• Version: 10.1.0, 10.2.0, 11.0.0-pre
• Platform: Darwin (), maybe all platforms
• Subsystem:

const {Socket} = require('net')
const s = new Socket
s.on('data', () => {
})

s.removeAllListeners()
s.listenerCount('data') // 0 expected, but got 1

If there is no arguments for stream::removeAllListeners(), the argument to be passed into Stream.prototype.removeAllListeners will be undefined, see here

The undefined value causes that the events::removeAllListeners(undefined) will do nothing. see here