/**
 * Parameter decorator to validate a route parameter as a MongoId.
 *
 * @param {string} parameterName - Name of the parameter
 * @returns {ParameterDecorator}
 */
export declare function MongoIdParam(parameterName: string): ParameterDecorator;
/**
 * Adds Swagger metadata for MongoId parameters.
 *
 * @param {string} parameterName - Parameter name for docs/errors
 * @param {string} description - Optional custom description
 * @returns {MethodDecorator & ClassDecorator}
 */
export declare function ApiMongoIdParam(parameterName: string, description?: string): MethodDecorator & ClassDecorator;