43 lines
1.3 KiB
JavaScript
43 lines
1.3 KiB
JavaScript
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'use strict';
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// modified from https://github.com/es-shims/es6-shim
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var keys = require('object-keys');
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var canBeObject = function (obj) {
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return typeof obj !== 'undefined' && obj !== null;
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};
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var hasSymbols = require('has-symbols/shams')();
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var callBound = require('call-bind/callBound');
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var toObject = Object;
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var $push = callBound('Array.prototype.push');
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var $propIsEnumerable = callBound('Object.prototype.propertyIsEnumerable');
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var originalGetSymbols = hasSymbols ? Object.getOwnPropertySymbols : null;
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// eslint-disable-next-line no-unused-vars
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module.exports = function assign(target, source1) {
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if (!canBeObject(target)) { throw new TypeError('target must be an object'); }
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var objTarget = toObject(target);
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var s, source, i, props, syms, value, key;
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for (s = 1; s < arguments.length; ++s) {
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source = toObject(arguments[s]);
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props = keys(source);
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var getSymbols = hasSymbols && (Object.getOwnPropertySymbols || originalGetSymbols);
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if (getSymbols) {
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syms = getSymbols(source);
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for (i = 0; i < syms.length; ++i) {
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key = syms[i];
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if ($propIsEnumerable(source, key)) {
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$push(props, key);
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}
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}
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}
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for (i = 0; i < props.length; ++i) {
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key = props[i];
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value = source[key];
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if ($propIsEnumerable(source, key)) {
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objTarget[key] = value;
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}
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}
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}
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return objTarget;
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};
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