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Editing: sticky-sentinel.ts
import {useCallback, useRef, useState} from 'react'; export function useStickySentinel() { const [isSticky, setIsSticky] = useState(false); const observerRef = useRef<IntersectionObserver>(); const sentinelRef = useCallback((sentinel: HTMLDivElement | null) => { if (sentinel) { const observer = new IntersectionObserver( ([e]) => setIsSticky(e.intersectionRatio < 1), {threshold: [1]} ); observerRef.current = observer; observer.observe(sentinel); } else if (observerRef.current) { observerRef.current?.disconnect(); } }, []); return {isSticky, sentinelRef}; }
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