Commons Mistakes with React useEffect hook and How to Prevent them.

useEffect is a powerful tool, but you need to use it with a clear understanding of how it works. Otherwise, you could end up in a disappointing situation where some unexpected bugs appear that are really hard to debug. Returning a Promise instead of a function in useEffectThe first mistake I would like to talk about is that useEffect expect you to return undefined or a cleanup function. But if you