Recursive rxjs mergeMap

rec-mergeMap.ts

function repeat(n: number): Observable<number> {
  return of(n).pipe(
    mergeMap(o => of(o).pipe(
      merge(repeat(n+1))
    ))
  );
}

repeat(0).subscribe(n => console.log('Got me a number', n), e => console.error(e), () => console.log('All done'));

This totally stack overflows