build.js

var util  = require('util'),
    spawn = require('child_process').spawn,
    fs = require('fs'),
    vm = require('vm'),
    find    = spawn('find', ['./lib', '-name', '*.js']),
    jsfiles;
    
find.stderr.on('data', function (data) {
  console.log('something went wrong with find ' + data);
  process.exit();
});


find.stdout.on('data', function (data) {
    jsfiles = data.toString().split('\n');
    // remove emptyline
    jsfiles.pop();
    appendToPythonjs();
});

var appendToPythonjs = function () {
  var pythonjs = fs.readFileSync('python.js').toString();
  jsfiles.forEach(function (file) {
    console.log("appending " + file);
    var moduleCode = fs.readFileSync(file).toString(),
        moduleName = file.split('/')[-1];
    moduleCode = moduleCode.replace('"use strict";', ''); 
    pythonjs += 'Module[\'' + moduleName + '\']=' + moduleCode;
  });
  minify(pythonjs);
};

var minify = function (js) {
  // minify js
  var minModules = {},
      sandbox = {
        console:{},
        print: function () {},
      };
  
  vm.runInNewContext(js, sandbox);
  jsfiles.forEach(function (file) {
    var moduleName = file.split('/')[-1],
        moduleCode = sandbox.Module[moduleName];
    minModules[file] = moduleCode;
  });
  console.log(util.inspect(minModules));
}