New Twiddle

controllers.application\.js

import Controller from '@ember/controller';
import { inject as service } from '@ember/service';

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

	@service
	myService;
}

services.my-service\.js

import Service from '@ember/service';

export default Service.extend({
  fetchPosts() {
    console.log('fetching..');
  	return window.fetch('https://jsonplaceholder.typicode.com/photos').then((response) => {
    	return response.json();
    });
  }
});

templates.application\.hbs

<h1>Welcome to {{this.appName}}</h1>
<br>
  <Await @promise={{this.myService.fetchPosts}} as |await|>
    <await.Pending>
      Loading posts...
    </await.Pending>

    <await.Fulfilled as |posts|>
      {{#each posts as |post|}}
        {{post.id}}
      {{/each}}
    </await.Fulfilled>

    <await.Rejected>
      Something went wrong :(
    </await.Rejected>
  </Await>
<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": "3.18.1",
    "ember-template-compiler": "3.18.1",
    "ember-testing": "3.18.1" 
  },
  "addons": {
    "@glimmer/component": "1.0.0",
    "ember-await": "2.0.0"
  }
}