Set null when server not called.

src/hooks/useAuth.ts

@@ -8,11 +8,11 @@ import { useEffect, useState } from 'react';
  * @returns {boolean | null} isAuth: true if user is authenticated, false otherwise or null if the request has not finished.
  */
 export const useAuth = (): [
-  boolean,
-  React.Dispatch<React.SetStateAction<boolean>>,
+  boolean | null,
+  React.Dispatch<React.SetStateAction<boolean | null>>,
 ] => {
   let isMounted = true;
-  const [isAuth, setIsAuth] = useState<boolean>(false);
+  const [isAuth, setIsAuth] = useState<boolean | null>(null);
   useEffect(() => {
     isAuthenticated().then((state) => {
       if (isMounted) {