Reference 3.3

controllers.application.js

import Ember from 'ember';
const reference = {
  foo: 'bar'
}
export default Ember.Controller.extend({
  appName: 'Ember Twiddle ' + Ember.VERSION,
  initialValue: reference,
  currentValue: reference,
  actions: {
   changeRef () {
     this.set('currentValue.foo', 'Changed')
   }
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
{{initialValue.foo}}
<br>
{{currentValue.foo}}
<br>
<br>

<button {{action "changeRef"}}>Change new</button>

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.3.2",
    "ember-template-compiler": "3.3.2",
    "ember-testing": "3.3.2"
  },
  "addons": {
    "ember-data": "3.4.2"
  }
}