Tracking error page

controllers.application.js

import Ember from 'ember';

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

controllers.error.js

import Ember from 'ember';

export default Ember.Controller.extend({
  foo: true
});

router.js

import EmberRouter from '@ember/routing/router';
import config from './config/environment';

const Router = EmberRouter.extend({
  location: 'none',
  rootURL: config.rootURL
});

Router.map(function() {
  this.route('error');
});

export default Router;

routes.application.js

import Ember from 'ember';
import { inject as service } from '@ember/service';
import { scheduleOnce } from '@ember/runloop';

export default Ember.Route.extend({
  router: service(),
  
  _trackPage(page = document.location.pathname, routePath = this.router.currentRouteName || 'unknown') {
    console.log('_trackPage', page, routePath);
  },
  
  actions: {
    willTransition() {
    	console.log('willTransition', arguments);
    },
    didTransition() {
    	this._super(...arguments);
      scheduleOnce('afterRender', this, '_trackPage');
      console.log('didTransition', arguments);
    },
  	error(error, transition) {
      console.log('error', transition, this);
      this.controllerFor('error').set('model', error);
      this.transitionTo('error');
      
    	return true;
    }
  }
});

routes.error.js

import Ember from 'ember';

export default Ember.Route.extend({
  model() {
  	console.log('error route');
  }
});

routes.index.js

import Ember from 'ember';

export default Ember.Route.extend({
  beforeModel() {
  	throw new Error('application route beforeModel');
  }
});

templates.application.hbs

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

templates.error.hbs

Error substate

{{model}}

{{foo}}

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.4.3",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3"
  },
  "addons": {
    "ember-data": "3.4.2"
  }
}