feat: add TypeScript definitions for next-auth session with accessToken and user details

_archive/frontend/lib/with-auth.ts

@@ -0,0 +1,49 @@
+/**
+ * Hjälpfunktion för att wrappa Next.js Route Handlers med NextAuth auth().
+ * Löser problemet med att auth() standalone inte fungerar i route handlers
+ * med Next.js 15+/16 (async cookies-kompatibilitet i NextAuth beta).
+ *
+ * request.auth = session-objektet (inkl. accessToken)
+ */
+import { NextResponse } from 'next/server';
+import { auth } from '../auth';
+
+export type AuthedRequest = Request & { auth: { accessToken?: string; user?: any } | null };
+
+/**
+ * Returnerar Authorization-headern från en autentiserad request.
+ * Kastar 401-svar om sessionen saknar accessToken.
+ */
+export function getBearer(session: AuthedRequest['auth']): string | null {
+  if (!session?.accessToken) return null;
+  return `Bearer ${session.accessToken}`;
+}
+
+/**
+ * Wrapper: export const GET = withAuth(async (req, session, context) => { ... })
+ */
+export function withAuth(
+  handler: (req: Request, session: NonNullable<AuthedRequest['auth']>, context: any) => Promise<Response>,
+) {
+  return auth(async function (request: any, context: any) {
+    let session = request.auth;
+    // eslint-disable-next-line no-console
+    console.log('[withAuth] request.auth:', JSON.stringify(session));
+
+    // Fallback: om wrapper-formen inte populerar request.auth, försök standalone
+    if (!session?.accessToken) {
+      // eslint-disable-next-line no-console
+      console.log('[withAuth] Trying auth() standalone fallback...');
+      session = await auth();
+      // eslint-disable-next-line no-console
+      console.log('[withAuth] standalone session:', JSON.stringify(session));
+    }
+
+    if (!session?.accessToken) {
+      // eslint-disable-next-line no-console
+      console.warn('[withAuth] No accessToken — returning 401');
+      return NextResponse.json({ message: 'Unauthorized' }, { status: 401 });
+    }
+    return handler(request, session, context);
+  });
+}