@patternfly/react-core/dist/esm/helpers/useUnmountEffect.js

This library provides a set of common React components for use with the PatternFly reference implementation.

import { useEffect, useRef } from 'react';
/**
 * A `useEffect`-like hook that only triggers when a component unmounts. Does not require a dependency list, as the effect callback will always be kept up to date.
 */
export function useUnmountEffect(effect) {
    // Always use the latest effect callback so that it can reference the latest props and state.
    const effectRef = useRef(effect);
    effectRef.current = effect;
    // Trigger the effect callback when the component unmounts.
    useEffect(() => () => {
        effectRef.current();
    }, []);
}
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