How to delay an observable in Angular 6 / Typescript

A more detailed example using HttpClient:

of(null).pipe(
  delay(2000),
  flatMap(() => {
    return this.http.post<any>(url, params);
  })
);

you can use delay function

public GetCurrentUserDelayedTest(): Observable<User>
{
    return of(new User(""))
       .pipe(delay(2000));
}