Snippet from my angular session

main.ts

async function bootstrap() {
  const config = await fetch('http://localhost:3000/config').then( res => res.json() );

  // You can provide static providers to the created platform
  const browserPlatform = platformBrowserDynamic([
    { provide: ConsoleLogger }
  ]);

  // After bootstrapping your module you can use thק appModuleRef to configure
  // The module injector, and get access to this module components
  // example: `const applicationRef = appModuleRef.injector.get<ApplicationRef>(ApplicationRef);`
  const appModuleRef: NgModuleRef<AppModule> = await browserPlatform.bootstrapModule(AppModule);

  // It is possible to bootstrap modules depend on certain condition
  if(config.alerts) {
   await browserPlatform.bootstrapModule(AlertModule, {
     ngZone: 'noop'
   });
  }
}

bootstrap();