toJson method

@override Map<String, dynamic> toJson()

Implementation

@override
Map<String, dynamic> toJson() {
  final json = <String, dynamic>{
    'type': 'image',
    'mimeType': mimeType,
  };

  // 2025 spec uses 'data' for base64, but maintain 'url' for compatibility
  if (data != null) {
    json['data'] = data!;
  } else if (url != null) {
    json['url'] = url!;
  }

  if (annotations != null) json['annotations'] = annotations!;
  return json;
}