// hang process
setTimeout(function(){}, 9999999)
// in heavy development, there usually exists something that hangs the process.
// we use 'process.exit' to solve this quickly.

var stream = require('stream')
process.stdin
  .pipe(new stream.PassThrough()) // there can be a list of Transform
  .pipe(new stream.PassThrough()) // there can be a list of Transform
  .pipe(new stream.PassThrough()) // there can be a list of Transform
  .on('end', function() {
    // process.exit()
    // exit here will stop stdout from flushing
  })
  .pipe(process.stdout)
  .on('finish', function() {  // this event will not trigger
    process.exit()
  })