When does it render?

components.index-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  didInsertElement() {
    console.log('index-component didInsertElement');
  }
});

controllers.application.js

import Ember from 'ember';

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

routes.index.js

import Ember from 'ember';

export default Ember.Route.extend({
  activate() {
    console.log('index route activated');
  },
  actions: {
    didTransition: function() {
      console.log('index route didTransition');
      return true; // Bubble the didTransition event
    }
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
<br>
<br>

templates.components.index-component.hbs

{{yield}}

templates.index.hbs

{{log "index template rendered"}}
{{index-component}}

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": {}
}