Code reviewHardcr-g391

Subject Memory leak listenersLevel Mid–Senior~20 minCommon in Code quality & review interviewsIndustries Software development

Question

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.

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Code to reviewtsx

1function useInfiniteScroll(onReachEnd: () => void) {2  const ref = useRef<HTMLDivElement>(null);3 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]);11 12  return ref;13}

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