Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
[react-packager] Add Array.prototype.es6 polyfill
- Loading branch information
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,106 @@ | ||
| /** | ||
| * Copyright 2004-present Facebook. All Rights Reserved. | ||
| * | ||
| * @provides Array.prototype.es6 | ||
| * @polyfill | ||
| * @requires __DEV__ | ||
| */ | ||
|
|
||
| /*eslint-disable */ | ||
| /*jslint bitwise: true */ | ||
|
|
||
| (function (undefined) { | ||
| if (__DEV__) { | ||
| // Define DEV-only setter that blows up when someone incorrectly | ||
| // iterates over arrays. | ||
| try { | ||
| Object.defineProperty && Object.defineProperty( | ||
| Array.prototype, | ||
| '__ARRAY_ENUMERATION_GUARD__', | ||
| { | ||
| configurable: true, | ||
| enumerable: true, | ||
| get: function() { | ||
| console.error( | ||
| 'Your code is broken! Do not iterate over arrays with ' + | ||
| 'for...in. See https://fburl.com/31944000 for more information.' | ||
| ); | ||
| } | ||
| } | ||
| ); | ||
| } catch (e) { | ||
| // Nothing | ||
| } | ||
| } | ||
|
|
||
| // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/findIndex | ||
| function findIndex(predicate, context) { | ||
| /** | ||
| * Why am I seeing this "findIndex" method as a value in my array!? | ||
| * | ||
| * We polyfill the "findIndex" method -- called like | ||
| * `[1, 2, 3].findIndex(1)` -- for older browsers. A side effect of the way | ||
| * we do that is that the method is enumerable. If you were incorrectly | ||
| * iterating over your array using the object property iterator syntax | ||
| * `for (key in obj)` you will see the method name "findIndex" as a key. | ||
| * | ||
| * To fix your code please do one of the following: | ||
| * | ||
| * - Use a regular for loop with index. | ||
| * - Use one of the array methods: a.forEach, a.map, etc. | ||
| * - Guard your body of your loop with a `arr.hasOwnProperty(key)` check. | ||
| * | ||
| * More info: | ||
| * https://our.intern.facebook.com/intern/dex/qa/669736606441771/ | ||
| */ | ||
| if (this == null) { | ||
| throw new TypeError( | ||
| 'Array.prototype.findIndex called on null or undefined' | ||
| ); | ||
| } | ||
| if (typeof predicate !== 'function') { | ||
| throw new TypeError('predicate must be a function'); | ||
| } | ||
| var list = Object(this); | ||
| var length = list.length >>> 0; | ||
| for (var i = 0; i < length; i++) { | ||
| if (predicate.call(context, list[i], i, list)) { | ||
| return i; | ||
| } | ||
| } | ||
| return -1; | ||
| } | ||
|
|
||
| if (!Array.prototype.findIndex) { | ||
| Array.prototype.findIndex = findIndex; | ||
| } | ||
|
|
||
| // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/find | ||
| if (!Array.prototype.find) { | ||
| Array.prototype.find = function(predicate, context) { | ||
| /** | ||
| * Why am I seeing this "find" method as a value in my array!? | ||
| * | ||
| * We polyfill the "find" method -- called like | ||
| * `[1, 2, 3].find(1)` -- for older browsers. A side effect of the way | ||
| * we do that is that the method is enumerable. If you were incorrectly | ||
| * iterating over your array using the object property iterator syntax | ||
| * `for (key in obj)` you will see the method name "find" as a key. | ||
| * | ||
| * To fix your code please do one of the following: | ||
| * | ||
| * - Use a regular for loop with index. | ||
| * - Use one of the array methods: a.forEach, a.map, etc. | ||
| * - Guard your body of your loop with a `arr.hasOwnProperty(key)` check. | ||
| * | ||
| * More info: | ||
| * https://our.intern.facebook.com/intern/dex/qa/669736606441771/ | ||
This comment has been minimized.
Sorry, something went wrong.
This comment has been minimized.
Sorry, something went wrong. |
||
| */ | ||
| if (this == null) { | ||
| throw new TypeError('Array.prototype.find called on null or undefined'); | ||
| } | ||
| var index = findIndex.call(this, predicate, context); | ||
| return index === -1 ? undefined : this[index]; | ||
| }; | ||
| } | ||
| })(); | ||
@yungsters fyi