How to use the socket.io function in socket

startSocketIoServer() {
		this.io = socketIO(this.webServer);
		this.io.on('connection', (socket) => {
			const connection = new WebRtcConnection(this, socket);
			this.emit('new-connection', connection);
		});
	}
}

constructor() {
    this.app = express();
    this.server = http.createServer(this.app);
    this.io = SocketIO(this.server);
    this.listen();
  }

startSocketIoServer() {
		this.io = socketIO(this.webServer);
		this.io.on('connection', function(socket){
			new Connection(server, socket);
		});
	}

socket(server){
    const io = this.websocket.io = IO(server);
    io.on("connection", socket =>{
      socket.on("disconnect", ()=>{
      });
    });
  }