add flash message

packages/auth/src/session.ts

@@ -1,7 +1,22 @@
 import { createCookieSessionStorage } from 'react-router'
+import { type User } from './auth'
 
-export function createSessionStorage(env) {
-  const sessionStorage = createCookieSessionStorage({
+type SessionData = {
+  user: User
+  returnTo: string
+}
+
+type SessionFlashData = {
+  error: string
+  success: string
+  info: string
+}
+
+export function createSessionStorage(env: any) {
+  const cookieSessionStorage = createCookieSessionStorage<
+    SessionData,
+    SessionFlashData
+  >({
     cookie: {
       name: '__session',
       httpOnly: true,
@@ -12,6 +27,5 @@ export function createSessionStorage(env) {
       maxAge: 86400 * 7 // 7 days
     }
   })
-
-  return sessionStorage
+  return cookieSessionStorage
 }