43 lines
1.4 KiB
JavaScript
43 lines
1.4 KiB
JavaScript
/**
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* @file
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* Provides a polyfill for Object.assign().
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*
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* This is needed for Internet Explorer 11 and Opera Mini.
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*
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* This has been copied from MDN Web Docs code samples. Code samples in the MDN
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* Web Docs are licensed under CC0.
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*
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* @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign#Polyfill
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* @see https://developer.mozilla.org/en-US/docs/MDN/About#Code_samples_and_snippets
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*/
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if (typeof Object.assign !== 'function') {
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// Must be writable: true, enumerable: false, configurable: true
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Object.defineProperty(Object, 'assign', {
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value: function assign(target, varArgs) {
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// .length of function is 2
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'use strict';
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if (target === null || target === undefined) {
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throw new TypeError('Cannot convert undefined or null to object');
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}
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var to = Object(target);
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for (var index = 1; index < arguments.length; index++) {
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var nextSource = arguments[index];
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if (nextSource !== null && nextSource !== undefined) {
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for (var nextKey in nextSource) {
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// Avoid bugs when hasOwnProperty is shadowed
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if (Object.prototype.hasOwnProperty.call(nextSource, nextKey)) {
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to[nextKey] = nextSource[nextKey];
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}
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}
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}
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}
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return to;
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},
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writable: true,
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configurable: true,
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});
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}
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