// ❌ LEAK: WebSocket stays open
function Component() {
  useEffect(() => {
    const ws = new WebSocket('wss://api.example.com');
    ws.onmessage = handleMessage;
  }, []);
}

// ✅ CORRECT
function Component() {
  useEffect(() => {
    const ws = new WebSocket('wss://api.example.com');
    ws.onmessage = handleMessage;
    return () => ws.close();
  }, []);
}

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