TypeError: expressify is not a function

[haoynmail]

example:
import uWS from "uWebSockets.js"
import expressify from "uwebsockets-express"

const uwsApp = uWS.App();
const app = expressify(uwsApp);

// use existing middleware implementations!
app.use(express.json());
app.use('/', serveIndex(path.join(__dirname, ".."), { icons: true, hidden: true }))
app.use('/', express.static(path.join(__dirname, "..")));

// register routes
app.get("/hello", (req, res) => {
res.json({ hello: "world!" });
});

app.listen(8000);

Error：
const app = expressify(uwsApp)
^
TypeError: expressify is not a function

Operation process：
1.npm i uWebSockets.js-express
2.npm i uNetworking/uWebSockets.js#v20.31.0
3. npm i express
4. npm i -D [email protected]

[endel]

This works fine - could not reproduce it here.

Please provide a complete example (including package.json and how you run the application). The real issue is likely there.

[haoynmail]

thank you replay
code as follow:

server.js:
import uWS from 'uWebSockets.js'
import expressify from 'uwebsockets-express'
import { join } from 'path'

const uwsApp = uWS.App().ws('/', {
// handle messages from client
open: (socket) => {
/ For now we only have one canvas */
//socket.subscribe("drawing/canvas1");
},

message:  (socket, message, isBinary) => {
    /* In this simplified example we only have drawing commands */
    socket.send(message, true)
}

})

const app = expressify(uwsApp)
app.use(express.static(join(__dirname)))
// finally listen using the app on port 9001
app.listen(9001, () => console.log('server listen at localhost:9001'))

package.json:

{
"name": "nodejs-console",
"version": "0.0.0",
"description": "NodejsConsole",
"main": "server.js",
"type": "module",
"author": {
"name": ""
},
"dependencies": {
"express": "^4.18.2",
"uwebsockets-express": "^1.3.4",
"uWebSockets.js": "github:uNetworking/uWebSockets.js#v20.31.0"
}
}

Do:
node server

[NovaSagittarii]

Using npm's uWebSockets-express 1.3.4, node v18.9.0

While trying to set up uWS with express, I ran into this issue as well. To fix this, I tried checking what the default export was doing using console.log debugging.

import expressify from 'uwebsockets-express';
console.log(expressify);
/* Prints
{
  Application: [Getter],
  IncomingMessage: [Getter],
  ServerResponse: [Getter],
  Socket: [Getter],
  default: [Function: default_1]
}
*/

Looking into the index.js files, this expressify.default did seem to be the function that accepted a uWS.App and returned an express Application, so I aliased expressify as the default export's default member.

import uWSExpress from "uwebsockets-express"
const expressify = uWSExpress.default;
console.log(expressify);
/* Prints
[Function: default_1]
*/

This seems to be the real expressify function, and I'm able to get the example code working now.

import { fileURLToPath } from 'url';
import path, { dirname } from 'path';
const __filename = fileURLToPath(import.meta.url);
const __dirname = dirname(__filename); // dealing with "type":"module"

import express from 'express';
import uWS from "uWebSockets.js"
import expressify from "uwebsockets-express"

const uwsApp = uWS.App();
const app = expressify.default(uwsApp); // or alias it, either works (.default was added)

// use existing middleware implementations!
app.use(express.json());
// app.use('/', serveIndex(path.join(__dirname, ".."), { icons: true, hidden: true })) // not sure which serveIndex this is from
app.use('/', express.static(path.join(__dirname, "..")));

// register routes
app.get("/hello", (req, res) => {
res.json({ hello: "world!" });
});

app.listen(8000);

You can test this by going to localhost:8000/hello after running the server.

I'm confused why this works, and according to this project's src/index.ts, the intended way should work with the export default function line. https://github.com/colyseus/uWebSockets-express/blob/master/src/index.ts#L4

[haoynmail]

Using the example you provided, ok

thank you

[devlsh]

+1 on this, having to do the default manual call - guessing it's due to my server being "type": "module",