gistfile1.txt

$ cat p.js
var stream = require('stream');
var util = require('util');

var Peek = function () {
  stream.Writable.call(this);
};

util.inherits(Peek, stream.Writable);

Peek.prototype._write = function (chunk, encoding, callback) {
  callback();
};

var preview = new Peek();
preview.on('finish', function () {
  console.log('finish');
});

preview.write('some text', 'utf-8', function(er) {
  console.log('write cb');
});

preview.end(function() {
  console.log('end cb');
});

console.log('end of tick');

$ ./node p.js
end of tick
write cb
finish
end cb

$ ../node-v0.10/node p.js
finish
end of tick
write cb
end cb