New Twiddle

components.my-glimmer-component\.js

import Component from '@glimmer/component';
import { tracked } from '@glimmer/tracking';
import { action } from '@ember/object';

export default class extends Component {
  @tracked updatedTimes = 0;

	get somethingElse(){
  	return `${this.args.something} - ${this.updatedTimes}`;
    
    // this.someVariable
    // this.args.someVariable
    // this.#someVariable
    // this._someVariable
    
  }

  @action
  incrementUpdatedTimes(){
    this.updatedTimes++;
  }

	@action
  init(){
    console.log('init');
  }
}	

components.my-non-glimmer-component\.js

import Component from '@ember/component';

export default Component.extend({
	
})

controllers.application\.js

import Controller from '@ember/controller';
import { action } from '@ember/object';
import { tracked } from '@glimmer/tracking';

export default class ApplicationController extends Controller {
  appName = 'Ember Twiddle';
	@tracked something = 'Controller Attribute';

	@action
	updateParentSomething(){
  	this.something = event.target.value;
  }
}	

templates.application\.hbs

{{my-non-glimmer-component something=this.something}}
<MyGlimmerComponent 
  @something={{this.something}}
  @updateParentSomething={{this.updateParentSomething}}/>
<br><br><br>
<Input @type="text" @value={{this.something}} />

templates.components.my-glimmer-component\.hbs

<div {{did-insert this.init}} {{did-update this.incrementUpdatedTimes @something}}>
  My Glimmer component : {{this.something}}
  <div>Glimmer input
      <input type="text" value={{@something}} {{on "input" @updateParentSomething}}/>
  </div>
  <div>Something was updated {{this.updatedTimes}} times</div>
  <div>Something else : {{this.somethingElse}}</div>
  {{yield}}
</div>

templates.components.my-non-glimmer-component\.hbs

My non-Glimmer component : {{something}}
{{yield}}

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": {
    	"@ember/render-modifiers": "1.0.2",
    "@glimmer/component": "1.0.0"
  }
}