non-blocking multiprocess express webserver for long time consuming tasks

.js

const express = require('express')
const { fork } = require('child_process')

const app = express()

app.get('/', (req, res) => {
    const name = req.query.name
    
    const cp = fork('./greetings.js') // heavy task example
    cp.send({ "name", name })
    cp.on("message", message => {
      res.send(message)
    })
})

app.listen(PORT, () => console.log(`Listening @ http://localhost:${PORT}`))

greetings.js

process.on("message", message => {
  const res = Greetings(message.name)
  process.send(res)
  process.exit()
})

const Greetings = (name) => return `Hello ${name}!`