Tab Example

components.tabs.tab\.js

import Component from '@glimmer/component';
import { schedule } from '@ember/runloop';

export default class extends Component {
  constructor(...argv) {
    super(...argv);
    
    schedule('actions', () => {
      this.args.register(this.args.title);
    });
  }
  
  get isSelected() {
    return this.args.selected === this.args.title;
  }
}

components.tabs\.js

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

export default class extends Component {
  @tracked registeredTabs = [];

  @tracked selected = null;

  @action
  register(title) {
    this.registeredTabs = [ ...this.registeredTabs, title ];
    
    if (!this.selected) {
      this.selected = this.registeredTabs[0];
    }
  }
}

controllers.application\.js

import Controller from '@ember/controller';

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

templates.application\.hbs

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

<Tabs as |Tab|>
  <Tab.Pane @title="Tab 1">
    Content 1
  </Tab.Pane>
  <Tab.Pane @title="Tab 2">
    Content 2
  </Tab.Pane>
  <Tab.Pane @title="Tab 3">
    Content 3
  </Tab.Pane>
</Tabs>

templates.components.tabs.tab\.hbs

{{#if this.isSelected}}
  <div class="panel">
		{{yield}}
  </div>
{{/if}}

templates.components.tabs\.hbs

<div class='tab-component'>
  <div class='tabs'>
    {{#each this.registeredTabs as |tab|}}
      <button class='tab' {{on "click" (action (mut this.selected) tab)}}>
      	{{tab}}
      </button>
    {{/each}}
  </div>
  {{yield
    (hash
      Pane=(component "tabs/tab" register=this.register selected=this.selected)
    )
  }}
</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"
  }
}