New Twiddle

controllers.application\.js

import Controller from '@ember/controller';
import { computed } from '@ember/object';
import { later } from '@ember/runloop';

export default Controller.extend({
  appName: 'Ember Twiddle',

	bar: null,
	
	foo: computed('bar', async function() {
    await new Promise((resolve) => {
    	later(resolve('blah'), 1000)
    }); 
    
    this.set('foo', 'baz');
  })
});

templates.application\.hbs

<h1>Welcome to {{this.appName}}</h1>
<br>
{{foo}}
<br>
{{outlet}}
<br>
<br>

twiddle\.json

{
  "version": "0.17.1",
  "EmberENV": {
    "FEATURES": {},
    "_TEMPLATE_ONLY_GLIMMER_COMPONENTS": false,
    "_APPLICATION_TEMPLATE_WRAPPER": true,
    "_JQUERY_INTEGRATION": true
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.js",
    "ember": "2.18.2",
    "ember-template-compiler": "2.18.2",
    "ember-testing": "2.18.2"
  },
  "addons": {
    "@glimmer/component": "1.0.0"
  }
}