New Twiddle

controllers.application\.js

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

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

	get trackedCount() {
  	return this.myService.count;
  }

	@computed("myService.count")
	get computedCount() {
  	return this.myService.count;
  }
}

services.my-service\.js

import Service from '@ember/service';
import { tracked } from "@glimmer/tracking";
import { action, set } from "@ember/object";

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

  @action
	increaseCount() {
		set(this, "count", this.count + 1);
  }
};

templates.application\.hbs

<h2>[Tracked] Count: {{this.trackedCount}}</h2>
<h2>[Computed] Count: {{this.computedCount}}</h2>
<button type="button" {{on "click" (action this.myService.increaseCount)}}>Increase Count</button>

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": "3.20.0",
    "ember-template-compiler": "3.20.0",
    "ember-testing": "3.18.1"
  },
  "addons": {
    "@glimmer/component": "1.0.0"
  }
}