Slow Route

components.custom-img\.js

import Component from '@ember/component';

export default class extends Component {
  didUpdateAttrs() {
  }
}

controllers.application\.js

import Controller from '@ember/controller';

export default class ApplicationController extends Controller {
  appName = 'Ember Twiddle';
}

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('foo');
});

export default Router;

routes.foo\.js

import Route from '@ember/routing/route';

export default class FooRoute extends Route {
  model() {
    return new Promise((resolve) => setTimeout(resolve, 2000));
  }
  
  afterModel() {
  	console.log('slow model resolved')
	}
}

routes.index\.js

import Route from '@ember/routing/route';

export default Route.extend({
});

templates.application\.hbs

<h1>Demo</h1>

<LinkTo @route="index">Home</LinkTo>
<LinkTo @route="foo">Slow Route</LinkTo>

<p>Start on the home route and then go to the Slow Route. The Slow Route has a model hook that takes a second to resolve.</p>

{{outlet}}

templates.components.custom-img\.hbs

<img src={{@src}}>

templates.foo\.hbs

<h2>Foo Route</h2>

<CustomImg @src="http://placekitten.com/400/500" />

templates.index\.hbs

<h2>Index Route</h2>

<CustomImg @src="http://placekitten.com/200/300" />

twiddle\.json

{
  "version": "0.17.1",
  "EmberENV": {
    "FEATURES": {},
    "_TEMPLATE_ONLY_GLIMMER_COMPONENTS": false,
    "_APPLICATION_TEMPLATE_WRAPPER": true,
    "_JQUERY_INTEGRATION": true
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.js",
    "ember": "3.18.1",
    "ember-template-compiler": "3.18.1",
    "ember-testing": "3.18.1"
  },
  "addons": {
    "@glimmer/component": "1.0.0"
  }
}