stdin/stdout pipe in node.js

test1.js

// So this is short and easier

process.stdin.resume()
process.stdin.on('data', function(data) { process.stdout.write(data) })
process.stdout.on('error', function(err) {
  if (err.code === 'EPIPE') return process.exit()
  process.emit('error', err)
})

test2.js

// But is this more "correct"?

process.stdin.resume()
process.stdin.on('data', function(data) { process.stdout.write(data) })
process.stdout.on('error', function epipeFilter(err) {
  if (err.code === 'EPIPE') return process.exit()
  // If there's more than one error handler (ie, us), then the error won't be bubbled up anyway
  if (process.stdout.listeners('error').length <= 1) {
    process.stdout.removeAllListeners() // Pretend we were never here
    process.stdout.emit('error', err) // Then emit as if we were never here
    process.stdout.on('error', epipeFilter) // Then reattach, ready for the next error!
  }
})