build.js

var http = require('http'),
    fs = require('fs'),
    stringify = require('querystring').stringify;

var SRC_FILES = [
  'core.js',
  'event.js',
  'ajax.js',
  'data.js'
];

var src = SRC_FILES.reduce(function(buffer, file) {
  return buffer + fs.readFileSync('./src/' + file) + '\n';
}, '');

var req = http.request({
  host: 'closure-compiler.appspot.com',
  port: 80,
  path: '/compile',
  method: 'POST',
  headers: { 'Content-type': 'application/x-www-form-urlencoded' }
}, function(res) {
  res.on('data', function(chunk) {
    fs.writeFile('./dist/yocto.min.js', chunk);
  });
});

fs.writeFile('./dist/yocto.js', src);

req.write(stringify({
  js_code: src,
  compilation_level: 'ADVANCED_OPTIMIZATIONS',
  output_format: 'text',
  output_info: 'compiled_code'
}));

req.end();