Block Components

components.final-leaf.js

import Ember from 'ember';

export default Ember.Component.extend({
  click() {
    this.show();
  }
});

components.mid-level.js

import Ember from 'ember';

export default Ember.Component.extend({
});

components.some-button.js

import Ember from 'ember';

export default Ember.Component.extend({
});

components.top-level.js

import Ember from 'ember';

export default Ember.Component.extend({
  actions: {
    show() {
      alert('Top level!');
    }
  }
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
{{#top-level as |actions|}}
	{{#mid-level}}
  	{{final-leaf showMe=true show=actions.show}}
    <div>
    	Plus I can add custom markup in here in a compositional style.
    </div>
    <div>
    	Or add other components:
    </div>
    {{some-button text='Foo'}}
  {{/mid-level}}
{{/top-level}}
<br>
<br>

templates.components.final-leaf.hbs

Final leaf
{{yield}}

{{#if showMe}}
	<div>
  	I'm here!
  </div>
{{/if}}

templates.components.mid-level.hbs

Mid level
{{yield}}

templates.components.some-button.hbs

<button>{{text}}</button>
{{yield}}

templates.components.top-level.hbs

Top level
{{yield
	(hash show=(action 'show'))
}}

twiddle.json

{
  "version": "0.14.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "2.18.2",
    "ember-template-compiler": "2.18.2",
    "ember-testing": "2.18.2"
  },
  "addons": {
    "ember-data": "2.18.2"
  }
}