Require.js configuration with Backbone, Mocha and Chai

gistfile1.js

require.config({
  urlArgs: "v=" +  (new Date()).getTime(),
  paths: {
    jquery:         'libs/jquery',
    underscore:     'libs/lodash',
    backbone:       'libs/backbone',
    text:           'libs/text',

    ast_model:      'app/models/ast_model',
    foo_model:      'app/models/foo_model',

    debug_view:     'app/views/debug_view',
    workbench_view: 'app/views/workbench_view',

    mocha:          'spec/libs/mocha',
    chai:           'spec/libs/chai',
    ast_model_spec: 'spec/models/ast_model_spec',
  },
  shim: {
    backbone: {
      deps: ['underscore', 'jquery'],
      exports: 'Backbone'
    },

    mocha: {
      deps: ['chai'],
      init: function(chai) {
        chai.should();
        mocha.setup('bdd');
        return mocha;
      }
    }
  }
});

require([
  'app'
], function(app){
  app.initialize();
});