add: authentication WIP

types/next-auth.d.ts

@@ -2,13 +2,13 @@ import NextAuth, { DefaultSession, DefaultJWT, DefaultUser } from "next-auth";
 import { JWT } from "next-auth/jwt";
 
 declare module "next-auth" {
-    interface Session extends Omit<DefaultSession, 'user'> {
+    interface Session {
         user: {
             id: number;
             firstName: string;
             lastName: string
             isTeacher: boolean;
-        };
+        } & DefaultSession["user"];
     }
     interface User {
         id: number;