Synchronously updates the link. Calling updateSync on a non-existing link will throw an exception.
On the Windows platform, this will only work with directories, and the target directory must exist.
void updateSync(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/updateSync.html