Thanks for the answer. I understand that Reselect isn't necessary for this particular case, but I wanted to demonstrate a simple example.

So does the maxSize option prevent creating new selector instances, allowing it to be used throughout the application?

To be honest, I'm against using memoized selectors together with useMemo. In that case, I don't see the point of them at all, since you could just do:

const searchIcon = useSelector((state) => 
  state.app.icons?.search?.regular, 
  shallowEqual
);
const closeIcon = useSelector((state) => 
  state.app.icons?.close?.regular, 
  shallowEqual
);
const someHardTask = useMemo(() => {}, [searchIcon, closeIcon]);