Auto-optimization with Express and RequireJS

app.js

var express = require('express'),
    requirejs = require('requirejs'),
    app = module.exports = express.createServer();

app.configure('development', function(){
  // Use development version of static files 
  app.use(express.static(__dirname + '/public'));
});

app.configure('production', function(){
  // Optimize the javascript in the public folder and
  // copy it to the public_build folder.
  requirejs.optimize({
    appDir: "public/",
    baseUrl: "javascripts",
    dir: "public_build",
    modules: [
      {
        name: "main"
      }
    ]
  }, function() {
    console.log('Successfully optimized javascript');
  });

  // Use minified static files
  app.use(express.static(__dirname + '/public_build'));
});