gistfile1.js

var Readable = require('stream').Readable;

var r = new Readable({ lowWaterMark: 0 });
r._read = function (bytes, done) {
  console.error('read %d bytes', bytes);
  done(null, Buffer('test'));
};

r.on('readable', function () {
  console.error('readable event');
});

// unnecessary hack?
//r.read(0);