I can second this... I inherited a huge pile of crap without a react lint ruleset and as soon as I put it in place there were ton of errors.
The part I don't like about useEffect is that developers tend to overuse it and when they get stuck in infinite render loops you can see the whole mess it can lead to and how hard it can be to untangle monkey patched logic.
The part I don't like about useEffect is that developers tend to overuse it and when they get stuck in infinite render loops you can see the whole mess it can lead to and how hard it can be to untangle monkey patched logic.