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- 'use strict';
- // modified from https://github.com/es-shims/es6-shim
- var keys = require('object-keys');
- var bind = require('function-bind');
- var canBeObject = function (obj) {
- return typeof obj !== 'undefined' && obj !== null;
- };
- var hasSymbols = require('has-symbols/shams')();
- var toObject = Object;
- var push = bind.call(Function.call, Array.prototype.push);
- var propIsEnumerable = bind.call(Function.call, Object.prototype.propertyIsEnumerable);
- var originalGetSymbols = hasSymbols ? Object.getOwnPropertySymbols : null;
- module.exports = function assign(target, source1) {
- if (!canBeObject(target)) { throw new TypeError('target must be an object'); }
- var objTarget = toObject(target);
- var s, source, i, props, syms, value, key;
- for (s = 1; s < arguments.length; ++s) {
- source = toObject(arguments[s]);
- props = keys(source);
- var getSymbols = hasSymbols && (Object.getOwnPropertySymbols || originalGetSymbols);
- if (getSymbols) {
- syms = getSymbols(source);
- for (i = 0; i < syms.length; ++i) {
- key = syms[i];
- if (propIsEnumerable(source, key)) {
- push(props, key);
- }
- }
- }
- for (i = 0; i < props.length; ++i) {
- key = props[i];
- value = source[key];
- if (propIsEnumerable(source, key)) {
- objTarget[key] = value;
- }
- }
- }
- return objTarget;
- };
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