auth, trips and join trips

types/next-auth.d.ts

@@ -0,0 +1,18 @@
+import "next-auth";
+
+declare module "next-auth" {
+  interface Session {
+    user: {
+      id: string;
+      name: string;
+      email: string;
+      image?: string | null;
+    };
+  }
+}
+
+declare module "next-auth/jwt" {
+  interface JWT {
+    id: string;
+  }
+}