Memory Leak in React Function Component with useEffect and Cleanup
I'm working on a project and hit a roadblock. I'm having trouble with I'm experiencing a memory leak in my React application that uses function components with hooks... I have a component that fetches data and sets it in the state using `useEffect`, but it seems like the previous fetch requests are still being processed even after the component unmounts. The warning I'm seeing in the console is: ``` Warning: Can't perform a React state update on an unmounted component. ``` Here's what the code looks like: ```javascript import React, { useEffect, useState } from 'react'; const DataFetcher = () => { const [data, setData] = useState(null); const [loading, setLoading] = useState(true); useEffect(() => { let isMounted = true; // flag to track if component is mounted const fetchData = async () => { const response = await fetch('https://api.example.com/data'); const result = await response.json(); if (isMounted) { setData(result); setLoading(false); } }; fetchData(); return () => { isMounted = false; // cleanup function sets the flag to false }; }, []); if (loading) return <div>Loading...</div>; return <div>{JSON.stringify(data)}</div>; }; export default DataFetcher; ``` I thought using the `isMounted` flag in the cleanup function would prevent the state update, but I'm still getting the warning. I've double-checked to ensure that the function is indeed unmounted before the state updates happen. Am I missing something with the cleanup process or the way I'm managing state updates? Any insights would be appreciated! How would you solve this? My team is using Javascript for this mobile app. I'd love to hear your thoughts on this. I'm on Windows 11 using the latest version of Javascript. Any ideas what could be causing this?