renameSync abstract method
Directory renameSync(Synchronously renames this directory. Returns 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 an exception is thrown.
Source
Directory renameSync(String newPath);
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https://api.dartlang.org/stable/1.24.3/dart-io/Directory/renameSync.html