source: trip-planner-front/node_modules/object-assign/index.js@ 571e0df

Last change on this file since 571e0df was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago

initial commit

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Line 
1/*
2object-assign
3(c) Sindre Sorhus
4@license MIT
5*/
6
7'use strict';
8/* eslint-disable no-unused-vars */
9var getOwnPropertySymbols = Object.getOwnPropertySymbols;
10var hasOwnProperty = Object.prototype.hasOwnProperty;
11var propIsEnumerable = Object.prototype.propertyIsEnumerable;
12
13function toObject(val) {
14 if (val === null || val === undefined) {
15 throw new TypeError('Object.assign cannot be called with null or undefined');
16 }
17
18 return Object(val);
19}
20
21function shouldUseNative() {
22 try {
23 if (!Object.assign) {
24 return false;
25 }
26
27 // Detect buggy property enumeration order in older V8 versions.
28
29 // https://bugs.chromium.org/p/v8/issues/detail?id=4118
30 var test1 = new String('abc'); // eslint-disable-line no-new-wrappers
31 test1[5] = 'de';
32 if (Object.getOwnPropertyNames(test1)[0] === '5') {
33 return false;
34 }
35
36 // https://bugs.chromium.org/p/v8/issues/detail?id=3056
37 var test2 = {};
38 for (var i = 0; i < 10; i++) {
39 test2['_' + String.fromCharCode(i)] = i;
40 }
41 var order2 = Object.getOwnPropertyNames(test2).map(function (n) {
42 return test2[n];
43 });
44 if (order2.join('') !== '0123456789') {
45 return false;
46 }
47
48 // https://bugs.chromium.org/p/v8/issues/detail?id=3056
49 var test3 = {};
50 'abcdefghijklmnopqrst'.split('').forEach(function (letter) {
51 test3[letter] = letter;
52 });
53 if (Object.keys(Object.assign({}, test3)).join('') !==
54 'abcdefghijklmnopqrst') {
55 return false;
56 }
57
58 return true;
59 } catch (err) {
60 // We don't expect any of the above to throw, but better to be safe.
61 return false;
62 }
63}
64
65module.exports = shouldUseNative() ? Object.assign : function (target, source) {
66 var from;
67 var to = toObject(target);
68 var symbols;
69
70 for (var s = 1; s < arguments.length; s++) {
71 from = Object(arguments[s]);
72
73 for (var key in from) {
74 if (hasOwnProperty.call(from, key)) {
75 to[key] = from[key];
76 }
77 }
78
79 if (getOwnPropertySymbols) {
80 symbols = getOwnPropertySymbols(from);
81 for (var i = 0; i < symbols.length; i++) {
82 if (propIsEnumerable.call(from, symbols[i])) {
83 to[symbols[i]] = from[symbols[i]];
84 }
85 }
86 }
87 }
88
89 return to;
90};
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