// ❌ LEAK: Keeping DOM reference after unmount
function Component() {
  const elementRef = useRef();

  useEffect(() => {
    window.myGlobalRef = elementRef.current; // Leaked
  }, []);
}

// ✅ CORRECT: Clean up references
function Component() {
  const elementRef = useRef();

  useEffect(() => {
    window.myGlobalRef = elementRef.current;
    return () => delete window.myGlobalRef;
  }, []);
}

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