A Transform type constructor possible extension for through2

through2_extension.js

var Transform = require("stream").Transform
var inherits = require("util").inherits

module.exports.ctor = function ctor(fn) {
  function T(options) {
    if (!(this instanceof T)) return new T(options)
    Transform.call(this, options)
  }
  inherits(T, Transform)
  T.prototype._transform = fn

  return T
}