Can you tell when share() completes/unsubscribes?

[raymonddavis]

The share() pipe completes when the last subscriber unsubscribes. Is there a way to be notified or run a function when the share unsubscribes?

[cartant]

You can use the finalize operator to run a function when the source completes, errors or is explicitly unsubscribed:

const shared = source.pipe(
   finalize(() => { /* whatever */ }),
   share()
);