// Object Literal
    var MyModule = {
        property: 'someValue',
        method: function () { }
    };


    // Module Pattern
    var Module = (function () {

        // Private state
        var privateVar,
            privateMethod;

        privateMethod = function() { };
        
        // Public state
        return {
            publicVar: 'someValue',
            publicMethod: function() { }
        };
    
    })();

    
    // app.js
    var App = {};
    
    // Code goes here
    
    window.App = App;

    
    // cart.js
    function Cart() { }
    
    App.Cart = new Cart();


    // overlay.js
    function Overlay() { }

    App.Overlay = new Overlay();

    
    // app.js
    require(['lib/jquery', './cart', './overlay'], function($, Cart, Overlay) {
        // Code goes here
    });

    
    // cart.js
    define(['lib/jquery'], function($) {
        function Cart() { }
        return new Cart();
    });


    // overlay.js
    define(['lib/jquery'], function($) {
        function Overlay() { }
        return new Overlay();
    });

    
    // app.js
    var $ = require('jquery');
    var Cart = require('./cart');
    var Overlay = require('./overlay');

    // Code goes here
    

    // cart.js
    var $ = require('jquery');
    
    function Cart() { }

    module.exports = new Cart();


    // overlay.js
    var $ = require('jquery');
    
    function Overlay() { }

    module.exports = new Overlay();

    
    // app.js
    import $ from 'lib/jquery';
    import Cart from './cart';
    import Overlay from './overlay';

    // Code goes here

    
    // cart.js
    import $ from 'lib/jquery';

    function Cart() { }

    export default new Cart()


    // overlay.js
    import $ from 'lib/jquery';

    function Overlay() { }

    export default new Overlay()