Function handler

pwa/hooks/useIntersection.tsx:13–15

(entries: IntersectionObserverEntry[])

  useEffect(() => {
    if (ref.current && typeof IntersectionObserver === "function") {
      const handler = (entries: IntersectionObserverEntry[]) => {
        setIntersectionObserverEntry(entries[0]);
      };

      const observer = new IntersectionObserver(handler, options);
      observer.observe(ref.current);