New Twiddle

components.leak-stuff.js

import Ember from 'ember';

function inspectView(view) {
  return `${view.toString()} (isDestroyed: ${view.isDestroyed})`;
}

export default Ember.Component.extend({
  isExpanded: true,
  
  actions: {
    toggle: function() {
      this.toggleProperty('isExpanded');
      this.rerender(); // bug
    }
  },
  
  __childViews: "",

  didRender() {
    this.set('__childViews', this.childViews.map(inspectView).join('\n'));
  }
});

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>
{{leak-stuff}}
<br>
<br>

templates.components.foo-bar.hbs

foo bar!

templates.components.leak-stuff.hbs

<button {{action "toggle"}}>Toggle</button>

<br>
<br>

{{#if isExpanded}}
  {{foo-bar}}
{{/if}}

<hr>

<h3>childViews</h3>

<pre>{{__childViews}}</pre>

twiddle.json

{
  "version": "0.10.4",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "beta",
    "ember-template-compiler": "beta"
  },
  "addons": {}
}