classic component modifiers

components.classic-component\.js

import Component from '@ember/component';

export default Component.extend({
  classNames: ['component-box'],
})

components.glimmer-component\.js

import Component from '@glimmer/component';

export default class extends Component {
}

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
  clicked = 0;
  @tracked
  lastElClickedClasses = '(null)';

  @action
	didClick({target}) {
    this.lastElClickedClasses = target.getAttribute('class');
    this.clicked++;
  }
}

styles.app\.css

body {
  margin: 12px 16px;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-size: 12pt;
}

.component-box {
  width: 100px;
  height: 100px;
  border: 1px solid;
  background: rgba(0,0,0,0.2);
  padding: 0.5rem;
  border-radius: 0.5rem;
  display: inline-block;
}

[data-attribute] {
  color: fuchsia;
}
  

templates.application\.hbs

<ClassicComponent
  {{on 'click' this.didClick}}
  data-attribute="true"
/>

<GlimmerComponent
  {{on 'click' this.didClick}}
  data-attribute="true"
/>

<p>{{this.lastElClickedClasses}} clicked, {{this.clicked}} total clicks</p>

templates.components.classic-component\.hbs

<p class="classic-component-p">classic component</p>
<button class="classic-component-button">button</button>

templates.components.glimmer-component\.hbs

<div class="component-box glimmer-component">
  <p class="glimmer-component-p">glimmer component</p>

  
  <button ...attributes class="glimmer-component-button">
    button
  </button>
</div>

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"
  }
}