Hi there! i am using SSR mode, and i was wondering how to initialize web socket server on my server. i have modified extension.js as below:

module.exports.extendApp = function ({app, ssr}) {
    const server = http.createServer(app)
    const io = socketIO(server)


    io.on('connection', (socket) => {
     //... 
    }
}

which does not work, it only works if i add this line to extension.js:

server.listen(3000)

but this is a bad idea, because anytime i made changes to this file, my dev server crashes and it is normal behaviour.

what do you guys suggest?
thanks!