app.js

define(function(require, exports, module) {
  'use strict';

  var Ember = require('ember');

  var App = Ember.Application.create({
    rootElement: 'main',
    Router: require('router')
  });

  // Defer readiness as we are using RequireJS and we want to ensure everything
  // has been properly loaded, before initializing.
  App.deferReadiness();

  module.exports = App;
});

main.js

require(['config'], function() {
  require([
    'app',

    'application/index',
    'user/index'
  ], function(App) {
    App.advanceReadiness();
  });
});

router.js

define(function(require, exports, module) {
  'use strict';

  var Ember = require('ember');

  var Router = Ember.Router.extend({
    location: 'history'
  });

  Router.map(function() {
    this.resource('user', function() {
      this.resource('user.edit', { path: '/:user_id' });
      this.route('new');
    });

    this.resource('user.print', { path: '/user/:user_id/print' });
  });

  module.exports = Router;
});