text: /* */ 
  module.exports = PassThrough;
  var Transform = require('./_stream_transform');
  var util = require('core-util-is');
  util.inherits = require('inherits');
  util.inherits(PassThrough, Transform);
  function PassThrough(options) {
    if (!(this instanceof PassThrough))
      return new PassThrough(options);
    Transform.call(this, options);
  }
  PassThrough.prototype._transform = function(chunk, encoding, cb) {
    cb(null, chunk);
  };
  