Namespaced singletone shortcut

namespace.singletone.js

// Create global namespace
App = {};

// Attach your singletone method as shortcut inside
App.Event = (function() {
    var instance;
    return function() {
        if (!instance) {
            instance = new Event();
        }
        return instance;
    };
}());


// Then you can use single instance like this (in the case of Event.js):
App.Event().on('done' , function() {});
App.Event().trigger('done');