rename abstract method
Future<Directory> rename(Renames this directory. Returns a Future<Directory>
that completes with a Directory instance for the renamed directory.
If newPath identifies an existing directory, that directory is replaced. If newPath identifies an existing file, the operation fails and the future completes with an exception.
Source
Future<Directory> rename(String newPath);
© 2012 the Dart project authors
Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dartlang.org/stable/1.24.3/dart-io/Directory/rename.html