I CAN HAZ BLOCK?

components.my-component.js

import Ember from 'ember';

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

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>
<h3>Angle w/o block</h3>
<MyComponent />
<br>
<br>
<h3>Angle w/ block</h3>
<MyComponent></MyComponent>
<br>
<br>

templates.components.my-component.hbs

<code>hasBlock</code><br>

{{#if hasBlock}}
block
{{else}}
no block
{{/if}}

<br><br>

<code>has-block</code><br>
{{#if has-block}}
block
{{else}}
no block
{{/if}}

<br><br>

<code>(has-block)</code><br>
{{#if (has-block)}}
block
{{else}}
no block
{{/if}}

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.4.3",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3"
  },
  "addons": {
    "ember-data": "3.4.2"
  }
}