Join room in another namespace in socket.io

I have this code bellow and it works great in socket.io version 1.3.7

this.gameInfra = io.of('/game_infra');
this.gameInfra.on('connection', (socket) => {

    socket.on('join_room', (room) => {
            var comSocket = self.chatCom.connected[socket.id];
            comSocket.join(room.name);
            comSocket.room = room.name;
     });
)};

this.chatCom = io.of('/chat_com');
this.chatCom.on('connection', (socket) => {
    socket.on('message', (message) => {
            message.username = self.gameInfra.connected[socket.id].username;
            socket.in(socket.room).broadcast.send(JSON.stringify(message));
    });
});

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I want to upgrade my socket.io to the latest version but this code

var comSocket = self.chatCom.connected[socket.id]; 

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is undefined in newer versions.

Anyone who nows the new syntax?