Strange Behavior with useEffect Cleanup Function Not Firing in React 18 on Component Unmount
I'm learning this framework and I'm trying to implement I'm stuck on something that should probably be simple. I'm following best practices but I'm working with an scenario where the cleanup function in my `useEffect` hook is not firing when the component unmounts. I'm using React 18 and my component looks something like this: ```javascript import React, { useEffect, useState } from 'react'; const MyComponent = () => { const [data, setData] = useState(null); useEffect(() => { const fetchData = async () => { const response = await fetch('https://api.example.com/data'); const result = await response.json(); setData(result); }; fetchData(); return () => { console.log('Cleanup function called'); setData(null); // Resetting state on unmount }; }, []); return <div>{data ? JSON.stringify(data) : 'Loading...'}</div>; }; export default MyComponent; ``` The component fetches data from an API and resets the state in the cleanup function. However, I noticed that the cleanup function does not get triggered when I navigate away from this component. I even added a console log within the cleanup, but I only see it when I refresh the page, not when I unmount it by navigating to another route. I've already tried: - Making sure there are no errors in the console that may be preventing the cleanup from executing. - Testing with different dependencies in the `useEffect` array (like `data`), but it still doesn’t trigger on unmount. Am I missing something in how React 18 handles unmounting, or is there a specific way to ensure the cleanup function runs properly? Also, I'm using React Router for navigation. Any help would be greatly appreciated! I'm working with Javascript in a Docker container on Windows 11. Am I missing something obvious? I'm working on a desktop app that needs to handle this. I'd be grateful for any help. I'm working with Javascript in a Docker container on Ubuntu 20.04. What are your experiences with this?