Updates the link. Returns a Future<Link>
that completes with the link when it has been updated. Calling update on a non-existing link will complete its returned future with an exception.
On the Windows platform, this will only work with directories, and the target directory must exist.
Future<Link> update(String target);
© 2012 the Dart project authors
Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dartlang.org/stable/2.0.0/dart-io/Link/update.html