New Twiddle

components.demo\.js

import Component from '@glimmer/component';
import { action } from '@ember/object';
import { inject as service } from '@ember/service';

export default class extends Component {
  appName = 'Ember Twiddle';

	@service state;

	@action increment() {
  	this.state.increment();
  }

	get value() {
  	return this.state.state.value;
  }
}

controllers.application\.js

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

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

services.state\.js

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

export default class extends Service {
  @tracked state = {
  	value: 1
  };

	increment() {
    this.state = {
    	...this.state,
      value: this.state.value + 1
    }
    console.log(this.state.value)
  }
};

templates.application\.hbs

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

<Demo />

templates.components.demo\.hbs

value: {{this.value}}

<button {{on 'click' this.increment}}>
	Increment
</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": "3.18.1",
    "ember-template-compiler": "3.18.1",
    "ember-testing": "3.18.1"
  },
  "addons": {
    "@glimmer/component": "1.0.0"
  }
}