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

	var foo = { value: 1 };

	function mutate ( obj ) {
		obj.value += 1;
		return obj;
	}

	mutate( foo );

	assert.equal( foo.value, 2 );

}));