// ❌ LEAK: Accumulating in global cache
const globalCache = [];

function Component({ data }) {
  useEffect(() => {
    globalCache.push(data); // Never cleared
  }, [data]);
}

// ✅ CORRECT: Clear when unmounting
function Component({ data }) {
  useEffect(() => {
    const index = globalCache.length;
    globalCache.push(data);
    return () => globalCache.splice(index, 1);
  }, [data]);
}

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