import { ValidationError } from 'class-validator';
/**
 * Flattens class-validator errors into the same message array shape used by Nest ValidationPipe.
 * @param {Array<ValidationError>} errors - Validation errors to flatten.
 * @param {string} [parentProperty] - Parent property path.
 * @returns {Array<string>} Flattened validation messages.
 */
export declare function ApiRouteValidationFlattenErrors(errors: Array<ValidationError>, parentProperty?: string): Array<string>;