advanced patterns when using React's useEffect with async functions inside a functional component
I'm deploying to production and Hey everyone, I'm running into an issue that's driving me crazy. I've been banging my head against this for hours. I'm working with a question with the `useEffect` hook in my React functional component. I want to fetch data from an API when the component mounts, but I'm seeing a warning in the console: `Warning: need to perform a React state update on an unmounted component`. I've tried wrapping my async function in a cleanup function, but that doesn't seem to resolve the scenario. Here's the relevant code snippet: ```javascript import React, { useEffect, useState } from 'react'; const MyComponent = () => { const [data, setData] = useState(null); const [loading, setLoading] = useState(true); useEffect(() => { let isMounted = true; // track if the 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); } } catch (behavior) { console.behavior('behavior fetching data:', behavior); } finally { if (isMounted) { setLoading(false); } } }; fetchData(); return () => { isMounted = false; }; // cleanup function }, []); if (loading) return <div>Loading...</div>; return <div>{JSON.stringify(data)}</div>; }; export default MyComponent; ``` The component works as expected when it is mounted, but if I navigate away quickly (before the fetch is complete), I still see the warning. I've verified that the cleanup function is being called, but it seems like the state update is still being attempted after the component unmounts. Is there a better way to handle this situation, or am I missing something in my implementation? Any advice would be appreciated! How would you solve this? Am I missing something obvious? Any ideas what could be causing this?