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b1d2e4daf3
Add the Array.from polyfill for IE11. This is required to support the transpiled ES6 spread syntex generated by babel: https://babeljs.io/docs/en/caveats/
284 lines
8.2 KiB
JavaScript
284 lines
8.2 KiB
JavaScript
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/entries
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if (!Object.entries) {
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Object.entries = function(obj) {
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var ownProps = Object.keys(obj),
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i = ownProps.length,
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resArray = new Array(i); // preallocate the Array
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while (i--) resArray[i] = [ownProps[i], obj[ownProps[i]]];
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return resArray;
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};
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}
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// adapted from https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/entries
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// missing in ie only
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if (!Object.values) {
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Object.values = function(obj) {
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var ownProps = Object.keys(obj),
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i = ownProps.length,
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resArray = new Array(i); // preallocate the Array
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while (i--) resArray[i] = obj[ownProps[i]];
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return resArray;
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};
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}
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// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign
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if (typeof Object.assign !== "function") {
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// Must be writable: true, enumerable: false, configurable: true
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Object.defineProperty(Object, "assign", {
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value: function assign(target) {
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// .length of function is 2
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"use strict";
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if (target == null) {
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// TypeError if undefined or null
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throw new TypeError("Cannot convert undefined or null to object");
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}
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var to = Object(target);
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for (var index = 1; index < arguments.length; index++) {
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var nextSource = arguments[index];
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if (nextSource != null) {
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// Skip over if undefined or null
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for (var nextKey in nextSource) {
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// Avoid bugs when hasOwnProperty is shadowed
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if (Object.prototype.hasOwnProperty.call(nextSource, nextKey)) {
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to[nextKey] = nextSource[nextKey];
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}
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}
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}
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}
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return to;
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},
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writable: true,
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configurable: true
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});
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}
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// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/includes#Polyfill
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/* eslint-disable */
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if (!Array.prototype.includes) {
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Object.defineProperty(Array.prototype, "includes", {
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value: function(searchElement, fromIndex) {
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if (this == null) {
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throw new TypeError('"this" is null or not defined');
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}
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// 1. Let O be ? ToObject(this value).
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var o = Object(this);
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// 2. Let len be ? ToLength(? Get(O, "length")).
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var len = o.length >>> 0;
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// 3. If len is 0, return false.
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if (len === 0) {
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return false;
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}
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// 4. Let n be ? ToInteger(fromIndex).
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// (If fromIndex is undefined, this step produces the value 0.)
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var n = fromIndex | 0;
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// 5. If n ≥ 0, then
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// a. Let k be n.
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// 6. Else n < 0,
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// a. Let k be len + n.
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// b. If k < 0, let k be 0.
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var k = Math.max(n >= 0 ? n : len - Math.abs(n), 0);
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function sameValueZero(x, y) {
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return (
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x === y ||
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(typeof x === "number" &&
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typeof y === "number" &&
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isNaN(x) &&
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isNaN(y))
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);
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}
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// 7. Repeat, while k < len
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while (k < len) {
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// a. Let elementK be the result of ? Get(O, ! ToString(k)).
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// b. If SameValueZero(searchElement, elementK) is true, return true.
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if (sameValueZero(o[k], searchElement)) {
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return true;
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}
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// c. Increase k by 1.
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k++;
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}
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// 8. Return false
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return false;
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}
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});
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}
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// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/includes#Polyfill
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if (!String.prototype.includes) {
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Object.defineProperty(String.prototype, "includes", {
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value: function(search, start) {
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if (typeof start !== "number") {
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start = 0;
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}
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if (start + search.length > this.length) {
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return false;
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} else {
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return this.indexOf(search, start) !== -1;
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}
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}
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});
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}
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// https://tc39.github.io/ecma262/#sec-array.prototype.find
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if (!Array.prototype.find) {
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Object.defineProperty(Array.prototype, "find", {
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value: function(predicate) {
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// 1. Let O be ? ToObject(this value).
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if (this == null) {
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throw new TypeError('"this" is null or not defined');
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}
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var o = Object(this);
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// 2. Let len be ? ToLength(? Get(O, "length")).
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var len = o.length >>> 0;
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// 3. If IsCallable(predicate) is false, throw a TypeError exception.
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if (typeof predicate !== "function") {
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throw new TypeError("predicate must be a function");
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}
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// 4. If thisArg was supplied, let T be thisArg; else let T be undefined.
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var thisArg = arguments[1];
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// 5. Let k be 0.
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var k = 0;
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// 6. Repeat, while k < len
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while (k < len) {
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// a. Let Pk be ! ToString(k).
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// b. Let kValue be ? Get(O, Pk).
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// c. Let testResult be ToBoolean(? Call(predicate, T, « kValue, k, O »)).
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// d. If testResult is true, return kValue.
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var kValue = o[k];
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if (predicate.call(thisArg, kValue, k, o)) {
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return kValue;
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}
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// e. Increase k by 1.
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k++;
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}
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// 7. Return undefined.
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return undefined;
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},
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configurable: true,
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writable: true
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});
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}
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// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/flags#Polyfill
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if (RegExp.prototype.flags === undefined) {
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Object.defineProperty(RegExp.prototype, "flags", {
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configurable: true,
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get: function() {
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return this.toString().match(/[gimsuy]*$/)[0];
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}
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});
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}
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// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/from
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// Production steps of ECMA-262, Edition 6, 22.1.2.1
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if (!Array.from) {
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Array.from = (function() {
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var toStr = Object.prototype.toString;
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var isCallable = function(fn) {
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return typeof fn === "function" || toStr.call(fn) === "[object Function]";
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};
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var toInteger = function(value) {
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var number = Number(value);
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if (isNaN(number)) {
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return 0;
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}
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if (number === 0 || !isFinite(number)) {
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return number;
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}
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return (number > 0 ? 1 : -1) * Math.floor(Math.abs(number));
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};
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var maxSafeInteger = Math.pow(2, 53) - 1;
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var toLength = function(value) {
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var len = toInteger(value);
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return Math.min(Math.max(len, 0), maxSafeInteger);
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};
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// The length property of the from method is 1.
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return function from(arrayLike /*, mapFn, thisArg */) {
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// 1. Let C be the this value.
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var C = this;
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// 2. Let items be ToObject(arrayLike).
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var items = Object(arrayLike);
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// 3. ReturnIfAbrupt(items).
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if (arrayLike == null) {
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throw new TypeError(
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"Array.from requires an array-like object - not null or undefined"
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);
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}
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// 4. If mapfn is undefined, then let mapping be false.
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var mapFn = arguments.length > 1 ? arguments[1] : void undefined;
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var T;
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if (typeof mapFn !== "undefined") {
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// 5. else
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// 5. a If IsCallable(mapfn) is false, throw a TypeError exception.
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if (!isCallable(mapFn)) {
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throw new TypeError(
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"Array.from: when provided, the second argument must be a function"
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);
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}
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// 5. b. If thisArg was supplied, let T be thisArg; else let T be undefined.
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if (arguments.length > 2) {
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T = arguments[2];
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}
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}
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// 10. Let lenValue be Get(items, "length").
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// 11. Let len be ToLength(lenValue).
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var len = toLength(items.length);
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// 13. If IsConstructor(C) is true, then
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// 13. a. Let A be the result of calling the [[Construct]] internal method
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// of C with an argument list containing the single item len.
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// 14. a. Else, Let A be ArrayCreate(len).
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var A = isCallable(C) ? Object(new C(len)) : new Array(len);
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// 16. Let k be 0.
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var k = 0;
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// 17. Repeat, while k < len… (also steps a - h)
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var kValue;
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while (k < len) {
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kValue = items[k];
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if (mapFn) {
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A[k] =
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typeof T === "undefined"
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? mapFn(kValue, k)
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: mapFn.call(T, kValue, k);
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} else {
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A[k] = kValue;
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}
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k += 1;
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}
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// 18. Let putStatus be Put(A, "length", len, true).
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A.length = len;
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// 20. Return A.
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return A;
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};
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})();
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}
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/* eslint-enable */
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