Zustand subscribe unsubscribe idempotency and listener cleanup

Store Subscription Lifecycle

Zustand provides a subscribe API that returns an unsubscribe function to manage listener removal. In high-frequency state updates or complex component lifecycles, ensuring that listeners are purged correctly is critical to prevent memory leaks.

Execution Uncertainty

While the API returns a function to stop listening to state changes, the behavior regarding multiple invocations of this returned function is not explicitly detailed in the documentation. There is a need to determine if the unsubscribe mechanism is idempotent or if redundant calls trigger internal state inconsistencies.

• Target Version: Zustand 4.x+
• Mechanism: Internal listener set management

Does calling the unsubscribe function multiple times result in any side effects or errors? Is the unsubscribe process guaranteed to be idempotent across different store configurations?