platformBrowserDynamic().bootstrapModule(AppModule).then((ngModuleRef: NgModuleRef<AppModule>) => {
  let componentFactoryResolver = ngModuleRef.componentFactoryResolver;
  let componentFactory = ngModuleRef.componentFactoryResolver.resolveComponentFactory(HelloComponent);
  let componentRef = componentFactory.create(ngModuleRef.injector, [], document.querySelector('hello'));
  ngModuleRef.injector.get(ApplicationRef).attachView(componentRef.hostView);
});