createDirectory method

Future<Entry> createDirectory (String path, { bool exclusive: false })

Create a new directory with the specified path. If exclusive is true, the returned Future will complete with an error if a directory already exists with the specified path.

Implementation 

Future<Entry> createDirectory(String path, {bool exclusive: false}) {
  return _getDirectory(path,
      options: {'create': true, 'exclusive': exclusive});
}