123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657 |
- 'use strict';
- var DESCRIPTORS = require('../internals/descriptors');
- var uncurryThis = require('../internals/function-uncurry-this');
- var call = require('../internals/function-call');
- 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');
-
- // eslint-disable-next-line es/no-object-assign -- safe
- var $assign = Object.assign;
- // eslint-disable-next-line es/no-object-defineproperty -- required for testing
- var defineProperty = Object.defineProperty;
- var concat = uncurryThis([].concat);
-
- // `Object.assign` method
- // https://tc39.es/ecma262/#sec-object.assign
- module.exports = !$assign || fails(function () {
- // should have correct order of operations (Edge bug)
- if (DESCRIPTORS && $assign({ b: 1 }, $assign(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 es/no-symbol -- safe
- var symbol = Symbol('assign detection');
- var alphabet = 'abcdefghijklmnopqrst';
- A[symbol] = 7;
- alphabet.split('').forEach(function (chr) { B[chr] = chr; });
- return $assign({}, A)[symbol] !== 7 || objectKeys($assign({}, B)).join('') !== alphabet;
- }) ? function assign(target, source) { // eslint-disable-line no-unused-vars -- required for `.length`
- 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 ? concat(objectKeys(S), getOwnPropertySymbols(S)) : objectKeys(S);
- var length = keys.length;
- var j = 0;
- var key;
- while (length > j) {
- key = keys[j++];
- if (!DESCRIPTORS || call(propertyIsEnumerable, S, key)) T[key] = S[key];
- }
- } return T;
- } : $assign;
|