diff --git a/.gitignore b/.gitignore
index 4d0cbd3..1f0b399 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,6 +8,7 @@ dist/
 build/
 *.d.ts
 !vite.config.ts
+!server/types/**/*.d.ts
 
 # Ignore compiled JS files but keep source examples
 /server/**/*.js
diff --git a/server/types/y-websocket-utils.d.ts b/server/types/y-websocket-utils.d.ts
new file mode 100644
index 0000000..2352253
--- /dev/null
+++ b/server/types/y-websocket-utils.d.ts
@@ -0,0 +1,15 @@
+declare module 'y-websocket/bin/utils' {
+  import { WebSocket } from 'ws';
+  import { IncomingMessage } from 'http';
+
+  export interface SetupWSConnectionOptions {
+    docName?: string;
+    gc?: boolean;
+  }
+
+  export function setupWSConnection(
+    ws: WebSocket,
+    req: IncomingMessage,
+    options?: SetupWSConnectionOptions
+  ): void;
+}