New Twiddle

controllers.application.js

import Ember from 'ember';
let count = 0
export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  model: {}
 	notified: Ember.computed('model', () => ++count),
  actions: {
   notify() {
  	// this.get('model').notifyPropertyChange('request')
    this.notifyPropertyChange('model') 
   }
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{notified}}
<br>
<br>

<button {{action "notify"}}>Notify</button>

twiddle.json

{
  "version": "0.15.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.2.2",
    "ember-template-compiler": "3.2.2",
    "ember-testing": "3.2.2"
  },
  "addons": {
    "ember-data": "3.2.0"
  }
}