New Twiddle

application.controller.js

import Ember from 'ember';

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

application.template.hbs

{{input type="checkbox" name="isJavascript" checked=isJavascript}}

{{#code-component isJavascript=isJavascript}}
  {{#if isJavascript}}
     [[[script type="javascript"]]]
  	   <b>js</b>
     [[[/script]]]
  {{else}}
    <b>hello</b>
  {{/if}}
{{/code-component}}

code-component.component.js

import Ember from 'ember';

export default Ember.Component.extend({
  didReceiveAttrs: function() {
    console.log('didReceiveAttrs')
  }
});

code-component.template.hbs

{{#hidden-code-component}}
  {{yield}}
{{/hidden-code-component}}

{{highlighted-code-component isJavascript=isJavascript}}

hidden-code-component.component.js

import Ember from 'ember';

export default Ember.Component.extend({
  classNames: ['hidden-code-component']
});

hidden-code-component.template.hbs

{{yield}}

highlighted-code-component.component.js

import Ember from 'ember';

export default Ember.Component.extend({
  didRender() {
    console.log('didReceiveAttrs highlighted');
    let hiddenComponent = Ember.$('.hidden-code-component');
    let html = hiddenComponent.html();
    
    html = html.replace(/\[\[\[/g, '<');
   	html = html.replace(/\]\]\]/g, '>');
    console.log('html', html);
    
    this.$('.highlighted').text(html);
  }
});

highlighted-code-component.template.hbs

<div class="highlighted"></div>

twiddle.json

{
  "version": "0.6.5",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.4.3/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.4.0/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.4.3/ember-template-compiler.js"
  }
}