New Twiddle

components.my-component.js

import Component from '@ember/component';
import hbs from 'htmlbars-inline-precompile';

let MysteryTour = Component.extend({
  layout: hbs`<h2>This is a thing</h2>`
})

export default Component.extend({
  layout: hbs`<this.MysteryTour />`,
  MysteryTour
})

controllers.application.js

import Ember from 'ember';

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

templates.application.hbs

<MyComponent/>

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"
  }
}