import { IExpressionable } from '../core/IExpressionable';
export interface IRule {
    value: any;
    isFunction: boolean;
    args?: Array<IRule>;
}
export declare class Rule implements IRule, IExpressionable<IRule> {
    args: Array<IRule>;
    isFunction: boolean;
    value: any;
    constructor(rule: IRule);
    static cast(rule: IRule): Rule;
    toExpression(): IRule;
}