Why is argument null not asignable to paramenter of type setStateAction in typescript?

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I want to pass empty object as initial state for isAdmin, but it's not assignable.

const Admin = () => {
    const [isAdmin, setIsAdmin] = useState({});

    useEffect(() => {
        const user = getCurrentUser();
        if (user && user.role === 'admin') {
            setIsAdmin(user);
        } else {
            setIsAdmin(null);
        }
    }, []);


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