Referencefinalize
Reference · 34
finalize
finalize
Runs a callback on complete, error, or unsubscribe.
Signature
finalize(callback: () => void): MonoTypeOperatorFunctionWhat it does
A guaranteed "finally" for the stream. The callback fires exactly once on any ending: complete, error, or manual unsubscription.
When to use
Hide a loader, release a resource (a port, a file), reset state, send end-of-operation analytics. Pairs with a loading flag: tap(() => loading = true) + finalize(() => loading = false).
Gotcha
finalize gets no access to the value or the error. If you need those, combine it with tap. Also, finalize runs after error/complete, so the subscriber has already been notified.
See also
tap, catchError, takeUntil
script.ts
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