• Version: v9.9.0
• Platform: 4.15.13-1-ARCH deps: update openssl to 1.0.1j #1 SMP PREEMPT Sun Mar 25 11:27:57 UTC 2018 x86_64 GNU/Linux
• Subsystem: stream

I believe commit 9c0c0e68ac introduced a breaking change to what events are emitted from child process streams stdout/stderr.

const { spawn } = require('child_process')

const ps = spawn('ls', ['-al'])

ps.stdout.on('finish', function() {
  console.log('Called `finish` on stdout')
});

ps.stdout.on('end', function() {
  console.log('Called `end` on stdout')
});

ps.stderr.on('finish', function() {
  console.log('Called `finish` on stderr')
});

ps.stderr.on('end', function() {
  console.log('Called `end` on stderr')
});

In node v9.9.0

Called `end` on stderr
Called `end` on stdout

In node v9.8.0

Called `end` on stderr
Called `finish` on stderr
Called `end` on stdout
Called `finish` on stdout

Per the documentation, finish should only be associated with a writable stream, so the current behavior in 9.9.0 seems to be accurate. Given that, I'm not sure if the previous behavior was a bug or not.