socket.io 추가

 import express from 'express';
+import socketIo from 'socket.io';
+import { createServer } from 'http';
+
+const PORT = 3000;
 
 const app = express();
-const PORT = 8008;
+const server = createServer(app);
+const io = new socketIo.Server(server);
 
-app.get('/', (req, res) => res.send('Express + TypeScript Server'));
+io.on('connection', socket => {
+  console.log('Connected.');
+})
 
-app.listen(PORT, () => {
-  console.log(`⚡️[server]: Server is running at http://localhost:${PORT}`);
-});
+server.listen(PORT, () => console.log(`Listening on ${PORT}`))

@@ -2,10 +2,12 @@
   "dependencies": {
     "@types/express": "^4.17.11",
     "@types/node": "^15.3.1",
+    "@types/socket.io": "^3.0.2",
+    "express": "^4.17.1",
     "nodemon": "^2.0.7",
+    "socket.io": "^4.1.2",
     "ts-node": "^9.1.1",
-    "typescript": "^4.2.4",
-    "express": "^4.17.1"
+    "typescript": "^4.2.4"
   },
   "scripts": {
     "start": "nodemon index.ts"