I am runnnig a socketserver in express but I am unable to export the io constant to a different file without it becoming undefined. I, therefore, cannot use io.on( ), it gives a type error. When i tried to console.log it, its undefined. Please help

server.js:

const app = require("express")();
const httpServer = require("http").createServer(app);
const io = require("socket.io")(httpServer, options);
// const io = new Server(server, options)
io.on("connection", socket => { console.log('hello') });

...

module.exports = {httpServer, app, io};

router.js:

const  {io}  = require("../server.js");
// console.log(io)