35 lines
1.2 KiB
JavaScript
35 lines
1.2 KiB
JavaScript
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'use strict';
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// 19.1.2.1 Object.assign(target, source, ...)
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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) if (isEnum.call(S, key = keys[j++])) T[key] = S[key];
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} return T;
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} : $assign;
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