New Twiddle

controllers.application.js

import Ember from 'ember';
import DS from 'ember-data'
export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  foo: Ember.computed(() => {
    return DS.PromiseObject.create({
      	promise: new Promise(function(resolve) { 
       setTimeout(() => {resolve({bar: 42})}, 2000)
  	 })
    })
  }),
  isDisabled: Ember.computed('foo.bar', function () {
    let blah = this.get('foo.bar')  
    if (blah) {
     	return 'resolved'
    } else {
     return 'nope' 
    }
  })
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
{{isDisabled}}
<br>
<br>

twiddle.json

{
  "version": "0.13.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.16.2",
    "ember-template-compiler": "2.16.2",
    "ember-testing": "2.16.2"
  },
  "addons": {
    "ember-data": "2.16.3"
  }
}