sorry for shameless plug but in case someone is looking for another express + ws middleware I've just published tinyws. Might be useful for those who want to use something newer than express-ws.

this is how you can use it with express:

import express from 'express'
import { tinyws } from 'tinyws'

const app = express()

app.use('/', tinyws())

app.use('/hmr', async (req, res) => {
  if (req.ws) {
    const ws = await req.ws()

    return ws.send('hello there')
  } else {
    res.send('Hello from HTTP!')
  }
})

app.listen(3000)

This project seems to be dead #135

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