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FIX: Include Symbol polyfill for IE11
This is necessary when we use `for (x of y)` operators in Javascript as they are transpiled to use `Symbol` which is not present in IE.
This commit is contained in:
Robin Ward
parent
db7d00a8dc
commit
c91a360ef7
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@ -357,4 +357,642 @@ if (!String.prototype.repeat) {
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};
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}
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/*!
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* Symbol-ES6 v0.1.2
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* ES6 Symbol polyfill in pure ES5.
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*
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* @license Copyright (c) 2017-2018 Rousan Ali, MIT License
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*
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* Codebase: https://github.com/rousan/symbol-es6
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* Date: 28th Jan, 2018
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*/
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(function(global, factory) {
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"use strict";
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if (typeof module === "object" && typeof module.exports === "object") {
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// For the environment like NodeJS, CommonJS etc where module or
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// module.exports objects are available
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module.exports = factory(global);
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} else {
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// For browser context, where global object is window
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factory(global);
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}
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/* window is for browser environment and global is for NodeJS environment */
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})(typeof window !== "undefined" ? window : global, function(global) {
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"use strict";
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var defineProperty = Object.defineProperty;
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var defineProperties = Object.defineProperties;
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var symbolHiddenCounter = 0;
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var globalSymbolRegistry = [];
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var slice = Array.prototype.slice;
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var ES6 = typeof global.ES6 === "object" ? global.ES6 : (global.ES6 = {});
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var isArray = Array.isArray;
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var objectToString = Object.prototype.toString;
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var push = Array.prototype.push;
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var emptyFunction = function() {};
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var simpleFunction = function(arg) {
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return arg;
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};
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var isCallable = function(fn) {
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return typeof fn === "function";
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};
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var isConstructor = function(fn) {
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return isCallable(fn);
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};
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var Iterator = function() {};
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var ArrayIterator = function ArrayIterator(array, flag) {
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this._array = array;
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this._flag = flag;
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this._nextIndex = 0;
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};
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var StringIterator = function StringIterator(string, flag) {
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this._string = string;
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this._flag = flag;
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this._nextIndex = 0;
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};
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var isES6Running = function() {
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return false; /* Now 'false' for testing purpose */
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};
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var isObject = function(value) {
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return (
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value !== null &&
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(typeof value === "object" || typeof value === "function")
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);
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};
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var es6FunctionPrototypeHasInstanceSymbol = function(instance) {
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if (typeof this !== "function") return false;
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return instance instanceof this;
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};
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var es6InstanceOfOperator = function(object, constructor) {
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if (!isObject(constructor))
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throw new TypeError("Right-hand side of 'instanceof' is not an object");
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var hasInstanceSymbolProp = constructor[Symbol.hasInstance];
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if (typeof hasInstanceSymbolProp === "undefined") {
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return object instanceof constructor;
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} else if (typeof hasInstanceSymbolProp !== "function") {
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throw new TypeError(typeof hasInstanceSymbolProp + " is not a function");
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} else {
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return hasInstanceSymbolProp.call(constructor, object);
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}
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};
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// Generates name for a symbol instance and this name will be used as
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// property key for property symbols internally.
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var generateSymbolName = function(id) {
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return "@@_____" + id + "_____";
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};
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// Generates id for next Symbol instance
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var getNextSymbolId = function() {
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return symbolHiddenCounter++;
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};
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var setupSymbolInternals = function(symbol, desc) {
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defineProperties(symbol, {
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_description: {
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value: desc
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},
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_isSymbol: {
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value: true
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},
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_id: {
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value: getNextSymbolId()
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}
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});
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return symbol;
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};
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var checkSymbolInternals = function(symbol) {
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return (
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symbol._isSymbol === true &&
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typeof symbol._id === "number" &&
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typeof symbol._description === "string"
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);
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};
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var isSymbol = function(symbol) {
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return symbol instanceof Symbol && checkSymbolInternals(symbol);
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};
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var symbolFor = function(key) {
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key = String(key);
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var registryLength = globalSymbolRegistry.length,
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record,
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i = 0;
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for (; i < registryLength; ++i) {
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record = globalSymbolRegistry[i];
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if (record.key === key) return record.symbol;
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}
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record = {
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key: key,
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symbol: Symbol(key)
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};
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globalSymbolRegistry.push(record);
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return record.symbol;
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};
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var symbolKeyFor = function(symbol) {
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if (!ES6.isSymbol(symbol))
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throw new TypeError(String(symbol) + " is not a symbol");
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var registryLength = globalSymbolRegistry.length,
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record,
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i = 0;
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for (; i < registryLength; ++i) {
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record = globalSymbolRegistry[i];
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if (record.symbol === symbol) return record.key;
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}
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};
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/* It affects array1 and appends array2 at the end of array1 */
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var appendArray = function(array1, array2) {
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// Returns immediately if these are not array or not array-like objects
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if (
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!(
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typeof array1.length === "number" &&
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array1.length >= 0 &&
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typeof array2.length === "number" &&
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array2.length >= 0
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)
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)
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return;
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var length1 = Math.floor(array1.length),
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length2 = Math.floor(array2.length),
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i = 0;
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array1.length = length1 + length2;
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for (; i < length2; ++i)
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if (array2.hasOwnProperty(i)) array1[length1 + i] = array2[i];
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};
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var es6ObjectPrototypeToString = function toString() {
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if (this === undefined || this === null) return objectToString.call(this);
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// Add support for @@toStringTag symbol
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if (typeof this[Symbol.toStringTag] === "string")
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return "[object " + this[Symbol.toStringTag] + "]";
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else return objectToString.call(this);
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};
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var es6ArrayPrototypeConcat = function concat() {
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if (this === undefined || this === null)
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throw new TypeError("Array.prototype.concat called on null or undefined");
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// Boxing 'this' value to wrapper object
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var self = Object(this),
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targets = slice.call(arguments),
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outputs = []; // Later it may affected by Symbol
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targets.unshift(self);
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targets.forEach(function(target) {
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// If target is primitive then just push
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if (!isObject(target)) outputs.push(target);
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// Here Symbol.isConcatSpreadable support is added
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else if (typeof target[Symbol.isConcatSpreadable] !== "undefined") {
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if (target[Symbol.isConcatSpreadable]) {
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appendArray(outputs, target);
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} else {
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outputs.push(target);
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}
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} else if (isArray(target)) {
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appendArray(outputs, target);
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} else {
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outputs.push(target);
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}
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});
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return outputs;
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};
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var es6ForOfLoop = function(iterable, callback, thisArg) {
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callback = typeof callback !== "function" ? emptyFunction : callback;
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if (typeof iterable[Symbol.iterator] !== "function")
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throw new TypeError("Iterable[Symbol.iterator] is not a function");
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var iterator = iterable[Symbol.iterator](),
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iterationResult;
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if (typeof iterator.next !== "function")
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throw new TypeError(".iterator.next is not a function");
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while (true) {
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iterationResult = iterator.next();
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if (!isObject(iterationResult))
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throw new TypeError(
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"Iterator result " + iterationResult + " is not an object"
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);
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if (iterationResult.done) break;
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callback.call(thisArg, iterationResult.value);
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}
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};
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// Provides simple inheritance functionality
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var simpleInheritance = function(child, parent) {
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if (typeof child !== "function" || typeof parent !== "function")
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throw new TypeError("Child and Parent must be function type");
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child.prototype = Object.create(parent.prototype);
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child.prototype.constructor = child;
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};
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// Behaves as Symbol function in ES6, take description and returns an unique object,
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// but in ES6 this function returns 'symbol' primitive typed value.
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// Its type is 'object' not 'symbol'.
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// There is no wrapping in this case i.e. Object(sym) = sym.
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var Symbol = function Symbol(desc) {
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desc = typeof desc === "undefined" ? "" : String(desc);
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if (this instanceof Symbol)
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throw new TypeError("Symbol is not a constructor");
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return setupSymbolInternals(Object.create(Symbol.prototype), desc);
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};
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defineProperties(Symbol, {
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for: {
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value: symbolFor,
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writable: true,
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configurable: true
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},
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keyFor: {
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value: symbolKeyFor,
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writable: true,
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configurable: true
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},
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hasInstance: {
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value: Symbol("Symbol.hasInstance")
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},
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isConcatSpreadable: {
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value: Symbol("Symbol.isConcatSpreadable")
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},
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iterator: {
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value: Symbol("Symbol.iterator")
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},
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toStringTag: {
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value: Symbol("Symbol.toStringTag")
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}
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});
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// In ES6, this function returns like 'Symbol(<desc>)', but in this case
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// this function returns the symbol's internal name to work properly.
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Symbol.prototype.toString = function() {
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return generateSymbolName(this._id);
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};
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// Returns itself but in ES6 It returns 'symbol' typed value.
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Symbol.prototype.valueOf = function() {
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return this;
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};
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// Make Iterator like iterable
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defineProperty(Iterator.prototype, Symbol.iterator.toString(), {
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value: function() {
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return this;
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},
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writable: true,
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configurable: true
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});
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simpleInheritance(ArrayIterator, Iterator);
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simpleInheritance(StringIterator, Iterator);
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defineProperty(ArrayIterator.prototype, Symbol.toStringTag.toString(), {
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value: "Array Iterator",
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configurable: true
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});
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defineProperty(StringIterator.prototype, Symbol.toStringTag.toString(), {
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value: "String Iterator",
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configurable: true
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});
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// This iterator works on any Array or TypedArray or array-like objects
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ArrayIterator.prototype.next = function next() {
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if (!(this instanceof ArrayIterator))
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throw new TypeError(
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"Method Array Iterator.prototype.next called on incompatible receiver " +
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String(this)
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);
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var self = this,
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nextValue;
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if (self._nextIndex === -1) {
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return {
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done: true,
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value: undefined
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};
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}
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if (!(typeof self._array.length === "number" && self._array.length >= 0)) {
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self._nextIndex = -1;
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return {
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done: true,
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value: undefined
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};
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}
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// _flag = 1 for [index, value]
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// _flag = 2 for [value]
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// _flag = 3 for [index]
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if (self._nextIndex < Math.floor(self._array.length)) {
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if (self._flag === 1)
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nextValue = [self._nextIndex, self._array[self._nextIndex]];
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else if (self._flag === 2) nextValue = self._array[self._nextIndex];
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else if (self._flag === 3) nextValue = self._nextIndex;
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self._nextIndex++;
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return {
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done: false,
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value: nextValue
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};
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} else {
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self._nextIndex = -1;
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return {
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done: true,
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value: undefined
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};
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}
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};
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StringIterator.prototype.next = function next() {
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if (!(this instanceof StringIterator))
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throw new TypeError(
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"Method String Iterator.prototype.next called on incompatible receiver " +
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String(this)
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);
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var self = this,
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stringObject = new String(this._string),
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nextValue;
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if (self._nextIndex === -1) {
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return {
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done: true,
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value: undefined
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};
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}
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if (self._nextIndex < stringObject.length) {
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nextValue = stringObject[self._nextIndex];
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self._nextIndex++;
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return {
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done: false,
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value: nextValue
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};
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} else {
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self._nextIndex = -1;
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return {
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done: true,
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value: undefined
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};
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}
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};
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var es6ArrayPrototypeIteratorSymbol = function values() {
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if (this === undefined || this === null)
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throw new TypeError("Cannot convert undefined or null to object");
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var self = Object(this);
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return new ArrayIterator(self, 2);
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};
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var es6StringPrototypeIteratorSymbol = function values() {
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if (this === undefined || this === null)
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throw new TypeError(
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"String.prototype[Symbol.iterator] called on null or undefined"
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);
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return new StringIterator(String(this), 0);
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};
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var es6ArrayPrototypeEntries = function entries() {
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if (this === undefined || this === null)
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throw new TypeError("Cannot convert undefined or null to object");
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var self = Object(this);
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return new ArrayIterator(self, 1);
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};
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var es6ArrayPrototypeKeys = function keys() {
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if (this === undefined || this === null)
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throw new TypeError("Cannot convert undefined or null to object");
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var self = Object(this);
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return new ArrayIterator(self, 3);
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};
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var SpreadOperatorImpl = function(target, thisArg) {
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this._target = target;
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this._values = [];
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this._thisArg = thisArg;
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};
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// All the arguments must be iterable
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SpreadOperatorImpl.prototype.spread = function() {
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var self = this;
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slice.call(arguments).forEach(function(iterable) {
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ES6.forOf(iterable, function(value) {
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self._values.push(value);
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});
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});
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return self;
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};
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SpreadOperatorImpl.prototype.add = function() {
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var self = this;
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slice.call(arguments).forEach(function(value) {
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self._values.push(value);
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});
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return self;
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};
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SpreadOperatorImpl.prototype.call = function(thisArg) {
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if (typeof this._target !== "function")
|
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throw new TypeError("Target is not a function");
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thisArg = arguments.length <= 0 ? this._thisArg : thisArg;
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return this._target.apply(thisArg, this._values);
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};
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SpreadOperatorImpl.prototype.new = function() {
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if (typeof this._target !== "function")
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throw new TypeError("Target is not a constructor");
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var temp, returnValue;
|
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temp = Object.create(this._target.prototype);
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returnValue = this._target.apply(temp, this._values);
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return isObject(returnValue) ? returnValue : temp;
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};
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// Affects the target array
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SpreadOperatorImpl.prototype.array = function() {
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if (!isArray(this._target)) throw new TypeError("Target is not a array");
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push.apply(this._target, this._values);
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return this._target;
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};
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// Target must be Array or function
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var es6SpreadOperator = function spreadOperator(target, thisArg) {
|
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if (!(typeof target === "function" || isArray(target)))
|
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throw new TypeError(
|
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"Spread operator only supports on array and function objects at this moment"
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);
|
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return new SpreadOperatorImpl(target, thisArg);
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};
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var es6ArrayFrom = function from(arrayLike, mapFn, thisArg) {
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var constructor,
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i = 0,
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length,
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outputs;
|
||||
// Use the generic constructor
|
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constructor = !isConstructor(this) ? Array : this;
|
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if (arrayLike === undefined || arrayLike === null)
|
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throw new TypeError("Cannot convert undefined or null to object");
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|
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arrayLike = Object(arrayLike);
|
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if (mapFn === undefined) mapFn = simpleFunction;
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else if (!isCallable(mapFn))
|
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throw new TypeError(mapFn + " is not a function");
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|
||||
if (typeof arrayLike[Symbol.iterator] === "undefined") {
|
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if (!(typeof arrayLike.length === "number" && arrayLike.length >= 0)) {
|
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outputs = new constructor(0);
|
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outputs.length = 0;
|
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return outputs;
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}
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length = Math.floor(arrayLike.length);
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outputs = new constructor(length);
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outputs.length = length;
|
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for (; i < length; ++i) outputs[i] = mapFn.call(thisArg, arrayLike[i]);
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||||
} else {
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outputs = new constructor();
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outputs.length = 0;
|
||||
ES6.forOf(arrayLike, function(value) {
|
||||
outputs.length++;
|
||||
outputs[outputs.length - 1] = mapFn.call(thisArg, value);
|
||||
});
|
||||
}
|
||||
return outputs;
|
||||
};
|
||||
|
||||
// Export ES6 APIs and add all the patches to support Symbol in ES5
|
||||
// If the running environment already supports ES6 then no patches will be applied,
|
||||
if (isES6Running()) return ES6;
|
||||
else {
|
||||
// Some ES6 APIs can't be implemented in pure ES5, so this 'ES6' object provides
|
||||
// some equivalent functionality of these features.
|
||||
defineProperties(ES6, {
|
||||
// Checks if a JS value is a symbol
|
||||
// It can be used as equivalent api in ES6: typeof symbol === 'symbol'
|
||||
isSymbol: {
|
||||
value: isSymbol,
|
||||
writable: true,
|
||||
configurable: true
|
||||
},
|
||||
|
||||
// Native ES5 'instanceof' operator does not support @@hasInstance symbol,
|
||||
// this method provides same functionality of ES6 'instanceof' operator.
|
||||
instanceOf: {
|
||||
value: es6InstanceOfOperator,
|
||||
writable: true,
|
||||
configurable: true
|
||||
},
|
||||
|
||||
// This method behaves exactly same as ES6 for...of loop.
|
||||
forOf: {
|
||||
value: es6ForOfLoop,
|
||||
writable: true,
|
||||
configurable: true
|
||||
},
|
||||
|
||||
// This method gives same functionality of the spread operator of ES6
|
||||
// It works on only functions and arrays.
|
||||
// Limitation: You can't create array like this [...iterable, , , , 33] by this method,
|
||||
// to achieve this you have to do like this [...iterable, undefined, undefined, undefined, 33]
|
||||
spreadOperator: {
|
||||
value: es6SpreadOperator,
|
||||
writable: true,
|
||||
configurable: true
|
||||
}
|
||||
});
|
||||
|
||||
defineProperty(global, "Symbol", {
|
||||
value: Symbol,
|
||||
writable: true,
|
||||
configurable: true
|
||||
});
|
||||
|
||||
defineProperty(Function.prototype, Symbol.hasInstance.toString(), {
|
||||
value: es6FunctionPrototypeHasInstanceSymbol
|
||||
});
|
||||
|
||||
defineProperty(Array.prototype, "concat", {
|
||||
value: es6ArrayPrototypeConcat,
|
||||
writable: true,
|
||||
configurable: true
|
||||
});
|
||||
|
||||
defineProperty(Object.prototype, "toString", {
|
||||
value: es6ObjectPrototypeToString,
|
||||
writable: true,
|
||||
configurable: true
|
||||
});
|
||||
|
||||
defineProperty(Array.prototype, Symbol.iterator.toString(), {
|
||||
value: es6ArrayPrototypeIteratorSymbol,
|
||||
writable: true,
|
||||
configurable: true
|
||||
});
|
||||
|
||||
defineProperty(Array, "from", {
|
||||
value: es6ArrayFrom,
|
||||
writable: true,
|
||||
configurable: true
|
||||
});
|
||||
|
||||
defineProperty(Array.prototype, "entries", {
|
||||
value: es6ArrayPrototypeEntries,
|
||||
writable: true,
|
||||
configurable: true
|
||||
});
|
||||
|
||||
defineProperty(Array.prototype, "keys", {
|
||||
value: es6ArrayPrototypeKeys,
|
||||
writable: true,
|
||||
configurable: true
|
||||
});
|
||||
|
||||
defineProperty(String.prototype, Symbol.iterator.toString(), {
|
||||
value: es6StringPrototypeIteratorSymbol,
|
||||
writable: true,
|
||||
configurable: true
|
||||
});
|
||||
}
|
||||
|
||||
return ES6;
|
||||
});
|
||||
/* eslint-enable */
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user