New Twiddle

components.my-button.js

import Ember from 'ember';

export default Ember.Component.extend({
  tagName: 'button',
});

controllers.application.js

import Ember from 'ember';

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

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
{{if showForm 'showForm: true' 'showForm: false'}}
{{my-button (action (mut showForm) true)}}Edit{{/my-button}}
<br>
{{outlet}}
<br>
<br>

templates.components.my-button.hbs

{{yield}}

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"
  }
}