New Twiddle

components.card-view-model\.js

import Component from '@glimmer/component';

export default class extends Component {
  get title() {
    return this.args.model.title;
  }
  
  get content() {
    return this.args.model.content;
  }
}

components.card\.js

import Component from '@glimmer/component';

export default class extends Component {
}

controllers.application\.js

import Controller from '@ember/controller';

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

routes.application\.js

import Route from '@ember/routing/route';

export default Route.extend({
  model() {
    return {
      title: 'Hello!',
      content: 'Content is neat.',
    }; 
  }
});

styles.app\.css

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

.card {
  border: 1px solid gray;
  border-radius: 5px;
  padding: 24px;
}

.card__title {
  margin: 0 0 24px;
}

templates.application\.hbs

<h1>Simple Card View Model</h1>

<CardViewModel @model={{this.model}} />

templates.components.card-view-model\.hbs

{{!-- 
	@title should using a named block
  but Twiddle's version of Ember does not support this
--}}
<Card @title={{this.title}}>
	{{this.content}}
</Card>

templates.components.card\.hbs

<div class="card">
	<h2 class="card__title">
    {{@title}}
  </h2>
  
	{{yield}}
</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"
  }
}