@react-hookz/web/dist/useIsMounted/index.js

React hooks done right, for browser and SSR.

import { useCallback, useEffect, useRef } from 'react';
/**
 * Returns a function that returns the current mount state. This hook is useful when you have to
 * detect component mount state within async effects.
 *
 * @param initialValue Initial value.
 *
 * @return Function that returns `true` only if the component is mounted.
 */
export function useIsMounted(initialValue = false) {
    const isMounted = useRef(initialValue);
    const get = useCallback(() => isMounted.current, []);
    useEffect(() => {
        isMounted.current = true;
        return () => {
            isMounted.current = false;
        };
    }, []);
    return get;
}