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components.bar-baz\.hbs

<bar ...attributes> </bar>

components.foo-bar\.hbs

<div ...attributes>
	<BarBaz />
</div>

controllers.application\.js

import Controller from '@ember/controller';

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

modifiers.foo\.js

import Modifier from 'ember-modifier';

export default class ObserveImpressionsModifier extends Modifier {
  didInstall() {
    debugger
  }
  
  async didReceiveArguments() {

  }

  willRemove() {
  }
}

templates.application\.hbs

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

twiddle\.json

{
  "version": "0.17.1",
  "EmberENV": {
    "FEATURES": {},
    "_TEMPLATE_ONLY_GLIMMER_COMPONENTS": false,
    "_APPLICATION_TEMPLATE_WRAPPER": true
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "ember": "3.18.1",
    "ember-template-compiler": "3.18.1",
    "ember-testing": "3.18.1",
    "ember-modifier": "2.1.1"
  },
  "addons": {
    "@glimmer/component": "1.0.0",
    "ember-modifier": "2.1.1"
  }
}