Problems with Express and socket.io

[nojaf]

I'm having some errors with the following code

// @flow
import type { $Request, $Response} from 'express';

const hbs = require("hbs");
const express = require("express");
const app = express();
app.set("view engine", "hbs");
console.log( __dirname + "/views");
app.set("views", __dirname + "/views");

// $@FlowFixMe
const http = require("http").Server(app);
const io = require('socket.io')(http);

io.on("connection", () => {
    console.log("new user connected");
});

app.get('/', (req: $Request, res: $Response) => {
    res.render("index");
});

http.listen(8300, () => {
    console.log("Server running on 8300");
});

flow output:

PS C:\temp\express-hbs> flow                                                                
server/index.js:4                                                                           
  4: const hbs = require("hbs");                                                            
                         ^^^^^ hbs. Required module not found                               
                                                                                            
server/index.js:12                                                                          
 12: const http = require("http").Server(app);                                              
                                  ^^^^^^ property `Server`. Property not found in           
 12: const http = require("http").Server(app);                                              
                  ^^^^^^^^^^^^^^^ module `http`                                             
                                                                                            
server/index.js:13                                                                          
 13: const io = require('socket.io')(http);                                                 
                        ^^^^^^^^^^^ socket.io. Required module not found                    
                                                                                            
                                                                                            
Found 3 errors                                                                              

So the .Server thing can be ignored by the $FlowFixMe but how can I tell flow to be cool with socket.io? There are no definition files for socket.io or hbs.

I'd like some workarounds and I'm not sure what my options are here.

[gantoine]

@nojaf I've just opened a PR which adds definitions for the socket.io server API. Once merged it should address your issue.

Also, flow-typed install should have generated a stub for socket.io, so check that the stub does in fact exist in your project.