updateSync abstract method
void updateSync(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.
Source
void updateSync(String target);
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Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dartlang.org/stable/1.24.3/dart-io/Link/updateSync.html