New Twiddle

components.text-area.js

import Ember from 'ember';

export default Ember.Component.extend({
  
  tagName: "textarea",
  
  attributeBindings: ['placeholder'],
  
  input(e) {
		this.get('update')(e.target.value);
  }
  
});

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>

{{#text-area placeholder="Yo" update=(action (mut appName))}}
	{{~appName~}}
{{/text-area}}

<br>
<br>

templates.components.text-area.hbs

{{yield}}

twiddle.json

{
  "version": "0.10.5",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.8.0",
    "ember-data": "2.8.0",
    "ember-template-compiler": "2.8.0",
    "ember-testing": "2.8.0"
  },
  "addons": {}
}