chore: fix callback error

src/handlers/callback.js → src/handlers/callback.ts

@@ -1,16 +1,14 @@
 import {config} from '../config/index';
 import RouterClient from '../routerClients/RouterClient';
 
-/**
- *
- * @param {RouterClient} routerClient
- */
-export const callback = async (routerClient) => {
+export const callback = async (routerClient: RouterClient) => {
   const postLoginRedirectURLFromMemory =
     await routerClient.sessionManager.getSessionItem('post_login_redirect_url');
 
   if (postLoginRedirectURLFromMemory) {
-    routerClient.sessionManager.removeSessionItem('post_login_redirect_url');
+    await routerClient.sessionManager.removeSessionItem(
+      'post_login_redirect_url'
+    );
   }
 
   const postLoginRedirectURL = postLoginRedirectURLFromMemory
@@ -25,6 +23,18 @@ export const callback = async (routerClient) => {
     if (config.isDebugMode) {
       console.error('callback', error);
     }
+
+    if (error.message.includes('Expected: State not found')) {
+      return routerClient.json(
+        {
+          error:
+            `Error: State not found.\nTo resolve this error please visit our docs https://docs.kinde.com/developer-tools/sdks/backend/nextjs-sdk/#state-not-found-error` +
+            error.message
+        },
+        {status: 500}
+      );
+    }
+
     return routerClient.json({error: error.message}, {status: 500});
   }
   if (postLoginRedirectURL) {