Function isSelfCompletingSubscribe

Returns true when the observable chain feeding a .subscribe() call is piped through an operator that completes it (takeUntil, takeUntilDestroyed, take, first).

Part of the shared subscription leak heuristics used by architecture:rxjs-memory-leak and angular:performance-violation (plugin-angular), so both rules agree on which subscriptions are safe:

• .pipe(takeUntil(...)), .pipe(takeUntilDestroyed(...))
• .pipe(take(<n>)), .pipe(first(...)) (complete on their own)
• toSignal(...), firstValueFrom(...), lastValueFrom(...) are not .subscribe() calls and therefore never reported
• class-level cleanup via DestroyRef.onDestroy(...) (hasDestroyRefCleanup)