migrated socket IO initialization to typescript

backend/src/libs/socket.js

@@ -1,14 +0,0 @@
-let io;
-
-module.exports = {
-	init: httpServer => {
-		io = require("socket.io")(httpServer);
-		return io;
-	},
-	getIO: () => {
-		if (!io) {
-			throw new Error("Socket IO not initialized");
-		}
-		return io;
-	},
-};

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;
+};