/**
* Copyright (c) 2000-present Liferay, Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by the Free
* Software Foundation; either version 2.1 of the License, or (at your option)
* any later version.
*
* This library is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
* details.
*/
import {useCallback, useLayoutEffect, useRef} from 'react';
/**
* Hook for determining whether a component is still mounted.
*
* Use this to guard side-effects of asynchronous operations (fetches,
* promises) that may complete after a component has been unmounted.
*
* Example:
*
* const isMounted = useIsMounted();
* const [value, setHidden] = useHidden(true);
*
* setTimeout(() => {
* if (isMounted()) {
* setHidden(true);
* }
* }, 1000);
*
*/
export default function useIsMounted() {
const mountedRef = useRef(false);
const isMounted = useCallback(() => mountedRef.current, []);
useLayoutEffect(() => {
mountedRef.current = true;
return () => {
mountedRef.current = false;
};
}, []);
return isMounted;
}