socket.io emits multiple times

Question

I have got a very basic example. This question has been asked previously multiple times in stack overflow itself but I could not get the right answer so I am going with this

Answer 1

I didn't read the question, but I'm putting this on here to help the others, cause I hadn't find this kind of answer yet.

In my case, I was calling the function next multiple times, just like so

io.use(async (socket, next) => {
    let req = socket.request
    let res = req.res || {}

    someMiddleware()(req, res, next)
    anotherMiddleware({extended: false})(req, res, next)
    anotherMiddleware()(req, res, next)
    anotherMiddleware(req, res, next)
    anotherMiddleware()(req, res, next)
    anotherMiddleware()(req, res, next)
})

Every time I was calling a middleware, the next function was getting called and on('connection') was being called too. What I got to do was overwrite the next and put it inside the last middleware, so connection get called just once.

. . .
let originalNext = next
next = () => {} // NOW its not going to annoy anymore
someMiddleware()(req, res, next)
anotherMiddleware({extended: false})(req, res, next)
anotherMiddleware()(req, res, next)
anotherMiddleware(req, res, next)
anotherMiddleware()(req, res, next)
anotherMiddleware()(req, res, originalNext) //next get called <
. . .