1 | 'use strict';
|
2 | var DESCRIPTORS = require('../internals/descriptors');
|
3 | var fails = require('../internals/fails');
|
4 | var objectKeys = require('../internals/object-keys');
|
5 | var getOwnPropertySymbolsModule = require('../internals/object-get-own-property-symbols');
|
6 | var propertyIsEnumerableModule = require('../internals/object-property-is-enumerable');
|
7 | var toObject = require('../internals/to-object');
|
8 | var IndexedObject = require('../internals/indexed-object');
|
9 |
|
10 | var nativeAssign = Object.assign;
|
11 |
|
12 |
|
13 |
|
14 |
|
15 | module.exports = !nativeAssign || fails(function () {
|
16 | var A = {};
|
17 | var B = {};
|
18 |
|
19 | var symbol = Symbol();
|
20 | var alphabet = 'abcdefghijklmnopqrst';
|
21 | A[symbol] = 7;
|
22 | alphabet.split('').forEach(function (chr) { B[chr] = chr; });
|
23 | return nativeAssign({}, A)[symbol] != 7 || objectKeys(nativeAssign({}, B)).join('') != alphabet;
|
24 | }) ? function assign(target, source) {
|
25 | var T = toObject(target);
|
26 | var argumentsLength = arguments.length;
|
27 | var index = 1;
|
28 | var getOwnPropertySymbols = getOwnPropertySymbolsModule.f;
|
29 | var propertyIsEnumerable = propertyIsEnumerableModule.f;
|
30 | while (argumentsLength > index) {
|
31 | var S = IndexedObject(arguments[index++]);
|
32 | var keys = getOwnPropertySymbols ? objectKeys(S).concat(getOwnPropertySymbols(S)) : objectKeys(S);
|
33 | var length = keys.length;
|
34 | var j = 0;
|
35 | var key;
|
36 | while (length > j) {
|
37 | key = keys[j++];
|
38 | if (!DESCRIPTORS || propertyIsEnumerable.call(S, key)) T[key] = S[key];
|
39 | }
|
40 | } return T;
|
41 | } : nativeAssign;
|