New Twiddle

components.my-component\.js

import { Promise as EmberPromise } from 'rsvp';

// import Component from '@glimmer/component';

// export default class extends Component {
// }

import Component from '@ember/component';

export default Component.extend({
  data: '0',
	async init() {
    this._super(...arguments);
    console.log('init')
    
    let self = this;
    let promise = new EmberPromise(function(resolve, reject) {
			console.log('inside promise');
      setTimeout(function() {
        console.log('inside timeout');
        self.set('data', '100');
        resolve("done");
      }, 5000);
    });

    console.log('here before promise');
		await promise;

    console.log('here before return');
    return;
  },
  
  didRender() {
		this._super(...arguments);
    console.log('didRender');
  },

  willRender() {
		this._super(...arguments);
    console.log('willRender')
  }
});

controllers.application\.js

import Controller from '@ember/controller';

export default class ApplicationController extends Controller {
  appName = 'Ember Twiddle';
}

templates.application\.hbs

<h1>Welcome to {{this.appName}}</h1>
<br>
<br>
{{my-component}}
{{outlet}}
<br>
<br>

templates.components.my-component\.hbs

there 
data is {{data}}
{{yield}}

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": "3.18.1",
    "ember-template-compiler": "3.18.1",
    "ember-testing": "3.18.1"
  },
  "addons": {
    "@glimmer/component": "1.0.0"
  }
}