Add TypeScript types for middleware locals

src/env.d.ts

@@ -1 +1,14 @@
-/// <reference path="../.astro/types.d.ts" />
+/// <reference path="../.astro/types.d.ts" />
+/// <reference types="astro/client" />
+
+declare namespace App {
+    interface Locals {
+        site?: any;
+        siteId?: string;
+        page?: any;
+        post?: any;
+        isAdminRoute?: boolean;
+        isPlatformAdmin?: boolean;
+        scope?: string;
+    }
+}