my 13th reason

src/app/events/Disconnect.ts

@@ -0,0 +1,7 @@
+import { Socket, Server } from "socket.io";
+
+export default function Disconnect(socket: Socket, io: Server) {
+    socket.on('disconnect', (data: any) => {
+        console.log(`---User ${socket.id} has disconnected.`);
+    });
+}