Intersection observer not cleaned

Code reviewCode quality & reviewMid–Senior~20 min

Review this React TypeScript infinite-scroll hook.

What a strong answer looks like

Separate real bugs from style. Rank issues by severity, point at the root cause rather than the symptom, and suggest a concrete fix, specific and kind.

0:00 of about 20 min

Mark a line and say what kind of problem it is.0 findings

1function useInfiniteScroll(onReachEnd: () => void) {

2 const ref = useRef<HTMLDivElement>(null);

4 useEffect(() => {

5 if (!ref.current) return;

6 const obs = new IntersectionObserver(([entry]) => {

7 if (entry.isIntersecting) onReachEnd();

8 });

9 obs.observe(ref.current);

10 }, [onReachEnd]);

12 return ref;

13}

Which questions mattered is sealed until you submit. Telling you now would just be handing over the edge cases.