color fields
   * @param {Array.<number>} arr
   * @param {number} value
   * @param {array} path    | where to look for the actual option
   * @private
   */
  _makeColorField(arr, value, path) {
    let defaultColor = arr[1];
    let div = document.createElement("div");
    value = value === undefined ? defaultColor : value;
    if (value !== "none") {
      div.className = "vis-configuration vis-config-colorBlock";
      div.style.backgroundColor = value;
    } else {
      div.className = "vis-configuration vis-config-colorBlock none";
    }
    value = value === undefined ? defaultColor : value;
    div.onclick = () => {
      this._showColorPicker(value, div, path);
    };
    let label = this._makeLabel(path[path.length - 1], path);
    this._makeItem(path, label, div);
  }

  /**
   * used by the color buttons to call the color picker.
   * @param {number} value
   * @param {HTMLElement} div
   * @param {array} path    | where to look for the actual option
   * @private
   */
  _showColorPicker(value, div, path) {
    // clear the callback from this div
    div.onclick = function () {};
    this.colorPicker.insertTo(div);
    this.colorPicker.show();
    this.colorPicker.setColor(value);
    this.colorPicker.setUpdateCallback(color => {
      let colorString = "rgba(" + color.r + "," + color.g + "," + color.b + "," + color.a + ")";
      div.style.backgroundColor = colorString;
      this._update(colorString, path);
    });

    // on close of the colorpicker, restore the callback.
    this.colorPicker.setCloseCallback(() => {
      div.onclick = () => {
        this._showColorPicker(value, div, path);
      };
    });
  }

  /**
   * parse an object and draw the correct items
   * @param {Object} obj
   * @param {array} [path=[]]    | where to look for the actual option
   * @param {boolean} [checkOnly=false]
   * @returns {boolean}
   * @private
   */
  _handleObject(obj) {
    let path = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : [];
    let checkOnly = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : false;
    let show = false;
    let filter = _filterInstanceProperty(this.options);
    let visibleInSet = false;
    for (let subObj in obj) {
      if (!Object.prototype.hasOwnProperty.call(obj, subObj)) continue;
      show = true;
      let item = obj[subObj];
      let newPath = availableUtils.copyAndExtendArray(path, subObj);
      if (typeof filter === "function") {
        show = filter(subObj, path);

        // if needed we must go deeper into the object.
        if (show === false) {
          if (!_Array$isArray(item) && typeof item !== "string" && typeof item !== "boolean" && item instanceof Object) {
            this.allowCreation = false;
            show = this._handleObject(item, newPath, true);
            this.allowCreation = checkOnly === false;
          }
        }
      }
      if (show !== false) {
        visibleInSet = true;
        let value = this._getValue(newPath);
        if (_Array$isArray(item)) {
          this._handleArray(item, value, newPath);
        } else if (typeof item === "string") {
          this._makeTextInput(item, value, newPath);
        } else if (typeof item === "boolean") {
          this._makeCheckbox(item, value, newPath);
        } else if (item instanceof Object) {
          // collapse the physics options that are not enabled
          let draw = true;
          if (_indexOfInstanceProperty(path).call(path, "physics") !== -1) {
            if (this.moduleOptions.physics.solver !== subObj) {
              draw = false;
            }
          }
          if (draw === true) {
            // initially collapse options with an disabled enabled option.
            if (item.enabled !== undefined) {
              let enabledPath = availableUtils.copyAndExtendArray(newPath, "enabled");
              let enabledValue = this._getValue(enabledPath);
              if (enabledValue === true) {
                let label = this._makeLabel(subObj, newPath, true);
                this._makeItem(newPath, label);
                visibleInSet = this._handleObject(item, newPath) || visibleInSet;
              } else {
                this._makeCheckbox(item, enabledValue, newPath);
              }
            } else {
              let label = this._makeLabel(subObj, newPath, true);
              this._makeItem(newPath, label);
              visibleInSet = this._handleObject(item, newPath) || visibleInSet;
            }
          }
        } else {
          console.error("dont know how to handle", item, subObj, newPath);
        }
      }
    }
    return visibleInSet;
  }

  /**
   * handle the array type of option
   * @param {Array.<number>} arr
   * @param {number} value
   * @param {array} path    | where to look for the actual option
   * @private
   */
  _handleArray(arr, value, path) {
    if (typeof arr[0] === "string" && arr[0] === "color") {
      this._makeColorField(arr, value, path);
      if (arr[1] !== value) {
        this.changedOptions.push({
          path: path,
          value: value
        });
      }
    } else if (typeof arr[0] === "string") {
      this._makeDropdown(arr, value, path);
      if (arr[0] !== value) {
        this.changedOptions.push({
          path: path,
          value: value
        });
      }
    } else if (typeof arr[0] === "number") {
      this._makeRange(arr, value, path);
      if (arr[0] !== value) {
        this.changedOptions.push({
          path: path,
          value: Number(value)
        });
      }
    }
  }

  /**
   * called to update the network with the new settings.
   * @param {number} value
   * @param {array} path    | where to look for the actual option
   * @private
   */
  _update(value, path) {
    let options = this._constructOptions(value, path);
    if (this.parent.body && this.parent.body.emitter && this.parent.body.emitter.emit) {
      this.parent.body.emitter.emit("configChange", options);
    }
    this.initialized = true;
    this.parent.setOptions(options);
  }

  /**
   *
   * @param {string|Boolean} value
   * @param {Array.<string>} path
   * @param {{}} optionsObj
   * @returns {{}}
   * @private
   */
  _constructOptions(value, path) {
    let optionsObj = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};
    let pointer = optionsObj;

    // when dropdown boxes can be string or boolean, we typecast it into correct types
    value = value === "true" ? true : value;
    value = value === "false" ? false : value;
    for (let i = 0; i < path.length; i++) {
      if (path[i] !== "global") {
        if (pointer[path[i]] === undefined) {
          pointer[path[i]] = {};
        }
        if (i !== path.length - 1) {
          pointer = pointer[path[i]];
        } else {
          pointer[path[i]] = value;
        }
      }
    }
    return optionsObj;
  }

  /**
   * @private
   */
  _printOptions() {
    let options = this.getOptions();
    this.optionsContainer.innerHTML = "<pre>var options = " + _JSON$stringify(options, null, 2) + "</pre>";
  }

  /**
   *
   * @returns {{}} options
   */
  getOptions() {
    let options = {};
    for (var i = 0; i < this.changedOptions.length; i++) {
      this._constructOptions(this.changedOptions[i].value, this.changedOptions[i].path, options);
    }
    return options;
  }
}

/**
 * Create a timeline visualization
 * @extends Core
 */
class Timeline extends Core {
  /**
   * @param {HTMLElement} container
   * @param {vis.DataSet | vis.DataView | Array} [items]
   * @param {vis.DataSet | vis.DataView | Array} [groups]
   * @param {Object} [options]  See Timeline.setOptions for the available options.
   * @constructor Timeline
   */
  constructor(container, items, groups, options) {
    var _context2, _context3, _context4, _context5, _context6, _context7, _context8;
    super();
    this.initTime = new Date();
    this.itemsDone = false;
    if (!(this instanceof Timeline)) {
      throw new SyntaxError("Constructor must be called with the new operator");
    }

    // if the third element is options, the forth is groups (optionally);
    if (!(_Array$isArray(groups) || isDataViewLike(groups)) && groups instanceof Object) {
      const forthArgument = options;
      options = groups;
      groups = forthArgument;
    }

    // TODO: REMOVE THIS in the next MAJOR release
    // see https://github.com/almende/vis/issues/2511
    if (options && options.throttleRedraw) {
      console.warn('Timeline option "throttleRedraw" is DEPRICATED and no longer supported. It will be removed in the next MAJOR release.');
    }
    const me = this;
    this.defaultOptions = {
      autoResize: true,
      longSelectPressTime: 251,
      orientation: {
        axis: "bottom",
        // axis orientation: 'bottom', 'top', or 'both'
        item: "bottom" // not relevant
      },
      moment: moment$2
    };
    this.options = availableUtils.deepExtend({}, this.defaultOptions);
    options && availableUtils.setupXSSProtection(options.xss);

    // Create the DOM, props, and emitter
    this._create(container);
    if (!options || options && typeof options.rtl == "undefined") {
      this.dom.root.style.visibility = "hidden";
      let directionFromDom;
      let domNode = this.dom.root;
      while (!directionFromDom && domNode) {
        directionFromDom = window.getComputedStyle(domNode, null).direction;
        domNode = domNode.parentElement;
      }
      this.options.rtl = directionFromDom && directionFromDom.toLowerCase() == "rtl";
    } else {
      this.options.rtl = options.rtl;
    }
    if (options) {
      if (options.rollingMode) {
        this.options.rollingMode = options.rollingMode;
      }
      if (options.onInitialDrawComplete) {
        this.options.onInitialDrawComplete = options.onInitialDrawComplete;
      }
      if (options.onTimeout) {
        this.options.onTimeout = options.onTimeout;
      }
      if (options.loadingScreenTemplate) {
        this.options.loadingScreenTemplate = options.loadingScreenTemplate;
      }
    }

    // Prepare loading screen
    const loadingScreenFragment = document.createElement("div");
    if (this.options.loadingScreenTemplate) {
      var _context;
      const templateFunction = _bindInstanceProperty(_context = this.options.loadingScreenTemplate).call(_context, this);
      const loadingScreen = templateFunction(this.dom.loadingScreen);
      if (loadingScreen instanceof Object && !(loadingScreen instanceof Element)) {
        templateFunction(loadingScreenFragment);
      } else {
        if (loadingScreen instanceof Element) {
          loadingScreenFragment.innerHTML = "";
          loadingScreenFragment.appendChild(loadingScreen);
        } else if (loadingScreen != undefined) {
          loadingScreenFragment.innerHTML = availableUtils.xss(loadingScreen);
        }
      }
    }
    this.dom.loadingScreen.appendChild(loadingScreenFragment);

    // all components listed here will be repainted automatically
    this.components = [];
    this.body = {
      dom: this.dom,
      domProps: this.props,
      emitter: {
        on: _bindInstanceProperty(_context2 = this.on).call(_context2, this),
        off: _bindInstanceProperty(_context3 = this.off).call(_context3, this),
        emit: _bindInstanceProperty(_context4 = this.emit).call(_context4, this)
      },
      hiddenDates: [],
      util: {
        getScale() {
          return me.timeAxis.step.scale;
        },
        getStep() {
          return me.timeAxis.step.step;
        },
        toScreen: _bindInstanceProperty(_context5 = me._toScreen).call(_context5, me),
        toGlobalScreen: _bindInstanceProperty(_context6 = me._toGlobalScreen).call(_context6, me),
        // this refers to the root.width
        toTime: _bindInstanceProperty(_context7 = me._toTime).call(_context7, me),
        toGlobalTime: _bindInstanceProperty(_context8 = me._toGlobalTime).call(_context8, me)
      }
    };

    // range
    this.range = new Range(this.body, this.options);
    this.components.push(this.range);
    this.body.range = this.range;

    // time axis
    this.timeAxis = new TimeAxis(this.body, this.options);
    this.timeAxis2 = null; // used in case of orientation option 'both'
    this.components.push(this.timeAxis);

    // current time bar
    this.currentTime = new CurrentTime(this.body, this.options);
    this.components.push(this.currentTime);

    // item set
    this.itemSet = new ItemSet(this.body, this.options);
    this.components.push(this.itemSet);
    this.itemsData = null; // DataSet
    this.groupsData = null; // DataSet

    /**
     * Emit an event.
     * @param {string} eventName Name of event.
     * @param {Event} event The event object.
     */
    function emit(eventName, event) {
      if (!me.hasListeners(eventName)) return;
      me.emit(eventName, me.getEventProperties(event));
    }
    this.dom.root.onclick = event => emit("click", event);
    this.dom.root.ondblclick = event => emit("doubleClick", event);
    this.dom.root.oncontextmenu = event => emit("contextmenu", event);
    this.dom.root.onmouseover = event => emit("mouseOver", event);
    if (window.PointerEvent) {
      this.dom.root.onpointerdown = event => emit("mouseDown", event);
      this.dom.root.onpointermove = event => emit("mouseMove", event);
      this.dom.root.onpointerup = event => emit("mouseUp", event);
    } else {
      this.dom.root.onmousemove = event => emit("mouseMove", event);
      this.dom.root.onmousedown = event => emit("mouseDown", event);
      this.dom.root.onmouseup = event => emit("mouseUp", event);
    }

    //Single time autoscale/fit
    this.initialFitDone = false;
    this.on("changed", () => {
      if (me.itemsData == null) return;
      if (!me.initialFitDone && !me.options.rollingMode) {
        me.initialFitDone = true;
        if (me.options.start != undefined || me.options.end != undefined) {
          if (me.options.start == undefined || me.options.end == undefined) {
            var range = me.getItemRange();
          }
          const start = me.options.start != undefined ? me.options.start : range.min;
          const end = me.options.end != undefined ? me.options.end : range.max;
          me.setWindow(start, end, {
            animation: false
          });
        } else {
          me.fit({
            animation: false
          });
        }
      }
      if (!me.initialDrawDone && (me.initialRangeChangeDone || !me.options.start && !me.options.end || me.options.rollingMode)) {
        me.initialDrawDone = true;
        me.itemSet.initialDrawDone = true;
        me.dom.root.style.visibility = "visible";
        me.dom.loadingScreen.parentNode.removeChild(me.dom.loadingScreen);
        if (me.options.onInitialDrawComplete) {
          _setTimeout(() => {
            return me.options.onInitialDrawComplete();
          }, 0);
        }
      }
    });
    this.on("destroyTimeline", () => {
      me.destroy();
    });

    // apply options
    if (options) {
      this.setOptions(options);
    }
    this.body.emitter.on("fit", args => {
      this._onFit(args);
      this.redraw();
    });

    // IMPORTANT: THIS HAPPENS BEFORE SET ITEMS!
    if (groups) {
      this.setGroups(groups);
    }

    // create itemset
    if (items) {
      this.setItems(items);
    }

    // draw for the first time
    this._redraw();
  }

  /**
   * Load a configurator
   * @return {Object}
   * @private
   */
  _createConfigurator() {
    return new Configurator(this, this.dom.container, configureOptions$1);
  }

  /**
   * Force a redraw. The size of all items will be recalculated.
   * Can be useful to manually redraw when option autoResize=false and the window
   * has been resized, or when the items CSS has been changed.
   *
   * Note: this function will be overridden on construction with a trottled version
   */
  redraw() {
    this.itemSet && this.itemSet.markDirty({
      refreshItems: true
    });
    this._redraw();
  }

  /**
   * Remove an item from the group
   * @param {object} options
   */
  setOptions(options) {
    // validate options
    let errorFound = Validator.validate(options, allOptions$1);
    if (errorFound === true) {
      console.log("%cErrors have been found in the supplied options object.", printStyle);
    }
    Core.prototype.setOptions.call(this, options);
    if ("type" in options) {
      if (options.type !== this.options.type) {
        this.options.type = options.type;

        // force recreation of all items
        const itemsData = this.itemsData;
        if (itemsData) {
          const selection = this.getSelection();
          this.setItems(null); // remove all
          this.setItems(itemsData.rawDS); // add all
          this.setSelection(selection); // restore selection
        }
      }
    }
  }

  /**
   * Set items
   * @param {vis.DataSet | Array | null} items
   */
  setItems(items) {
    this.itemsDone = false;

    // convert to type DataSet when needed
    let newDataSet;
    if (!items) {
      newDataSet = null;
    } else if (isDataViewLike(items)) {
      newDataSet = typeCoerceDataSet(items);
    } else {
      // turn an array into a dataset
      newDataSet = typeCoerceDataSet(new DataSet(items));
    }

    // set items
    if (this.itemsData) {
      // stop maintaining a coerced version of the old data set
      this.itemsData.dispose();
    }
    this.itemsData = newDataSet;
    this.itemSet && this.itemSet.setItems(newDataSet != null ? newDataSet.rawDS : null);
  }

  /**
   * Set groups
   * @param {vis.DataSet | Array} groups
   */
  setGroups(groups) {
    // convert to type DataSet when needed
    let newDataSet;
    const filter = group => group.visible !== false;
    if (!groups) {
      newDataSet = null;
    } else {
      // If groups is array, turn to DataSet & build dataview from that
      if (_Array$isArray(groups)) groups = new DataSet(groups);
      newDataSet = new DataView(groups, {
        filter
      });
    }

    // This looks weird but it's necessary to prevent memory leaks.
    //
    // The problem is that the DataView will exist as long as the DataSet it's
    // connected to. This will force it to swap the groups DataSet for it's own
    // DataSet. In this arrangement it will become unreferenced from the outside
    // and garbage collected.
    //
    // IMPORTANT NOTE: If `this.groupsData` is a DataView was created in this
    // method. Even if the original is a DataView already a new one has been
    // created and assigned to `this.groupsData`. In case this changes in the
    // future it will be necessary to rework this!!!!
    if (this.groupsData != null && typeof this.groupsData.setData === "function") {
      this.groupsData.setData(null);
    }
    this.groupsData = newDataSet;
    this.itemSet.setGroups(newDataSet);
  }

  /**
   * Set both items and groups in one go
   * @param {{items: (Array | vis.DataSet), groups: (Array | vis.DataSet)}} data
   */
  setData(data) {
    if (data && data.groups) {
      this.setGroups(data.groups);
    }
    if (data && data.items) {
      this.setItems(data.items);
    }
  }

  /**
   * Set selected items by their id. Replaces the current selection
   * Unknown id's are silently ignored.
   * @param {string[] | string} [ids]  An array with zero or more id's of the items to be
   *                                selected. If ids is an empty array, all items will be
   *                                unselected.
   * @param {Object} [options]      Available options:
   *                                `focus: boolean`
   *                                    If true, focus will be set to the selected item(s)
   *                                `animation: boolean | {duration: number, easingFunction: string}`
   *                                    If true (default), the range is animated
   *                                    smoothly to the new window. An object can be
   *                                    provided to specify duration and easing function.
   *                                    Default duration is 500 ms, and default easing
   *                                    function is 'easeInOutQuad'.
   *                                    Only applicable when option focus is true.
   */
  setSelection(ids, options) {
    this.itemSet && this.itemSet.setSelection(ids);
    if (options && options.focus) {
      this.focus(ids, options);
    }
  }

  /**
   * Get the selected items by their id
   * @return {Array} ids  The ids of the selected items
   */
  getSelection() {
    return this.itemSet && this.itemSet.getSelection() || [];
  }

  /**
   * Adjust the visible window such that the selected item (or multiple items)
   * are centered on screen.
   * @param {string | String[]} id     An item id or array with item ids
   * @param {Object} [options]      Available options:
   *                                `animation: boolean | {duration: number, easingFunction: string}`
   *                                    If true (default), the range is animated
   *                                    smoothly to the new window. An object can be
   *                                    provided to specify duration and easing function.
   *                                    Default duration is 500 ms, and default easing
   *                                    function is 'easeInOutQuad'.
   *                                `zoom: boolean`
   *                                    If true (default), the timeline will
   *                                    zoom on the element after focus it.
   */
  focus(id, options) {
    if (!this.itemsData || id == undefined) return;
    const ids = _Array$isArray(id) ? id : [id];

    // get the specified item(s)
    const itemsData = this.itemsData.get(ids);

    // calculate minimum start and maximum end of specified items
    let start = null;
    let end = null;
    _forEachInstanceProperty(itemsData).call(itemsData, itemData => {
      const s = itemData.start.valueOf();
      const e = "end" in itemData ? itemData.end.valueOf() : itemData.start.valueOf();
      if (start === null || s < start) {
        start = s;
      }
      if (end === null || e > end) {
        end = e;
      }
    });
    if (start !== null && end !== null) {
      const me = this;
      // Use the first item for the vertical focus
      const item = this.itemSet.items[ids[0]];
      let startPos = this._getScrollTop() * -1;
      let initialVerticalScroll = null;

      // Setup a handler for each frame of the vertical scroll
      const verticalAnimationFrame = (ease, willDraw, done) => {
        const verticalScroll = getItemVerticalScroll(me, item);
        if (verticalScroll === false) {
          return; // We don't need to scroll, so do nothing
        }
        if (!initialVerticalScroll) {
          initialVerticalScroll = verticalScroll;
        }
        if (initialVerticalScroll.itemTop == verticalScroll.itemTop && !initialVerticalScroll.shouldScroll) {
          return; // We don't need to scroll, so do nothing
        } else if (initialVerticalScroll.itemTop != verticalScroll.itemTop && verticalScroll.shouldScroll) {
          // The redraw shifted elements, so reset the animation to correct
          initialVerticalScroll = verticalScroll;
          startPos = me._getScrollTop() * -1;
        }
        const from = startPos;
        const to = initialVerticalScroll.scrollOffset;
        const scrollTop = done ? to : from + (to - from) * ease;
        me._setScrollTop(-scrollTop);
        if (!willDraw) {
          me._redraw();
        }
      };

      // Enforces the final vertical scroll position
      const setFinalVerticalPosition = () => {
        const finalVerticalScroll = getItemVerticalScroll(me, item);
        if (finalVerticalScroll.shouldScroll && finalVerticalScroll.itemTop != initialVerticalScroll.itemTop) {
          me._setScrollTop(-finalVerticalScroll.scrollOffset);
          me._redraw();
        }
      };

      // Perform one last check at the end to make sure the final vertical
      // position is correct
      const finalVerticalCallback = () => {
        // Double check we ended at the proper scroll position
        setFinalVerticalPosition();

        // Let the redraw settle and finalize the position.
        _setTimeout(setFinalVerticalPosition, 100);
      };

      // calculate the new middle and interval for the window
      const zoom = options && options.zoom !== undefined ? options.zoom : true;
      const middle = (start + end) / 2;
      const interval = zoom ? (end - start) * 1.1 : Math.max(this.range.end - this.range.start, (end - start) * 1.1);
      const animation = options && options.animation !== undefined ? options.animation : true;
      if (!animation) {
        // We aren't animating so set a default so that the final callback forces the vertical location
        initialVerticalScroll = {
          shouldScroll: false,
          scrollOffset: -1,
          itemTop: -1
        };
      }
      this.range.stopRolling();
      this.range.setRange(middle - interval / 2, middle + interval / 2, {
        animation
      }, finalVerticalCallback, verticalAnimationFrame);
    }
  }

  /**
   * Set Timeline window such that it fits all items
   * @param {Object} [options]  Available options:
   *                                `animation: boolean | {duration: number, easingFunction: string}`
   *                                    If true (default), the range is animated
   *                                    smoothly to the new window. An object can be
   *                                    provided to specify duration and easing function.
   *                                    Default duration is 500 ms, and default easing
   *                                    function is 'easeInOutQuad'.
   * @param {function} [callback]
   */
  fit(options, callback) {
    const animation = options && options.animation !== undefined ? options.animation : true;
    let range;
    if (this.itemsData.length === 1 && this.itemsData.get()[0].end === undefined) {
      // a single item -> don't fit, just show a range around the item from -4 to +3 days
      range = this.getDataRange();
      this.moveTo(range.min.valueOf(), {
        animation
      }, callback);
    } else {
      // exactly fit the items (plus a small margin)
      range = this.getItemRange();
      this.range.setRange(range.min, range.max, {
        animation
      }, callback);
    }
  }

  /**
   * Determine the range of the items, taking into account their actual width
   * and a margin of 10 pixels on both sides.
   *
   * @returns {{min: Date, max: Date}}
   */
  getItemRange() {
    // get a rough approximation for the range based on the items start and end dates
    const range = this.getDataRange();
    let min = range.min !== null ? range.min.valueOf() : null;
    let max = range.max !== null ? range.max.valueOf() : null;
    let minItem = null;
    let maxItem = null;
    if (min != null && max != null) {
      let interval = max - min; // ms
      if (interval <= 0) {
        interval = 10;
      }
      const factor = interval / this.props.center.width;
      const redrawQueue = {};
      let redrawQueueLength = 0;

      // collect redraw functions
      _forEachInstanceProperty(availableUtils).call(availableUtils, this.itemSet.items, (item, key) => {
        if (item.groupShowing) {
          const returnQueue = true;
          redrawQueue[key] = item.redraw(returnQueue);
          redrawQueueLength = redrawQueue[key].length;
        }
      });
      const needRedraw = redrawQueueLength > 0;
      if (needRedraw) {
        // redraw all regular items
        for (let i = 0; i < redrawQueueLength; i++) {
          _forEachInstanceProperty(availableUtils).call(availableUtils, redrawQueue, fns => {
            fns[i]();
          });
        }
      }

      // calculate the date of the left side and right side of the items given
      _forEachInstanceProperty(availableUtils).call(availableUtils, this.itemSet.items, item => {
        const start = getStart(item);
        const end = getEnd(item);
        let startSide;
        let endSide;
        if (this.options.rtl) {
          startSide = start - (item.getWidthRight() + 10) * factor;
          endSide = end + (item.getWidthLeft() + 10) * factor;
        } else {
          startSide = start - (item.getWidthLeft() + 10) * factor;
          endSide = end + (item.getWidthRight() + 10) * factor;
        }
        if (startSide < min) {
          min = startSide;
          minItem = item;
        }
        if (endSide > max) {
          max = endSide;
          maxItem = item;
        }
      });
      if (minItem && maxItem) {
        const lhs = minItem.getWidthLeft() + 10;
        const rhs = maxItem.getWidthRight() + 10;
        const delta = this.props.center.width - lhs - rhs; // px

        if (delta > 0) {
          if (this.options.rtl) {
            min = getStart(minItem) - rhs * interval / delta; // ms
            max = getEnd(maxItem) + lhs * interval / delta; // ms
          } else {
            min = getStart(minItem) - lhs * interval / delta; // ms
            max = getEnd(maxItem) + rhs * interval / delta; // ms
          }
        }
      }
    }
    return {
      min: min != null ? new Date(min) : null,
      max: max != null ? new Date(max) : null
    };
  }

  /**
   * Calculate the data range of the items start and end dates
   * @returns {{min: Date, max: Date}}
   */
  getDataRange() {
    let min = null;
    let max = null;
    if (this.itemsData) {
      var _context9;
      _forEachInstanceProperty(_context9 = this.itemsData).call(_context9, item => {
        const start = availableUtils.convert(item.start, "Date").valueOf();
        const end = availableUtils.convert(item.end != undefined ? item.end : item.start, "Date").valueOf();
        if (min === null || start < min) {
          min = start;
        }
        if (max === null || end > max) {
          max = end;
        }
      });
    }
    return {
      min: min != null ? new Date(min) : null,
      max: max != null ? new Date(max) : null
    };
  }

  /**
   * Generate Timeline related information from an event
   * @param {Event} event
   * @return {Object} An object with related information, like on which area
   *                  The event happened, whether clicked on an item, etc.
   */
  getEventProperties(event) {
    const clientX = event.center ? event.center.x : event.clientX;
    const clientY = event.center ? event.center.y : event.clientY;
    const centerContainerRect = this.dom.centerContainer.getBoundingClientRect();
    const x = this.options.rtl ? centerContainerRect.right - clientX : clientX - centerContainerRect.left;
    const y = clientY - centerContainerRect.top;
    const item = this.itemSet.itemFromTarget(event);
    const group = this.itemSet.groupFromTarget(event);
    const customTime = CustomTime.customTimeFromTarget(event);
    const snap = this.itemSet.options.snap || null;
    const scale = this.body.util.getScale();
    const step = this.body.util.getStep();
    const time = this._toTime(x);
    const snappedTime = snap ? snap(time, scale, step) : time;
    const element = availableUtils.getTarget(event);
    let what = null;
    if (item != null) {
      what = "item";
    } else if (customTime != null) {
      what = "custom-time";
    } else if (availableUtils.hasParent(element, this.timeAxis.dom.foreground)) {
      what = "axis";
    } else if (this.timeAxis2 && availableUtils.hasParent(element, this.timeAxis2.dom.foreground)) {
      what = "axis";
    } else if (availableUtils.hasParent(element, this.itemSet.dom.labelSet)) {
      what = "group-label";
    } else if (availableUtils.hasParent(element, this.currentTime.bar)) {
      what = "current-time";
    } else if (availableUtils.hasParent(element, this.dom.center)) {
      what = "background";
    }
    return {
      event,
      item: item ? item.id : null,
      isCluster: item ? !!item.isCluster : false,
      items: item ? item.items || [] : null,
      group: group ? group.groupId : null,
      customTime: customTime ? customTime.options.id : null,
      what,
      pageX: event.srcEvent ? event.srcEvent.pageX : event.pageX,
      pageY: event.srcEvent ? event.srcEvent.pageY : event.pageY,
      x,
      y,
      time,
      snappedTime
    };
  }

  /**
   * Toggle Timeline rolling mode
   */
  toggleRollingMode() {
    if (this.range.rolling) {
      this.range.stopRolling();
    } else {
      if (this.options.rollingMode == undefined) {
        this.setOptions(this.options);
      }
      this.range.startRolling();
    }
  }

  /**
   * redraw
   * @private
   */
  _redraw() {
    Core.prototype._redraw.call(this);
  }

  /**
   * on fit callback
   * @param {object} args
   * @private
   */
  _onFit(args) {
    const {
      start,
      end,
      animation
    } = args;
    if (!end) {
      this.moveTo(start.valueOf(), {
        animation
      });
    } else {
      this.range.setRange(start, end, {
        animation: animation
      });
    }
  }
}

/**
 *
 * @param {timeline.Item} item
 * @returns {number}
 */
function getStart(item) {
  return availableUtils.convert(item.data.start, "Date").valueOf();
}

/**
 *
 * @param {timeline.Item} item
 * @returns {number}
 */
function getEnd(item) {
  const end = item.data.end != undefined ? item.data.end : item.data.start;
  return availableUtils.convert(end, "Date").valueOf();
}

/**
 * @param {vis.Timeline} timeline
 * @param {timeline.Item} item
 * @return {{shouldScroll: bool, scrollOffset: number, itemTop: number}}
 */
function getItemVerticalScroll(timeline, item) {
  if (!item.parent) {
    // The item no longer exists, so ignore this focus.
    return false;
  }
  const itemsetHeight = timeline.options.rtl ? timeline.props.rightContainer.height : timeline.props.leftContainer.height;
  const contentHeight = timeline.props.center.height;
  const group = item.parent;
  let offset = group.top;
  let shouldScroll = true;
  const orientation = timeline.timeAxis.options.orientation.axis;
  const itemTop = () => {
    if (orientation == "bottom") {
      return group.height - item.top - item.height;
    } else {
      return item.top;
    }
  };
  const currentScrollHeight = timeline._getScrollTop() * -1;
  const targetOffset = offset + itemTop();
  const height = item.height;
  if (targetOffset < currentScrollHeight) {
    if (offset + itemsetHeight <= offset + itemTop() + height) {
      offset += itemTop() - timeline.itemSet.options.margin.item.vertical;
    }
  } else if (targetOffset + height > currentScrollHeight + itemsetHeight) {
    offset += itemTop() + height - itemsetHeight + timeline.itemSet.options.margin.item.vertical;
  } else {
    shouldScroll = false;
  }
  offset = Math.min(offset, contentHeight - itemsetHeight);
  return {
    shouldScroll,
    scrollOffset: offset,
    itemTop: targetOffset
  };
}

// DOM utility methods

/**
 * this prepares the JSON container for allocating SVG elements
 * @param {Object} JSONcontainer
 * @private
 */
function prepareElements(JSONcontainer) {
  // cleanup the redundant svgElements;
  for (var elementType in JSONcontainer) {
    if (!Object.prototype.hasOwnProperty.call(JSONcontainer, elementType)) continue;
    JSONcontainer[elementType].redundant = JSONcontainer[elementType].used;
    JSONcontainer[elementType].used = [];
  }
}

/**
 * this cleans up all the unused SVG elements. By asking for the parentNode, we only need to supply the JSON container from
 * which to remove the redundant elements.
 *
 * @param {Object} JSONcontainer
 * @private
 */
function cleanupElements(JSONcontainer) {
  // cleanup the redundant svgElements;
  for (var elementType in JSONcontainer) {
    if (!Object.prototype.hasOwnProperty.call(JSONcontainer, elementType)) continue;
    const elementTypeJsonContainer = JSONcontainer[elementType];
    for (var i = 0; i < elementTypeJsonContainer.redundant.length; i++) {
      elementTypeJsonContainer.redundant[i].parentNode.removeChild(elementTypeJsonContainer.redundant[i]);
    }
    elementTypeJsonContainer.redundant = [];
  }
}

/**
 * Ensures that all elements are removed first up so they can be recreated cleanly
 * @param {Object} JSONcontainer
 */
function resetElements(JSONcontainer) {
  prepareElements(JSONcontainer);
  cleanupElements(JSONcontainer);
  prepareElements(JSONcontainer);
}

/**
 * Allocate or generate an SVG element if needed. Store a reference to it in the JSON container and draw it in the svgContainer
 * the JSON container and the SVG container have to be supplied so other svg containers (like the legend) can use this.
 *
 * @param {string} elementType
 * @param {Object} JSONcontainer
 * @param {Object} svgContainer
 * @returns {Element}
 * @private
 */
function getSVGElement(elementType, JSONcontainer, svgContainer) {
  var element;
  // allocate SVG element, if it doesnt yet exist, create one.
  if (Object.prototype.hasOwnProperty.call(JSONcontainer, elementType)) {
    // this element has been created before
    // check if there is an redundant element
    if (JSONcontainer[elementType].redundant.length > 0) {
      element = JSONcontainer[elementType].redundant[0];
      JSONcontainer[elementType].redundant.shift();
    } else {
      // create a new element and add it to the SVG
      element = document.createElementNS("http://www.w3.org/2000/svg", elementType);
      svgContainer.appendChild(element);
    }
  } else {
    // create a new element and add it to the SVG, also create a new object in the svgElements to keep track of it.
    element = document.createElementNS("http://www.w3.org/2000/svg", elementType);
    JSONcontainer[elementType] = {
      used: [],
      redundant: []
    };
    svgContainer.appendChild(element);
  }
  JSONcontainer[elementType].used.push(element);
  return element;
}

/**
 * Allocate or generate an SVG element if needed. Store a reference to it in the JSON container and draw it in the svgContainer
 * the JSON container and the SVG container have to be supplied so other svg containers (like the legend) can use this.
 *
 * @param {string} elementType
 * @param {Object} JSONcontainer
 * @param {Element} DOMContainer
 * @param {Element} insertBefore
 * @returns {*}
 */
function getDOMElement(elementType, JSONcontainer, DOMContainer, insertBefore) {
  var element;
  // allocate DOM element, if it doesnt yet exist, create one.
  if (Object.prototype.hasOwnProperty.call(JSONcontainer, elementType)) {
    // this element has been created before
    // check if there is an redundant element
    if (JSONcontainer[elementType].redundant.length > 0) {
      element = JSONcontainer[elementType].redundant[0];
      JSONcontainer[elementType].redundant.shift();
    } else {
      // create a new element and add it to the SVG
      element = document.createElement(elementType);
      {
        DOMContainer.appendChild(element);
      }
    }
  } else {
    // create a new element and add it to the SVG, also create a new object in the svgElements to keep track of it.
    element = document.createElement(elementType);
    JSONcontainer[elementType] = {
      used: [],
      redundant: []
    };
    {
      DOMContainer.appendChild(element);
    }
  }
  JSONcontainer[elementType].used.push(element);
  return element;
}

/**
 * Draw a point object. This is a separate function because it can also be called by the legend.
 * The reason the JSONcontainer and the target SVG svgContainer have to be supplied is so the legend can use these functions
 * as well.
 *
 * @param {number} x
 * @param {number} y
 * @param {Object} groupTemplate: A template containing the necessary information to draw the datapoint e.g., {style: 'circle', size: 5, className: 'className' }
 * @param {Object} JSONcontainer
 * @param {Object} svgContainer
 * @param {Object} labelObj
 * @returns {vis.PointItem}
 */
function drawPoint(x, y, groupTemplate, JSONcontainer, svgContainer, labelObj) {
  var point;
  if (groupTemplate.style == "circle") {
    point = getSVGElement("circle", JSONcontainer, svgContainer);
    point.setAttributeNS(null, "cx", x);
    point.setAttributeNS(null, "cy", y);
    point.setAttributeNS(null, "r", 0.5 * groupTemplate.size);
  } else {
    point = getSVGElement("rect", JSONcontainer, svgContainer);
    point.setAttributeNS(null, "x", x - 0.5 * groupTemplate.size);
    point.setAttributeNS(null, "y", y - 0.5 * groupTemplate.size);
    point.setAttributeNS(null, "width", groupTemplate.size);
    point.setAttributeNS(null, "height", groupTemplate.size);
  }
  if (groupTemplate.styles !== undefined) {
    point.setAttributeNS(null, "style", groupTemplate.styles);
  }
  point.setAttributeNS(null, "class", groupTemplate.className + " vis-point");
  //handle label

  if (labelObj) {
    var label = getSVGElement("text", JSONcontainer, svgContainer);
    if (labelObj.xOffset) {
      x = x + labelObj.xOffset;
    }
    if (labelObj.yOffset) {
      y = y + labelObj.yOffset;
    }
    if (labelObj.content) {
      label.textContent = labelObj.content;
    }
    if (labelObj.className) {
      label.setAttributeNS(null, "class", labelObj.className + " vis-label");
    }
    label.setAttributeNS(null, "x", x);
    label.setAttributeNS(null, "y", y);
  }
  return point;
}

/**
 * draw a bar SVG element centered on the X coordinate
 *
 * @param {number} x
 * @param {number} y
 * @param {number} width
 * @param {number} height
 * @param {string} className
 * @param {Object} JSONcontainer
 * @param {Object} svgContainer
 * @param {string} style
 */
function drawBar(x, y, width, height, className, JSONcontainer, svgContainer, style) {
  if (height != 0) {
    if (height < 0) {
      height *= -1;
      y -= height;
    }
    var rect = getSVGElement("rect", JSONcontainer, svgContainer);
    rect.setAttributeNS(null, "x", x - 0.5 * width);
    rect.setAttributeNS(null, "y", y);
    rect.setAttributeNS(null, "width", width);
    rect.setAttributeNS(null, "height", height);
    rect.setAttributeNS(null, "class", className);
    if (style) {
      rect.setAttributeNS(null, "style", style);
    }
  }
}

/**
 * get default language
 * @returns {string}
 */
function getNavigatorLanguage() {
  try {
    if (!navigator) return "en";
    if (navigator.languages && navigator.languages.length) {
      return navigator.languages;
    } else {
      return navigator.userLanguage || navigator.language || navigator.browserLanguage || "en";
    }
  } catch (error) {
    return "en";
  }
}

/** DataScale */
class DataScale {
  /**
   *
   * @param {number} start
   * @param {number} end
   * @param {boolean} autoScaleStart
   * @param {boolean} autoScaleEnd
   * @param {number} containerHeight
   * @param {number} majorCharHeight
   * @param {boolean} zeroAlign
   * @param {function} formattingFunction
   * @constructor DataScale
   */
  constructor(start, end, autoScaleStart, autoScaleEnd, containerHeight, majorCharHeight) {
    let zeroAlign = arguments.length > 6 && arguments[6] !== undefined ? arguments[6] : false;
    let formattingFunction = arguments.length > 7 && arguments[7] !== undefined ? arguments[7] : false;
    this.majorSteps = [1, 2, 5, 10];
    this.minorSteps = [0.25, 0.5, 1, 2];
    this.customLines = null;
    this.containerHeight = containerHeight;
    this.majorCharHeight = majorCharHeight;
    this._start = start;
    this._end = end;
    this.scale = 1;
    this.minorStepIdx = -1;
    this.magnitudefactor = 1;
    this.determineScale();
    this.zeroAlign = zeroAlign;
    this.autoScaleStart = autoScaleStart;
    this.autoScaleEnd = autoScaleEnd;
    this.formattingFunction = formattingFunction;
    if (autoScaleStart || autoScaleEnd) {
      const me = this;
      const roundToMinor = value => {
        const rounded = value - value % (me.magnitudefactor * me.minorSteps[me.minorStepIdx]);
        if (value % (me.magnitudefactor * me.minorSteps[me.minorStepIdx]) > 0.5 * (me.magnitudefactor * me.minorSteps[me.minorStepIdx])) {
          return rounded + me.magnitudefactor * me.minorSteps[me.minorStepIdx];
        } else {
          return rounded;
        }
      };
      if (autoScaleStart) {
        this._start -= this.magnitudefactor * 2 * this.minorSteps[this.minorStepIdx];
        this._start = roundToMinor(this._start);
      }
      if (autoScaleEnd) {
        this._end += this.magnitudefactor * this.minorSteps[this.minorStepIdx];
        this._end = roundToMinor(this._end);
      }
      this.determineScale();
    }
  }

  /**
   * set chart height
   * @param {number} majorCharHeight
   */
  setCharHeight(majorCharHeight) {
    this.majorCharHeight = majorCharHeight;
  }

  /**
   * set height
   * @param {number} containerHeight
   */
  setHeight(containerHeight) {
    this.containerHeight = containerHeight;
  }

  /**
   * determine scale
   */
  determineScale() {
    const range = this._end - this._start;
    this.scale = this.containerHeight / range;
    const minimumStepValue = this.majorCharHeight / this.scale;
    const orderOfMagnitude = range > 0 ? Math.round(Math.log(range) / Math.LN10) : 0;
    this.minorStepIdx = -1;
    this.magnitudefactor = Math.pow(10, orderOfMagnitude);
    let start = 0;
    if (orderOfMagnitude < 0) {
      start = orderOfMagnitude;
    }
    let solutionFound = false;
    for (let l = start; Math.abs(l) <= Math.abs(orderOfMagnitude); l++) {
      this.magnitudefactor = Math.pow(10, l);
      for (let j = 0; j < this.minorSteps.length; j++) {
        const stepSize = this.magnitudefactor * this.minorSteps[j];
        if (stepSize >= minimumStepValue) {
          solutionFound = true;
          this.minorStepIdx = j;
          break;
        }
      }
      if (solutionFound === true) {
        break;
      }
    }
  }

  /**
   * returns if value is major
   * @param {number} value
   * @returns {boolean}
   */
  is_major(value) {
    return value % (this.magnitudefactor * this.majorSteps[this.minorStepIdx]) === 0;
  }

  /**
   * returns step size
   * @returns {number}
   */
  getStep() {
    return this.magnitudefactor * this.minorSteps[this.minorStepIdx];
  }

  /**
   * returns first major
   * @returns {number}
   */
  getFirstMajor() {
    const majorStep = this.magnitudefactor * this.majorSteps[this.minorStepIdx];
    return this.convertValue(this._start + (majorStep - this._start % majorStep) % majorStep);
  }

  /**
   * returns first major
   * @param {date} current
   * @returns {date} formatted date
   */
  formatValue(current) {
    let returnValue = current.toPrecision(5);
    if (typeof this.formattingFunction === "function") {
      returnValue = this.formattingFunction(current);
    }
    if (typeof returnValue === "number") {
      return "".concat(returnValue);
    } else if (typeof returnValue === "string") {
      return returnValue;
    } else {
      return current.toPrecision(5);
    }
  }

  /**
   * returns lines
   * @returns {object} lines
   */
  getLines() {
    const lines = [];
    const step = this.getStep();
    const bottomOffset = (step - this._start % step) % step;
    for (let i = this._start + bottomOffset; this._end - i > 0.00001; i += step) {
      if (i != this._start) {
        //Skip the bottom line
        lines.push({
          major: this.is_major(i),
          y: this.convertValue(i),
          val: this.formatValue(i)
        });
      }
    }
    return lines;
  }

  /**
   * follow scale
   * @param {object} other
   */
  followScale(other) {
    const oldStepIdx = this.minorStepIdx;
    const oldStart = this._start;
    const oldEnd = this._end;
    const me = this;
    const increaseMagnitude = () => {
      me.magnitudefactor *= 2;
    };
    const decreaseMagnitude = () => {
      me.magnitudefactor /= 2;
    };
    if (other.minorStepIdx <= 1 && this.minorStepIdx <= 1 || other.minorStepIdx > 1 && this.minorStepIdx > 1) ; else if (other.minorStepIdx < this.minorStepIdx) {
      //I'm 5, they are 4 per major.
      this.minorStepIdx = 1;
      if (oldStepIdx == 2) {
        increaseMagnitude();
      } else {
        increaseMagnitude();
        increaseMagnitude();
      }
    } else {
      //I'm 4, they are 5 per major
      this.minorStepIdx = 2;
      if (oldStepIdx == 1) {
        decreaseMagnitude();
      } else {
        decreaseMagnitude();
        decreaseMagnitude();
      }
    }

    //Get masters stats:
    const otherZero = other.convertValue(0);
    const otherStep = other.getStep() * other.scale;
    let done = false;
    let count = 0;
    //Loop until magnitude is correct for given constrains.
    while (!done && count++ < 5) {
      //Get my stats:
      this.scale = otherStep / (this.minorSteps[this.minorStepIdx] * this.magnitudefactor);
      const newRange = this.containerHeight / this.scale;

      //For the case the magnitudefactor has changed:
      this._start = oldStart;
      this._end = this._start + newRange;
      const myOriginalZero = this._end * this.scale;
      const majorStep = this.magnitudefactor * this.majorSteps[this.minorStepIdx];
      const majorOffset = this.getFirstMajor() - other.getFirstMajor();
      if (this.zeroAlign) {
        const zeroOffset = otherZero - myOriginalZero;
        this._end += zeroOffset / this.scale;
        this._start = this._end - newRange;
      } else {
        if (!this.autoScaleStart) {
          this._start += majorStep - majorOffset / this.scale;
          this._end = this._start + newRange;
        } else {
          this._start -= majorOffset / this.scale;
          this._end = this._start + newRange;
        }
      }
      if (!this.autoScaleEnd && this._end > oldEnd + 0.00001) {
        //Need to decrease magnitude to prevent scale overshoot! (end)
        decreaseMagnitude();
        done = false;
        continue;
      }
      if (!this.autoScaleStart && this._start < oldStart - 0.00001) {
        if (this.zeroAlign && oldStart >= 0) {
          console.warn("Can't adhere to given 'min' range, due to zeroalign");
        } else {
          //Need to decrease magnitude to prevent scale overshoot! (start)
          decreaseMagnitude();
          done = false;
          continue;
        }
      }
      if (this.autoScaleStart && this.autoScaleEnd && newRange < oldEnd - oldStart) {
        increaseMagnitude();
        done = false;
        continue;
      }
      done = true;
    }
  }

  /**
   * convert value
   * @param {number} value
   * @returns {number}
   */
  convertValue(value) {
    return this.containerHeight - (value - this._start) * this.scale;
  }

  /**
   * returns screen to value
   * @param {number} pixels
   * @returns {number}
   */
  screenToValue(pixels) {
    return (this.containerHeight - pixels) / this.scale + this._start;
  }
}

/** A horizontal time axis */
class DataAxis extends Component {
  /**
   * @param {Object} body
   * @param {Object} [options]        See DataAxis.setOptions for the available
   *                                  options.
   * @param {SVGElement} svg
   * @param {timeline.LineGraph.options} linegraphOptions
   * @constructor DataAxis
   * @extends Component
   */
  constructor(body, options, svg, linegraphOptions) {
    super();
    this.id = v4();
    this.body = body;
    this.defaultOptions = {
      orientation: "left",
      // supported: 'left', 'right'
      showMinorLabels: true,
      showMajorLabels: true,
      showWeekScale: false,
      icons: false,
      majorLinesOffset: 7,
      minorLinesOffset: 4,
      labelOffsetX: 10,
      labelOffsetY: 2,
      iconWidth: 20,
      width: "40px",
      visible: true,
      alignZeros: true,
      left: {
        range: {
          min: undefined,
          max: undefined
        },
        format(value) {
          return "".concat(_parseFloat(value.toPrecision(3)));
        },
        title: {
          text: undefined,
          style: undefined
        }
      },
      right: {
        range: {
          min: undefined,
          max: undefined
        },
        format(value) {
          return "".concat(_parseFloat(value.toPrecision(3)));
        },
        title: {
          text: undefined,
          style: undefined
        }
      }
    };
    this.linegraphOptions = linegraphOptions;
    this.linegraphSVG = svg;
    this.props = {};
    this.DOMelements = {
      // dynamic elements
      lines: {},
      labels: {},
      title: {}
    };
    this.dom = {};
    this.scale = undefined;
    this.range = {
      start: 0,
      end: 0
    };
    this.options = availableUtils.extend({}, this.defaultOptions);
    this.conversionFactor = 1;
    this.setOptions(options);
    this.width = Number("".concat(this.options.width).replace("px", ""));
    this.minWidth = this.width;
    this.height = this.linegraphSVG.getBoundingClientRect().height;
    this.hidden = false;
    this.stepPixels = 25;
    this.zeroCrossing = -1;
    this.amountOfSteps = -1;
    this.lineOffset = 0;
    this.master = true;
    this.masterAxis = null;
    this.svgElements = {};
    this.iconsRemoved = false;
    this.groups = {};
    this.amountOfGroups = 0;

    // create the HTML DOM
    this._create();
    if (this.scale == undefined) {
      this._redrawLabels();
    }
    this.framework = {
      svg: this.svg,
      svgElements: this.svgElements,
      options: this.options,
      groups: this.groups
    };
    const me = this;
    this.body.emitter.on("verticalDrag", () => {
      me.dom.lineContainer.style.top = "".concat(me.body.domProps.scrollTop, "px");
    });
  }

  /**
   * Adds group to data axis
   * @param {string} label
   * @param {object} graphOptions
   */
  addGroup(label, graphOptions) {
    if (!Object.prototype.hasOwnProperty.call(this.groups, label)) {
      this.groups[label] = graphOptions;
    }
    this.amountOfGroups += 1;
  }

  /**
   * updates group of data axis
   * @param {string} label
   * @param {object} graphOptions
   */
  updateGroup(label, graphOptions) {
    if (!Object.prototype.hasOwnProperty.call(this.groups, label)) {
      this.amountOfGroups += 1;
    }
    this.groups[label] = graphOptions;
  }

  /**
   * removes group of data axis
   * @param {string} label
   */
  removeGroup(label) {
    if (Object.prototype.hasOwnProperty.call(this.groups, label)) {
      delete this.groups[label];
      this.amountOfGroups -= 1;
    }
  }

  /**
   * sets options
   * @param {object} options
   */
  setOptions(options) {
    if (options) {
      let redraw = false;
      if (this.options.orientation != options.orientation && options.orientation !== undefined) {
        redraw = true;
      }
      const fields = ["orientation", "showMinorLabels", "showMajorLabels", "icons", "majorLinesOffset", "minorLinesOffset", "labelOffsetX", "labelOffsetY", "iconWidth", "width", "visible", "left", "right", "alignZeros"];
      availableUtils.selectiveDeepExtend(fields, this.options, options);
      this.minWidth = Number("".concat(this.options.width).replace("px", ""));
      if (redraw === true && this.dom.frame) {
        this.hide();
        this.show();
      }
    }
  }

  /**
   * Create the HTML DOM for the DataAxis
   */
  _create() {
    this.dom.frame = document.createElement("div");
    this.dom.frame.style.width = this.options.width;
    this.dom.frame.style.height = this.height;
    this.dom.lineContainer = document.createElement("div");
    this.dom.lineContainer.style.width = "100%";
    this.dom.lineContainer.style.height = this.height;
    this.dom.lineContainer.style.position = "relative";
    this.dom.lineContainer.style.visibility = "visible";
    this.dom.lineContainer.style.display = "block";

    // create svg element for graph drawing.
    this.svg = document.createElementNS("http://www.w3.org/2000/svg", "svg");
    this.svg.style.position = "absolute";
    this.svg.style.top = "0px";
    this.svg.style.height = "100%";
    this.svg.style.width = "100%";
    this.svg.style.display = "block";
    this.dom.frame.appendChild(this.svg);
  }

  /**
   * redraws groups icons
   */
  _redrawGroupIcons() {
    prepareElements(this.svgElements);
    let x;
    const iconWidth = this.options.iconWidth;
    const iconHeight = 15;
    const iconOffset = 4;
    let y = iconOffset + 0.5 * iconHeight;
    if (this.options.orientation === "left") {
      x = iconOffset;
    } else {
      x = this.width - iconWidth - iconOffset;
    }
    const groupArray = _Object$keys(this.groups);
    _sortInstanceProperty(groupArray).call(groupArray, (a, b) => a < b ? -1 : 1);
    for (const groupId of groupArray) {
      if (this.groups[groupId].visible === true && (this.linegraphOptions.visibility[groupId] === undefined || this.linegraphOptions.visibility[groupId] === true)) {
        this.groups[groupId].getLegend(iconWidth, iconHeight, this.framework, x, y);
        y += iconHeight + iconOffset;
      }
    }
    cleanupElements(this.svgElements);
    this.iconsRemoved = false;
  }

  /**
   * Cleans up icons
   */
  _cleanupIcons() {
    if (this.iconsRemoved === false) {
      prepareElements(this.svgElements);
      cleanupElements(this.svgElements);
      this.iconsRemoved = true;
    }
  }

  /**
   * Create the HTML DOM for the DataAxis
   */
  show() {
    this.hidden = false;
    if (!this.dom.frame.parentNode) {
      if (this.options.orientation === "left") {
        this.body.dom.left.appendChild(this.dom.frame);
      } else {
        this.body.dom.right.appendChild(this.dom.frame);
      }
    }
    if (!this.dom.lineContainer.parentNode) {
      this.body.dom.backgroundHorizontal.appendChild(this.dom.lineContainer);
    }
    this.dom.lineContainer.style.display = "block";
  }

  /**
   * Create the HTML DOM for the DataAxis
   */
  hide() {
    this.hidden = true;
    if (this.dom.frame.parentNode) {
      this.dom.frame.parentNode.removeChild(this.dom.frame);
    }
    this.dom.lineContainer.style.display = "none";
  }

  /**
   * Set a range (start and end)
   * @param {number} start
   * @param {number} end
   */
  setRange(start, end) {
    this.range.start = start;
    this.range.end = end;
  }

  /**
   * Repaint the component
   * @return {boolean} Returns true if the component is resized
   */
  redraw() {
    let resized = false;
    let activeGroups = 0;

    // Make sure the line container adheres to the vertical scrolling.
    this.dom.lineContainer.style.top = "".concat(this.body.domProps.scrollTop, "px");
    for (const groupId in this.groups) {
      if (!Object.prototype.hasOwnProperty.call(this.groups, groupId)) continue;
      if (this.groups[groupId].visible === true && (this.linegraphOptions.visibility[groupId] === undefined || this.linegraphOptions.visibility[groupId] === true)) activeGroups++;
    }
    if (this.amountOfGroups === 0 || activeGroups === 0) {
      this.hide();
    } else {
      this.show();
      this.height = Number(this.linegraphSVG.style.height.replace("px", ""));

      // svg offsetheight did not work in firefox and explorer...
      this.dom.lineContainer.style.height = "".concat(this.height, "px");
      this.width = this.options.visible === true ? Number("".concat(this.options.width).replace("px", "")) : 0;
      const props = this.props;
      const frame = this.dom.frame;

      // update classname
      frame.className = "vis-data-axis";

      // calculate character width and height
      this._calculateCharSize();
      const orientation = this.options.orientation;
      const showMinorLabels = this.options.showMinorLabels;
      const showMajorLabels = this.options.showMajorLabels;
      const backgroundHorizontalOffsetWidth = this.body.dom.backgroundHorizontal.offsetWidth;

      // determine the width and height of the elements for the axis
      props.minorLabelHeight = showMinorLabels ? props.minorCharHeight : 0;
      props.majorLabelHeight = showMajorLabels ? props.majorCharHeight : 0;
      props.minorLineWidth = backgroundHorizontalOffsetWidth - this.lineOffset - this.width + 2 * this.options.minorLinesOffset;
      props.minorLineHeight = 1;
      props.majorLineWidth = backgroundHorizontalOffsetWidth - this.lineOffset - this.width + 2 * this.options.majorLinesOffset;
      props.majorLineHeight = 1;

      //  take frame offline while updating (is almost twice as fast)
      if (orientation === "left") {
        frame.style.top = "0";
        frame.style.left = "0";
        frame.style.bottom = "";
        frame.style.width = "".concat(this.width, "px");
        frame.style.height = "".concat(this.height, "px");
        this.props.width = this.body.domProps.left.width;
        this.props.height = this.body.domProps.left.height;
      } else {
        // right
        frame.style.top = "";
        frame.style.bottom = "0";
        frame.style.left = "0";
        frame.style.width = "".concat(this.width, "px");
        frame.style.height = "".concat(this.height, "px");
        this.props.width = this.body.domProps.right.width;
        this.props.height = this.body.domProps.right.height;
      }
      resized = this._redrawLabels();
      resized = this._isResized() || resized;
      if (this.options.icons === true) {
        this._redrawGroupIcons();
      } else {
        this._cleanupIcons();
      }
      this._redrawTitle(orientation);
    }
    return resized;
  }

  /**
   * Repaint major and minor text labels and vertical grid lines
   *
   * @returns {boolean}
   * @private
   */
  _redrawLabels() {
    let resized = false;
    prepareElements(this.DOMelements.lines);
    prepareElements(this.DOMelements.labels);
    const orientation = this.options["orientation"];
    const customRange = this.options[orientation].range != undefined ? this.options[orientation].range : {};

    //Override range with manual options:
    let autoScaleEnd = true;
    if (customRange.max != undefined) {
      this.range.end = customRange.max;
      autoScaleEnd = false;
    }
    let autoScaleStart = true;
    if (customRange.min != undefined) {
      this.range.start = customRange.min;
      autoScaleStart = false;
    }
    this.scale = new DataScale(this.range.start, this.range.end, autoScaleStart, autoScaleEnd, this.dom.frame.offsetHeight, this.props.majorCharHeight, this.options.alignZeros, this.options[orientation].format);
    if (this.master === false && this.masterAxis != undefined) {
      this.scale.followScale(this.masterAxis.scale);
      this.dom.lineContainer.style.display = "none";
    } else {
      this.dom.lineContainer.style.display = "block";
    }

    //Is updated in side-effect of _redrawLabel():
    this.maxLabelSize = 0;
    const lines = this.scale.getLines();
    _forEachInstanceProperty(lines).call(lines, line => {
      const y = line.y;
      const isMajor = line.major;
      if (this.options["showMinorLabels"] && isMajor === false) {
        this._redrawLabel(y - 2, line.val, orientation, "vis-y-axis vis-minor", this.props.minorCharHeight);
      }
      if (isMajor) {
        if (y >= 0) {
          this._redrawLabel(y - 2, line.val, orientation, "vis-y-axis vis-major", this.props.majorCharHeight);
        }
      }
      if (this.master === true) {
        if (isMajor) {
          this._redrawLine(y, orientation, "vis-grid vis-horizontal vis-major", this.options.majorLinesOffset, this.props.majorLineWidth);
        } else {
          this._redrawLine(y, orientation, "vis-grid vis-horizontal vis-minor", this.options.minorLinesOffset, this.props.minorLineWidth);
        }
      }
    });

    // Note that title is rotated, so we're using the height, not width!
    let titleWidth = 0;
    if (this.options[orientation].title !== undefined && this.options[orientation].title.text !== undefined) {
      titleWidth = this.props.titleCharHeight;
    }
    const offset = this.options.icons === true ? Math.max(this.options.iconWidth, titleWidth) + this.options.labelOffsetX + 15 : titleWidth + this.options.labelOffsetX + 15;

    // this will resize the yAxis to accommodate the labels.
    if (this.maxLabelSize > this.width - offset && this.options.visible === true) {
      this.width = this.maxLabelSize + offset;
      this.options.width = "".concat(this.width, "px");
      cleanupElements(this.DOMelements.lines);
      cleanupElements(this.DOMelements.labels);
      this.redraw();
      resized = true;
    }
    // this will resize the yAxis if it is too big for the labels.
    else if (this.maxLabelSize < this.width - offset && this.options.visible === true && this.width > this.minWidth) {
      this.width = Math.max(this.minWidth, this.maxLabelSize + offset);
      this.options.width = "".concat(this.width, "px");
      cleanupElements(this.DOMelements.lines);
      cleanupElements(this.DOMelements.labels);
      this.redraw();
      resized = true;
    } else {
      cleanupElements(this.DOMelements.lines);
      cleanupElements(this.DOMelements.labels);
      resized = false;
    }
    return resized;
  }

  /**
   * converts value
   * @param {number} value
   * @returns {number} converted number
   */
  convertValue(value) {
    return this.scale.convertValue(value);
  }

  /**
   * converts value
   * @param {number} x
   * @returns {number} screen value
   */
  screenToValue(x) {
    return this.scale.screenToValue(x);
  }

  /**
   * Create a label for the axis at position x
   *
   * @param {number} y
   * @param {string} text
   * @param {'top'|'right'|'bottom'|'left'} orientation
   * @param {string} className
   * @param {number} characterHeight
   * @private
   */
  _redrawLabel(y, text, orientation, className, characterHeight) {
    // reuse redundant label
    const label = getDOMElement("div", this.DOMelements.labels, this.dom.frame); //this.dom.redundant.labels.shift();
    label.className = className;
    label.innerHTML = availableUtils.xss(text);
    if (orientation === "left") {
      label.style.left = "-".concat(this.options.labelOffsetX, "px");
      label.style.textAlign = "right";
    } else {
      label.style.right = "-".concat(this.options.labelOffsetX, "px");
      label.style.textAlign = "left";
    }
    label.style.top = "".concat(y - 0.5 * characterHeight + this.options.labelOffsetY, "px");
    text += "";
    const largestWidth = Math.max(this.props.majorCharWidth, this.props.minorCharWidth);
    if (this.maxLabelSize < text.length * largestWidth) {
      this.maxLabelSize = text.length * largestWidth;
    }
  }

  /**
   * Create a minor line for the axis at position y
   * @param {number} y
   * @param {'top'|'right'|'bottom'|'left'} orientation
   * @param {string} className
   * @param {number} offset
   * @param {number} width
   */
  _redrawLine(y, orientation, className, offset, width) {
    if (this.master === true) {
      const line = getDOMElement("div", this.DOMelements.lines, this.dom.lineContainer); //this.dom.redundant.lines.shift();
      line.className = className;
      line.innerHTML = "";
      if (orientation === "left") {
        line.style.left = "".concat(this.width - offset, "px");
      } else {
        line.style.right = "".concat(this.width - offset, "px");
      }
      line.style.width = "".concat(width, "px");
      line.style.top = "".concat(y, "px");
    }
  }

  /**
   * Create a title for the axis
   * @private
   * @param {'top'|'right'|'bottom'|'left'} orientation
   */
  _redrawTitle(orientation) {
    prepareElements(this.DOMelements.title);

    // Check if the title is defined for this axes
    if (this.options[orientation].title !== undefined && this.options[orientation].title.text !== undefined) {
      const title = getDOMElement("div", this.DOMelements.title, this.dom.frame);
      title.className = "vis-y-axis vis-title vis-".concat(orientation);
      title.innerHTML = availableUtils.xss(this.options[orientation].title.text);

      // Add style - if provided
      if (this.options[orientation].title.style !== undefined) {
        availableUtils.addCssText(title, this.options[orientation].title.style);
      }
      if (orientation === "left") {
        title.style.left = "".concat(this.props.titleCharHeight, "px");
      } else {
        title.style.right = "".concat(this.props.titleCharHeight, "px");
      }
      title.style.width = "".concat(this.height, "px");
    }

    // we need to clean up in case we did not use all elements.
    cleanupElements(this.DOMelements.title);
  }

  /**
   * Determine the size of text on the axis (both major and minor axis).
   * The size is calculated only once and then cached in this.props.
   * @private
   */
  _calculateCharSize() {
    // determine the char width and height on the minor axis
    if (!("minorCharHeight" in this.props)) {
      const textMinor = document.createTextNode("0");
      const measureCharMinor = document.createElement("div");
      measureCharMinor.className = "vis-y-axis vis-minor vis-measure";
      measureCharMinor.appendChild(textMinor);
      this.dom.frame.appendChild(measureCharMinor);
      this.props.minorCharHeight = measureCharMinor.clientHeight;
      this.props.minorCharWidth = measureCharMinor.clientWidth;
      this.dom.frame.removeChild(measureCharMinor);
    }
    if (!("majorCharHeight" in this.props)) {
      const textMajor = document.createTextNode("0");
      const measureCharMajor = document.createElement("div");
      measureCharMajor.className = "vis-y-axis vis-major vis-measure";
      measureCharMajor.appendChild(textMajor);
      this.dom.frame.appendChild(measureCharMajor);
      this.props.majorCharHeight = measureCharMajor.clientHeight;
      this.props.majorCharWidth = measureCharMajor.clientWidth;
      this.dom.frame.removeChild(measureCharMajor);
    }
    if (!("titleCharHeight" in this.props)) {
      const textTitle = document.createTextNode("0");
      const measureCharTitle = document.createElement("div");
      measureCharTitle.className = "vis-y-axis vis-title vis-measure";
      measureCharTitle.appendChild(textTitle);
      this.dom.frame.appendChild(measureCharTitle);
      this.props.titleCharHeight = measureCharTitle.clientHeight;
      this.props.titleCharWidth = measureCharTitle.clientWidth;
      this.dom.frame.removeChild(measureCharTitle);
    }
  }
}

/**
 *
 *
 * @constructor Points
 */
function Points() {}

/**
 * draw the data points
 *
 * @param {Array} dataset
 * @param {GraphGroup} group
 * @param {Object} framework            | SVG DOM element
 * @param {number} [offset]
 */
Points.draw = function (dataset, group, framework, offset) {
  offset = offset || 0;
  var callback = getCallback(framework, group);
  for (var i = 0; i < dataset.length; i++) {
    if (!callback) {
      // draw the point the simple way.
      drawPoint(dataset[i].screen_x + offset, dataset[i].screen_y, getGroupTemplate(group), framework.svgElements, framework.svg, dataset[i].label);
    } else {
      var callbackResult = callback(dataset[i], group); // result might be true, false or an object
      if (callbackResult === true || typeof callbackResult === "object") {
        drawPoint(dataset[i].screen_x + offset, dataset[i].screen_y, getGroupTemplate(group, callbackResult), framework.svgElements, framework.svg, dataset[i].label);
      }
    }
  }
};
Points.drawIcon = function (group, x, y, iconWidth, iconHeight, framework) {
  var fillHeight = iconHeight * 0.5;
  var outline = getSVGElement("rect", framework.svgElements, framework.svg);
  outline.setAttributeNS(null, "x", x);
  outline.setAttributeNS(null, "y", y - fillHeight);
  outline.setAttributeNS(null, "width", iconWidth);
  outline.setAttributeNS(null, "height", 2 * fillHeight);
  outline.setAttributeNS(null, "class", "vis-outline");

  //Don't call callback on icon
  drawPoint(x + 0.5 * iconWidth, y, getGroupTemplate(group), framework.svgElements, framework.svg);
};

/**
 *
 * @param {vis.Group} group
 * @param {any} callbackResult
 * @returns {{style: *, styles: (*|string), size: *, className: *}}
 */
function getGroupTemplate(group, callbackResult) {
  callbackResult = typeof callbackResult === "undefined" ? {} : callbackResult;
  return {
    style: callbackResult.style || group.options.drawPoints.style,
    styles: callbackResult.styles || group.options.drawPoints.styles,
    size: callbackResult.size || group.options.drawPoints.size,
    className: callbackResult.className || group.className
  };
}

/**
 *
 * @param {Object} framework            | SVG DOM element
 * @param {vis.Group} group
 * @returns {function}
 */
function getCallback(framework, group) {
  var callback = undefined;
  // check for the graph2d onRender
  if (framework.options && framework.options.drawPoints && framework.options.drawPoints.onRender && typeof framework.options.drawPoints.onRender == "function") {
    callback = framework.options.drawPoints.onRender;
  }

  // override it with the group onRender if defined
  if (group.group.options && group.group.options.drawPoints && group.group.options.drawPoints.onRender && typeof group.group.options.drawPoints.onRender == "function") {
    callback = group.group.options.drawPoints.onRender;
  }
  return callback;
}

/**
 *
 * @constructor Bargraph
 */
function Bargraph() {}
Bargraph.drawIcon = function (group, x, y, iconWidth, iconHeight, framework) {
  var fillHeight = iconHeight * 0.5;
  var outline = getSVGElement("rect", framework.svgElements, framework.svg);
  outline.setAttributeNS(null, "x", x);
  outline.setAttributeNS(null, "y", y - fillHeight);
  outline.setAttributeNS(null, "width", iconWidth);
  outline.setAttributeNS(null, "height", 2 * fillHeight);
  outline.setAttributeNS(null, "class", "vis-outline");
  var barWidth = Math.round(0.3 * iconWidth);
  var originalWidth = group.options.barChart.width;
  var scale = originalWidth / barWidth;
  var bar1Height = Math.round(0.4 * iconHeight);
  var bar2Height = Math.round(0.75 * iconHeight);
  var offset = Math.round((iconWidth - 2 * barWidth) / 3);
  drawBar(x + 0.5 * barWidth + offset, y + fillHeight - bar1Height - 1, barWidth, bar1Height, group.className + " vis-bar", framework.svgElements, framework.svg, group.style);
  drawBar(x + 1.5 * barWidth + offset + 2, y + fillHeight - bar2Height - 1, barWidth, bar2Height, group.className + " vis-bar", framework.svgElements, framework.svg, group.style);
  if (group.options.drawPoints.enabled == true) {
    var groupTemplate = {
      style: group.options.drawPoints.style,
      styles: group.options.drawPoints.styles,
      size: group.options.drawPoints.size / scale,
      className: group.className
    };
    drawPoint(x + 0.5 * barWidth + offset, y + fillHeight - bar1Height - 1, groupTemplate, framework.svgElements, framework.svg);
    drawPoint(x + 1.5 * barWidth + offset + 2, y + fillHeight - bar2Height - 1, groupTemplate, framework.svgElements, framework.svg);
  }
};

/**
 * draw a bar graph
 *
 * @param {Array.<vis.GraphGroup.id>} groupIds
 * @param {Object} processedGroupData
 * @param {{svg: Object, svgElements: Array.<Object>, options: Object, groups: Array.<vis.Group>}} framework
 */
Bargraph.draw = function (groupIds, processedGroupData, framework) {
  var combinedData = [];
  var intersections = {};
  var coreDistance;
  var key, drawData;
  var group;
  var i, j;
  var barPoints = 0;

  // combine all barchart data
  for (i = 0; i < groupIds.length; i++) {
    group = framework.groups[groupIds[i]];
    if (group.options.style === "bar") {
      if (group.visible === true && (framework.options.groups.visibility[groupIds[i]] === undefined || framework.options.groups.visibility[groupIds[i]] === true)) {
        for (j = 0; j < processedGroupData[groupIds[i]].length; j++) {
          combinedData.push({
            screen_x: processedGroupData[groupIds[i]][j].screen_x,
            screen_end: processedGroupData[groupIds[i]][j].screen_end,
            screen_y: processedGroupData[groupIds[i]][j].screen_y,
            x: processedGroupData[groupIds[i]][j].x,
            end: processedGroupData[groupIds[i]][j].end,
            y: processedGroupData[groupIds[i]][j].y,
            groupId: groupIds[i],
            label: processedGroupData[groupIds[i]][j].label
          });
          barPoints += 1;
        }
      }
    }
  }
  if (barPoints === 0) {
    return;
  }

  // sort by time and by group
  _sortInstanceProperty(combinedData).call(combinedData, function (a, b) {
    if (a.screen_x === b.screen_x) {
      return a.groupId < b.groupId ? -1 : 1;
    } else {
      return a.screen_x - b.screen_x;
    }
  });

  // get intersections
  Bargraph._getDataIntersections(intersections, combinedData);

  // plot barchart
  for (i = 0; i < combinedData.length; i++) {
    group = framework.groups[combinedData[i].groupId];
    var minWidth = group.options.barChart.minWidth != undefined ? group.options.barChart.minWidth : 0.1 * group.options.barChart.width;
    key = combinedData[i].screen_x;
    var heightOffset = 0;
    if (intersections[key] === undefined) {
      if (i + 1 < combinedData.length) {
        coreDistance = Math.abs(combinedData[i + 1].screen_x - key);
      }
      drawData = Bargraph._getSafeDrawData(coreDistance, group, minWidth);
    } else {
      var nextKey = i + (intersections[key].amount - intersections[key].resolved);
      if (nextKey < combinedData.length) {
        coreDistance = Math.abs(combinedData[nextKey].screen_x - key);
      }
      drawData = Bargraph._getSafeDrawData(coreDistance, group, minWidth);
      intersections[key].resolved += 1;
      if (group.options.stack === true && group.options.excludeFromStacking !== true) {
        if (combinedData[i].screen_y < group.zeroPosition) {
          heightOffset = intersections[key].accumulatedNegative;
          intersections[key].accumulatedNegative += group.zeroPosition - combinedData[i].screen_y;
        } else {
          heightOffset = intersections[key].accumulatedPositive;
          intersections[key].accumulatedPositive += group.zeroPosition - combinedData[i].screen_y;
        }
      } else if (group.options.barChart.sideBySide === true) {
        drawData.width = drawData.width / intersections[key].amount;
        drawData.offset += intersections[key].resolved * drawData.width - 0.5 * drawData.width * (intersections[key].amount + 1);
      }
    }
    let dataWidth = drawData.width;
    let start = combinedData[i].screen_x;

    // are we drawing explicit boxes? (we supplied an end value)
    if (combinedData[i].screen_end != undefined) {
      dataWidth = combinedData[i].screen_end - combinedData[i].screen_x;
      start += dataWidth * 0.5;
    } else {
      start += drawData.offset;
    }
    drawBar(start, combinedData[i].screen_y - heightOffset, dataWidth, group.zeroPosition - combinedData[i].screen_y, group.className + " vis-bar", framework.svgElements, framework.svg, group.style);

    // draw points
    if (group.options.drawPoints.enabled === true) {
      let pointData = {
        screen_x: combinedData[i].screen_x,
        screen_y: combinedData[i].screen_y - heightOffset,
        x: combinedData[i].x,
        y: combinedData[i].y,
        groupId: combinedData[i].groupId,
        label: combinedData[i].label
      };
      Points.draw([pointData], group, framework, drawData.offset);
      //DOMutil.drawPoint(combinedData[i].x + drawData.offset, combinedData[i].y, group, framework.svgElements, framework.svg);
    }
  }
};

/**
 * Fill the intersections object with counters of how many datapoints share the same x coordinates
 * @param {Object} intersections
 * @param {Array.<Object>} combinedData
 * @private
 */
Bargraph._getDataIntersections = function (intersections, combinedData) {
  // get intersections
  var coreDistance;
  for (var i = 0; i < combinedData.length; i++) {
    if (i + 1 < combinedData.length) {
      coreDistance = Math.abs(combinedData[i + 1].screen_x - combinedData[i].screen_x);
    }
    if (i > 0) {
      coreDistance = Math.min(coreDistance, Math.abs(combinedData[i - 1].screen_x - combinedData[i].screen_x));
    }
    if (coreDistance === 0) {
      if (intersections[combinedData[i].screen_x] === undefined) {
        intersections[combinedData[i].screen_x] = {
          amount: 0,
          resolved: 0,
          accumulatedPositive: 0,
          accumulatedNegative: 0
        };
      }
      intersections[combinedData[i].screen_x].amount += 1;
    }
  }
};

/**
 * Get the width and offset for bargraphs based on the coredistance between datapoints
 *
 * @param {number} coreDistance
 * @param {vis.Group} group
 * @param {number} minWidth
 * @returns {{width: number, offset: number}}
 * @private
 */
Bargraph._getSafeDrawData = function (coreDistance, group, minWidth) {
  var width, offset;
  if (coreDistance < group.options.barChart.width && coreDistance > 0) {
    width = coreDistance < minWidth ? minWidth : coreDistance;
    offset = 0; // recalculate offset with the new width;
    if (group.options.barChart.align === "left") {
      offset -= 0.5 * coreDistance;
    } else if (group.options.barChart.align === "right") {
      offset += 0.5 * coreDistance;
    }
  } else {
    // default settings
    width = group.options.barChart.width;
    offset = 0;
    if (group.options.barChart.align === "left") {
      offset -= 0.5 * group.options.barChart.width;
    } else if (group.options.barChart.align === "right") {
      offset += 0.5 * group.options.barChart.width;
    }
  }
  return {
    width: width,
    offset: offset
  };
};
Bargraph.getStackedYRange = function (combinedData, groupRanges, groupIds, groupLabel, orientation) {
  if (combinedData.length > 0) {
    // sort by time and by group
    _sortInstanceProperty(combinedData).call(combinedData, function (a, b) {
      if (a.screen_x === b.screen_x) {
        return a.groupId < b.groupId ? -1 : 1;
      } else {
        return a.screen_x - b.screen_x;
      }
    });
    var intersections = {};
    Bargraph._getDataIntersections(intersections, combinedData);
    groupRanges[groupLabel] = Bargraph._getStackedYRange(intersections, combinedData);
    groupRanges[groupLabel].yAxisOrientation = orientation;
    groupIds.push(groupLabel);
  }
};
Bargraph._getStackedYRange = function (intersections, combinedData) {
  var key;
  var yMin = combinedData[0].screen_y;
  var yMax = combinedData[0].screen_y;
  for (var i = 0; i < combinedData.length; i++) {
    key = combinedData[i].screen_x;
    if (intersections[key] === undefined) {
      yMin = yMin > combinedData[i].screen_y ? combinedData[i].screen_y : yMin;
      yMax = yMax < combinedData[i].screen_y ? combinedData[i].screen_y : yMax;
    } else {
      if (combinedData[i].screen_y < 0) {
        intersections[key].accumulatedNegative += combinedData[i].screen_y;
      } else {
        intersections[key].accumulatedPositive += combinedData[i].screen_y;
      }
    }
  }
  for (var xpos in intersections) {
    if (!Object.prototype.hasOwnProperty.call(intersections, xpos)) continue;
    yMin = yMin > intersections[xpos].accumulatedNegative ? intersections[xpos].accumulatedNegative : yMin;
    yMin = yMin > intersections[xpos].accumulatedPositive ? intersections[xpos].accumulatedPositive : yMin;
    yMax = yMax < intersections[xpos].accumulatedNegative ? intersections[xpos].accumulatedNegative : yMax;
    yMax = yMax < intersections[xpos].accumulatedPositive ? intersections[xpos].accumulatedPositive : yMax;
  }
  return {
    min: yMin,
    max: yMax
  };
};

/**
 *
 * @constructor Line
 */
function Line() {}
Line.calcPath = function (dataset, group) {
  if (dataset != null) {
    if (dataset.length > 0) {
      var d = [];

      // construct path from dataset
      if (group.options.interpolation.enabled == true) {
        d = Line._catmullRom(dataset, group);
      } else {
        d = Line._linear(dataset);
      }
      return d;
    }
  }
};
Line.drawIcon = function (group, x, y, iconWidth, iconHeight, framework) {
  var fillHeight = iconHeight * 0.5;
  var path, fillPath;
  var outline = getSVGElement("rect", framework.svgElements, framework.svg);
  outline.setAttributeNS(null, "x", x);
  outline.setAttributeNS(null, "y", y - fillHeight);
  outline.setAttributeNS(null, "width", iconWidth);
  outline.setAttributeNS(null, "height", 2 * fillHeight);
  outline.setAttributeNS(null, "class", "vis-outline");
  path = getSVGElement("path", framework.svgElements, framework.svg);
  path.setAttributeNS(null, "class", group.className);
  if (group.style !== undefined) {
    path.setAttributeNS(null, "style", group.style);
  }
  path.setAttributeNS(null, "d", "M" + x + "," + y + " L" + (x + iconWidth) + "," + y + "");
  if (group.options.shaded.enabled == true) {
    fillPath = getSVGElement("path", framework.svgElements, framework.svg);
    if (group.options.shaded.orientation == "top") {
      fillPath.setAttributeNS(null, "d", "M" + x + ", " + (y - fillHeight) + "L" + x + "," + y + " L" + (x + iconWidth) + "," + y + " L" + (x + iconWidth) + "," + (y - fillHeight));
    } else {
      fillPath.setAttributeNS(null, "d", "M" + x + "," + y + " " + "L" + x + "," + (y + fillHeight) + " " + "L" + (x + iconWidth) + "," + (y + fillHeight) + "L" + (x + iconWidth) + "," + y);
    }
    fillPath.setAttributeNS(null, "class", group.className + " vis-icon-fill");
    if (group.options.shaded.style !== undefined && group.options.shaded.style !== "") {
      fillPath.setAttributeNS(null, "style", group.options.shaded.style);
    }
  }
  if (group.options.drawPoints.enabled == true) {
    var groupTemplate = {
      style: group.options.drawPoints.style,
      styles: group.options.drawPoints.styles,
      size: group.options.drawPoints.size,
      className: group.className
    };
    drawPoint(x + 0.5 * iconWidth, y, groupTemplate, framework.svgElements, framework.svg);
  }
};
Line.drawShading = function (pathArray, group, subPathArray, framework) {
  // append shading to the path
  if (group.options.shaded.enabled == true) {
    var svgHeight = Number(framework.svg.style.height.replace("px", ""));
    var fillPath = getSVGElement("path", framework.svgElements, framework.svg);
    var type = "L";
    if (group.options.interpolation.enabled == true) {
      type = "C";
    }
    var dFill;
    var zero = 0;
    if (group.options.shaded.orientation == "top") {
      zero = 0;
    } else if (group.options.shaded.orientation == "bottom") {
      zero = svgHeight;
    } else {
      zero = Math.min(Math.max(0, group.zeroPosition), svgHeight);
    }
    if (group.options.shaded.orientation == "group" && subPathArray != null && subPathArray != undefined) {
      dFill = "M" + pathArray[0][0] + "," + pathArray[0][1] + " " + this.serializePath(pathArray, type, false) + " L" + subPathArray[subPathArray.length - 1][0] + "," + subPathArray[subPathArray.length - 1][1] + " " + this.serializePath(subPathArray, type, true) + subPathArray[0][0] + "," + subPathArray[0][1] + " Z";
    } else {
      dFill = "M" + pathArray[0][0] + "," + pathArray[0][1] + " " + this.serializePath(pathArray, type, false) + " V" + zero + " H" + pathArray[0][0] + " Z";
    }
    fillPath.setAttributeNS(null, "class", group.className + " vis-fill");
    if (group.options.shaded.style !== undefined) {
      fillPath.setAttributeNS(null, "style", group.options.shaded.style);
    }
    fillPath.setAttributeNS(null, "d", dFill);
  }
};

/**
 * draw a line graph
 *
 * @param {Array.<Object>} pathArray
 * @param {vis.Group} group
 * @param {{svg: Object, svgElements: Array.<Object>, options: Object, groups: Array.<vis.Group>}} framework
 */
Line.draw = function (pathArray, group, framework) {
  if (pathArray != null && pathArray != undefined) {
    var path = getSVGElement("path", framework.svgElements, framework.svg);
    path.setAttributeNS(null, "class", group.className);
    if (group.style !== undefined) {
      path.setAttributeNS(null, "style", group.style);
    }
    var type = "L";
    if (group.options.interpolation.enabled == true) {
      type = "C";
    }
    // copy properties to path for drawing.
    path.setAttributeNS(null, "d", "M" + pathArray[0][0] + "," + pathArray[0][1] + " " + this.serializePath(pathArray, type, false));
  }
};
Line.serializePath = function (pathArray, type, inverse) {
  if (pathArray.length < 2) {
    //Too little data to create a path.
    return "";
  }
  var d = type;
  var i;
  if (inverse) {
    for (i = pathArray.length - 2; i > 0; i--) {
      d += pathArray[i][0] + "," + pathArray[i][1] + " ";
    }
  } else {
    for (i = 1; i < pathArray.length; i++) {
      d += pathArray[i][0] + "," + pathArray[i][1] + " ";
    }
  }
  return d;
};

/**
 * This uses an uniform parametrization of the interpolation algorithm:
 * 'On the Parameterization of Catmull-Rom Curves' by Cem Yuksel et al.
 * @param {Array.<Object>} data
 * @returns {string}
 * @private
 */
Line._catmullRomUniform = function (data) {
  // catmull rom
  var p0, p1, p2, p3, bp1, bp2;
  var d = [];
  d.push([Math.round(data[0].screen_x), Math.round(data[0].screen_y)]);
  var normalization = 1 / 6;
  var length = data.length;
  for (var i = 0; i < length - 1; i++) {
    p0 = i == 0 ? data[0] : data[i - 1];
    p1 = data[i];
    p2 = data[i + 1];
    p3 = i + 2 < length ? data[i + 2] : p2;

    // Catmull-Rom to Cubic Bezier conversion matrix
    //    0       1       0       0
    //  -1/6      1      1/6      0
    //    0      1/6      1     -1/6
    //    0       0       1       0

    //    bp0 = { x: p1.x,                               y: p1.y };
    bp1 = {
      screen_x: (-p0.screen_x + 6 * p1.screen_x + p2.screen_x) * normalization,
      screen_y: (-p0.screen_y + 6 * p1.screen_y + p2.screen_y) * normalization
    };
    bp2 = {
      screen_x: (p1.screen_x + 6 * p2.screen_x - p3.screen_x) * normalization,
      screen_y: (p1.screen_y + 6 * p2.screen_y - p3.screen_y) * normalization
    };
    //    bp0 = { x: p2.x,                               y: p2.y };

    d.push([bp1.screen_x, bp1.screen_y]);
    d.push([bp2.screen_x, bp2.screen_y]);
    d.push([p2.screen_x, p2.screen_y]);
  }
  return d;
};

/**
 * This uses either the chordal or centripetal parameterization of the catmull-rom algorithm.
 * By default, the centripetal parameterization is used because this gives the nicest results.
 * These parameterizations are relatively heavy because the distance between 4 points have to be calculated.
 *
 * One optimization can be used to reuse distances since this is a sliding window approach.
 * @param {Array.<Object>} data
 * @param {vis.GraphGroup} group
 * @returns {string}
 * @private
 */
Line._catmullRom = function (data, group) {
  var alpha = group.options.interpolation.alpha;
  if (alpha == 0 || alpha === undefined) {
    return this._catmullRomUniform(data);
  } else {
    var p0, p1, p2, p3, bp1, bp2, d1, d2, d3, A, B, N, M;
    var d3powA, d2powA, d3pow2A, d2pow2A, d1pow2A, d1powA;
    var d = [];
    d.push([Math.round(data[0].screen_x), Math.round(data[0].screen_y)]);
    var length = data.length;
    for (var i = 0; i < length - 1; i++) {
      p0 = i == 0 ? data[0] : data[i - 1];
      p1 = data[i];
      p2 = data[i + 1];
      p3 = i + 2 < length ? data[i + 2] : p2;
      d1 = Math.sqrt(Math.pow(p0.screen_x - p1.screen_x, 2) + Math.pow(p0.screen_y - p1.screen_y, 2));
      d2 = Math.sqrt(Math.pow(p1.screen_x - p2.screen_x, 2) + Math.pow(p1.screen_y - p2.screen_y, 2));
      d3 = Math.sqrt(Math.pow(p2.screen_x - p3.screen_x, 2) + Math.pow(p2.screen_y - p3.screen_y, 2));

      // Catmull-Rom to Cubic Bezier conversion matrix

      // A = 2d1^2a + 3d1^a * d2^a + d3^2a
      // B = 2d3^2a + 3d3^a * d2^a + d2^2a

      // [   0             1            0          0          ]
      // [   -d2^2a /N     A/N          d1^2a /N   0          ]
      // [   0             d3^2a /M     B/M        -d2^2a /M  ]
      // [   0             0            1          0          ]

      d3powA = Math.pow(d3, alpha);
      d3pow2A = Math.pow(d3, 2 * alpha);
      d2powA = Math.pow(d2, alpha);
      d2pow2A = Math.pow(d2, 2 * alpha);
      d1powA = Math.pow(d1, alpha);
      d1pow2A = Math.pow(d1, 2 * alpha);
      A = 2 * d1pow2A + 3 * d1powA * d2powA + d2pow2A;
      B = 2 * d3pow2A + 3 * d3powA * d2powA + d2pow2A;
      N = 3 * d1powA * (d1powA + d2powA);
      if (N > 0) {
        N = 1 / N;
      }
      M = 3 * d3powA * (d3powA + d2powA);
      if (M > 0) {
        M = 1 / M;
      }
      bp1 = {
        screen_x: (-d2pow2A * p0.screen_x + A * p1.screen_x + d1pow2A * p2.screen_x) * N,
        screen_y: (-d2pow2A * p0.screen_y + A * p1.screen_y + d1pow2A * p2.screen_y) * N
      };
      bp2 = {
        screen_x: (d3pow2A * p1.screen_x + B * p2.screen_x - d2pow2A * p3.screen_x) * M,
        screen_y: (d3pow2A * p1.screen_y + B * p2.screen_y - d2pow2A * p3.screen_y) * M
      };
      if (bp1.screen_x == 0 && bp1.screen_y == 0) {
        bp1 = p1;
      }
      if (bp2.screen_x == 0 && bp2.screen_y == 0) {
        bp2 = p2;
      }
      d.push([bp1.screen_x, bp1.screen_y]);
      d.push([bp2.screen_x, bp2.screen_y]);
      d.push([p2.screen_x, p2.screen_y]);
    }
    return d;
  }
};

/**
 * this generates the SVG path for a linear drawing between datapoints.
 * @param {Array.<Object>} data
 * @returns {string}
 * @private
 */
Line._linear = function (data) {
  // linear
  var d = [];
  for (var i = 0; i < data.length; i++) {
    d.push([data[i].screen_x, data[i].screen_y]);
  }
  return d;
};

/**
 * /**
 * @param {object} group            | the object of the group from the dataset
 * @param {string} groupId          | ID of the group
 * @param {object} options          | the default options
 * @param {array} groupsUsingDefaultStyles  | this array has one entree.
 *                                            It is passed as an array so it is passed by reference.
 *                                            It enumerates through the default styles
 * @constructor GraphGroup
 */
function GraphGroup(group, groupId, options, groupsUsingDefaultStyles) {
  this.id = groupId;
  var fields = ["sampling", "style", "sort", "yAxisOrientation", "barChart", "drawPoints", "shaded", "interpolation", "zIndex", "excludeFromStacking", "excludeFromLegend"];
  this.options = availableUtils.selectiveBridgeObject(fields, options);
  this.usingDefaultStyle = group.className === undefined;
  this.groupsUsingDefaultStyles = groupsUsingDefaultStyles;
  this.zeroPosition = 0;
  this.update(group);
  if (this.usingDefaultStyle == true) {
    this.groupsUsingDefaultStyles[0] += 1;
  }
  this.itemsData = [];
  this.visible = group.visible === undefined ? true : group.visible;
}

/**
 * this loads a reference to all items in this group into this group.
 * @param {array} items
 */
GraphGroup.prototype.setItems = function (items) {
  if (items != null) {
    this.itemsData = items;
    if (_sortInstanceProperty(this.options) == true) {
      availableUtils.insertSort(this.itemsData, function (a, b) {
        return a.x > b.x ? 1 : -1;
      });
    }
  } else {
    this.itemsData = [];
  }
};
GraphGroup.prototype.getItems = function () {
  return this.itemsData;
};

/**
 * this is used for barcharts and shading, this way, we only have to calculate it once.
 * @param {number} pos
 */
GraphGroup.prototype.setZeroPosition = function (pos) {
  this.zeroPosition = pos;
};

/**
 * set the options of the graph group over the default options.
 * @param {Object} options
 */
GraphGroup.prototype.setOptions = function (options) {
  if (options !== undefined) {
    var fields = ["sampling", "style", "sort", "yAxisOrientation", "barChart", "zIndex", "excludeFromStacking", "excludeFromLegend"];
    availableUtils.selectiveDeepExtend(fields, this.options, options);

    // if the group's drawPoints is a function delegate the callback to the onRender property
    if (typeof options.drawPoints == "function") {
      options.drawPoints = {
        onRender: options.drawPoints
      };
    }
    availableUtils.mergeOptions(this.options, options, "interpolation");
    availableUtils.mergeOptions(this.options, options, "drawPoints");
    availableUtils.mergeOptions(this.options, options, "shaded");
    if (options.interpolation) {
      if (typeof options.interpolation == "object") {
        if (options.interpolation.parametrization) {
          if (options.interpolation.parametrization == "uniform") {
            this.options.interpolation.alpha = 0;
          } else if (options.interpolation.parametrization == "chordal") {
            this.options.interpolation.alpha = 1.0;
          } else {
            this.options.interpolation.parametrization = "centripetal";
            this.options.interpolation.alpha = 0.5;
          }
        }
      }
    }
  }
};

/**
 * this updates the current group class with the latest group dataset entree, used in _updateGroup in linegraph
 * @param {vis.Group} group
 */
GraphGroup.prototype.update = function (group) {
  this.group = group;
  this.content = group.content || "graph";
  this.className = group.className || this.className || "vis-graph-group" + this.groupsUsingDefaultStyles[0] % 10;
  this.visible = group.visible === undefined ? true : group.visible;
  this.style = group.style;
  this.setOptions(group.options);
};

/**
 * return the legend entree for this group.
 *
 * @param {number} iconWidth
 * @param {number} iconHeight
 * @param {{svg: (*|Element), svgElements: Object, options: Object, groups: Array.<Object>}} framework
 * @param {number} x
 * @param {number} y
 * @returns {{icon: (*|Element), label: (*|string), orientation: *}}
 */
GraphGroup.prototype.getLegend = function (iconWidth, iconHeight, framework, x, y) {
  if (framework == undefined || framework == null) {
    var svg = document.createElementNS("http://www.w3.org/2000/svg", "svg");
    framework = {
      svg: svg,
      svgElements: {},
      options: this.options,
      groups: [this]
    };
  }
  if (x == undefined || x == null) {
    x = 0;
  }
  if (y == undefined || y == null) {
    y = 0.5 * iconHeight;
  }
  switch (this.options.style) {
    case "line":
      Line.drawIcon(this, x, y, iconWidth, iconHeight, framework);
      break;
    case "points": //explicit no break
    case "point":
      Points.drawIcon(this, x, y, iconWidth, iconHeight, framework);
      break;
    case "bar":
      Bargraph.drawIcon(this, x, y, iconWidth, iconHeight, framework);
      break;
  }
  return {
    icon: framework.svg,
    label: this.content,
    orientation: this.options.yAxisOrientation
  };
};
GraphGroup.prototype.getYRange = function (groupData) {
  var yMin = groupData[0].y;
  var yMax = groupData[0].y;
  for (var j = 0; j < groupData.length; j++) {
    yMin = yMin > groupData[j].y ? groupData[j].y : yMin;
    yMax = yMax < groupData[j].y ? groupData[j].y : yMax;
  }
  return {
    min: yMin,
    max: yMax,
    yAxisOrientation: this.options.yAxisOrientation
  };
};

/**
 * Legend for Graph2d
 *
 * @param {vis.Graph2d.body} body
 * @param {vis.Graph2d.options} options
 * @param {number} side
 * @param {vis.LineGraph.options} linegraphOptions
 * @constructor Legend
 * @extends Component
 */
function Legend(body, options, side, linegraphOptions) {
  this.body = body;
  this.defaultOptions = {
    enabled: false,
    icons: true,
    iconSize: 20,
    iconSpacing: 6,
    left: {
      visible: true,
      position: "top-left" // top/bottom - left,center,right
    },
    right: {
      visible: true,
      position: "top-right" // top/bottom - left,center,right
    }
  };
  this.side = side;
  this.options = availableUtils.extend({}, this.defaultOptions);
  this.linegraphOptions = linegraphOptions;
  this.svgElements = {};
  this.dom = {};
  this.groups = {};
  this.amountOfGroups = 0;
  this._create();
  this.framework = {
    svg: this.svg,
    svgElements: this.svgElements,
    options: this.options,
    groups: this.groups
  };
  this.setOptions(options);
}
Legend.prototype = new Component();
Legend.prototype.clear = function () {
  this.groups = {};
  this.amountOfGroups = 0;
};
Legend.prototype.addGroup = function (label, graphOptions) {
  // Include a group only if the group option 'excludeFromLegend: false' is not set.
  if (graphOptions.options.excludeFromLegend != true) {
    if (!Object.prototype.hasOwnProperty.call(this.groups, label)) {
      this.groups[label] = graphOptions;
    }
    this.amountOfGroups += 1;
  }
};
Legend.prototype.updateGroup = function (label, graphOptions) {
  this.groups[label] = graphOptions;
};
Legend.prototype.removeGroup = function (label) {
  if (Object.prototype.hasOwnProperty.call(this.groups, label)) {
    delete this.groups[label];
    this.amountOfGroups -= 1;
  }
};
Legend.prototype._create = function () {
  this.dom.frame = document.createElement("div");
  this.dom.frame.className = "vis-legend";
  this.dom.frame.style.position = "absolute";
  this.dom.frame.style.top = "10px";
  this.dom.frame.style.display = "block";
  this.dom.textArea = document.createElement("div");
  this.dom.textArea.className = "vis-legend-text";
  this.dom.textArea.style.position = "relative";
  this.dom.textArea.style.top = "0px";
  this.svg = document.createElementNS("http://www.w3.org/2000/svg", "svg");
  this.svg.style.position = "absolute";
  this.svg.style.top = 0 + "px";
  this.svg.style.width = this.options.iconSize + 5 + "px";
  this.svg.style.height = "100%";
  this.dom.frame.appendChild(this.svg);
  this.dom.frame.appendChild(this.dom.textArea);
};

/**
 * Hide the component from the DOM
 */
Legend.prototype.hide = function () {
  // remove the frame containing the items
  if (this.dom.frame.parentNode) {
    this.dom.frame.parentNode.removeChild(this.dom.frame);
  }
};

/**
 * Show the component in the DOM (when not already visible).
 */
Legend.prototype.show = function () {
  // show frame containing the items
  if (!this.dom.frame.parentNode) {
    this.body.dom.center.appendChild(this.dom.frame);
  }
};
Legend.prototype.setOptions = function (options) {
  var fields = ["enabled", "orientation", "icons", "left", "right"];
  availableUtils.selectiveDeepExtend(fields, this.options, options);
};
Legend.prototype.redraw = function () {
  var activeGroups = 0;
  var groupArray = _Object$keys(this.groups);
  _sortInstanceProperty(groupArray).call(groupArray, function (a, b) {
    return a < b ? -1 : 1;
  });
  for (var i = 0; i < groupArray.length; i++) {
    var groupId = groupArray[i];
    if (this.groups[groupId].visible == true && (this.linegraphOptions.visibility[groupId] === undefined || this.linegraphOptions.visibility[groupId] == true)) {
      activeGroups++;
    }
  }
  if (this.options[this.side].visible == false || this.amountOfGroups == 0 || this.options.enabled == false || activeGroups == 0) {
    this.hide();
  } else {
    this.show();
    if (this.options[this.side].position == "top-left" || this.options[this.side].position == "bottom-left") {
      this.dom.frame.style.left = "4px";
      this.dom.frame.style.textAlign = "left";
      this.dom.textArea.style.textAlign = "left";
      this.dom.textArea.style.left = this.options.iconSize + 15 + "px";
      this.dom.textArea.style.right = "";
      this.svg.style.left = 0 + "px";
      this.svg.style.right = "";
    } else {
      this.dom.frame.style.right = "4px";
      this.dom.frame.style.textAlign = "right";
      this.dom.textArea.style.textAlign = "right";
      this.dom.textArea.style.right = this.options.iconSize + 15 + "px";
      this.dom.textArea.style.left = "";
      this.svg.style.right = 0 + "px";
      this.svg.style.left = "";
    }
    if (this.options[this.side].position == "top-left" || this.options[this.side].position == "top-right") {
      this.dom.frame.style.top = 4 - Number(this.body.dom.center.style.top.replace("px", "")) + "px";
      this.dom.frame.style.bottom = "";
    } else {
      var scrollableHeight = this.body.domProps.center.height - this.body.domProps.centerContainer.height;
      this.dom.frame.style.bottom = 4 + scrollableHeight + Number(this.body.dom.center.style.top.replace("px", "")) + "px";
      this.dom.frame.style.top = "";
    }
    if (this.options.icons == false) {
      this.dom.frame.style.width = this.dom.textArea.offsetWidth + 10 + "px";
      this.dom.textArea.style.right = "";
      this.dom.textArea.style.left = "";
      this.svg.style.width = "0px";
    } else {
      this.dom.frame.style.width = this.options.iconSize + 15 + this.dom.textArea.offsetWidth + 10 + "px";
      this.drawLegendIcons();
    }
    var content = "";
    for (i = 0; i < groupArray.length; i++) {
      groupId = groupArray[i];
      if (this.groups[groupId].visible == true && (this.linegraphOptions.visibility[groupId] === undefined || this.linegraphOptions.visibility[groupId] == true)) {
        content += this.groups[groupId].content + "<br />";
      }
    }
    this.dom.textArea.innerHTML = availableUtils.xss(content);
    this.dom.textArea.style.lineHeight = 0.75 * this.options.iconSize + this.options.iconSpacing + "px";
  }
};
Legend.prototype.drawLegendIcons = function () {
  if (this.dom.frame.parentNode) {
    var groupArray = _Object$keys(this.groups);
    _sortInstanceProperty(groupArray).call(groupArray, function (a, b) {
      return a < b ? -1 : 1;
    });

    // this resets the elements so the order is maintained
    resetElements(this.svgElements);
    var padding = window.getComputedStyle(this.dom.frame).paddingTop;
    var iconOffset = Number(padding.replace("px", ""));
    var x = iconOffset;
    var iconWidth = this.options.iconSize;
    var iconHeight = 0.75 * this.options.iconSize;
    var y = iconOffset + 0.5 * iconHeight + 3;
    this.svg.style.width = iconWidth + 5 + iconOffset + "px";
    for (var i = 0; i < groupArray.length; i++) {
      var groupId = groupArray[i];
      if (this.groups[groupId].visible == true && (this.linegraphOptions.visibility[groupId] === undefined || this.linegraphOptions.visibility[groupId] == true)) {
        this.groups[groupId].getLegend(iconWidth, iconHeight, this.framework, x, y);
        y += iconHeight + this.options.iconSpacing;
      }
    }
  }
};

var UNGROUPED = "__ungrouped__"; // reserved group id for ungrouped items

/**
 * This is the constructor of the LineGraph. It requires a Timeline body and options.
 *
 * @param {vis.Timeline.body} body
 * @param {Object} options
 * @constructor LineGraph
 * @extends Component
 */
function LineGraph(body, options) {
  this.id = v4();
  this.body = body;
  this.defaultOptions = {
    yAxisOrientation: "left",
    defaultGroup: "default",
    sort: true,
    sampling: true,
    stack: false,
    graphHeight: "400px",
    shaded: {
      enabled: false,
      orientation: "bottom" // top, bottom, zero
    },
    style: "line",
    // line, bar
    barChart: {
      width: 50,
      sideBySide: false,
      align: "center" // left, center, right
    },
    interpolation: {
      enabled: true,
      parametrization: "centripetal",
      // uniform (alpha = 0.0), chordal (alpha = 1.0), centripetal (alpha = 0.5)
      alpha: 0.5
    },
    drawPoints: {
      enabled: true,
      size: 6,
      style: "square" // square, circle
    },
    dataAxis: {},
    //Defaults are done on DataAxis level
    legend: {},
    //Defaults are done on Legend level
    groups: {
      visibility: {}
    }
  };

  // options is shared by this lineGraph and all its items
  this.options = availableUtils.extend({}, this.defaultOptions);
  this.dom = {};
  this.props = {};
  this.hammer = null;
  this.groups = {};
  this.abortedGraphUpdate = false;
  this.updateSVGheight = false;
  this.updateSVGheightOnResize = false;
  this.forceGraphUpdate = true;
  var me = this;
  this.itemsData = null; // DataSet
  this.groupsData = null; // DataSet

  // listeners for the DataSet of the items
  this.itemListeners = {
    add: function (_event, params) {
      me._onAdd(params.items);
    },
    update: function (_event, params) {
      me._onUpdate(params.items);
    },
    remove: function (_event, params) {
      me._onRemove(params.items);
    }
  };

  // listeners for the DataSet of the groups
  this.groupListeners = {
    add: function (_event, params) {
      me._onAddGroups(params.items);
    },
    update: function (_event, params) {
      me._onUpdateGroups(params.items);
    },
    remove: function (_event, params) {
      me._onRemoveGroups(params.items);
    }
  };
  this.items = {}; // object with an Item for every data item
  this.selection = []; // list with the ids of all selected nodes
  this.lastStart = this.body.range.start;
  this.touchParams = {}; // stores properties while dragging

  this.svgElements = {};
  this.setOptions(options);
  this.groupsUsingDefaultStyles = [0];
  this.body.emitter.on("rangechanged", function () {
    me.svg.style.left = availableUtils.option.asSize(-me.props.width);
    me.forceGraphUpdate = true;
    //Is this local redraw necessary? (Core also does a change event!)
    me.redraw.call(me);
  });

  // create the HTML DOM
  this._create();
  this.framework = {
    svg: this.svg,
    svgElements: this.svgElements,
    options: this.options,
    groups: this.groups
  };
}
LineGraph.prototype = new Component();

/**
 * Create the HTML DOM for the ItemSet
 */
LineGraph.prototype._create = function () {
  var frame = document.createElement("div");
  frame.className = "vis-line-graph";
  this.dom.frame = frame;

  // create svg element for graph drawing.
  this.svg = document.createElementNS("http://www.w3.org/2000/svg", "svg");
  this.svg.style.position = "relative";
  this.svg.style.height = ("" + this.options.graphHeight).replace("px", "") + "px";
  this.svg.style.display = "block";
  frame.appendChild(this.svg);

  // data axis
  this.options.dataAxis.orientation = "left";
  this.yAxisLeft = new DataAxis(this.body, this.options.dataAxis, this.svg, this.options.groups);
  this.options.dataAxis.orientation = "right";
  this.yAxisRight = new DataAxis(this.body, this.options.dataAxis, this.svg, this.options.groups);
  delete this.options.dataAxis.orientation;

  // legends
  this.legendLeft = new Legend(this.body, this.options.legend, "left", this.options.groups);
  this.legendRight = new Legend(this.body, this.options.legend, "right", this.options.groups);
  this.show();
};

/**
 * set the options of the LineGraph. the mergeOptions is used for subObjects that have an enabled element.
 * @param {object} options
 */
LineGraph.prototype.setOptions = function (options) {
  if (options) {
    var fields = ["sampling", "defaultGroup", "stack", "height", "graphHeight", "yAxisOrientation", "style", "barChart", "dataAxis", "sort", "groups"];
    if (options.graphHeight === undefined && options.height !== undefined) {
      this.updateSVGheight = true;
      this.updateSVGheightOnResize = true;
    } else if (this.body.domProps.centerContainer.height !== undefined && options.graphHeight !== undefined) {
      if (_parseInt((options.graphHeight + "").replace("px", "")) < this.body.domProps.centerContainer.height) {
        this.updateSVGheight = true;
      }
    }
    availableUtils.selectiveDeepExtend(fields, this.options, options);
    availableUtils.mergeOptions(this.options, options, "interpolation");
    availableUtils.mergeOptions(this.options, options, "drawPoints");
    availableUtils.mergeOptions(this.options, options, "shaded");
    availableUtils.mergeOptions(this.options, options, "legend");
    if (options.interpolation) {
      if (typeof options.interpolation == "object") {
        if (options.interpolation.parametrization) {
          if (options.interpolation.parametrization == "uniform") {
            this.options.interpolation.alpha = 0;
          } else if (options.interpolation.parametrization == "chordal") {
            this.options.interpolation.alpha = 1.0;
          } else {
            this.options.interpolation.parametrization = "centripetal";
            this.options.interpolation.alpha = 0.5;
          }
        }
      }
    }
    if (this.yAxisLeft) {
      if (options.dataAxis !== undefined) {
        this.yAxisLeft.setOptions(this.options.dataAxis);
        this.yAxisRight.setOptions(this.options.dataAxis);
      }
    }
    if (this.legendLeft) {
      if (options.legend !== undefined) {
        this.legendLeft.setOptions(this.options.legend);
        this.legendRight.setOptions(this.options.legend);
      }
    }
    if (Object.prototype.hasOwnProperty.call(this.groups, UNGROUPED)) {
      this.groups[UNGROUPED].setOptions(options);
    }
  }

  // this is used to redraw the graph if the visibility of the groups is changed.
  if (this.dom.frame) {
    //not on initial run?
    this.forceGraphUpdate = true;
    this.body.emitter.emit("_change", {
      queue: true
    });
  }
};

/**
 * Hide the component from the DOM
 */
LineGraph.prototype.hide = function () {
  // remove the frame containing the items
  if (this.dom.frame.parentNode) {
    this.dom.frame.parentNode.removeChild(this.dom.frame);
  }
};

/**
 * Show the component in the DOM (when not already visible).
 */
LineGraph.prototype.show = function () {
  // show frame containing the items
  if (!this.dom.frame.parentNode) {
    this.body.dom.center.appendChild(this.dom.frame);
  }
};

/**
 * Set items
 * @param {vis.DataSet | null} items
 */
LineGraph.prototype.setItems = function (items) {
  var me = this,
    ids,
    oldItemsData = this.itemsData;

  // replace the dataset
  if (!items) {
    this.itemsData = null;
  } else if (isDataViewLike(items)) {
    this.itemsData = typeCoerceDataSet(items);
  } else {
    throw new TypeError("Data must implement the interface of DataSet or DataView");
  }
  if (oldItemsData) {
    // unsubscribe from old dataset
    _forEachInstanceProperty(availableUtils).call(availableUtils, this.itemListeners, function (callback, event) {
      oldItemsData.off(event, callback);
    });

    // stop maintaining a coerced version of the old data set
    oldItemsData.dispose();

    // remove all drawn items
    ids = oldItemsData.getIds();
    this._onRemove(ids);
  }
  if (this.itemsData) {
    // subscribe to new dataset
    var id = this.id;
    _forEachInstanceProperty(availableUtils).call(availableUtils, this.itemListeners, function (callback, event) {
      me.itemsData.on(event, callback, id);
    });

    // add all new items
    ids = this.itemsData.getIds();
    this._onAdd(ids);
  }
};

/**
 * Set groups
 * @param {vis.DataSet} groups
 */
LineGraph.prototype.setGroups = function (groups) {
  var me = this;
  var ids;

  // unsubscribe from current dataset
  if (this.groupsData) {
    _forEachInstanceProperty(availableUtils).call(availableUtils, this.groupListeners, function (callback, event) {
      me.groupsData.off(event, callback);
    });

    // remove all drawn groups
    ids = this.groupsData.getIds();
    this.groupsData = null;
    for (var i = 0; i < ids.length; i++) {
      this._removeGroup(ids[i]);
    }
  }

  // replace the dataset
  if (!groups) {
    this.groupsData = null;
  } else if (isDataViewLike(groups)) {
    this.groupsData = groups;
  } else {
    throw new TypeError("Data must implement the interface of DataSet or DataView");
  }
  if (this.groupsData) {
    // subscribe to new dataset
    var id = this.id;
    _forEachInstanceProperty(availableUtils).call(availableUtils, this.groupListeners, function (callback, event) {
      me.groupsData.on(event, callback, id);
    });

    // draw all ms
    ids = this.groupsData.getIds();
    this._onAddGroups(ids);
  }
};
LineGraph.prototype._onUpdate = function (ids) {
  this._updateAllGroupData(ids);
};
LineGraph.prototype._onAdd = function (ids) {
  this._onUpdate(ids);
};
LineGraph.prototype._onRemove = function (ids) {
  this._onUpdate(ids);
};
LineGraph.prototype._onUpdateGroups = function (groupIds) {
  this._updateAllGroupData(null, groupIds);
};
LineGraph.prototype._onAddGroups = function (groupIds) {
  this._onUpdateGroups(groupIds);
};

/**
 * this cleans the group out off the legends and the dataaxis, updates the ungrouped and updates the graph
 * @param {Array} groupIds
 * @private
 */
LineGraph.prototype._onRemoveGroups = function (groupIds) {
  for (var i = 0; i < groupIds.length; i++) {
    this._removeGroup(groupIds[i]);
  }
  this.forceGraphUpdate = true;
  this.body.emitter.emit("_change", {
    queue: true
  });
};

/**
 * this cleans the group out off the legends and the dataaxis
 * @param {vis.GraphGroup.id} groupId
 * @private
 */
LineGraph.prototype._removeGroup = function (groupId) {
  if (!Object.prototype.hasOwnProperty.call(this.groups, groupId)) return;
  if (this.groups[groupId].options.yAxisOrientation == "right") {
    this.yAxisRight.removeGroup(groupId);
    this.legendRight.removeGroup(groupId);
    this.legendRight.redraw();
  } else {
    this.yAxisLeft.removeGroup(groupId);
    this.legendLeft.removeGroup(groupId);
    this.legendLeft.redraw();
  }
  delete this.groups[groupId];
};

/**
 * update a group object with the group dataset entree
 *
 * @param {vis.GraphGroup} group
 * @param {vis.GraphGroup.id} groupId
 * @private
 */
LineGraph.prototype._updateGroup = function (group, groupId) {
  if (!Object.prototype.hasOwnProperty.call(this.groups, groupId)) {
    this.groups[groupId] = new GraphGroup(group, groupId, this.options, this.groupsUsingDefaultStyles);
    if (this.groups[groupId].options.yAxisOrientation == "right") {
      this.yAxisRight.addGroup(groupId, this.groups[groupId]);
      this.legendRight.addGroup(groupId, this.groups[groupId]);
    } else {
      this.yAxisLeft.addGroup(groupId, this.groups[groupId]);
      this.legendLeft.addGroup(groupId, this.groups[groupId]);
    }
  } else {
    this.groups[groupId].update(group);
    if (this.groups[groupId].options.yAxisOrientation == "right") {
      this.yAxisRight.updateGroup(groupId, this.groups[groupId]);
      this.legendRight.updateGroup(groupId, this.groups[groupId]);
      //If yAxisOrientation changed, clean out the group from the other axis.
      this.yAxisLeft.removeGroup(groupId);
      this.legendLeft.removeGroup(groupId);
    } else {
      this.yAxisLeft.updateGroup(groupId, this.groups[groupId]);
      this.legendLeft.updateGroup(groupId, this.groups[groupId]);
      //If yAxisOrientation changed, clean out the group from the other axis.
      this.yAxisRight.removeGroup(groupId);
      this.legendRight.removeGroup(groupId);
    }
  }
  this.legendLeft.redraw();
  this.legendRight.redraw();
};

/**
 * this updates all groups, it is used when there is an update the the itemset.
 *
 * @param  {Array} ids
 * @param  {Array} groupIds
 * @private
 */
LineGraph.prototype._updateAllGroupData = function (ids, groupIds) {
  if (this.itemsData != null) {
    var groupsContent = {};
    var items = this.itemsData.get();
    var fieldId = this.itemsData.idProp;
    var idMap = {};
    if (ids) {
      _mapInstanceProperty(ids).call(ids, function (id) {
        idMap[id] = id;
      });
    }

    //pre-Determine array sizes, for more efficient memory claim
    var groupCounts = {};
    for (var i = 0; i < items.length; i++) {
      var item = items[i];
      var groupId = item.group;
      if (groupId === null || groupId === undefined) {
        groupId = UNGROUPED;
      }
      Object.prototype.hasOwnProperty.call(groupCounts, groupId) ? groupCounts[groupId]++ : groupCounts[groupId] = 1;
    }

    //Pre-load arrays from existing groups if items are not changed (not in ids)
    var existingItemsMap = {};
    if (!groupIds && ids) {
      for (groupId in this.groups) {
        if (!Object.prototype.hasOwnProperty.call(this.groups, groupId)) continue;
        group = this.groups[groupId];
        var existing_items = group.getItems();
        groupsContent[groupId] = _filterInstanceProperty(existing_items).call(existing_items, function (item) {
          existingItemsMap[item[fieldId]] = item[fieldId];
          return item[fieldId] !== idMap[item[fieldId]];
        });
        var newLength = groupCounts[groupId];
        groupCounts[groupId] -= groupsContent[groupId].length;
        if (groupsContent[groupId].length < newLength) groupsContent[groupId][newLength - 1] = {};
      }
    }

    //Now insert data into the arrays.
    for (i = 0; i < items.length; i++) {
      item = items[i];
      groupId = item.group;
      if (groupId === null || groupId === undefined) {
        groupId = UNGROUPED;
      }
      if (!groupIds && ids && item[fieldId] !== idMap[item[fieldId]] && Object.prototype.hasOwnProperty.call(existingItemsMap, item[fieldId])) {
        continue;
      }
      if (!Object.prototype.hasOwnProperty.call(groupsContent, groupId)) {
        groupsContent[groupId] = new Array(groupCounts[groupId]);
      }
      //Copy data (because of unmodifiable DataView input.
      var extended = availableUtils.bridgeObject(item);
      extended.x = availableUtils.convert(item.x, "Date");
      extended.end = availableUtils.convert(item.end, "Date");
      extended.orginalY = item.y; //real Y
      extended.y = Number(item.y);
      extended[fieldId] = item[fieldId];
      var index = groupsContent[groupId].length - groupCounts[groupId]--;
      groupsContent[groupId][index] = extended;
    }

    //Make sure all groups are present, to allow removal of old groups
    for (groupId in this.groups) {
      if (!Object.prototype.hasOwnProperty.call(this.groups, groupId) || Object.prototype.hasOwnProperty.call(groupsContent, groupId)) continue;
      groupsContent[groupId] = new Array(0);
    }

    //Update legendas, style and axis
    for (groupId in groupsContent) {
      if (!Object.prototype.hasOwnProperty.call(groupsContent, groupId)) continue;
      if (groupsContent[groupId].length == 0) {
        if (Object.prototype.hasOwnProperty.call(this.groups, groupId)) {
          this._removeGroup(groupId);
        }
      } else {
        var group = undefined;
        if (this.groupsData != undefined) {
          group = this.groupsData.get(groupId);
        }
        if (group == undefined) {
          group = {
            id: groupId,
            content: this.options.defaultGroup + groupId
          };
        }
        this._updateGroup(group, groupId);
        this.groups[groupId].setItems(groupsContent[groupId]);
      }
    }
    this.forceGraphUpdate = true;
    this.body.emitter.emit("_change", {
      queue: true
    });
  }
};

/**
 * Redraw the component, mandatory function
 * @return {boolean} Returns true if the component is resized
 */
LineGraph.prototype.redraw = function () {
  var resized = false;

  // calculate actual size and position
  this.props.width = this.dom.frame.offsetWidth;
  this.props.height = this.body.domProps.centerContainer.height - this.body.domProps.border.top - this.body.domProps.border.bottom;

  // check if this component is resized
  resized = this._isResized() || resized;

  // check whether zoomed (in that case we need to re-stack everything)
  var visibleInterval = this.body.range.end - this.body.range.start;
  var zoomed = visibleInterval != this.lastVisibleInterval;
  this.lastVisibleInterval = visibleInterval;

  // the svg element is three times as big as the width, this allows for fully dragging left and right
  // without reloading the graph. the controls for this are bound to events in the constructor
  if (resized == true) {
    var _context;
    this.svg.style.width = availableUtils.option.asSize(3 * this.props.width);
    this.svg.style.left = availableUtils.option.asSize(-this.props.width);

    // if the height of the graph is set as proportional, change the height of the svg
    if (_indexOfInstanceProperty(_context = this.options.height + "").call(_context, "%") != -1 || this.updateSVGheightOnResize == true) {
      this.updateSVGheight = true;
    }
  }

  // update the height of the graph on each redraw of the graph.
  if (this.updateSVGheight == true) {
    if (this.options.graphHeight != this.props.height + "px") {
      this.options.graphHeight = this.props.height + "px";
      this.svg.style.height = this.props.height + "px";
    }
    this.updateSVGheight = false;
  } else {
    this.svg.style.height = ("" + this.options.graphHeight).replace("px", "") + "px";
  }

  // zoomed is here to ensure that animations are shown correctly.
  if (resized == true || zoomed == true || this.abortedGraphUpdate == true || this.forceGraphUpdate == true) {
    resized = this._updateGraph() || resized;
    this.forceGraphUpdate = false;
    this.lastStart = this.body.range.start;
    this.svg.style.left = -this.props.width + "px";
  } else {
    // move the whole svg while dragging
    if (this.lastStart != 0) {
      var offset = this.body.range.start - this.lastStart;
      var range = this.body.range.end - this.body.range.start;
      if (this.props.width != 0) {
        var rangePerPixelInv = this.props.width / range;
        var xOffset = offset * rangePerPixelInv;
        this.svg.style.left = -this.props.width - xOffset + "px";
      }
    }
  }
  this.legendLeft.redraw();
  this.legendRight.redraw();
  return resized;
};
LineGraph.prototype._getSortedGroupIds = function () {
  // getting group Ids
  var grouplist = [];
  for (var groupId in this.groups) {
    if (Object.prototype.hasOwnProperty.call(this.groups, groupId)) {
      var group = this.groups[groupId];
      if (group.visible == true && (this.options.groups.visibility[groupId] === undefined || this.options.groups.visibility[groupId] == true)) {
        grouplist.push({
          id: groupId,
          zIndex: group.options.zIndex
        });
      }
    }
  }
  availableUtils.insertSort(grouplist, function (a, b) {
    var az = a.zIndex;
    var bz = b.zIndex;
    if (az === undefined) az = 0;
    if (bz === undefined) bz = 0;
    return az == bz ? 0 : az < bz ? -1 : 1;
  });
  var groupIds = new Array(grouplist.length);
  for (var i = 0; i < grouplist.length; i++) {
    groupIds[i] = grouplist[i].id;
  }
  return groupIds;
};

/**
 * Update and redraw the graph.
 *
 * @returns {boolean}
 * @private
 */
LineGraph.prototype._updateGraph = function () {
  // reset the svg elements
  prepareElements(this.svgElements);
  if (this.props.width != 0 && this.itemsData != null) {
    var group, i;
    var groupRanges = {};
    var changeCalled = false;
    // this is the range of the SVG canvas
    var minDate = this.body.util.toGlobalTime(-this.body.domProps.root.width);
    var maxDate = this.body.util.toGlobalTime(2 * this.body.domProps.root.width);

    // getting group Ids
    var groupIds = this._getSortedGroupIds();
    if (groupIds.length > 0) {
      var groupsData = {};

      // fill groups data, this only loads the data we require based on the timewindow
      this._getRelevantData(groupIds, groupsData, minDate, maxDate);

      // apply sampling, if disabled, it will pass through this function.
      this._applySampling(groupIds, groupsData);

      // we transform the X coordinates to detect collisions
      for (i = 0; i < groupIds.length; i++) {
        this._convertXcoordinates(groupsData[groupIds[i]]);
      }

      // now all needed data has been collected we start the processing.
      this._getYRanges(groupIds, groupsData, groupRanges);

      // update the Y axis first, we use this data to draw at the correct Y points
      changeCalled = this._updateYAxis(groupIds, groupRanges);

      //  at changeCalled, abort this update cycle as the graph needs another update with new Width input from the Redraw container.
      //  Cleanup SVG elements on abort.
      if (changeCalled == true) {
        cleanupElements(this.svgElements);
        this.abortedGraphUpdate = true;
        return true;
      }
      this.abortedGraphUpdate = false;

      // With the yAxis scaled correctly, use this to get the Y values of the points.
      var below = undefined;
      for (i = 0; i < groupIds.length; i++) {
        group = this.groups[groupIds[i]];
        if (this.options.stack === true && this.options.style === "line") {
          if (group.options.excludeFromStacking == undefined || !group.options.excludeFromStacking) {
            if (below != undefined) {
              this._stack(groupsData[group.id], groupsData[below.id]);
              if (group.options.shaded.enabled == true && group.options.shaded.orientation !== "group") {
                if (group.options.shaded.orientation == "top" && below.options.shaded.orientation !== "group") {
                  below.options.shaded.orientation = "group";
                  below.options.shaded.groupId = group.id;
                } else {
                  group.options.shaded.orientation = "group";
                  group.options.shaded.groupId = below.id;
                }
              }
            }
            below = group;
          }
        }
        this._convertYcoordinates(groupsData[groupIds[i]], group);
      }

      //Precalculate paths and draw shading if appropriate. This will make sure the shading is always behind any lines.
      var paths = {};
      for (i = 0; i < groupIds.length; i++) {
        group = this.groups[groupIds[i]];
        if (group.options.style === "line" && group.options.shaded.enabled == true) {
          var dataset = groupsData[groupIds[i]];
          if (dataset == null || dataset.length == 0) {
            continue;
          }
          if (!Object.prototype.hasOwnProperty.call(paths, groupIds[i])) {
            paths[groupIds[i]] = Line.calcPath(dataset, group);
          }
          if (group.options.shaded.orientation === "group") {
            var subGroupId = group.options.shaded.groupId;
            if (_indexOfInstanceProperty(groupIds).call(groupIds, subGroupId) === -1) {
              console.log(group.id + ": Unknown shading group target given:" + subGroupId);
              continue;
            }
            if (!Object.prototype.hasOwnProperty.call(paths, subGroupId)) {
              paths[subGroupId] = Line.calcPath(groupsData[subGroupId], this.groups[subGroupId]);
            }
            Line.drawShading(paths[groupIds[i]], group, paths[subGroupId], this.framework);
          } else {
            Line.drawShading(paths[groupIds[i]], group, undefined, this.framework);
          }
        }
      }

      // draw the groups, calculating paths if still necessary.
      Bargraph.draw(groupIds, groupsData, this.framework);
      for (i = 0; i < groupIds.length; i++) {
        group = this.groups[groupIds[i]];
        if (groupsData[groupIds[i]].length > 0) {
          switch (group.options.style) {
            case "line":
              if (!Object.prototype.hasOwnProperty.call(paths, groupIds[i])) {
                paths[groupIds[i]] = Line.calcPath(groupsData[groupIds[i]], group);
              }
              Line.draw(paths[groupIds[i]], group, this.framework);

            // eslint-disable-next-line no-fallthrough
            case "point":
            // eslint-disable-next-line no-fallthrough
            case "points":
              if (group.options.style == "point" || group.options.style == "points" || group.options.drawPoints.enabled == true) {
                Points.draw(groupsData[groupIds[i]], group, this.framework);
              }
              break;
            //do nothing...
          }
        }
      }
    }
  }

  // cleanup unused svg elements
  cleanupElements(this.svgElements);
  return false;
};
LineGraph.prototype._stack = function (data, subData) {
  var index, dx, dy, subPrevPoint, subNextPoint;
  index = 0;
  // for each data point we look for a matching on in the set below
  for (var j = 0; j < data.length; j++) {
    subPrevPoint = undefined;
    subNextPoint = undefined;
    // we look for time matches or a before-after point
    for (var k = index; k < subData.length; k++) {
      // if times match exactly
      if (subData[k].x === data[j].x) {
        subPrevPoint = subData[k];
        subNextPoint = subData[k];
        index = k;
        break;
      } else if (subData[k].x > data[j].x) {
        // overshoot
        subNextPoint = subData[k];
        if (k == 0) {
          subPrevPoint = subNextPoint;
        } else {
          subPrevPoint = subData[k - 1];
        }
        index = k;
        break;
      }
    }
    // in case the last data point has been used, we assume it stays like this.
    if (subNextPoint === undefined) {
      subPrevPoint = subData[subData.length - 1];
      subNextPoint = subData[subData.length - 1];
    }
    // linear interpolation
    dx = subNextPoint.x - subPrevPoint.x;
    dy = subNextPoint.y - subPrevPoint.y;
    if (dx == 0) {
      data[j].y = data[j].orginalY + subNextPoint.y;
    } else {
      data[j].y = data[j].orginalY + dy / dx * (data[j].x - subPrevPoint.x) + subPrevPoint.y; // ax + b where b is data[j].y
    }
  }
};

/**
 * first select and preprocess the data from the datasets.
 * the groups have their preselection of data, we now loop over this data to see
 * what data we need to draw. Sorted data is much faster.
 * more optimization is possible by doing the sampling before and using the binary search
 * to find the end date to determine the increment.
 *
 * @param {array}  groupIds
 * @param {object} groupsData
 * @param {date}   minDate
 * @param {date}   maxDate
 * @private
 */
LineGraph.prototype._getRelevantData = function (groupIds, groupsData, minDate, maxDate) {
  var group, i, j, item;
  if (groupIds.length > 0) {
    for (i = 0; i < groupIds.length; i++) {
      group = this.groups[groupIds[i]];
      var itemsData = group.getItems();
      // optimization for sorted data
      if (_sortInstanceProperty(group.options) == true) {
        var dateComparator = function (a, b) {
          return a.getTime() == b.getTime() ? 0 : a < b ? -1 : 1;
        };
        var first = Math.max(0, availableUtils.binarySearchValue(itemsData, minDate, "x", "before", dateComparator));
        var last = Math.min(itemsData.length, availableUtils.binarySearchValue(itemsData, maxDate, "x", "after", dateComparator) + 1);
        if (last <= 0) {
          last = itemsData.length;
        }
        var dataContainer = new Array(last - first);
        for (j = first; j < last; j++) {
          item = group.itemsData[j];
          dataContainer[j - first] = item;
        }
        groupsData[groupIds[i]] = dataContainer;
      } else {
        // If unsorted data, all data is relevant, just returning entire structure
        groupsData[groupIds[i]] = group.itemsData;
      }
    }
  }
};

/**
 *
 * @param {Array.<vis.GraphGroup.id>} groupIds
 * @param {vis.DataSet} groupsData
 * @private
 */
LineGraph.prototype._applySampling = function (groupIds, groupsData) {
  var group;
  if (groupIds.length > 0) {
    for (var i = 0; i < groupIds.length; i++) {
      group = this.groups[groupIds[i]];
      if (group.options.sampling == true) {
        var dataContainer = groupsData[groupIds[i]];
        if (dataContainer.length > 0) {
          var increment = 1;
          var amountOfPoints = dataContainer.length;

          // the global screen is used because changing the width of the yAxis may affect the increment, resulting in an endless loop
          // of width changing of the yAxis.
          //TODO: This assumes sorted data, but that's not guaranteed!
          var xDistance = this.body.util.toGlobalScreen(dataContainer[dataContainer.length - 1].x) - this.body.util.toGlobalScreen(dataContainer[0].x);
          var pointsPerPixel = amountOfPoints / xDistance;
          increment = Math.min(Math.ceil(0.2 * amountOfPoints), Math.max(1, Math.round(pointsPerPixel)));
          var sampledData = new Array(amountOfPoints);
          for (var j = 0; j < amountOfPoints; j += increment) {
            var idx = Math.round(j / increment);
            sampledData[idx] = dataContainer[j];
          }
          groupsData[groupIds[i]] = _spliceInstanceProperty(sampledData).call(sampledData, 0, Math.round(amountOfPoints / increment));
        }
      }
    }
  }
};

/**
 *
 * @param {Array.<vis.GraphGroup.id>} groupIds
 * @param {vis.DataSet} groupsData
 * @param {object} groupRanges  | this is being filled here
 * @private
 */
LineGraph.prototype._getYRanges = function (groupIds, groupsData, groupRanges) {
  var groupData, group, i;
  var combinedDataLeft = [];
  var combinedDataRight = [];
  var options;
  if (groupIds.length > 0) {
    for (i = 0; i < groupIds.length; i++) {
      groupData = groupsData[groupIds[i]];
      options = this.groups[groupIds[i]].options;
      if (groupData.length > 0) {
        group = this.groups[groupIds[i]];
        // if bar graphs are stacked, their range need to be handled differently and accumulated over all groups.
        if (options.stack === true && options.style === "bar") {
          if (options.yAxisOrientation === "left") {
            combinedDataLeft = _concatInstanceProperty(combinedDataLeft).call(combinedDataLeft, groupData);
          } else {
            combinedDataRight = _concatInstanceProperty(combinedDataRight).call(combinedDataRight, groupData);
          }
        } else {
          groupRanges[groupIds[i]] = group.getYRange(groupData, groupIds[i]);
        }
      }
    }

    // if bar graphs are stacked, their range need to be handled differently and accumulated over all groups.
    Bargraph.getStackedYRange(combinedDataLeft, groupRanges, groupIds, "__barStackLeft", "left");
    Bargraph.getStackedYRange(combinedDataRight, groupRanges, groupIds, "__barStackRight", "right");
  }
};

/**
 * this sets the Y ranges for the Y axis. It also determines which of the axis should be shown or hidden.
 * @param {Array.<vis.GraphGroup.id>} groupIds
 * @param {Object} groupRanges
 * @returns {boolean} resized
 * @private
 */
LineGraph.prototype._updateYAxis = function (groupIds, groupRanges) {
  var resized = false;
  var yAxisLeftUsed = false;
  var yAxisRightUsed = false;
  var minLeft = 1e9,
    minRight = 1e9,
    maxLeft = -1e9,
    maxRight = -1e9,
    minVal,
    maxVal;
  // if groups are present
  if (groupIds.length > 0) {
    // this is here to make sure that if there are no items in the axis but there are groups, that there is no infinite draw/redraw loop.
    for (var i = 0; i < groupIds.length; i++) {
      var group = this.groups[groupIds[i]];
      if (group && group.options.yAxisOrientation != "right") {
        yAxisLeftUsed = true;
        minLeft = 1e9;
        maxLeft = -1e9;
      } else if (group && group.options.yAxisOrientation) {
        yAxisRightUsed = true;
        minRight = 1e9;
        maxRight = -1e9;
      }
    }

    // if there are items:
    for (i = 0; i < groupIds.length; i++) {
      if (!Object.prototype.hasOwnProperty.call(groupRanges, groupIds[i]) || groupRanges[groupIds[i]].ignore === true) continue;
      minVal = groupRanges[groupIds[i]].min;
      maxVal = groupRanges[groupIds[i]].max;
      if (groupRanges[groupIds[i]].yAxisOrientation != "right") {
        yAxisLeftUsed = true;
        minLeft = minLeft > minVal ? minVal : minLeft;
        maxLeft = maxLeft < maxVal ? maxVal : maxLeft;
      } else {
        yAxisRightUsed = true;
        minRight = minRight > minVal ? minVal : minRight;
        maxRight = maxRight < maxVal ? maxVal : maxRight;
      }
    }
    if (yAxisLeftUsed == true) {
      this.yAxisLeft.setRange(minLeft, maxLeft);
    }
    if (yAxisRightUsed == true) {
      this.yAxisRight.setRange(minRight, maxRight);
    }
  }
  resized = this._toggleAxisVisiblity(yAxisLeftUsed, this.yAxisLeft) || resized;
  resized = this._toggleAxisVisiblity(yAxisRightUsed, this.yAxisRight) || resized;
  if (yAxisRightUsed == true && yAxisLeftUsed == true) {
    this.yAxisLeft.drawIcons = true;
    this.yAxisRight.drawIcons = true;
  } else {
    this.yAxisLeft.drawIcons = false;
    this.yAxisRight.drawIcons = false;
  }
  this.yAxisRight.master = !yAxisLeftUsed;
  this.yAxisRight.masterAxis = this.yAxisLeft;
  if (this.yAxisRight.master == false) {
    if (yAxisRightUsed == true) {
      this.yAxisLeft.lineOffset = this.yAxisRight.width;
    } else {
      this.yAxisLeft.lineOffset = 0;
    }
    resized = this.yAxisLeft.redraw() || resized;
    resized = this.yAxisRight.redraw() || resized;
  } else {
    resized = this.yAxisRight.redraw() || resized;
  }

  // clean the accumulated lists
  var tempGroups = ["__barStackLeft", "__barStackRight", "__lineStackLeft", "__lineStackRight"];
  for (i = 0; i < tempGroups.length; i++) {
    if (_indexOfInstanceProperty(groupIds).call(groupIds, tempGroups[i]) != -1) {
      _spliceInstanceProperty(groupIds).call(groupIds, _indexOfInstanceProperty(groupIds).call(groupIds, tempGroups[i]), 1);
    }
  }
  return resized;
};

/**
 * This shows or hides the Y axis if needed. If there is a change, the changed event is emitted by the updateYAxis function
 *
 * @param {boolean} axisUsed
 * @param {vis.DataAxis}  axis
 * @returns {boolean}
 * @private
 */
LineGraph.prototype._toggleAxisVisiblity = function (axisUsed, axis) {
  var changed = false;
  if (axisUsed == false) {
    if (axis.dom.frame.parentNode && axis.hidden == false) {
      axis.hide();
      changed = true;
    }
  } else {
    if (!axis.dom.frame.parentNode && axis.hidden == true) {
      axis.show();
      changed = true;
    }
  }
  return changed;
};

/**
 * This uses the DataAxis object to generate the correct X coordinate on the SVG window. It uses the
 * util function toScreen to get the x coordinate from the timestamp. It also pre-filters the data and get the minMax ranges for
 * the yAxis.
 *
 * @param {Array.<Object>} datapoints
 * @private
 */
LineGraph.prototype._convertXcoordinates = function (datapoints) {
  var toScreen = this.body.util.toScreen;
  for (var i = 0; i < datapoints.length; i++) {
    datapoints[i].screen_x = toScreen(datapoints[i].x) + this.props.width;
    datapoints[i].screen_y = datapoints[i].y; //starting point for range calculations
    if (datapoints[i].end != undefined) {
      datapoints[i].screen_end = toScreen(datapoints[i].end) + this.props.width;
    } else {
      datapoints[i].screen_end = undefined;
    }
  }
};

/**
 * This uses the DataAxis object to generate the correct X coordinate on the SVG window. It uses the
 * util function toScreen to get the x coordinate from the timestamp. It also pre-filters the data and get the minMax ranges for
 * the yAxis.
 *
 * @param {Array.<Object>} datapoints
 * @param {vis.GraphGroup} group
 * @private
 */
LineGraph.prototype._convertYcoordinates = function (datapoints, group) {
  var axis = this.yAxisLeft;
  var svgHeight = Number(this.svg.style.height.replace("px", ""));
  if (group.options.yAxisOrientation == "right") {
    axis = this.yAxisRight;
  }
  for (var i = 0; i < datapoints.length; i++) {
    datapoints[i].screen_y = Math.round(axis.convertValue(datapoints[i].y));
  }
  group.setZeroPosition(Math.min(svgHeight, axis.convertValue(0)));
};

/**
 * This object contains all possible options. It will check if the types are correct, if required if the option is one
 * of the allowed values.
 *
 * __any__ means that the name of the property does not matter.
 * __type__ is a required field for all objects and contains the allowed types of all objects
 */
let string = "string";
let bool = "boolean";
let number = "number";
let array = "array";
let date = "date";
let object = "object"; // should only be in a __type__ property
let dom = "dom";
let moment = "moment";
let any = "any";
let allOptions = {
  configure: {
    enabled: {
      boolean: bool
    },
    filter: {
      boolean: bool,
      function: "function"
    },
    container: {
      dom
    },
    __type__: {
      object,
      boolean: bool,
      function: "function"
    }
  },
  //globals :
  alignCurrentTime: {
    string,
    undefined: "undefined"
  },
  yAxisOrientation: {
    string: ["left", "right"]
  },
  defaultGroup: {
    string
  },
  sort: {
    boolean: bool
  },
  sampling: {
    boolean: bool
  },
  stack: {
    boolean: bool
  },
  graphHeight: {
    string,
    number
  },
  shaded: {
    enabled: {
      boolean: bool
    },
    orientation: {
      string: ["bottom", "top", "zero", "group"]
    },
    // top, bottom, zero, group
    groupId: {
      object
    },
    __type__: {
      boolean: bool,
      object
    }
  },
  style: {
    string: ["line", "bar", "points"]
  },
  // line, bar
  barChart: {
    width: {
      number
    },
    minWidth: {
      number
    },
    sideBySide: {
      boolean: bool
    },
    align: {
      string: ["left", "center", "right"]
    },
    __type__: {
      object
    }
  },
  interpolation: {
    enabled: {
      boolean: bool
    },
    parametrization: {
      string: ["centripetal", "chordal", "uniform"]
    },
    // uniform (alpha = 0.0), chordal (alpha = 1.0), centripetal (alpha = 0.5)
    alpha: {
      number
    },
    __type__: {
      object,
      boolean: bool
    }
  },
  drawPoints: {
    enabled: {
      boolean: bool
    },
    onRender: {
      function: "function"
    },
    size: {
      number
    },
    style: {
      string: ["square", "circle"]
    },
    // square, circle
    __type__: {
      object,
      boolean: bool,
      function: "function"
    }
  },
  dataAxis: {
    showMinorLabels: {
      boolean: bool
    },
    showMajorLabels: {
      boolean: bool
    },
    showWeekScale: {
      boolean: bool
    },
    icons: {
      boolean: bool
    },
    width: {
      string,
      number
    },
    visible: {
      boolean: bool
    },
    alignZeros: {
      boolean: bool
    },
    left: {
      range: {
        min: {
          number,
          undefined: "undefined"
        },
        max: {
          number,
          undefined: "undefined"
        },
        __type__: {
          object
        }
      },
      format: {
        function: "function"
      },
      title: {
        text: {
          string,
          number,
          undefined: "undefined"
        },
        style: {
          string,
          undefined: "undefined"
        },
        __type__: {
          object
        }
      },
      __type__: {
        object
      }
    },
    right: {
      range: {
        min: {
          number,
          undefined: "undefined"
        },
        max: {
          number,
          undefined: "undefined"
        },
        __type__: {
          object
        }
      },
      format: {
        function: "function"
      },
      title: {
        text: {
          string,
          number,
          undefined: "undefined"
        },
        style: {
          string,
          undefined: "undefined"
        },
        __type__: {
          object
        }
      },
      __type__: {
        object
      }
    },
    __type__: {
      object
    }
  },
  legend: {
    enabled: {
      boolean: bool
    },
    icons: {
      boolean: bool
    },
    left: {
      visible: {
        boolean: bool
      },
      position: {
        string: ["top-right", "bottom-right", "top-left", "bottom-left"]
      },
      __type__: {
        object
      }
    },
    right: {
      visible: {
        boolean: bool
      },
      position: {
        string: ["top-right", "bottom-right", "top-left", "bottom-left"]
      },
      __type__: {
        object
      }
    },
    __type__: {
      object,
      boolean: bool
    }
  },
  groups: {
    visibility: {
      any
    },
    __type__: {
      object
    }
  },
  autoResize: {
    boolean: bool
  },
  throttleRedraw: {
    number
  },
  // TODO: DEPRICATED see https://github.com/almende/vis/issues/2511
  clickToUse: {
    boolean: bool
  },
  end: {
    number,
    date,
    string,
    moment
  },
  format: {
    minorLabels: {
      millisecond: {
        string,
        undefined: "undefined"
      },
      second: {
        string,
        undefined: "undefined"
      },
      minute: {
        string,
        undefined: "undefined"
      },
      hour: {
        string,
        undefined: "undefined"
      },
      weekday: {
        string,
        undefined: "undefined"
      },
      day: {
        string,
        undefined: "undefined"
      },
      week: {
        string,
        undefined: "undefined"
      },
      month: {
        string,
        undefined: "undefined"
      },
      quarter: {
        string,
        undefined: "undefined"
      },
      year: {
        string,
        undefined: "undefined"
      },
      __type__: {
        object
      }
    },
    majorLabels: {
      millisecond: {
        string,
        undefined: "undefined"
      },
      second: {
        string,
        undefined: "undefined"
      },
      minute: {
        string,
        undefined: "undefined"
      },
      hour: {
        string,
        undefined: "undefined"
      },
      weekday: {
        string,
        undefined: "undefined"
      },
      day: {
        string,
        undefined: "undefined"
      },
      week: {
        string,
        undefined: "undefined"
      },
      month: {
        string,
        undefined: "undefined"
      },
      quarter: {
        string,
        undefined: "undefined"
      },
      year: {
        string,
        undefined: "undefined"
      },
      __type__: {
        object
      }
    },
    __type__: {
      object
    }
  },
  moment: {
    function: "function"
  },
  height: {
    string,
    number
  },
  hiddenDates: {
    start: {
      date,
      number,
      string,
      moment
    },
    end: {
      date,
      number,
      string,
      moment
    },
    repeat: {
      string
    },
    __type__: {
      object,
      array
    }
  },
  locale: {
    string
  },
  locales: {
    __any__: {
      any
    },
    __type__: {
      object
    }
  },
  max: {
    date,
    number,
    string,
    moment
  },
  maxHeight: {
    number,
    string
  },
  maxMinorChars: {
    number
  },
  min: {
    date,
    number,
    string,
    moment
  },
  minHeight: {
    number,
    string
  },
  moveable: {
    boolean: bool
  },
  multiselect: {
    boolean: bool
  },
  orientation: {
    string
  },
  showCurrentTime: {
    boolean: bool
  },
  showMajorLabels: {
    boolean: bool
  },
  showMinorLabels: {
    boolean: bool
  },
  showWeekScale: {
    boolean: bool
  },
  snap: {
    function: "function",
    null: "null"
  },
  start: {
    date,
    number,
    string,
    moment
  },
  timeAxis: {
    scale: {
      string,
      undefined: "undefined"
    },
    step: {
      number,
      undefined: "undefined"
    },
    __type__: {
      object
    }
  },
  width: {
    string,
    number
  },
  zoomable: {
    boolean: bool
  },
  zoomKey: {
    string: ["ctrlKey", "altKey", "metaKey", ""]
  },
  zoomMax: {
    number
  },
  zoomMin: {
    number
  },
  zIndex: {
    number
  },
  __type__: {
    object
  }
};
let configureOptions = {
  global: {
    alignCurrentTime: ["none", "year", "month", "quarter", "week", "isoWeek", "day", "date", "hour", "minute", "second"],
    //yAxisOrientation: ['left','right'], // TDOO: enable as soon as Grahp2d doesn't crash when changing this on the fly
    sort: true,
    sampling: true,
    stack: false,
    shaded: {
      enabled: false,
      orientation: ["zero", "top", "bottom", "group"] // zero, top, bottom
    },
    style: ["line", "bar", "points"],
    // line, bar
    barChart: {
      width: [50, 5, 100, 5],
      minWidth: [50, 5, 100, 5],
      sideBySide: false,
      align: ["left", "center", "right"] // left, center, right
    },
    interpolation: {
      enabled: true,
      parametrization: ["centripetal", "chordal", "uniform"] // uniform (alpha = 0.0), chordal (alpha = 1.0), centripetal (alpha = 0.5)
    },
    drawPoints: {
      enabled: true,
      size: [6, 2, 30, 1],
      style: ["square", "circle"] // square, circle
    },
    dataAxis: {
      showMinorLabels: true,
      showMajorLabels: true,
      showWeekScale: false,
      icons: false,
      width: [40, 0, 200, 1],
      visible: true,
      alignZeros: true,
      left: {
        //range: {min:'undefined': 'undefined'ined,max:'undefined': 'undefined'ined},
        //format: function (value) {return value;},
        title: {
          text: "",
          style: ""
        }
      },
      right: {
        //range: {min:'undefined': 'undefined'ined,max:'undefined': 'undefined'ined},
        //format: function (value) {return value;},
        title: {
          text: "",
          style: ""
        }
      }
    },
    legend: {
      enabled: false,
      icons: true,
      left: {
        visible: true,
        position: ["top-right", "bottom-right", "top-left", "bottom-left"] // top/bottom - left,right
      },
      right: {
        visible: true,
        position: ["top-right", "bottom-right", "top-left", "bottom-left"] // top/bottom - left,right
      }
    },
    autoResize: true,
    clickToUse: false,
    end: "",
    format: {
      minorLabels: {
        millisecond: "SSS",
        second: "s",
        minute: "HH:mm",
        hour: "HH:mm",
        weekday: "ddd D",
        day: "D",
        week: "w",
        month: "MMM",
        quarter: "[Q]Q",
        year: "YYYY"
      },
      majorLabels: {
        millisecond: "HH:mm:ss",
        second: "D MMMM HH:mm",
        minute: "ddd D MMMM",
        hour: "ddd D MMMM",
        weekday: "MMMM YYYY",
        day: "MMMM YYYY",
        week: "MMMM YYYY",
        month: "YYYY",
        quarter: "YYYY",
        year: ""
      }
    },
    height: "",
    locale: "",
    max: "",
    maxHeight: "",
    maxMinorChars: [7, 0, 20, 1],
    min: "",
    minHeight: "",
    moveable: true,
    orientation: ["both", "bottom", "top"],
    showCurrentTime: false,
    showMajorLabels: true,
    showMinorLabels: true,
    showWeekScale: false,
    start: "",
    width: "100%",
    zoomable: true,
    zoomKey: ["ctrlKey", "altKey", "metaKey", ""],
    zoomMax: [315360000000000, 10, 315360000000000, 1],
    zoomMin: [10, 10, 315360000000000, 1],
    zIndex: 0
  }
};

/**
 * Create a timeline visualization
 * @param {HTMLElement} container
 * @param {vis.DataSet | Array} [items]
 * @param {vis.DataSet | Array | vis.DataView | Object} [groups]
 * @param {Object} [options]  See Graph2d.setOptions for the available options.
 * @constructor Graph2d
 * @extends Core
 */
function Graph2d(container, items, groups, options) {
  var _context, _context2, _context3, _context4, _context5, _context6, _context7;
  // if the third element is options, the forth is groups (optionally);
  if (!(_Array$isArray(groups) || isDataViewLike(groups)) && groups instanceof Object) {
    var forthArgument = options;
    options = groups;
    groups = forthArgument;
  }

  // TODO: REMOVE THIS in the next MAJOR release
  // see https://github.com/almende/vis/issues/2511
  if (options && options.throttleRedraw) {
    console.warn('Graph2d option "throttleRedraw" is DEPRICATED and no longer supported. It will be removed in the next MAJOR release.');
  }
  var me = this;
  this.defaultOptions = {
    start: null,
    end: null,
    autoResize: true,
    orientation: {
      axis: "bottom",
      // axis orientation: 'bottom', 'top', or 'both'
      item: "bottom" // not relevant for Graph2d
    },
    moment: moment$2,
    width: null,
    height: null,
    maxHeight: null,
    minHeight: null
  };
  this.options = availableUtils.deepExtend({}, this.defaultOptions);

  // Create the DOM, props, and emitter
  this._create(container);

  // all components listed here will be repainted automatically
  this.components = [];
  this.body = {
    dom: this.dom,
    domProps: this.props,
    emitter: {
      on: _bindInstanceProperty(_context = this.on).call(_context, this),
      off: _bindInstanceProperty(_context2 = this.off).call(_context2, this),
      emit: _bindInstanceProperty(_context3 = this.emit).call(_context3, this)
    },
    hiddenDates: [],
    util: {
      getScale() {
        return me.timeAxis.step.scale;
      },
      getStep() {
        return me.timeAxis.step.step;
      },
      toScreen: _bindInstanceProperty(_context4 = me._toScreen).call(_context4, me),
      toGlobalScreen: _bindInstanceProperty(_context5 = me._toGlobalScreen).call(_context5, me),
      // this refers to the root.width
      toTime: _bindInstanceProperty(_context6 = me._toTime).call(_context6, me),
      toGlobalTime: _bindInstanceProperty(_context7 = me._toGlobalTime).call(_context7, me)
    }
  };

  // range
  this.range = new Range(this.body);
  this.components.push(this.range);
  this.body.range = this.range;

  // time axis
  this.timeAxis = new TimeAxis(this.body);
  this.components.push(this.timeAxis);
  //this.body.util.snap = this.timeAxis.snap.bind(this.timeAxis);

  // current time bar
  this.currentTime = new CurrentTime(this.body);
  this.components.push(this.currentTime);

  // item set
  this.linegraph = new LineGraph(this.body);
  this.components.push(this.linegraph);
  this.itemsData = null; // DataSet
  this.groupsData = null; // DataSet

  this.on("tap", function (event) {
    me.emit("click", me.getEventProperties(event));
  });
  this.on("doubletap", function (event) {
    me.emit("doubleClick", me.getEventProperties(event));
  });
  this.dom.root.oncontextmenu = function (event) {
    me.emit("contextmenu", me.getEventProperties(event));
  };

  //Single time autoscale/fit
  this.initialFitDone = false;
  this.on("changed", function () {
    if (me.itemsData == null) return;
    if (!me.initialFitDone && !me.options.rollingMode) {
      me.initialFitDone = true;
      if (me.options.start != undefined || me.options.end != undefined) {
        if (me.options.start == undefined || me.options.end == undefined) {
          var range = me.getItemRange();
        }
        var start = me.options.start != undefined ? me.options.start : range.min;
        var end = me.options.end != undefined ? me.options.end : range.max;
        me.setWindow(start, end, {
          animation: false
        });
      } else {
        me.fit({
          animation: false
        });
      }
    }
    if (!me.initialDrawDone && (me.initialRangeChangeDone || !me.options.start && !me.options.end || me.options.rollingMode)) {
      me.initialDrawDone = true;
      me.dom.root.style.visibility = "visible";
      me.dom.loadingScreen.parentNode.removeChild(me.dom.loadingScreen);
      if (me.options.onInitialDrawComplete) {
        _setTimeout(() => {
          return me.options.onInitialDrawComplete();
        }, 0);
      }
    }
  });

  // apply options
  if (options) {
    this.setOptions(options);
  }

  // IMPORTANT: THIS HAPPENS BEFORE SET ITEMS!
  if (groups) {
    this.setGroups(groups);
  }

  // create itemset
  if (items) {
    this.setItems(items);
  }

  // draw for the first time
  this._redraw();
}

// Extend the functionality from Core
Graph2d.prototype = new Core();
Graph2d.prototype.setOptions = function (options) {
  // validate options
  let errorFound = Validator.validate(options, allOptions);
  if (errorFound === true) {
    console.log("%cErrors have been found in the supplied options object.", printStyle);
  }
  Core.prototype.setOptions.call(this, options);
};

/**
 * Set items
 * @param {vis.DataSet | Array | null} items
 */
Graph2d.prototype.setItems = function (items) {
  var initialLoad = this.itemsData == null;

  // convert to type DataSet when needed
  var newDataSet;
  if (!items) {
    newDataSet = null;
  } else if (isDataViewLike(items)) {
    newDataSet = typeCoerceDataSet(items);
  } else {
    // turn an array into a dataset
    newDataSet = typeCoerceDataSet(new DataSet(items));
  }

  // set items
  if (this.itemsData) {
    // stop maintaining a coerced version of the old data set
    this.itemsData.dispose();
  }
  this.itemsData = newDataSet;
  this.linegraph && this.linegraph.setItems(newDataSet != null ? newDataSet.rawDS : null);
  if (initialLoad) {
    if (this.options.start != undefined || this.options.end != undefined) {
      var start = this.options.start != undefined ? this.options.start : null;
      var end = this.options.end != undefined ? this.options.end : null;
      this.setWindow(start, end, {
        animation: false
      });
    } else {
      this.fit({
        animation: false
      });
    }
  }
};

/**
 * Set groups
 * @param {vis.DataSet | Array} groups
 */
Graph2d.prototype.setGroups = function (groups) {
  // convert to type DataSet when needed
  var newDataSet;
  if (!groups) {
    newDataSet = null;
  } else if (isDataViewLike(groups)) {
    newDataSet = groups;
  } else {
    // turn an array into a dataset
    newDataSet = new DataSet(groups);
  }
  this.groupsData = newDataSet;
  this.linegraph.setGroups(newDataSet);
};

/**
 * Returns an object containing an SVG element with the icon of the group (size determined by iconWidth and iconHeight), the label of the group (content) and the yAxisOrientation of the group (left or right).
 * @param {vis.GraphGroup.id} groupId
 * @param {number} width
 * @param {number} height
 * @returns {{icon: SVGElement, label: string, orientation: string}|string}
 */
Graph2d.prototype.getLegend = function (groupId, width, height) {
  if (width === undefined) {
    width = 15;
  }
  if (height === undefined) {
    height = 15;
  }
  if (this.linegraph.groups[groupId] !== undefined) {
    return this.linegraph.groups[groupId].getLegend(width, height);
  } else {
    return "cannot find group:'" + groupId + "'";
  }
};

/**
 * This checks if the visible option of the supplied group (by ID) is true or false.
 * @param {vis.GraphGroup.id} groupId
 * @returns {boolean}
 */
Graph2d.prototype.isGroupVisible = function (groupId) {
  if (this.linegraph.groups[groupId] !== undefined) {
    return this.linegraph.groups[groupId].visible && (this.linegraph.options.groups.visibility[groupId] === undefined || this.linegraph.options.groups.visibility[groupId] == true);
  } else {
    return false;
  }
};

/**
 * Get the data range of the item set.
 * @returns {{min: Date, max: Date}} range  A range with a start and end Date.
 *                                          When no minimum is found, min==null
 *                                          When no maximum is found, max==null
 */
Graph2d.prototype.getDataRange = function () {
  var min = null;
  var max = null;

  // calculate min from start filed
  for (var groupId in this.linegraph.groups) {
    if (!Object.prototype.hasOwnProperty.call(this.linegraph.groups, groupId) || this.linegraph.groups[groupId].visible !== true) continue;
    for (var i = 0; i < this.linegraph.groups[groupId].itemsData.length; i++) {
      var item = this.linegraph.groups[groupId].itemsData[i];
      var value = availableUtils.convert(item.x, "Date").valueOf();
      min = min == null ? value : min > value ? value : min;
      max = max == null ? value : max < value ? value : max;
    }
  }
  return {
    min: min != null ? new Date(min) : null,
    max: max != null ? new Date(max) : null
  };
};

/**
 * Generate Timeline related information from an event
 * @param {Event} event
 * @return {Object} An object with related information, like on which area
 *                  The event happened, whether clicked on an item, etc.
 */
Graph2d.prototype.getEventProperties = function (event) {
  var clientX = event.center ? event.center.x : event.clientX;
  var clientY = event.center ? event.center.y : event.clientY;
  var x = clientX - availableUtils.getAbsoluteLeft(this.dom.centerContainer);
  var y = clientY - availableUtils.getAbsoluteTop(this.dom.centerContainer);
  var time = this._toTime(x);
  var customTime = CustomTime.customTimeFromTarget(event);
  var element = availableUtils.getTarget(event);
  var what = null;
  if (availableUtils.hasParent(element, this.timeAxis.dom.foreground)) {
    what = "axis";
  } else if (this.timeAxis2 && availableUtils.hasParent(element, this.timeAxis2.dom.foreground)) {
    what = "axis";
  } else if (availableUtils.hasParent(element, this.linegraph.yAxisLeft.dom.frame)) {
    what = "data-axis";
  } else if (availableUtils.hasParent(element, this.linegraph.yAxisRight.dom.frame)) {
    what = "data-axis";
  } else if (availableUtils.hasParent(element, this.linegraph.legendLeft.dom.frame)) {
    what = "legend";
  } else if (availableUtils.hasParent(element, this.linegraph.legendRight.dom.frame)) {
    what = "legend";
  } else if (customTime != null) {
    what = "custom-time";
  } else if (availableUtils.hasParent(element, this.currentTime.bar)) {
    what = "current-time";
  } else if (availableUtils.hasParent(element, this.dom.center)) {
    what = "background";
  }
  var value = [];
  var yAxisLeft = this.linegraph.yAxisLeft;
  var yAxisRight = this.linegraph.yAxisRight;
  if (!yAxisLeft.hidden && this.itemsData.length > 0) {
    value.push(yAxisLeft.screenToValue(y));
  }
  if (!yAxisRight.hidden && this.itemsData.length > 0) {
    value.push(yAxisRight.screenToValue(y));
  }
  return {
    event: event,
    customTime: customTime ? customTime.options.id : null,
    what: what,
    pageX: event.srcEvent ? event.srcEvent.pageX : event.pageX,
    pageY: event.srcEvent ? event.srcEvent.pageY : event.pageY,
    x: x,
    y: y,
    time: time,
    value: value
  };
};

/**
 * Load a configurator
 * @return {Object}
 * @private
 */
Graph2d.prototype._createConfigurator = function () {
  return new Configurator(this, this.dom.container, configureOptions);
};

// Locales have to be supplied by the user.

const defaultLanguage = getNavigatorLanguage();
moment$3.locale(defaultLanguage);
const timeline = {
  Core,
  DateUtil,
  Range,
  stack: stack$1,
  TimeStep,
  components: {
    items: {
      Item,
      BackgroundItem,
      BoxItem,
      ClusterItem,
      PointItem,
      RangeItem
    },
    BackgroundGroup,
    Component,
    CurrentTime,
    CustomTime,
    DataAxis,
    DataScale,
    GraphGroup,
    Group,
    ItemSet,
    Legend,
    LineGraph,
    TimeAxis
  }
};

export { Graph2d, Timeline, timeline };
//# sourceMappingURL=vis-timeline-graph2d.mjs.map