Precompile .handlebars templates with node js

Jakefile.js

var fs = require('fs');
var vm = require('vm');

var emberjs = fs.readFileSync('path/to/ember.js', 'utf8');
var templatesDir = 'path/to/template/dir';

desc('Compile all .handlebars templates');
task({ 'handlebars': [] }, function () {
  process.stdout.write('Compiling .handlebars templates');
  var files = fs.readdirSync(templatesDir);
  var i;
  for (i = 0; i < files.length; i++) {
    if (/\.handlebars$/.test(files[i])) {
      compileHandlebarsTemplate(templatesDir + '/' + files[i]);
      process.stdout.write('.');
    }
  }
  console.log('done');
});

function compileHandlebarsTemplate(file) {
  //dummy jQuery
  var jQuery = function() { return jQuery; };
  jQuery.ready = function() { return jQuery; };
  jQuery.inArray = function() { return jQuery; };
  jQuery.jquery = "1.7.1";

  //dummy DOM element
  var element = {
    firstChild: function () { return element; },
    innerHTML: function () { return element; }
  };

  var sandbox = {
    // DOM
    document: {
      createRange: false,
      createElement: function() { return element; }
    },

    // Console
    console: console,

    // jQuery
    jQuery: jQuery,
    $: jQuery,

    // handlebars template to compile
    template: fs.readFileSync(file, 'utf8'),

    // compiled handlebars template
    templatejs: null
  };

  // window
  sandbox.window = sandbox;

  // create a context for the vm using the sandbox data
  var context = vm.createContext(sandbox);

  // load Ember into the sandbox
  vm.runInContext(emberjs, context, 'ember.js');

  //compile the handlebars template inside the vm context
  vm.runInContext('templatejs = Ember.Handlebars.precompile(template).toString();', context);

  //extract the compiled template from the vm context and save to .js file
  fs.writeFileSync(file.replace(/\.handlebars$/, '.js'), context.templatejs, 'utf8');
}