_fs.walkSync.js

fs.walkSync = function (start, callback) {
  var stat = fs.statSync(start);
  if (stat.isDirectory()) {
    var filenames = fs.readdirSync(start)
    var coll = filenames.reduce(function (acc, i) {
      var abspath = path.join(start, i);

      if (fs.statSync(abspath).isDirectory()) {
        acc.dirs.push(abspath);
      } else {
        acc.names.push(abspath);
      }

      return acc;
    }, {"names": [], "dirs": []});

    callback(start, coll.dirs, coll.names);

    coll.dirs.forEach(function (d) {
      fs.walkSync(d, callback);
    });

  } else {
    return null;
  }
};