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\"minArgs\": 0,\n \"maxArgs\": 1\n },\n \"remove\": {\n \"minArgs\": 1,\n \"maxArgs\": 1\n },\n \"set\": {\n \"minArgs\": 1,\n \"maxArgs\": 1\n }\n }\n },\n \"tabs\": {\n \"create\": {\n \"minArgs\": 1,\n \"maxArgs\": 1\n },\n \"captureVisibleTab\": {\n \"minArgs\": 0,\n \"maxArgs\": 2\n },\n \"detectLanguage\": {\n \"minArgs\": 0,\n \"maxArgs\": 1\n },\n \"duplicate\": {\n \"minArgs\": 1,\n \"maxArgs\": 1\n },\n \"executeScript\": {\n \"minArgs\": 1,\n \"maxArgs\": 2\n },\n \"get\": {\n \"minArgs\": 1,\n \"maxArgs\": 1\n },\n \"getCurrent\": {\n \"minArgs\": 0,\n \"maxArgs\": 0\n },\n \"getZoom\": {\n \"minArgs\": 0,\n \"maxArgs\": 1\n },\n \"getZoomSettings\": {\n \"minArgs\": 0,\n \"maxArgs\": 1\n },\n \"highlight\": {\n \"minArgs\": 1,\n \"maxArgs\": 1\n },\n \"insertCSS\": {\n \"minArgs\": 1,\n \"maxArgs\": 2\n },\n \"move\": {\n \"minArgs\": 2,\n \"maxArgs\": 2\n },\n \"reload\": {\n \"minArgs\": 0,\n \"maxArgs\": 2\n },\n \"remove\": {\n \"minArgs\": 1,\n \"maxArgs\": 1\n },\n \"query\": {\n \"minArgs\": 1,\n \"maxArgs\": 1\n },\n \"removeCSS\": {\n \"minArgs\": 1,\n \"maxArgs\": 2\n },\n \"sendMessage\": {\n \"minArgs\": 2,\n \"maxArgs\": 3\n },\n \"setZoom\": {\n \"minArgs\": 1,\n \"maxArgs\": 2\n },\n \"setZoomSettings\": {\n \"minArgs\": 1,\n \"maxArgs\": 2\n },\n \"update\": {\n \"minArgs\": 1,\n \"maxArgs\": 2\n }\n },\n \"webNavigation\": {\n \"getAllFrames\": {\n \"minArgs\": 1,\n \"maxArgs\": 1\n },\n \"getFrame\": {\n \"minArgs\": 1,\n \"maxArgs\": 1\n }\n },\n \"webRequest\": {\n \"handlerBehaviorChanged\": {\n \"minArgs\": 0,\n \"maxArgs\": 0\n }\n },\n \"windows\": {\n \"create\": {\n \"minArgs\": 0,\n \"maxArgs\": 1\n },\n \"get\": {\n \"minArgs\": 1,\n \"maxArgs\": 2\n },\n \"getAll\": {\n \"minArgs\": 0,\n \"maxArgs\": 1\n },\n \"getCurrent\": {\n \"minArgs\": 0,\n \"maxArgs\": 1\n },\n \"getLastFocused\": {\n \"minArgs\": 0,\n \"maxArgs\": 1\n },\n \"remove\": {\n \"minArgs\": 1,\n \"maxArgs\": 1\n },\n \"update\": {\n \"minArgs\": 2,\n \"maxArgs\": 2\n }\n }\n };\n\n if (Object.keys(apiMetadata).length === 0) {\n throw new Error(\"api-metadata.json has not been included in browser-polyfill\");\n }\n\n /**\n * A WeakMap subclass which creates and stores a value for any key which does\n * not exist when accessed, but behaves exactly as an ordinary WeakMap\n * otherwise.\n *\n * @param {function} createItem\n * A function which will be called in order to create the value for any\n * key which does not exist, the first time it is accessed. The\n * function receives, as its only argument, the key being created.\n */\n class DefaultWeakMap extends WeakMap {\n constructor(createItem, items = undefined) {\n super(items);\n this.createItem = createItem;\n }\n\n get(key) {\n if (!this.has(key)) {\n this.set(key, this.createItem(key));\n }\n\n return super.get(key);\n }\n }\n\n /**\n * Returns true if the given object is an object with a `then` method, and can\n * therefore be assumed to behave as a Promise.\n *\n * @param {*} value The value to test.\n * @returns {boolean} True if the value is thenable.\n */\n const isThenable = value => {\n return value && typeof value === \"object\" && typeof value.then === \"function\";\n };\n\n /**\n * Creates and returns a function which, when called, will resolve or reject\n * the given promise based on how it is called:\n *\n * - If, when called, `chrome.runtime.lastError` contains a non-null object,\n * the promise is rejected with that value.\n * - If the function is called with exactly one argument, the promise is\n * resolved to that value.\n * - Otherwise, the promise is resolved to an array containing all of the\n * function's arguments.\n *\n * @param {object} promise\n * An object containing the resolution and rejection functions of a\n * promise.\n * @param {function} promise.resolve\n * The promise's resolution function.\n * @param {function} promise.rejection\n * The promise's rejection function.\n * @param {object} metadata\n * Metadata about the wrapped method which has created the callback.\n * @param {integer} metadata.maxResolvedArgs\n * The maximum number of arguments which may be passed to the\n * callback created by the wrapped async function.\n *\n * @returns {function}\n * The generated callback function.\n */\n const makeCallback = (promise, metadata) => {\n return (...callbackArgs) => {\n if (chrome.runtime.lastError) {\n promise.reject(chrome.runtime.lastError);\n } else if (metadata.singleCallbackArg || callbackArgs.length === 1) {\n promise.resolve(callbackArgs[0]);\n } else {\n promise.resolve(callbackArgs);\n }\n };\n };\n\n /**\n * Creates a wrapper function for a method with the given name and metadata.\n *\n * @param {string} name\n * The name of the method which is being wrapped.\n * @param {object} metadata\n * Metadata about the method being wrapped.\n * @param {integer} metadata.minArgs\n * The minimum number of arguments which must be passed to the\n * function. If called with fewer than this number of arguments, the\n * wrapper will raise an exception.\n * @param {integer} metadata.maxArgs\n * The maximum number of arguments which may be passed to the\n * function. If called with more than this number of arguments, the\n * wrapper will raise an exception.\n * @param {integer} metadata.maxResolvedArgs\n * The maximum number of arguments which may be passed to the\n * callback created by the wrapped async function.\n *\n * @returns {function(object, ...*)}\n * The generated wrapper function.\n */\n const wrapAsyncFunction = (name, metadata) => {\n const pluralizeArguments = (numArgs) => numArgs == 1 ? \"argument\" : \"arguments\";\n\n return function asyncFunctionWrapper(target, ...args) {\n if (args.length < metadata.minArgs) {\n throw new Error(`Expected at least ${metadata.minArgs} ${pluralizeArguments(metadata.minArgs)} for ${name}(), got ${args.length}`);\n }\n\n if (args.length > metadata.maxArgs) {\n throw new Error(`Expected at most ${metadata.maxArgs} ${pluralizeArguments(metadata.maxArgs)} for ${name}(), got ${args.length}`);\n }\n\n return new Promise((resolve, reject) => {\n target[name](...args, makeCallback({resolve, reject}, metadata));\n });\n };\n };\n\n /**\n * Wraps an existing method of the target object, so that calls to it are\n * intercepted by the given wrapper function. The wrapper function receives,\n * as its first argument, the original `target` object, followed by each of\n * the arguments passed to the orginal method.\n *\n * @param {object} target\n * The original target object that the wrapped method belongs to.\n * @param {function} method\n * The method being wrapped. This is used as the target of the Proxy\n * object which is created to wrap the method.\n * @param {function} wrapper\n * The wrapper function which is called in place of a direct invocation\n * of the wrapped method.\n *\n * @returns {Proxy<function>}\n * A Proxy object for the given method, which invokes the given wrapper\n * method in its place.\n */\n const wrapMethod = (target, method, wrapper) => {\n return new Proxy(method, {\n apply(targetMethod, thisObj, args) {\n return wrapper.call(thisObj, target, ...args);\n },\n });\n };\n\n let hasOwnProperty = Function.call.bind(Object.prototype.hasOwnProperty);\n\n /**\n * Wraps an object in a Proxy which intercepts and wraps certain methods\n * based on the given `wrappers` and `metadata` objects.\n *\n * @param {object} target\n * The target object to wrap.\n *\n * @param {object} [wrappers = {}]\n * An object tree containing wrapper functions for special cases. Any\n * function present in this object tree is called in place of the\n * method in the same location in the `target` object tree. These\n * wrapper methods are invoked as described in {@see wrapMethod}.\n *\n * @param {object} [metadata = {}]\n * An object tree containing metadata used to automatically generate\n * Promise-based wrapper functions for asynchronous. Any function in\n * the `target` object tree which has a corresponding metadata object\n * in the same location in the `metadata` tree is replaced with an\n * automatically-generated wrapper function, as described in\n * {@see wrapAsyncFunction}\n *\n * @returns {Proxy<object>}\n */\n const wrapObject = (target, wrappers = {}, metadata = {}) => {\n let cache = Object.create(null);\n\n let handlers = {\n has(target, prop) {\n return prop in target || prop in cache;\n },\n\n get(target, prop, receiver) {\n if (prop in cache) {\n return cache[prop];\n }\n\n if (!(prop in target)) {\n return undefined;\n }\n\n let value = target[prop];\n\n if (typeof value === \"function\") {\n // This is a method on the underlying object. Check if we need to do\n // any wrapping.\n\n if (typeof wrappers[prop] === \"function\") {\n // We have a special-case wrapper for this method.\n value = wrapMethod(target, target[prop], wrappers[prop]);\n } else if (hasOwnProperty(metadata, prop)) {\n // This is an async method that we have metadata for. Create a\n // Promise wrapper for it.\n let wrapper = wrapAsyncFunction(prop, metadata[prop]);\n value = wrapMethod(target, target[prop], wrapper);\n } else {\n // This is a method that we don't know or care about. Return the\n // original method, bound to the underlying object.\n value = value.bind(target);\n }\n } else if (typeof value === \"object\" && value !== null &&\n (hasOwnProperty(wrappers, prop) ||\n hasOwnProperty(metadata, prop))) {\n // This is an object that we need to do some wrapping for the children\n // of. Create a sub-object wrapper for it with the appropriate child\n // metadata.\n value = wrapObject(value, wrappers[prop], metadata[prop]);\n } else {\n // We don't need to do any wrapping for this property,\n // so just forward all access to the underlying object.\n Object.defineProperty(cache, prop, {\n configurable: true,\n enumerable: true,\n get() {\n return target[prop];\n },\n set(value) {\n target[prop] = value;\n },\n });\n\n return value;\n }\n\n cache[prop] = value;\n return value;\n },\n\n set(target, prop, value, receiver) {\n if (prop in cache) {\n cache[prop] = value;\n } else {\n target[prop] = value;\n }\n return true;\n },\n\n defineProperty(target, prop, desc) {\n return Reflect.defineProperty(cache, prop, desc);\n },\n\n deleteProperty(target, prop) {\n return Reflect.deleteProperty(cache, prop);\n },\n };\n\n return new Proxy(target, handlers);\n };\n\n /**\n * Creates a set of wrapper functions for an event object, which handles\n * wrapping of listener functions that those messages are passed.\n *\n * A single wrapper is created for each listener function, and stored in a\n * map. Subsequent calls to `addListener`, `hasListener`, or `removeListener`\n * retrieve the original wrapper, so that attempts to remove a\n * previously-added listener work as expected.\n *\n * @param {DefaultWeakMap<function, function>} wrapperMap\n * A DefaultWeakMap object which will create the appropriate wrapper\n * for a given listener function when one does not exist, and retrieve\n * an existing one when it does.\n *\n * @returns {object}\n */\n const wrapEvent = wrapperMap => ({\n addListener(target, listener, ...args) {\n target.addListener(wrapperMap.get(listener), ...args);\n },\n\n hasListener(target, listener) {\n return target.hasListener(wrapperMap.get(listener));\n },\n\n removeListener(target, listener) {\n target.removeListener(wrapperMap.get(listener));\n },\n });\n\n const onMessageWrappers = new DefaultWeakMap(listener => {\n if (typeof listener !== \"function\") {\n return listener;\n }\n\n /**\n * Wraps a message listener function so that it may send responses based on\n * its return value, rather than by returning a sentinel value and calling a\n * callback. If the listener function returns a Promise, the response is\n * sent when the promise either resolves or rejects.\n *\n * @param {*} message\n * The message sent by the other end of the channel.\n * @param {object} sender\n * Details about the sender of the message.\n * @param {function(*)} sendResponse\n * A callback which, when called with an arbitrary argument, sends\n * that value as a response.\n * @returns {boolean}\n * True if the wrapped listener returned a Promise, which will later\n * yield a response. False otherwise.\n */\n return function onMessage(message, sender, sendResponse) {\n let result = listener(message, sender);\n\n if (isThenable(result)) {\n result.then(sendResponse, error => {\n console.error(error);\n sendResponse(error);\n });\n\n return true;\n } else if (result !== undefined) {\n sendResponse(result);\n }\n };\n });\n\n const staticWrappers = {\n runtime: {\n onMessage: wrapEvent(onMessageWrappers),\n },\n };\n\n // Create a new empty object and copy the properties of the original chrome object\n // to prevent a Proxy violation exception for the devtools API getter\n // (which is a read-only non-configurable property on the original target).\n const targetObject = Object.assign({}, chrome);\n\n return wrapObject(targetObject, staticWrappers, apiMetadata);\n };\n\n // The build process adds a UMD wrapper around this file, which makes the\n // `module` variable available.\n module.exports = wrapAPIs(); // eslint-disable-line no-undef\n} else {\n module.exports = browser; // eslint-disable-line no-undef\n}\n"]} |