preact/aliases.js

(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
  typeof define === 'function' && define.amd ? define(['exports'], factory) :
  (factory((global.preact = global.preact || {})));
}(this, function (exports) {

  function VNode(nodeName, attributes, children) {
  	/** @type {string|function} */
  	this.nodeName = nodeName;

  	/** @type {object<string>|undefined} */
  	this.attributes = attributes;

  	/** @type {array<VNode>|undefined} */
  	this.children = children;

  	/** Reference to the given key. */
  	this.key = attributes && attributes.key;
  }

  var options = {

  	/** If `true`, `prop` changes trigger synchronous component updates.
    *	@name syncComponentUpdates
    *	@type Boolean
    *	@default true
    */
  	//syncComponentUpdates: true,

  	/** Processes all created VNodes.
    *	@param {VNode} vnode	A newly-created VNode to normalize/process
    */
  	//vnode(vnode) { }

  	/** Hook invoked after a component is mounted. */
  	// afterMount(component) { }

  	/** Hook invoked after the DOM is updated with a component's latest render. */
  	// afterUpdate(component) { }

  	/** Hook invoked immediately before a component is unmounted. */
  	// beforeUnmount(component) { }
  };

  var stack = [];

  /** JSX/hyperscript reviver
  *	Benchmarks: https://esbench.com/bench/57ee8f8e330ab09900a1a1a0
   *	@see http://jasonformat.com/wtf-is-jsx
   *	@public
   *  @example
   *  /** @jsx h *\/
   *  import { render, h } from 'preact';
   *  render(<span>foo</span>, document.body);
   */

  function h(nodeName, attributes) {
  	var children = [],
  	    lastSimple = undefined,
  	    child = undefined,
  	    simple = undefined,
  	    i = undefined;
  	for (i = arguments.length; i-- > 2;) {
  		stack.push(arguments[i]);
  	}
  	if (attributes && attributes.children) {
  		if (!stack.length) stack.push(attributes.children);
  		delete attributes.children;
  	}
  	while (stack.length) {
  		if ((child = stack.pop()) instanceof Array) {
  			for (i = child.length; i--;) stack.push(child[i]);
  		} else if (child != null && child !== false) {
  			if (typeof child == 'number' || child === true) child = String(child);
  			simple = typeof child == 'string';
  			if (simple && lastSimple) {
  				children[children.length - 1] += child;
  			} else {
  				children.push(child);
  				lastSimple = simple;
  			}
  		}
  	}

  	var p = new VNode(nodeName, attributes || undefined, children);

  	// if a "vnode hook" is defined, pass every created VNode to it
  	if (options.vnode) options.vnode(p);

  	return p;
  }

  function extend(obj, props) {
  	if (props) {
  		for (var i in props) {
  			obj[i] = props[i];
  		}
  	}
  	return obj;
  }

  /** Fast clone. Note: does not filter out non-own properties.
   *	@see https://esbench.com/bench/56baa34f45df6895002e03b6
   */

  function clone(obj) {
  	return extend({}, obj);
  }

  /** Get a deep property value from the given object, expressed in dot-notation.
   *	@private
   */

  function delve(obj, key) {
  	for (var p = key.split('.'), i = 0; i < p.length && obj; i++) {
  		obj = obj[p[i]];
  	}
  	return obj;
  }

  /** @private is the given object a Function? */

  function isFunction(obj) {
  	return 'function' === typeof obj;
  }

  /** @private is the given object a String? */

  function isString(obj) {
  	return 'string' === typeof obj;
  }

  /** Convert a hashmap of CSS classes to a space-delimited className string
   *	@private
   */

  function hashToClassName(c) {
  	var str = '';
  	for (var prop in c) {
  		if (c[prop]) {
  			if (str) str += ' ';
  			str += prop;
  		}
  	}
  	return str;
  }

  /** Just a memoized String#toLowerCase */
  var lcCache = {};
  var toLowerCase = function toLowerCase(s) {
  	return lcCache[s] || (lcCache[s] = s.toLowerCase());
  };

  /** Call a function asynchronously, as soon as possible.
   *	@param {Function} callback
   */
  var resolved = typeof Promise !== 'undefined' && Promise.resolve();
  var defer = resolved ? function (f) {
  	resolved.then(f);
  } : setTimeout;

  function cloneElement(vnode, props) {
  	return h(vnode.nodeName, extend(clone(vnode.attributes), props), arguments.length > 2 ? [].slice.call(arguments, 2) : vnode.children);
  }

  var NO_RENDER = 0;
  var SYNC_RENDER = 1;
  var FORCE_RENDER = 2;
  var ASYNC_RENDER = 3;

  var EMPTY = {};

  var ATTR_KEY = typeof Symbol !== 'undefined' ? Symbol['for']('preactattr') : '__preactattr_';

  // DOM properties that should NOT have "px" added when numeric
  var NON_DIMENSION_PROPS = {
  	boxFlex: 1, boxFlexGroup: 1, columnCount: 1, fillOpacity: 1, flex: 1, flexGrow: 1,
  	flexPositive: 1, flexShrink: 1, flexNegative: 1, fontWeight: 1, lineClamp: 1, lineHeight: 1,
  	opacity: 1, order: 1, orphans: 1, strokeOpacity: 1, widows: 1, zIndex: 1, zoom: 1
  };

  // DOM event types that do not bubble and should be attached via useCapture
  var NON_BUBBLING_EVENTS = { blur: 1, error: 1, focus: 1, load: 1, resize: 1, scroll: 1 };

  /** Create an Event handler function that sets a given state property.
   *	@param {Component} component	The component whose state should be updated
   *	@param {string} key				A dot-notated key path to update in the component's state
   *	@param {string} eventPath		A dot-notated key path to the value that should be retrieved from the Event or component
   *	@returns {function} linkedStateHandler
   *	@private
   */

  function createLinkedState(component, key, eventPath) {
  	var path = key.split('.');
  	return function (e) {
  		var t = e && e.target || this,
  		    state = {},
  		    obj = state,
  		    v = isString(eventPath) ? delve(e, eventPath) : t.nodeName ? t.type.match(/^che|rad/) ? t.checked : t.value : e,
  		    i = 0;
  		for (; i < path.length - 1; i++) {
  			obj = obj[path[i]] || (obj[path[i]] = !i && component.state[path[i]] || {});
  		}
  		obj[path[i]] = v;
  		component.setState(state);
  	};
  }

  /** Managed queue of dirty components to be re-rendered */

  // items/itemsOffline swap on each rerender() call (just a simple pool technique)
  var items = [];

  function enqueueRender(component) {
  	if (!component._dirty && (component._dirty = true) && items.push(component) == 1) {
  		(options.debounceRendering || defer)(rerender);
  	}
  }

  function rerender() {
  	var p = undefined,
  	    list = items;
  	items = [];
  	while (p = list.pop()) {
  		if (p._dirty) renderComponent(p);
  	}
  }

  /** Check if a VNode is a reference to a stateless functional component.
   *	A function component is represented as a VNode whose `nodeName` property is a reference to a function.
   *	If that function is not a Component (ie, has no `.render()` method on a prototype), it is considered a stateless functional component.
   *	@param {VNode} vnode	A VNode
   *	@private
   */

  function isFunctionalComponent(vnode) {
    var nodeName = vnode && vnode.nodeName;
    return nodeName && isFunction(nodeName) && !(nodeName.prototype && nodeName.prototype.render);
  }

  /** Construct a resultant VNode from a VNode referencing a stateless functional component.
   *	@param {VNode} vnode	A VNode with a `nodeName` property that is a reference to a function.
   *	@private
   */

  function buildFunctionalComponent(vnode, context) {
    return vnode.nodeName(getNodeProps(vnode), context || EMPTY);
  }

  /** Check if two nodes are equivalent.
   *	@param {Element} node
   *	@param {VNode} vnode
   *	@private
   */

  function isSameNodeType(node, vnode) {
  	if (isString(vnode)) {
  		return node instanceof Text;
  	}
  	if (isString(vnode.nodeName)) {
  		return isNamedNode(node, vnode.nodeName);
  	}
  	if (isFunction(vnode.nodeName)) {
  		return node._componentConstructor === vnode.nodeName || isFunctionalComponent(vnode);
  	}
  }

  function isNamedNode(node, nodeName) {
  	return node.normalizedNodeName === nodeName || toLowerCase(node.nodeName) === toLowerCase(nodeName);
  }

  /**
   * Reconstruct Component-style `props` from a VNode.
   * Ensures default/fallback values from `defaultProps`:
   * Own-properties of `defaultProps` not present in `vnode.attributes` are added.
   * @param {VNode} vnode
   * @returns {Object} props
   */

  function getNodeProps(vnode) {
  	var props = clone(vnode.attributes);
  	props.children = vnode.children;

  	var defaultProps = vnode.nodeName.defaultProps;
  	if (defaultProps) {
  		for (var i in defaultProps) {
  			if (props[i] === undefined) {
  				props[i] = defaultProps[i];
  			}
  		}
  	}

  	return props;
  }

  /** Removes a given DOM Node from its parent. */

  function removeNode(node) {
  	var p = node.parentNode;
  	if (p) p.removeChild(node);
  }

  /** Set a named attribute on the given Node, with special behavior for some names and event handlers.
   *	If `value` is `null`, the attribute/handler will be removed.
   *	@param {Element} node	An element to mutate
   *	@param {string} name	The name/key to set, such as an event or attribute name
   *	@param {any} value		An attribute value, such as a function to be used as an event handler
   *	@param {any} previousValue	The last value that was set for this name/node pair
   *	@private
   */

  function setAccessor(node, name, old, value, isSvg) {

  	if (name === 'className') name = 'class';

  	if (name === 'class' && value && typeof value === 'object') {
  		value = hashToClassName(value);
  	}

  	if (name === 'key') {
  		// ignore
  	} else if (name === 'class' && !isSvg) {
  			node.className = value || '';
  		} else if (name === 'style') {
  			if (!value || isString(value) || isString(old)) {
  				node.style.cssText = value || '';
  			}
  			if (value && typeof value === 'object') {
  				if (!isString(old)) {
  					for (var i in old) {
  						if (!(i in value)) node.style[i] = '';
  					}
  				}
  				for (var i in value) {
  					node.style[i] = typeof value[i] === 'number' && !NON_DIMENSION_PROPS[i] ? value[i] + 'px' : value[i];
  				}
  			}
  		} else if (name === 'dangerouslySetInnerHTML') {
  			if (value) node.innerHTML = value.__html;
  		} else if (name[0] == 'o' && name[1] == 'n') {
  			var l = node._listeners || (node._listeners = {});
  			name = toLowerCase(name.substring(2));
  			// @TODO: this might be worth it later, un-breaks focus/blur bubbling in IE9:
  			// if (node.attachEvent) name = name=='focus'?'focusin':name=='blur'?'focusout':name;
  			if (value) {
  				if (!l[name]) node.addEventListener(name, eventProxy, !!NON_BUBBLING_EVENTS[name]);
  			} else if (l[name]) {
  				node.removeEventListener(name, eventProxy, !!NON_BUBBLING_EVENTS[name]);
  			}
  			l[name] = value;
  		} else if (name !== 'list' && name !== 'type' && !isSvg && name in node) {
  			setProperty(node, name, value == null ? '' : value);
  			if (value == null || value === false) node.removeAttribute(name);
  		} else {
  			var ns = isSvg && name.match(/^xlink\:?(.+)/);
  			if (value == null || value === false) {
  				if (ns) node.removeAttributeNS('http://www.w3.org/1999/xlink', toLowerCase(ns[1]));else node.removeAttribute(name);
  			} else if (typeof value !== 'object' && !isFunction(value)) {
  				if (ns) node.setAttributeNS('http://www.w3.org/1999/xlink', toLowerCase(ns[1]), value);else node.setAttribute(name, value);
  			}
  		}
  }

  /** Attempt to set a DOM property to the given value.
   *	IE & FF throw for certain property-value combinations.
   */
  function setProperty(node, name, value) {
  	try {
  		node[name] = value;
  	} catch (e) {}
  }

  /** Proxy an event to hooked event handlers
   *	@private
   */
  function eventProxy(e) {
  	return this._listeners[e.type](options.event && options.event(e) || e);
  }

  /** DOM node pool, keyed on nodeName. */

  var nodes = {};

  function collectNode(node) {
  	removeNode(node);

  	if (node instanceof Element) {
  		node._component = node._componentConstructor = null;

  		var _name = node.normalizedNodeName || toLowerCase(node.nodeName);
  		(nodes[_name] || (nodes[_name] = [])).push(node);
  	}
  }

  function createNode(nodeName, isSvg) {
  	var name = toLowerCase(nodeName),
  	    node = nodes[name] && nodes[name].pop() || (isSvg ? document.createElementNS('http://www.w3.org/2000/svg', nodeName) : document.createElement(nodeName));
  	node.normalizedNodeName = name;
  	return node;
  }

  /** Diff recursion count, used to track the end of the diff cycle. */
  var mounts = [];

  /** Diff recursion count, used to track the end of the diff cycle. */
  var diffLevel = 0;

  var isSvgMode = false;

  function flushMounts() {
  	var c = undefined;
  	while (c = mounts.pop()) {
  		if (options.afterMount) options.afterMount(c);
  		if (c.componentDidMount) c.componentDidMount();
  	}
  }

  /** Apply differences in a given vnode (and it's deep children) to a real DOM Node.
   *	@param {Element} [dom=null]		A DOM node to mutate into the shape of the `vnode`
   *	@param {VNode} vnode			A VNode (with descendants forming a tree) representing the desired DOM structure
   *	@returns {Element} dom			The created/mutated element
   *	@private
   */

  function diff(dom, vnode, context, mountAll, parent, componentRoot) {
  	if (! diffLevel++) isSvgMode = parent instanceof SVGElement;
  	var ret = idiff(dom, vnode, context, mountAll);
  	if (parent && ret.parentNode !== parent) parent.appendChild(ret);
  	if (! --diffLevel && !componentRoot) flushMounts();
  	return ret;
  }

  function idiff(dom, vnode, context, mountAll) {
  	var originalAttributes = vnode && vnode.attributes;

  	while (isFunctionalComponent(vnode)) {
  		vnode = buildFunctionalComponent(vnode, context);
  	}

  	if (vnode == null) vnode = '';

  	if (isString(vnode)) {
  		if (dom) {
  			if (dom instanceof Text && dom.parentNode) {
  				if (dom.nodeValue != vnode) {
  					dom.nodeValue = vnode;
  				}
  				return dom;
  			}
  			recollectNodeTree(dom);
  		}
  		return document.createTextNode(vnode);
  	}

  	if (isFunction(vnode.nodeName)) {
  		return buildComponentFromVNode(dom, vnode, context, mountAll);
  	}

  	var out = dom,
  	    nodeName = vnode.nodeName,
  	    prevSvgMode = isSvgMode,
  	    vchildren = vnode.children;

  	if (!isString(nodeName)) {
  		nodeName = String(nodeName);
  	}

  	isSvgMode = nodeName === 'svg' ? true : nodeName === 'foreignObject' ? false : isSvgMode;

  	if (!dom) {
  		out = createNode(nodeName, isSvgMode);
  	} else if (!isNamedNode(dom, nodeName)) {
  		out = createNode(nodeName, isSvgMode);
  		// move children into the replacement node
  		while (dom.firstChild) out.appendChild(dom.firstChild);
  		// reclaim element nodes
  		recollectNodeTree(dom);
  	}

  	// fast-path for elements containing a single TextNode:
  	if (vchildren && vchildren.length === 1 && typeof vchildren[0] === 'string' && out.childNodes.length === 1 && out.firstChild instanceof Text) {
  		if (out.firstChild.nodeValue != vchildren[0]) {
  			out.firstChild.nodeValue = vchildren[0];
  		}
  	} else if (vchildren && vchildren.length || out.firstChild) {
  		innerDiffNode(out, vchildren, context, mountAll);
  	}

  	var props = out[ATTR_KEY];
  	if (!props) {
  		out[ATTR_KEY] = props = {};
  		for (var a = out.attributes, i = a.length; i--;) {
  			props[a[i].name] = a[i].value;
  		}
  	}

  	diffAttributes(out, vnode.attributes, props);

  	if (originalAttributes && typeof originalAttributes.ref === 'function') {
  		(props.ref = originalAttributes.ref)(out);
  	}

  	isSvgMode = prevSvgMode;

  	return out;
  }

  /** Apply child and attribute changes between a VNode and a DOM Node to the DOM. */
  function innerDiffNode(dom, vchildren, context, mountAll) {
  	var originalChildren = dom.childNodes,
  	    children = [],
  	    keyed = {},
  	    keyedLen = 0,
  	    min = 0,
  	    len = originalChildren.length,
  	    childrenLen = 0,
  	    vlen = vchildren && vchildren.length,
  	    j = undefined,
  	    c = undefined,
  	    vchild = undefined,
  	    child = undefined;

  	if (len) {
  		for (var i = 0; i < len; i++) {
  			var _child = originalChildren[i],
  			    key = vlen ? (c = _child._component) ? c.__key : (c = _child[ATTR_KEY]) ? c.key : null : null;
  			if (key || key === 0) {
  				keyedLen++;
  				keyed[key] = _child;
  			} else {
  				children[childrenLen++] = _child;
  			}
  		}
  	}

  	if (vlen) {
  		for (var i = 0; i < vlen; i++) {
  			vchild = vchildren[i];
  			child = null;

  			// if (isFunctionalComponent(vchild)) {
  			// 	vchild = buildFunctionalComponent(vchild);
  			// }

  			// attempt to find a node based on key matching
  			var key = vchild.key;
  			if (key != null) {
  				if (keyedLen && key in keyed) {
  					child = keyed[key];
  					keyed[key] = undefined;
  					keyedLen--;
  				}
  			}
  			// attempt to pluck a node of the same type from the existing children
  			else if (!child && min < childrenLen) {
  					for (j = min; j < childrenLen; j++) {
  						c = children[j];
  						if (c && isSameNodeType(c, vchild)) {
  							child = c;
  							children[j] = undefined;
  							if (j === childrenLen - 1) childrenLen--;
  							if (j === min) min++;
  							break;
  						}
  					}
  					if (!child && min < childrenLen && isFunction(vchild.nodeName) && mountAll) {
  						child = children[min];
  						children[min++] = undefined;
  					}
  				}

  			// morph the matched/found/created DOM child to match vchild (deep)
  			child = idiff(child, vchild, context, mountAll);

  			if (child && child !== dom && child !== originalChildren[i]) {
  				dom.insertBefore(child, originalChildren[i] || null);
  			}
  		}
  	}

  	if (keyedLen) {
  		for (var i in keyed) {
  			if (keyed[i]) recollectNodeTree(keyed[i]);
  		}
  	}

  	// remove orphaned children
  	if (min < childrenLen) {
  		removeOrphanedChildren(children);
  	}
  }

  /** Reclaim children that were unreferenced in the desired VTree */

  function removeOrphanedChildren(children, unmountOnly) {
  	for (var i = children.length; i--;) {
  		if (children[i]) {
  			recollectNodeTree(children[i], unmountOnly);
  		}
  	}
  }

  /** Reclaim an entire tree of nodes, starting at the root. */

  function recollectNodeTree(node, unmountOnly) {
  	// @TODO: Need to make a call on whether Preact should remove nodes not created by itself.
  	// Currently it *does* remove them. Discussion: https://github.com/developit/preact/issues/39
  	//if (!node[ATTR_KEY]) return;

  	var component = node._component;
  	if (component) {
  		unmountComponent(component, !unmountOnly);
  	} else {
  		if (node[ATTR_KEY] && node[ATTR_KEY].ref) node[ATTR_KEY].ref(null);

  		if (!unmountOnly) {
  			collectNode(node);
  		}

  		if (node.childNodes && node.childNodes.length) {
  			removeOrphanedChildren(node.childNodes, unmountOnly);
  		}
  	}
  }

  /** Apply differences in attributes from a VNode to the given DOM Node. */
  function diffAttributes(dom, attrs, old) {
  	for (var _name in old) {
  		if (!(attrs && _name in attrs) && old[_name] != null) {
  			setAccessor(dom, _name, old[_name], old[_name] = undefined, isSvgMode);
  		}
  	}

  	// new & updated
  	if (attrs) {
  		for (var _name2 in attrs) {
  			if (_name2 !== 'children' && _name2 !== 'innerHTML' && (!(_name2 in old) || attrs[_name2] !== (_name2 === 'value' || _name2 === 'checked' ? dom[_name2] : old[_name2]))) {
  				setAccessor(dom, _name2, old[_name2], old[_name2] = attrs[_name2], isSvgMode);
  			}
  		}
  	}
  }

  /** Retains a pool of Components for re-use, keyed on component name.
   *	Note: since component names are not unique or even necessarily available, these are primarily a form of sharding.
   *	@private
   */
  var components = {};

  function collectComponent(component) {
  	var name = component.constructor.name,
  	    list = components[name];
  	if (list) list.push(component);else components[name] = [component];
  }

  function createComponent(Ctor, props, context) {
  	var inst = new Ctor(props, context),
  	    list = components[Ctor.name];
  	Component.call(inst, props, context);
  	if (list) {
  		for (var i = list.length; i--;) {
  			if (list[i].constructor === Ctor) {
  				inst.nextBase = list[i].nextBase;
  				list.splice(i, 1);
  				break;
  			}
  		}
  	}
  	return inst;
  }

  /** Set a component's `props` (generally derived from JSX attributes).
   *	@param {Object} props
   *	@param {Object} [opts]
   *	@param {boolean} [opts.renderSync=false]	If `true` and {@link options.syncComponentUpdates} is `true`, triggers synchronous rendering.
   *	@param {boolean} [opts.render=true]			If `false`, no render will be triggered.
   */

  function setComponentProps(component, props, opts, context, mountAll) {
  	if (component._disable) return;
  	component._disable = true;

  	if (component.__ref = props.ref) delete props.ref;
  	if (component.__key = props.key) delete props.key;

  	if (!component.base || mountAll) {
  		if (component.componentWillMount) component.componentWillMount();
  	} else if (component.componentWillReceiveProps) {
  		component.componentWillReceiveProps(props, context);
  	}

  	if (context && context !== component.context) {
  		if (!component.prevContext) component.prevContext = component.context;
  		component.context = context;
  	}

  	if (!component.prevProps) component.prevProps = component.props;
  	component.props = props;

  	component._disable = false;

  	if (opts !== NO_RENDER) {
  		if (opts === SYNC_RENDER || options.syncComponentUpdates !== false || !component.base) {
  			renderComponent(component, SYNC_RENDER, mountAll);
  		} else {
  			enqueueRender(component);
  		}
  	}

  	if (component.__ref) component.__ref(component);
  }

  /** Render a Component, triggering necessary lifecycle events and taking High-Order Components into account.
   *	@param {Component} component
   *	@param {Object} [opts]
   *	@param {boolean} [opts.build=false]		If `true`, component will build and store a DOM node if not already associated with one.
   *	@private
   */

  function renderComponent(component, opts, mountAll, isChild) {
  	if (component._disable) return;

  	var skip = undefined,
  	    rendered = undefined,
  	    props = component.props,
  	    state = component.state,
  	    context = component.context,
  	    previousProps = component.prevProps || props,
  	    previousState = component.prevState || state,
  	    previousContext = component.prevContext || context,
  	    isUpdate = component.base,
  	    nextBase = component.nextBase,
  	    initialBase = isUpdate || nextBase,
  	    initialChildComponent = component._component,
  	    inst = undefined,
  	    cbase = undefined;

  	// if updating
  	if (isUpdate) {
  		component.props = previousProps;
  		component.state = previousState;
  		component.context = previousContext;
  		if (opts !== FORCE_RENDER && component.shouldComponentUpdate && component.shouldComponentUpdate(props, state, context) === false) {
  			skip = true;
  		} else if (component.componentWillUpdate) {
  			component.componentWillUpdate(props, state, context);
  		}
  		component.props = props;
  		component.state = state;
  		component.context = context;
  	}

  	component.prevProps = component.prevState = component.prevContext = component.nextBase = null;
  	component._dirty = false;

  	if (!skip) {
  		if (component.render) rendered = component.render(props, state, context);

  		// context to pass to the child, can be updated via (grand-)parent component
  		if (component.getChildContext) {
  			context = extend(clone(context), component.getChildContext());
  		}

  		while (isFunctionalComponent(rendered)) {
  			rendered = buildFunctionalComponent(rendered, context);
  		}

  		var childComponent = rendered && rendered.nodeName,
  		    toUnmount = undefined,
  		    base = undefined;

  		if (isFunction(childComponent)) {
  			// set up high order component link

  			inst = initialChildComponent;
  			var childProps = getNodeProps(rendered);

  			if (inst && inst.constructor === childComponent) {
  				setComponentProps(inst, childProps, SYNC_RENDER, context);
  			} else {
  				toUnmount = inst;

  				inst = createComponent(childComponent, childProps, context);
  				inst.nextBase = inst.nextBase || nextBase;
  				inst._parentComponent = component;
  				component._component = inst;
  				setComponentProps(inst, childProps, NO_RENDER, context);
  				renderComponent(inst, SYNC_RENDER, mountAll, true);
  			}

  			base = inst.base;
  		} else {
  			cbase = initialBase;

  			// destroy high order component link
  			toUnmount = initialChildComponent;
  			if (toUnmount) {
  				cbase = component._component = null;
  			}

  			if (initialBase || opts === SYNC_RENDER) {
  				if (cbase) cbase._component = null;
  				base = diff(cbase, rendered, context, mountAll || !isUpdate, initialBase && initialBase.parentNode, true);
  			}
  		}

  		if (initialBase && base !== initialBase && inst !== initialChildComponent) {
  			var baseParent = initialBase.parentNode;
  			if (baseParent && base !== baseParent) {
  				baseParent.replaceChild(base, initialBase);

  				if (!toUnmount) {
  					initialBase._component = null;
  					recollectNodeTree(initialBase);
  				}
  			}
  		}

  		if (toUnmount) {
  			unmountComponent(toUnmount, base !== initialBase);
  		}

  		component.base = base;
  		if (base && !isChild) {
  			var componentRef = component,
  			    t = component;
  			while (t = t._parentComponent) {
  				(componentRef = t).base = base;
  			}
  			base._component = componentRef;
  			base._componentConstructor = componentRef.constructor;
  		}
  	}

  	if (!isUpdate || mountAll) {
  		mounts.unshift(component);
  	} else if (!skip) {
  		if (component.componentDidUpdate) {
  			component.componentDidUpdate(previousProps, previousState, previousContext);
  		}
  		if (options.afterUpdate) options.afterUpdate(component);
  	}

  	var cb = component._renderCallbacks,
  	    fn = undefined;
  	if (cb) while (fn = cb.pop()) fn.call(component);

  	if (!diffLevel && !isChild) flushMounts();
  }

  /** Apply the Component referenced by a VNode to the DOM.
   *	@param {Element} dom	The DOM node to mutate
   *	@param {VNode} vnode	A Component-referencing VNode
   *	@returns {Element} dom	The created/mutated element
   *	@private
   */

  function buildComponentFromVNode(dom, vnode, context, mountAll) {
  	var c = dom && dom._component,
  	    oldDom = dom,
  	    isDirectOwner = c && dom._componentConstructor === vnode.nodeName,
  	    isOwner = isDirectOwner,
  	    props = getNodeProps(vnode);
  	while (c && !isOwner && (c = c._parentComponent)) {
  		isOwner = c.constructor === vnode.nodeName;
  	}

  	if (c && isOwner && (!mountAll || c._component)) {
  		setComponentProps(c, props, ASYNC_RENDER, context, mountAll);
  		dom = c.base;
  	} else {
  		if (c && !isDirectOwner) {
  			unmountComponent(c, true);
  			dom = oldDom = null;
  		}

  		c = createComponent(vnode.nodeName, props, context);
  		if (dom && !c.nextBase) {
  			c.nextBase = dom;
  			// passing dom/oldDom as nextBase will recycle it if unused, so bypass recycling on L241:
  			oldDom = null;
  		}
  		setComponentProps(c, props, SYNC_RENDER, context, mountAll);
  		dom = c.base;

  		if (oldDom && dom !== oldDom) {
  			oldDom._component = null;
  			recollectNodeTree(oldDom);
  		}
  	}

  	return dom;
  }

  /** Remove a component from the DOM and recycle it.
   *	@param {Element} dom			A DOM node from which to unmount the given Component
   *	@param {Component} component	The Component instance to unmount
   *	@private
   */

  function unmountComponent(component, remove) {
  	if (options.beforeUnmount) options.beforeUnmount(component);

  	// console.log(`${remove?'Removing':'Unmounting'} component: ${component.constructor.name}`);
  	var base = component.base;

  	component._disable = true;

  	if (component.componentWillUnmount) component.componentWillUnmount();

  	component.base = null;

  	// recursively tear down & recollect high-order component children:
  	var inner = component._component;
  	if (inner) {
  		unmountComponent(inner, remove);
  	} else if (base) {
  		if (base[ATTR_KEY] && base[ATTR_KEY].ref) base[ATTR_KEY].ref(null);

  		component.nextBase = base;

  		if (remove) {
  			removeNode(base);
  			collectComponent(component);
  		}
  		removeOrphanedChildren(base.childNodes, !remove);
  	}

  	if (component.__ref) component.__ref(null);
  	if (component.componentDidUnmount) component.componentDidUnmount();
  }

  /** Base Component class, for he ES6 Class method of creating Components
   *	@public
   *
   *	@example
   *	class MyFoo extends Component {
   *		render(props, state) {
   *			return <div />;
   *		}
   *	}
   */

  function Component(props, context) {
  	/** @private */
  	this._dirty = true;
  	// /** @public */
  	// this._disableRendering = false;
  	// /** @public */
  	// this.prevState = this.prevProps = this.prevContext = this.base = this.nextBase = this._parentComponent = this._component = this.__ref = this.__key = this._linkedStates = this._renderCallbacks = null;
  	/** @public */
  	this.context = context;
  	/** @type {object} */
  	this.props = props;
  	/** @type {object} */
  	if (!this.state) this.state = {};
  }

  extend(Component.prototype, {

  	/** Returns a `boolean` value indicating if the component should re-render when receiving the given `props` and `state`.
    *	@param {object} nextProps
    *	@param {object} nextState
    *	@param {object} nextContext
    *	@returns {Boolean} should the component re-render
    *	@name shouldComponentUpdate
    *	@function
    */
  	// shouldComponentUpdate() {
  	// 	return true;
  	// },

  	/** Returns a function that sets a state property when called.
    *	Calling linkState() repeatedly with the same arguments returns a cached link function.
    *
    *	Provides some built-in special cases:
    *		- Checkboxes and radio buttons link their boolean `checked` value
    *		- Inputs automatically link their `value` property
    *		- Event paths fall back to any associated Component if not found on an element
    *		- If linked value is a function, will invoke it and use the result
    *
    *	@param {string} key				The path to set - can be a dot-notated deep key
    *	@param {string} [eventPath]		If set, attempts to find the new state value at a given dot-notated path within the object passed to the linkedState setter.
    *	@returns {function} linkStateSetter(e)
    *
    *	@example Update a "text" state value when an input changes:
    *		<input onChange={ this.linkState('text') } />
    *
    *	@example Set a deep state value on click
    *		<button onClick={ this.linkState('touch.coords', 'touches.0') }>Tap</button
    */
  	linkState: function linkState(key, eventPath) {
  		var c = this._linkedStates || (this._linkedStates = {});
  		return c[key + eventPath] || (c[key + eventPath] = createLinkedState(this, key, eventPath));
  	},

  	/** Update component state by copying properties from `state` to `this.state`.
    *	@param {object} state		A hash of state properties to update with new values
    */
  	setState: function setState(state, callback) {
  		var s = this.state;
  		if (!this.prevState) this.prevState = clone(s);
  		extend(s, isFunction(state) ? state(s, this.props) : state);
  		if (callback) (this._renderCallbacks = this._renderCallbacks || []).push(callback);
  		enqueueRender(this);
  	},

  	/** Immediately perform a synchronous re-render of the component.
    *	@private
    */
  	forceUpdate: function forceUpdate() {
  		renderComponent(this, FORCE_RENDER);
  	},

  	/** Accepts `props` and `state`, and returns a new Virtual DOM tree to build.
    *	Virtual DOM is generally constructed via [JSX](http://jasonformat.com/wtf-is-jsx).
    *	@param {object} props		Props (eg: JSX attributes) received from parent element/component
    *	@param {object} state		The component's current state
    *	@param {object} context		Context object (if a parent component has provided context)
    *	@returns VNode
    */
  	render: function render() {}

  });

  /** Render JSX into a `parent` Element.
   *	@param {VNode} vnode		A (JSX) VNode to render
   *	@param {Element} parent		DOM element to render into
   *	@param {Element} [merge]	Attempt to re-use an existing DOM tree rooted at `merge`
   *	@public
   *
   *	@example
   *	// render a div into <body>:
   *	render(<div id="hello">hello!</div>, document.body);
   *
   *	@example
   *	// render a "Thing" component into #foo:
   *	const Thing = ({ name }) => <span>{ name }</span>;
   *	render(<Thing name="one" />, document.querySelector('#foo'));
   */

  function render(vnode, parent, merge) {
    return diff(merge, vnode, {}, false, parent);
  }

  exports.createElement = h;
  exports.h = h;
  exports.cloneElement = cloneElement;
  exports.Component = Component;
  exports.render = render;
  exports.rerender = rerender;
  exports.options = options;

  Object.defineProperty(exports, '__esModule', { value: true });

}));
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