handleValue method
Implementation
@override
File handleValue(String? key, dynamic value) {
var normalizedAbsolutePath = path.normalize(path.absolute(value));
final File result = File(normalizedAbsolutePath);
if (mustExist) {
if (result.existsSync() == false) {
throw ArgumentError('$result for parameter $key does not exist');
}
}
return result;
}