React 18: Memory Leak implementing useEffect and Event Listeners in Functional Components
I'm performance testing and I need some guidance on I'm prototyping a solution and I'm experiencing a memory leak in my React 18 application when setting up event listeners in a component using the `useEffect` hook... I have a functional component that sets up a global event listener on `window` for `resize` events, and I clean it up in the return function of `useEffect`. However, I'm seeing a warning in the console about potential memory leaks, even though I believe I've followed best practices for cleanup. Here’s the code snippet: ```javascript import React, { useEffect, useState } from 'react'; const MyComponent = () => { const [windowSize, setWindowSize] = useState({ width: window.innerWidth, height: window.innerHeight }); useEffect(() => { const handleResize = () => { setWindowSize({ width: window.innerWidth, height: window.innerHeight }); }; window.addEventListener('resize', handleResize); // Cleanup function return () => { window.removeEventListener('resize', handleResize); }; }, []); return ( <div> <p>Width: {windowSize.width}</p> <p>Height: {windowSize.height}</p> </div> ); }; export default MyComponent; ``` In my application, I am using React 18 with the latest version of React Router. I’ve tried moving the event listener setup to a different hook, but the warning still appears. The console shows a memory leak warning: "Warning: need to perform a React state update on an unmounted component." This happens particularly when I navigate away from the component while resizing the window. What could be causing this scenario, and how can I ensure that my event listeners are properly cleaned up to avoid this warning? Are there specific practices or patterns I should follow when dealing with global event listeners in functional components? I'm using Javascript latest in this project. This is part of a larger web app I'm building. What would be the recommended way to handle this? This is my first time working with Javascript 3.10.