advanced patterns with Async Functions Inside React useEffect Hook When Fetching Data
I need help solving I've searched everywhere and can't find a clear answer. I'm experiencing an scenario when trying to fetch data using an async function within a `useEffect` hook in my React component. The `useEffect` is set to trigger on component mount, but I'm finding that the state is not updating as expected, and I'm getting a console warning: `need to perform a React state update on an unmounted component`. I've tried cleaning up the effect using a flag to avoid updating state after unmounting, but it doesn't seem to resolve the scenario. Here’s a simplified version of my code: ```javascript import React, { useEffect, useState } from 'react'; const DataFetchingComponent = () => { const [data, setData] = useState(null); const [loading, setLoading] = useState(true); useEffect(() => { let isMounted = true; // flag to check if component is mounted const fetchData = async () => { try { const response = await fetch('https://api.example.com/data'); const result = await response.json(); if (isMounted) { setData(result); setLoading(false); } } catch (behavior) { console.behavior('behavior fetching data:', behavior); if (isMounted) { setLoading(false); } } }; fetchData(); return () => { isMounted = false; // cleanup flag }; }, []); return ( <div> {loading ? <p>Loading...</p> : <pre>{JSON.stringify(data, null, 2)}</pre>} </div> ); }; export default DataFetchingComponent; ``` Despite this setup, I still see the warning in the console. I'm using React 17.0.2. I've checked that the API endpoint is valid and returns data correctly when called independently. Is there something I might be overlooking in my useEffect implementation? Or is there a better pattern I should follow? Any guidance would be appreciated! I'm working on a application that needs to handle this. For reference, this is a production CLI tool. What's the best practice here?