New Twiddle

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  options: [{name: 'one'}, {name: 'two'}, {name: 'three' }, {name: 'four' }],
  selected: null,
  searchThings() {
    // perform search
  },
  preventDeletion(_, e) {
    if (e.keyCode === 8 && e.target.value === "") {
    	return false;
    }
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{#power-select-multiple options=options selected=selected onchange=(action (mut selected)) onkeydown=preventDeletion search=searchThings as |opt|}}
  {{opt.name}}
{{/power-select-multiple}}
Thing
<br>
<br>
<div id="ember-basic-dropdown-wormhole"></div>

twiddle.json

{
  "version": "0.13.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.16.2",
    "ember-template-compiler": "2.16.2",
    "ember-testing": "2.16.2"
  },
  "addons": {
    "ember-data": "2.16.3",
    "ember-power-select":"2.0.0"
  }
}