y.js

var path = require('path'),
    fs = require('fs'),
    express = require('express'),
    YUI = require('yui3').YUI;

var app = module.exports = express.createServer();

YUI({
  debug: true
}).use('dump', 'node', 'express', function(Y){

  app.configure(function(){
    app.set('views', process.cwd());
    app.use(express.logger());
    app.use(app.router);
  });

  app.register('.html', YUI);

  Y.log("Hello World!");
  Y.log(Y.dump({hello: 'world'}));

  app.get('/log', function(req, res, next){
    Y.log('app.get log');
    Y.log(Y.dump(req));
    res.render('y.html', {
      locals: {
        content: "#content",
        after: function(aY, options, partial) {
          //aY is a reference to the document in the request
          //Y is the global Y instance you created above.
          Y.log('res.render after');
          Y.log(Y.dump(res));
        }
      }
    });
  });
});

app.listen('3000');