• Version: 11.8.0, 11.9.0
• Platform: Windows 10 (x64)
• Subsystem: console

This code produces repeated output:

const readline = require('readline')
const process = require('process')

let rl = readline.createInterface({terminal: true, input: process.stdin, output: process.stdout})
rl.resume()
rl.input.on('data', (chunk) => {
  console.log(`Received ${chunk.length} bytes of data - content was: ${chunk}`)
})

Run this with Node 11.8.0 or above and press the down arrow; two messages are produced:

Received 3 bytes of data - content was:

Received 3 bytes of data - content was:

Revert to Node 11.7.0, a single message is produced.

Received 3 bytes of data - content was:

This breaks, among many things, scrolling through menus in Inquirer.js: SBoudrias/Inquirer.js#778

This appears to be Windows specific (as far as I could tell, I was only able to test on a Linux VM via Docker right now).

Git bisect tells me this issue first appeared with c0859d7, which upgraded libuv to 1.25.0.

I'll keep digging into libuv (I already have an idea of where the problem was introduced in 1.25.0) but since this impacts Node on Windows somehwat significantly I figured it would be useful to have a way to track this!