AI solution for React Coding Question on BFE.dev
6. useHover()

Here's a possible implementation of the useHover() hook:

import { useState, useEffect, useRef } from 'react';

function useHover(): [React.RefObject<any>, boolean] {
  const [isHovered, setIsHovered] = useState<boolean>(false);
  const ref = useRef<any>(null);

  const handleMouseOver = (): void => setIsHovered(true);
  const handleMouseOut = (): void => setIsHovered(false);

  useEffect(() => {
    const node = ref.current;
    if (node) {
      node.addEventListener('mouseover', handleMouseOver);
      node.addEventListener('mouseout', handleMouseOut);

      return () => {
        node.removeEventListener('mouseover', handleMouseOver);
        node.removeEventListener('mouseout', handleMouseOut);
      };
    }
  }, [ref.current]);

  return [ref, isHovered];
}

The hook keeps track of whether the element is being hovered over using the isHovered state variable, and updates it in response to the mouseover and mouseout events.

The hook also returns a ref object, which should be passed to the element being tracked for hover state (in this case, the div element in the example usage). The hook takes care of adding and removing the necessary event listeners to the element's DOM node in order to update the hover state.

The App component simply renders the div element with its ref set to the useHover() hook's ref object, and displays the hover state.

Note that this implementation assumes that the element being tracked is a single DOM element, rather than a set of elements. If you need to track hover state across multiple elements, the implementation would need to be modified to handle that case.