node.js: importing socket.io with es6 [duplicate] - node.js

Question

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Pass options to ES6 module imports
(9 answers)
Closed 4 years ago.
I am writing a sample code to handle socket connections in node.js using es6 script, on importing socket.io it raises an error
import {
PORT
} from './config';
import express from 'express';
import io from 'socket.io';
var app = express();
// respond with "hello world" when a GET request is made to the homepage
app.get('/', function(req, res) {
res.send('hello world')
});
io.on('connection', function(socket) {
console.log('a user connected');
});
app.listen(PORT, () => console.log(`Example app listening on port ${PORT}!`));
The error is
/index.js:17
_socket.default.on('connection', function (socket) {
^
TypeError: _socket.default.on is not a function
at Object.on (/Users/digvijay.upadhyay/digvijayu/websocket_with_node/src/index.js:15:4)
at Module._compile (module.js:643:30)
at Module._compile (/Users/digvijay.upadhyay/digvijayu/websocket_with_node/node_modules/pirates/lib/index.js:83:24)
at Module._extensions..js (module.js:654:10)
at Object.newLoader [as .js] (/Users/digvijay.upadhyay/digvijayu/websocket_with_node/node_modules/pirates/lib/index.js:88:7)
at Module.load (module.js:556:32)
at tryModuleLoad (module.js:499:12)
at Function.Module._load (module.js:491:3)
at Function.Module.runMain (module.js:684:10)
at Object. (/Users/digvijay.upadhyay/digvijayu/websocket_with_node/node_modules/#babel/node/lib/_babel-node.js:224:23)
[nodemon] app crashed - waiting for file changes before starting...
Successfully compiled 2 files with Babel. Successfully compiled 2
files with Babel.

Answer 1

You need to invoke function require('socket.io')() and pass there an express instance.
Please look at added code example:
const express = require('express');
const http = require('http');
const socketIO = require('socket.io');
const app = express();
const server = http.createServer(app);
// this line \/
const io = socketIO(server);
// this line /\
io.on('connection', (socket) => {
//...
});
server.listen(port, () => {
//...
});