fix: Swap TS Expect errors with proper type handling in app.d.ts

src/app.d.ts

@@ -1,9 +1,16 @@
 // See https://svelte.dev/docs/kit/types#app.d.ts
 // for information about these interfaces
+
+import { Server as SocketIOServer } from 'socket.io';
+import type { HttpServer } from 'vite';
+
 declare global {
   namespace App {
     // interface Error {}
-    // interface Locals {}
+    interface Locals {
+      io: SocketIOServer | undefined;
+      httpServer: HttpServer | null;
+    }
     // interface PageData {}
     // interface PageState {}
     // interface Platform {}

src/lib/hooks.server.ts

@@ -10,9 +10,7 @@ let io: SocketIOServer | undefined;
 export const handle = (async ({ event, resolve }) => {
   // Initialize WebSocket server if not building
   if (!building) {
-    // @ts-expect-error hides incorrect error
     startupSocketIOServer(event.locals.httpServer);
-    // @ts-expect-error hides incorrect error
     event.locals.io = io;
   }