rxjs migration, return of pipe()

[Gamewalker]

Hello,

with rxjs 6 the following code was working fine, with rxjs7 (or probably TS 4.2) its not workign anymore. I dont really understand whats happening here and find no clue in the migration guide.

TS2322: Type 'Observable<unknown>' is not assignable to type 'Observable<T>'.   Type 'unknown' is not assignable to type 'T'.     'T' could be instantiated with an arbitrary type which could be unrelated to 'unknown'.

  public post<T, V>(endpoint: string, body?: V): Observable<T> {
    return this.http.post<T>(this.api + endpoint, body, ApiService.getHttpOptions()).pipe(this.errorHandling);
  }

  errorHandling = catchError((err: HttpErrorResponse) => {
    this.loggingService.error('--------- API ERROR ---------', err.message, '------- API ERROR ENDE ------');

    ....

    return EMPTY;
  });

[raymonddavis]

So I am not sure what caused the change but if errorHandling is a variable then it will not be able to get the correct type information from the place it is being used.

public errorHandling<T>(): OperatorFunction<T, T> {
    return catchError((err: any) => {
      this.loggingService.error('--------- API ERROR ---------', err.message, '------- API ERROR ENDE ------');

      ....

      return EMPTY;
    });
  }

If you make that variable into a function that takes the generics you can handle the typing.

The stackblitz is here
https://stackblitz.com/edit/rxjs-pipe-issue