twiddle reproduction - concat helper

components.my-component.js

import Ember from 'ember';

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

controllers.application.js

import Ember from 'ember';
import myHelper from 'demo-app/helpers/my-helper';
export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
	first: true,
	second: true
});

helpers.my-helper.js

// TODO: Remove this helper once we move to 1.13
export default Ember.Helper.helper(function(value1, value2) {
  return `${value1}${value2}`;
});

templates.application.hbs

<h1>Concat helper - Twiddle reproduction</h1>
<br>
<br>
<ol>
 <li>Try inspecting Welcome to know the applied classes</li>
 <li>After removing 'my-helper' import in controller/application.js, try inspecting again</li>
</ol>
<hr>
{{my-component class="one" classNames="two" classNameBindings="first:first second:second"}}
{{outlet}}
<br>
<br>

templates.components.my-component.hbs

Welcome
{{yield}}

twiddle.json

{
  "version": "0.10.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "1.13.13",
    "ember-data": "2.6.1",
    "ember-template-compiler": "1.13.13"
  },
  "addons": {}
}