service-instances

components.my-component\.js

import Component from '@glimmer/component';
import MyService from '../services/my-service';

export default class Example extends Component {
  myService = MyService.create();
}

controllers.application\.js

import Controller from '@ember/controller';

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

services.my-service\.js

import Service from '@ember/service';
import { tracked } from '@glimmer/tracking';

export default class MyService extends Service {
  @tracked count = 0;

  increment = () => (this.count++);
}

templates.application\.hbs

<MyComponent @name="A" />
<MyComponent @name="B" />

templates.components.my-component\.hbs

<div>
<p>Component {{@name}} has been clicked {{this.myService.count}} times.</p>
<button {{on "click" this.myService.increment}}>Click me</button>
</div>

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"
  }
}