Watching router broken

config.targets.js

'use strict';

const browsers = [
  'ie 11',
  'last 1 Chrome versions',
  'last 1 Firefox versions',
  'last 1 Safari versions'
];

const isCI = !!process.env.CI;
const isProduction = process.env.EMBER_ENV === 'production';

if (isCI || isProduction) {
  browsers.push('ie 11');
}

module.exports = {
  browsers
};

controllers.application.js

import Ember from 'ember';
import { computed } from '@ember/object';
import { inject as service } from '@ember/service';


export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  router: service(),
  user: computed('router.location.location.href', function() {
    this.router;
    return 'not broken';
  })
});

templates.application.hbs

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

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"
  }
}