Argument of type 'NgElementConstructor<unknown>' is not assignable to parameter of type 'CustomElementConstructor'

I'm getting a strange warning in VSCode( 1.44.0-insider ) with Angular9 in creating Angular Elements:

export class AppModule { 
  constructor(private injector: Injector) {
    const helloElement = createCustomElement(HelloComponent, {injector});
    customElements.define('my-hello', helloElement);
  }
  ngDoBootstrap() {}
}

type of helloElement is not accepted with an error message from typescript:

Argument of type 'NgElementConstructor' is not assignable to parameter of type 'CustomElementConstructor'