import { Validator, ValidatorOptions } from './Validator';
import { I18nMessage } from '../i18n';
interface StringOptions<IsRequired extends boolean> extends ValidatorOptions<string, IsRequired> {
    minLength?: number;
    maxLength?: number;
}
export declare class StringValidator<T extends boolean = true> extends Validator<StringOptions<T>> {
    minLength(min: number): this;
    maxLength(max: number): this;
    optional(): StringValidator<false>;
    default(value: string): StringValidator<true>;
    protected isEmpty(value: any): boolean;
    protected validateValue(i18n: I18nMessage, obj: Record<string, any>, key: string, superKeys: string[]): string | void;
}
export {};