New Twiddle

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  
  data: Ember.computed(function() {
    const owner = Ember.getOwner(this);
    return owner.lookup('service:wat').getData();
  })
 
});

services.wat.js

export default class Wat {
  constructor(createArgs) {
     Object.assign(this, createArgs);
  }
  
  getData() {
    return { name: 'Chris' };
  }
  
  static create(options) {
    return new this(options);
  }
}

templates.application.hbs

<h1>Welcome to {{data.name}}</h1>
<br>
<br>
{{outlet}}
<br>
<br>

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": "3.4.3",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3"
  },
  "addons": {
    "ember-data": "3.4.2"
  }
}