crm-api-template-generator/backend/utils/socketIO.js

const SocketIO = require('socket.io') 
let io

const initIO = (httpServer) => {
    io = SocketIO(httpServer, {
        cors: {
            origin: process.env.URL_OAUTH_FRONTEND_SUCCESS_REDIRECT
        },
        maxHttpBufferSize: 1e8
    })

    io.on("connection", socket => { 
        console.log('CLIENT CONNECTED')

        socket.on("companySession", (companyId) => {
            console.log(`A client joined a companySession channel: ${companyId}`)
            socket.join(`company_${companyId}`)
        });   

        socket.on("disconnect", (data) => {
            console.log(`Client disconnected socket: ${data}`)
        }) 
    })
    return io
}

const getIO = () => {
    if (!io) {
        throw new AppError("Socket IO not initialized")
    }
    return io
}

module.exports = { initIO, getIO }