Synchronously create the file. Existing files are left untouched by createSync. Calling createSync on an existing file might fail if there are restrictive permissions on the file.
If recursive
is false, the default, the file is created only if all directories in the path exist. If recursive
is true, all non-existing path components are created.
Throws a FileSystemException if the operation fails.
void createSync({bool recursive: false});
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https://api.dartlang.org/stable/2.0.0/dart-io/File/createSync.html