import { AbstractValidator } from '../abstract.validator';
/**
 * 字符串长度校验
  * @param lengthMin
  * @param lengthMax
  * @param message
 */
export declare class LengthValidator extends AbstractValidator {
    lengthMin: number;
    lengthMax: number;
    constructor(lengthMin?: number, lengthMax?: number, message?: string);
    valid(param: any | undefined): boolean;
}