PassThrough {
  _readableState:
   ReadableState {
     objectMode: false,
     highWaterMark: 16384,
     buffer: BufferList { head: [Object], tail: [Object], length: 1 },
     length: 616,
     pipes: null,
     pipesCount: 0,
     flowing: null,
     ended: false,
     endEmitted: false,
     reading: true,
     sync: false,
     needReadable: true,
     emittedReadable: true,
     readableListening: false,
     resumeScheduled: false,
     emitClose: true,
     destroyed: false,
     defaultEncoding: 'utf8',
     awaitDrain: 0,
     readingMore: false,
     decoder: null,
     encoding: null },
  readable: true,
  _events:
   { prefinish: [Function: prefinish],
     unpipe: [Function: onunpipe],
     drain: [Function: pipeOnDrainFunctionResult],
     error: [ [Function: onerror], [Function] ],
     close:
      { [Function: bound onceWrapper] listener: [Function: onclose] },
     finish:
      { [Function: bound onceWrapper] listener: [Function: onfinish] } },
  _eventsCount: 6,
  _maxListeners: undefined,
  _writableState:
   WritableState {
     objectMode: false,
     highWaterMark: 16384,
     finalCalled: false,
     needDrain: false,
     ending: false,
     ended: false,
     finished: false,
     destroyed: false,
     decodeStrings: true,
     defaultEncoding: 'utf8',
     length: 0,
     writing: false,
     corked: 0,
     sync: false,
     bufferProcessing: false,
     onwrite: [Function: bound onwrite],
     writecb: null,
     writelen: 0,
     bufferedRequest: null,
     lastBufferedRequest: null,
     pendingcb: 0,
     prefinished: false,
     errorEmitted: false,
     emitClose: true,
     bufferedRequestCount: 0,
     corkedRequestsFree:
      { next: null,
        entry: null,
        finish: [Function: bound onCorkedFinish] } },
  writable: true,
  allowHalfOpen: true,
  _transformState:
   { afterTransform: [Function: bound afterTransform],
     needTransform: true,
     transforming: false,
     writecb: null,
     writechunk: null,
     writeencoding: 'buffer' } }