the interceptor in your example is deprecated

[kinizumi]

instead of class, angular is now moving on to use const for interceptor
the way you mentioning is no longer valid, we'll have to implement the refresh with the new format, e.g.:
export const authInterceptor = (req: HttpRequest, next: HttpHandlerFn): Observable<HttpEvent> => {
return next(newReq).pipe(
catchError((error) => {
// Catch "401 Unauthorized" responses
if (error instanceof HttpErrorResponse && error.status === 401) {
// mergemap refreshtoken call
}
return throwError(error);
}),
);
any idea please?