onChange event demonstartion

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  model: {
    sumText: 'sum text',
  },
  actions: {
    changed() {
      alert('onChange triggered')
    },
    test() {
      console.log('shesh')
      this.set('model.sumText', 'asdasdasdasdqweq')
    }
  },
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
<br>
{{medium-editor
    model.sumText
    options=(hash)
    onChange=(action "changed")
}}

<button onclick={{action "test"}}>External change</button>
<br>

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  },
  "addons": {
    "ember-data": "2.12.1",
    "ember-medium-editor": "0.1.3"
  }
}