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38 lines
1.3 KiB
38 lines
1.3 KiB
'use strict'; |
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// 19.1.2.1 Object.assign(target, source, ...) |
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var DESCRIPTORS = require('./_descriptors'); |
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var getKeys = require('./_object-keys'); |
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var gOPS = require('./_object-gops'); |
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var pIE = require('./_object-pie'); |
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var toObject = require('./_to-object'); |
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var IObject = require('./_iobject'); |
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var $assign = Object.assign; |
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// should work with symbols and should have deterministic property order (V8 bug) |
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module.exports = !$assign || require('./_fails')(function () { |
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var A = {}; |
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var B = {}; |
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// eslint-disable-next-line no-undef |
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var S = Symbol(); |
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var K = 'abcdefghijklmnopqrst'; |
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A[S] = 7; |
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K.split('').forEach(function (k) { B[k] = k; }); |
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return $assign({}, A)[S] != 7 || Object.keys($assign({}, B)).join('') != K; |
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}) ? function assign(target, source) { // eslint-disable-line no-unused-vars |
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var T = toObject(target); |
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var aLen = arguments.length; |
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var index = 1; |
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var getSymbols = gOPS.f; |
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var isEnum = pIE.f; |
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while (aLen > index) { |
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var S = IObject(arguments[index++]); |
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var keys = getSymbols ? getKeys(S).concat(getSymbols(S)) : getKeys(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 || isEnum.call(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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