A Mojo->Dojo connector; re-implement these methods in another library, and you can use Mojo 2.0 without Dojo.

mojo_dojo_connector.js

/* Mojo-Dojo connector */
(function() {
  if(typeof mojo == 'undefined') mojo = {};

  mojo.addOnUnload = dojo.addOnUnload;
  mojo.clone = dojo.clone;
  mojo.config = dojo.config;
  mojo.connect = dojo.connect;
  mojo.declare = dojo.declare;
  mojo.destroyElement = dojo._destroyElement;
  mojo.disconnect = dojo.disconnect;
  mojo.hasClass = dojo.hasClass;
  mojo.hitch = dojo.hitch;
  mojo.isArray = dojo.isArray;
  mojo.isObject = dojo.isObject;
  mojo.isString = dojo.isString;
  mojo.place = dojo.place;
  mojo.provide = dojo.provide;
  mojo.publish = dojo.publish;
  mojo.query = dojo.query;
  mojo.registerModulePath = dojo.registerModulePath;
  mojo.require = dojo.require;
  mojo.string = dojo.string;
  mojo.style = dojo.style;
  mojo.subscribe = dojo.subscribe;
  mojo.unsubscribe = dojo.unsubscribe;
})();

https://gist.github.com/1192286

mojo.define("app.controller.RegistrationController", {
  addObservers: function() {

  },
  addCommands: function() {

  },
  addIntercepts: function() {

  }
});