You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
52 lines
2.0 KiB
52 lines
2.0 KiB
'use strict'; |
|
var DESCRIPTORS = require('../internals/descriptors'); |
|
var fails = require('../internals/fails'); |
|
var objectKeys = require('../internals/object-keys'); |
|
var getOwnPropertySymbolsModule = require('../internals/object-get-own-property-symbols'); |
|
var propertyIsEnumerableModule = require('../internals/object-property-is-enumerable'); |
|
var toObject = require('../internals/to-object'); |
|
var IndexedObject = require('../internals/indexed-object'); |
|
|
|
var nativeAssign = Object.assign; |
|
var defineProperty = Object.defineProperty; |
|
|
|
// `Object.assign` method |
|
// https://tc39.github.io/ecma262/#sec-object.assign |
|
module.exports = !nativeAssign || fails(function () { |
|
// should have correct order of operations (Edge bug) |
|
if (DESCRIPTORS && nativeAssign({ b: 1 }, nativeAssign(defineProperty({}, 'a', { |
|
enumerable: true, |
|
get: function () { |
|
defineProperty(this, 'b', { |
|
value: 3, |
|
enumerable: false |
|
}); |
|
} |
|
}), { b: 2 })).b !== 1) return true; |
|
// should work with symbols and should have deterministic property order (V8 bug) |
|
var A = {}; |
|
var B = {}; |
|
// eslint-disable-next-line no-undef |
|
var symbol = Symbol(); |
|
var alphabet = 'abcdefghijklmnopqrst'; |
|
A[symbol] = 7; |
|
alphabet.split('').forEach(function (chr) { B[chr] = chr; }); |
|
return nativeAssign({}, A)[symbol] != 7 || objectKeys(nativeAssign({}, B)).join('') != alphabet; |
|
}) ? function assign(target, source) { // eslint-disable-line no-unused-vars |
|
var T = toObject(target); |
|
var argumentsLength = arguments.length; |
|
var index = 1; |
|
var getOwnPropertySymbols = getOwnPropertySymbolsModule.f; |
|
var propertyIsEnumerable = propertyIsEnumerableModule.f; |
|
while (argumentsLength > index) { |
|
var S = IndexedObject(arguments[index++]); |
|
var keys = getOwnPropertySymbols ? objectKeys(S).concat(getOwnPropertySymbols(S)) : objectKeys(S); |
|
var length = keys.length; |
|
var j = 0; |
|
var key; |
|
while (length > j) { |
|
key = keys[j++]; |
|
if (!DESCRIPTORS || propertyIsEnumerable.call(S, key)) T[key] = S[key]; |
|
} |
|
} return T; |
|
} : nativeAssign;
|
|
|