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57 lines
2.3 KiB
57 lines
2.3 KiB
'use strict'; |
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var DESCRIPTORS = require('../internals/descriptors'); |
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var uncurryThis = require('../internals/function-uncurry-this'); |
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var call = require('../internals/function-call'); |
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var fails = require('../internals/fails'); |
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var objectKeys = require('../internals/object-keys'); |
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var getOwnPropertySymbolsModule = require('../internals/object-get-own-property-symbols'); |
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var propertyIsEnumerableModule = require('../internals/object-property-is-enumerable'); |
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var toObject = require('../internals/to-object'); |
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var IndexedObject = require('../internals/indexed-object'); |
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// eslint-disable-next-line es-x/no-object-assign -- safe |
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var $assign = Object.assign; |
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// eslint-disable-next-line es-x/no-object-defineproperty -- required for testing |
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var defineProperty = Object.defineProperty; |
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var concat = uncurryThis([].concat); |
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// `Object.assign` method |
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// https://tc39.es/ecma262/#sec-object.assign |
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module.exports = !$assign || fails(function () { |
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// should have correct order of operations (Edge bug) |
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if (DESCRIPTORS && $assign({ b: 1 }, $assign(defineProperty({}, 'a', { |
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enumerable: true, |
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get: function () { |
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defineProperty(this, 'b', { |
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value: 3, |
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enumerable: false |
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}); |
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} |
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}), { b: 2 })).b !== 1) return true; |
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// should work with symbols and should have deterministic property order (V8 bug) |
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var A = {}; |
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var B = {}; |
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// eslint-disable-next-line es-x/no-symbol -- safe |
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var symbol = Symbol(); |
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var alphabet = 'abcdefghijklmnopqrst'; |
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A[symbol] = 7; |
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alphabet.split('').forEach(function (chr) { B[chr] = chr; }); |
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return $assign({}, A)[symbol] != 7 || objectKeys($assign({}, B)).join('') != alphabet; |
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}) ? function assign(target, source) { // eslint-disable-line no-unused-vars -- required for `.length` |
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var T = toObject(target); |
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var argumentsLength = arguments.length; |
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var index = 1; |
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var getOwnPropertySymbols = getOwnPropertySymbolsModule.f; |
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var propertyIsEnumerable = propertyIsEnumerableModule.f; |
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while (argumentsLength > index) { |
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var S = IndexedObject(arguments[index++]); |
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var keys = getOwnPropertySymbols ? concat(objectKeys(S), getOwnPropertySymbols(S)) : objectKeys(S); |
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var length = keys.length; |
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var j = 0; |
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var key; |
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while (length > j) { |
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key = keys[j++]; |
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if (!DESCRIPTORS || call(propertyIsEnumerable, S, key)) T[key] = S[key]; |
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} |
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} return T; |
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} : $assign;
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