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Object.assign shim

An Object.assign shim.

This script should not be not be installed directly. It is a library for other scripts to include with the meta directive // @require https://update.greasyfork.org/scripts/2666/7344/Objectassign%20shim.js 

// ==UserScript==
// @name        Object.assign shim
// @description An Object.assign shim.
// @version     0.13.0
// @license     MIT License;
// ==/UserScript==
// modified from https://github.com/es-shims/es6-shim
(function(){
	'use strict';
	
	var isObject = function (obj) {
		return obj && typeof obj === 'object';
	};

	if(Object.assign) return;
	Object.defineProperty(Object, 'assign', {
		value: function(target, source){
			var s, i, props;
			if (!isObject(target)) { throw new TypeError('target must be an object'); }
			for (s = 1; s < arguments.length; ++s) {
				source = arguments[s];
				if (!isObject(source)) { throw new TypeError('source ' + s + ' must be an object'); }
				props = Object.keys(Object(source));
				for (i = 0; i < props.length; ++i) {
					target[props[i]] = source[props[i]];
				}
			}
			return target;
		},
		enumerable: false
	});
})();