Singleton class in Coffeescript

main_screen.coffee

MainScreen = new class extends Screen
  doSomething: (window) ->
    window.buttons()[0].tap()

main_screen.js

// Generated by CoffeeScript 1.3.3
var MainScreen,
  __hasProp = {}.hasOwnProperty,
  __extends = function(child, parent) { for (var key in parent) { if (__hasProp.call(parent, key)) child[key] = parent[key]; } function ctor() { this.constructor = child; } ctor.prototype = parent.prototype; child.prototype = new ctor(); child.__super__ = parent.prototype; return child; };

MainScreen = new ((function(_super) {

  __extends(_Class, _super);

  function _Class() {
    return _Class.__super__.constructor.apply(this, arguments);
  }

  _Class.prototype.doSomething = function(window) {
    return window.buttons()[0].tap();
  };

  return _Class;

})(Screen));