wamr-95.ts

import { Observable, of } from 'rxjs';
import { catchError } from 'rxjs/operators';

observable
  .pipe(
    catchError(err => of(-1))
  )
  .subscribe({
    next: x => console.log(`${x} received`),
    complete: () => console.log('Completed'),
    error: err => console.warn(err)
  });