Hook for manual bootstrapping of the application instead of using bootstrap array in @NgModule annotation. This hook is invoked only when the bootstrap array is empty or not provided.

Reference to the current application is provided as a parameter.

See "Bootstrapping".

The example below uses ApplicationRef.bootstrap() to render the AppComponent on the page.

class AppModule implements DoBootstrap {
  ngDoBootstrap(appRef: ApplicationRef) {
    appRef.bootstrap(AppComponent); // Or some other component
  }
}