import { MinMaxRuleConfig, Rule, RuleConfig } from '../validationRules';
export interface LengthRuleConfig extends RuleConfig {
    max?: MinMaxRuleConfig;
    min?: MinMaxRuleConfig;
}
export declare class LengthRule extends Rule {
    config: LengthRuleConfig;
    defaultMessage: string;
    constructor(config: LengthRuleConfig);
    allowAdd(value: any): boolean;
    allowRemove(value: any): boolean;
    private cleanValue;
    /**
     * Field is considered required when there is a min value..
     */
    get isRequired(): boolean;
    validate(value: any): string | null;
}