The template uses require() to load assets from a source .html or .css file. For example:

@Component({
    selector: 'nav-menu',
    template: require('./navmenu.component.html'),
    styles: [require('./navmenu.component.css')]
})

But Angular also allows you to load those assets with a url. In fact, that is the default mechanism when you create an app with angular-cli. It would look like this:

@Component({
    selector: 'nav-menu',
    templateUrl: './navmenu.component.html',
    stylesUrl: ['./navmenu.component.css']
})

But that does not work with this template. It should work because a lot of Angular examples use that and it will lead to a lot of confusion. Also, it makes it difficult to port an app built with angular-cli to use this framework.