upstream-rocketchat/apps/meteor/client/views/room/hooks/useIsVisible.ts

import { useDebouncedState, useSafely, useSafeRefCallback } from '@rocket.chat/fuselage-hooks';
import { useCallback } from 'react';

export const useIsVisible = () => {
	const [menuVisibility, setMenuVisibility] = useSafely(useDebouncedState(!!window.DISABLE_ANIMATION, 100));

	const callbackRef = useSafeRefCallback(
		useCallback(
			(node: HTMLElement) => {
				const observer = new IntersectionObserver((entries) => {
					entries.forEach((entry) => {
						setMenuVisibility(entry.isIntersecting);
					});
				});

				observer.observe(node);

				return () => {
					observer.disconnect();
				};
			},
			[setMenuVisibility],
		),
	);

	return [callbackRef, menuVisibility] as const;
};