Handling Promises with React's Concurrent Mode: Unexpected State Updates on Re-renders
I need some guidance on I've looked through the documentation and I'm still confused about I'm currently migrating a React application to use Concurrent Mode, and I've encountered an scenario with state updates when handling promises... My component fetches data from an API when it mounts, but I'm seeing unexpected behavior where the state updates are being applied to stale data on re-renders. I've tried using `useEffect` with a dependency array, but it seems that the component is getting re-rendered multiple times before the promise resolves. Here’s a simplified version of my component: ```javascript import React, { useEffect, useState } from 'react'; const MyComponent = () => { const [data, setData] = useState(null); const [loading, setLoading] = useState(true); useEffect(() => { const fetchData = async () => { const response = await fetch('https://api.example.com/data'); const result = await response.json(); setData(result); setLoading(false); }; fetchData(); }, []); if (loading) return <div>Loading...</div>; return <div>{JSON.stringify(data)}</div>; }; export default MyComponent; ``` After switching to Concurrent Mode, I'm noticing that the `setData` call sometimes has no effect, and the component renders with outdated information. I’ve also added a console log inside the `fetchData` function to check when it gets called, but it seems that `setData` is being called after the component has already rendered with the previous state. I've checked the React documentation and looked into potential issues with async state updates, but I still need to figure out how to ensure the state is always in sync with the latest promise resolution. Is there a recommended way to handle promises in components using Concurrent Mode? Maybe I need to use a ref or some other technique to avoid stale closures? Any insights would be greatly appreciated! My development environment is macOS. I'm working on a CLI tool that needs to handle this. I'd love to hear your thoughts on this. I'm working on a CLI tool that needs to handle this. Any feedback is welcome!