export function interceptor(request: HttpRequest<unknown>, next: HttpHandlerFn): Promise<HttpEvent<unknown>> {
  // before api logic

  return next(request).then(result => {
      // tap logic
  }).catch((requestError: HttpErrorResponse) => {
      // error logic
  });
}

export function interceptor(request: HttpRequest<unknown>, next: HttpHandlerFn): Observable<HttpEvent<unknown>> {
  // before api logic

  return next(request).pipe(
    tap(result => {
      // tap logic
    }),
    catchError((requestError: HttpErrorResponse) => {
      // error logic
      return throwError(() => requestError);
    })
  );
}