Variable type not certain according to TypeScript

See the following custom hook. It simply sets a state value to true and back to false after 2 seconds.

export const useDelay = () => {    const [loading, setIsLoading] = useState(false);    const timer = useRef(null);    const runDelay = () => {        setIsLoading(true);        timer.current = setTimeout(() => {            setIsLoading(false);        }, 2000);    }    return [loading, runDelay];}

However, when importing this hook TypeScript thinks the loading value, which is clearly a boolean can also be of type () => void (The type of runDelay). How is this possible?

const [loading, runDelay] = useDelay();// const loading: boolean | (() => void)

I know it's best practice to cleanup the timer in useEffect cleanup function, wip hook :)