Ember Evented Example

components.subscriber\.js

import Component from '@glimmer/component';
import { inject } from '@ember/service';
import { tracked } from '@glimmer/tracking';

export default class extends Component {
	@inject
  publisher;
  
  @tracked
  tick = 0;
  
  constructor(){
  	super(...arguments);
    this.publisher.on('updateTick', () => {
      this.tick = this.tick + 1;
    });    
  }
}

controllers.application\.js

import Controller from '@ember/controller';

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

services.publisher\.js

import Service from '@ember/service';
import Evented from '@ember/object/evented';

export default class Publisher extends Service.extend(Evented){
  constructor(){
    super(...arguments);
  	setInterval(() => { 
      this.trigger("updateTick");
    }, 1000);
  }
}

templates.application\.hbs

<h1>Welcome to {{this.appName}}</h1>
<br>
<br>
<Subscriber/>
<br>
<br>

templates.components.subscriber\.hbs

Current Tick: {{this.tick}}

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"
  }
}