New Twiddle

application.controller.js

import Ember from 'ember';

export default Ember.Controller.extend({
  value: 1
});

application.template.hbs

{{my-component value=(mut value)}}

my-component.component.js

import Ember from 'ember';

export default Ember.Component.extend({
  didInitAttrs() {
    this.attrs.value.update(this.attrs.value.value + 1);
  },
  didRender() {
    alert("did render with " + this.attrs.value.value);
  }
});

my-component.template.hbs

<div>value is {{attrs.value}}</div>

twiddle.json

{
  "version": "0.4.10",
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/1.13.9/ember.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/1.13.11/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/1.13.9/ember-template-compiler.js"
  }
}