An empty dependency array means that the effect runs only once on mount. Same with memos and callbacks -- the value should remain stable. Here's a real world example of how I populate some state based on url query params:

https://github.com/Naught0/combinator/blob/master/frontend/s...

I may end up using a more robust routing solution to keep in sync with query params if I ever want to spend the effort, but this is a naive solution that works alright.

A more simplified, generic example could be:

  const [foo, setFoo] = useState();
  useEffect(() => {
    setFoo("bar");
  }, []); // The eslint rule wants setFoo here despite the value being stable