New Twiddle

controllers.application.js

import Ember from 'ember';

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

routes.application.js

import Ember from 'ember';
import RSVP from 'rsvp';

export default Ember.Route.extend({
  beforeModel() {
    return new RSVP.Promise(resolve => {
      Ember.run.later(() => resolve(), 1500)
    });
  },
  
  model() {
    return "Hello from application route";
  }
});

routes.index.js

import Ember from 'ember';
import RSVP from 'rsvp';

export default Ember.Route.extend({
  model() {
    return new RSVP.Promise(resolve => {
      Ember.run.later(() => resolve(), 1500);
    });
  }
});

templates.application-loading.hbs

<h1>Loading application</h1>

templates.application.hbs

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

templates.index-loading.hbs

<h1>Loading index</h1>

templates.index.hbs

<h2>Hello from resolved index</h2>

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"
  }
}