useUnmount hook

Run a callback when the component unmounts. Use for cleanup and teardown.

import { useEffect } from 'react';

export function useUnmount(fn: () => void): void {
  useEffect(() => {
    return fn;
  }, []);
}

How to use

Runs the callback when the component unmounts. Use for cleanup: cancel subscriptions, abort requests, clear timers.

Return cleanup from the effect; useUnmount keeps the API explicit.

useUnmount(() => { subscription.unsubscribe(); });