Z matchFileSystemEntity<Z>({
  required final FileSystemEntity entity,
  required final Z Function(Directory) directory,
  required final Z Function(File) file,
  required final Z Function(Link) link,
}) {
  if (entity is Directory) {
    return directory(entity);
  } else if (entity is File) {
    return file(entity);
  } else if (entity is Link) {
    return link(entity);
  } else {
    throw Exception(
      "Invalid state. " + entity.toString() + " was expected to be a directory, file or link.",
    );
  }
}