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revert back to our own Array.from polyfill
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,94 @@ | ||
| // Be careful not to import anything from this file; it's imported very early | ||
| // in our import order by polyfills.js and mustn't import anything that might | ||
| // depend on a different polyfill. | ||
| // | ||
| // Ideally we'd use core-js-pure's version of this rather than defining our | ||
| // own, but that triggers a bug in vitest's module loader. | ||
| // | ||
| // See https://github.com/dequelabs/axe-core/issues/4458 | ||
| // Production steps of ECMA-262, Edition 6, 22.1.2.1 | ||
| export default (function () { | ||
| var toStr = Object.prototype.toString; | ||
| var isCallable = function (fn) { | ||
| return typeof fn === 'function' || toStr.call(fn) === '[object Function]'; | ||
| }; | ||
| var toInteger = function (value) { | ||
| var number = Number(value); | ||
| if (isNaN(number)) { | ||
| return 0; | ||
| } | ||
| if (number === 0 || !isFinite(number)) { | ||
| return number; | ||
| } | ||
| return (number > 0 ? 1 : -1) * Math.floor(Math.abs(number)); | ||
| }; | ||
| var maxSafeInteger = Math.pow(2, 53) - 1; | ||
| var toLength = function (value) { | ||
| var len = toInteger(value); | ||
| return Math.min(Math.max(len, 0), maxSafeInteger); | ||
| }; | ||
|
|
||
| // The length property of the from method is 1. | ||
| return function from(arrayLike /*, mapFn, thisArg */) { | ||
| // 1. Let C be the this value. | ||
| var C = this; | ||
|
|
||
| // 2. Let items be ToObject(arrayLike). | ||
| var items = Object(arrayLike); | ||
|
|
||
| // 3. ReturnIfAbrupt(items). | ||
| if (arrayLike == null) { | ||
| throw new TypeError( | ||
| 'Array.from requires an array-like object - not null or undefined' | ||
| ); | ||
| } | ||
|
|
||
| // 4. If mapfn is undefined, then let mapping be false. | ||
| var mapFn = arguments.length > 1 ? arguments[1] : void undefined; | ||
| var T; | ||
| if (typeof mapFn !== 'undefined') { | ||
| // 5. else | ||
| // 5. a If IsCallable(mapfn) is false, throw a TypeError exception. | ||
| if (!isCallable(mapFn)) { | ||
| throw new TypeError( | ||
| 'Array.from: when provided, the second argument must be a function' | ||
| ); | ||
| } | ||
|
|
||
| // 5. b. If thisArg was supplied, let T be thisArg; else let T be undefined. | ||
| if (arguments.length > 2) { | ||
| T = arguments[2]; | ||
| } | ||
| } | ||
|
|
||
| // 10. Let lenValue be Get(items, "length"). | ||
| // 11. Let len be ToLength(lenValue). | ||
| var len = toLength(items.length); | ||
|
|
||
| // 13. If IsConstructor(C) is true, then | ||
| // 13. a. Let A be the result of calling the [[Construct]] internal method of C with an argument list containing the single item len. | ||
| // 14. a. Else, Let A be ArrayCreate(len). | ||
| var A = isCallable(C) ? Object(new C(len)) : new Array(len); | ||
|
|
||
| // 16. Let k be 0. | ||
| var k = 0; | ||
| // 17. Repeat, while k < len… (also steps a - h) | ||
| var kValue; | ||
| while (k < len) { | ||
| kValue = items[k]; | ||
| if (mapFn) { | ||
| A[k] = | ||
| typeof T === 'undefined' | ||
| ? mapFn(kValue, k) | ||
| : mapFn.call(T, kValue, k); | ||
| } else { | ||
| A[k] = kValue; | ||
| } | ||
| k += 1; | ||
| } | ||
| // 18. Let putStatus be Put(A, "length", len, true). | ||
| A.length = len; | ||
| // 20. Return A. | ||
| return A; | ||
| }; | ||
| })(); |