code: function readDir(path, callback) {
    nodeFs.readdir(path, function (err, names) {
      if (err) {
        if (err.code === "ENOENT") return callback();
        return callback(err);
      }
      return callback(null, names);
    });
  }
docs: Reads all entry names for a given path. All names are relative to the directory itself, not fully qualified paths. => array<name> => undefined if directory does not exist