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src/lib/auth.config.ts

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+import type { NextAuthConfig } from "next-auth";
+
+export default {
+  pages: {
+    signIn: "/login",
+    error: "/login",
+  },
+  callbacks: {
+    authorized({ auth, request: { nextUrl } }) {
+      const isLoggedIn = !!auth?.user;
+      const isAuthPage =
+        nextUrl.pathname.startsWith("/login") || nextUrl.pathname.startsWith("/register");
+      const isApiAuth = nextUrl.pathname.startsWith("/api/auth");
+      const isHealth = nextUrl.pathname.startsWith("/api/health");
+
+      if (isHealth || isApiAuth) return true;
+      if (isAuthPage) {
+        if (isLoggedIn) return Response.redirect(new URL("/dashboard", nextUrl));
+        return true;
+      }
+      return isLoggedIn;
+    },
+  },
+  providers: [],
+} satisfies NextAuthConfig;