Does not work with Vite.js and vue 3.

[Taykavol]

Describe the bug
The same code with webpack works. But Vite.js + Vue 3 is not. There is even no requests. Probably it's not problem of socket.io-client package but something wrong with socket.io-client.

To Reproduce

Socket.IO server version: 4.2.0

Server

import { Server } from "socket.io";

const io = new Server(3000, {});

io.on("connection", (socket) => {
  console.log(`connect ${socket.id}`);

  socket.on("disconnect", () => {
    console.log(`disconnect ${socket.id}`);
  });
});

Socket.IO client version: 4.2.0

Client

import { io } from "socket.io-client";

const socket = io("ws://localhost:3000/", {});

socket.on("connect", () => {
  console.log(`connect ${socket.id}`);
});

socket.on("disconnect", () => {
  console.log("disconnect");
});

Expected behavior
Expected to see console.log messages on server and client. But it's not working at all.

Platform:

• OS: [e.g. Windows 10]

[darrachequesne]

Could you please provide a complete example reproducing the issue? Thanks!

[Taykavol]

Could you please provide a complete example reproducing the issue? Thanks!

I am sorry, not expert in programming explaining. So the problem is the simplest code above works with webpack(vue-cli) but not work with vite.js +vue.

I created full repo example, https://github.com/Taykavol/socket.io-vite-and-vue-cli-example

Client
`import {io} from 'socket.io-client'
// io is works with webpack but not working with vite

const socket = io("ws://localhost:4000/", {});

socket.on("connect", () => {
// Works great! with webpack
alert(connect ${socket.id})
});

socket.on("disconnect", () => {
console.log("disconnect");
});

[Taykavol]

Also, now I checked that the versons(client) 4.1.x works great (event with socket.io server 4.2.0) but something wrong with 4.2.0 client.

[philippdormann]

can confirm.
v4.1.3 works fine
v4.2.0 breaks.

not sure how to debug this

also see vitejs/vite#4798

[darrachequesne]

Please see my answer here: vitejs/vite#4798 (comment)

[darrachequesne]

It should be fixed now:

• socketio/engine.io-client@c557707 included in engine.io-client@6.1.1 and socket.io-client@4.4.x
• socketio/engine.io-client@9fcaf58 included in engine.io-client@6.0.3 and socket.io-client@4.3.x

Please reopen if needed.