Definindo um módulo com RequireJs e Module Patten

main.js

require(['jquery', 'app/mymodule'], function($, MyModule){

    MyModule.initialize();

});

mymodule.js

define((function(win, doc, undefined) {
    'use strict';

    function MyModule()
    {
        var $public = {}
        var $private = {}

        $public.initialize = function initialize(angle)
        {
            $private.myMethod();
        }

        $private.myMethod = function myMethod()
        {
            console.log('Testing...');
        }

        return $public;
    }

    win.MyModule = win.MyModule || {};
    win.MyModule = MyModule();

    return win.MyModule;

})(window, document));