toJson method
Implementation
@override
Map<String, Object?> toJson() => {
if (minSize != null) "min_size": encodeValue(minSize),
if (maxSize != null) "max_size": encodeValue(maxSize),
if (exactSize != null) "exact_size": encodeValue(exactSize),
if (contentTypes != null) "content_types": encodeValue(contentTypes),
if (extensions != null) "extensions": encodeValue(extensions),
if (filename != null) "filename": encodeValue(filename),
};