Real-life: timeout({ with }) fallback

If the source stays silent, timeout should switch to a fallback Observable.

1. Solve the task in the editor — no long theory.
2. Run the check and compare your output with the expected result.
3. Stuck? Open the solution and carry the approach into your own code.

const { NEVER, of, timeout } = Rx;

const result$ = NEVER.pipe(
  timeout({ first: 5, with: () => of('fallback') })
);

result$.subscribe(value => console.log(value));