(function (global, factory) {
	typeof exports === 'object' && typeof module !== 'undefined' ? factory() :
	typeof define === 'function' && define.amd ? define(factory) :
	factory();
}(this, function () { 'use strict';

	var foo = {};

	mutate1( foo );

	// should be included
	[ 'a', 'b', 'c' ].forEach( function ( letter, i ) {
		foo[ letter ] = i;
	});

	[ 'd', 'e', 'f' ].forEach( ( letter, i ) => {
		foo[ letter ] = i;
	});

	function mutate1 () {
		foo.mutated = 1;
	}

	({
		mutate2: function () {
			foo.mutated = 2;
		}
	}).mutate2();

	console.log( foo );

}));