socketio_typed_rooms_join_and_broadcast_server.ts

1import { Server } from "socket.io";
2import { createServer } from "http";
3
4const httpServer = createServer();
5const io = new Server(httpServer, {
6  // options
7});
8
9interface ServerToClientEvents {
10  noArg: () => void;
11  basicEmit: (a: number, b: string, c: Buffer) => void;
12  withAck: (d: string, callback: (e: number) => void) => void;
13  "room-message": (msg: string) => void;
14}
15
16interface ClientToServerEvents {
17  hello: () => void;
18  "join-room": (roomName: string) => void;
19  "send-to-room": (roomName: string, message: string) => void;
20}
21
22interface InterServerEvents {
23  ping: () => void;
24}
25
26interface SocketData {
27  name: string;
28  age: number;
29}
30
31const ioTyped = new Server<
32  ClientToServerEvents,
33  ServerToClientEvents,
34  InterServerEvents,
35  SocketData
36>(httpServer);
37
38ioTyped.on("connection", (socket) => {
39  // Join a room
40  socket.on("join-room", (roomName) => {
41    socket.join(roomName);
42    console.log(`Socket ${socket.id} joined room ${roomName}`);
43  });
44
45  // Send message to a specific room
46  socket.on("send-to-room", (roomName, message) => {
47    ioTyped.to(roomName).emit("room-message", message);
48  });
49});
50
51httpServer.listen(3000);