How to use the readable-stream.Writable.call function in readable-stream

function DeadEndStream(options) {
  Writable.call(this, options);
}

}
  if (!opts) opts = {}

  var encoding = opts.encoding
  var shouldInferEncoding = false

  if (!encoding) {
    shouldInferEncoding = true
  } else {
    encoding =  String(encoding).toLowerCase()
    if (encoding === 'u8' || encoding === 'uint8') {
      encoding = 'uint8array'
    }
  }

  Writable.call(this, { objectMode: true })

  this.encoding = encoding
  this.shouldInferEncoding = shouldInferEncoding

  if (cb) this.on('finish', function () { cb(this.getBody()) })
  this.body = []
}

var Extract = function (opts) {
  if (!(this instanceof Extract)) return new Extract(opts)
  Writable.call(this, opts)

  this._offset = 0
  this._buffer = bl()
  this._missing = 0
  this._onparse = noop
  this._header = null
  this._stream = null
  this._overflow = null
  this._cb = null
  this._locked = false
  this._destroyed = false
  this._pax = null
  this._paxGlobal = null
  this._gnuLongPath = null
  this._gnuLongLinkPath = null

function ByteCounter(options) {
  Writable.call(this, options);
  this.bytes = 0;
}

function CallbackStream (options, callback) {
  if (!(this instanceof CallbackStream)) {
    return new CallbackStream(options, callback)
  }

  if (typeof options === 'function') {
    callback = options
    options = {}
  }

  Writable.call(this, options)

  this.results = []
  this.callback = callback

  this.on('finish', deliversCallback)
  this.once('pipe', handlePipe)
}

}
  if (!opts) opts = {}

  var encoding = opts.encoding
  var shouldInferEncoding = false

  if (!encoding) {
    shouldInferEncoding = true
  } else {
    encoding =  String(encoding).toLowerCase()
    if (encoding === 'u8' || encoding === 'uint8') {
      encoding = 'uint8array'
    }
  }

  Writable.call(this, { objectMode: true })

  this.encoding = encoding
  this.shouldInferEncoding = shouldInferEncoding

  if (cb) this.on('finish', function () { cb(this.getBody()) })
  this.body = []
}

}
  if (!opts) opts = {}

  var encoding = opts.encoding
  var shouldInferEncoding = false

  if (!encoding) {
    shouldInferEncoding = true
  } else {
    encoding =  String(encoding).toLowerCase()
    if (encoding === 'u8' || encoding === 'uint8') {
      encoding = 'uint8array'
    }
  }

  Writable.call(this, { objectMode: true })

  this.encoding = encoding
  this.shouldInferEncoding = shouldInferEncoding

  if (cb) this.on('finish', function () { cb(this.getBody()) })
  this.body = []
}

var Extract = function (opts) {
  if (!(this instanceof Extract)) return new Extract(opts)
  Writable.call(this, opts)

  opts = opts || {}

  this._offset = 0
  this._buffer = bl()
  this._missing = 0
  this._partial = false
  this._onparse = noop
  this._header = null
  this._stream = null
  this._overflow = null
  this._cb = null
  this._locked = false
  this._destroyed = false
  this._pax = null
  this._paxGlobal = null

function Writable( opts ) {
		WritableStream.call( this, opts );
		return this;
	}