New Twiddle

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

initializers.app-init.js

import Ember from 'ember';

var id = 0;

export function initialize(application) {
  application.register('foo:bar', Ember.Object.extend({
    id: Ember.computed(function() {
      return ++id;
    })
  }), { singleton: false });
  application.inject('component', 'foo', 'foo:bar');
}

export default {
  name: 'app-init',
  initialize
};

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
{{ my-component }}
{{ my-component }}
{{ my-component }}

templates.components.my-component.hbs

id: {{foo.id}}

twiddle.json

{
  "version": "0.10.6",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "release",
    "ember-template-compiler": "release",
    "ember-testing": "release"
  },
  "addons": {}
}