migrated socket IO initialization to typescript

backend/src/libs/socket.ts

@@ -0,0 +1,15 @@
+import socketIo, { Server as SocketIO } from "socket.io";
+import { Server } from "http";
+
+let io: SocketIO;
+
+export const initIO = (httpServer: Server): SocketIO => {
+  io = socketIo(httpServer);
+  return io;
+};
+export const getIO = (): SocketIO => {
+  if (!io) {
+    throw new Error("Socket IO not initialized");
+  }
+  return io;
+};