/**
 * Rule type.
 */
export declare type RuleType = 'and' | 'or';
/**
 * Operator callback function.
 */
export declare type OperatorFn = (a: any, b: any) => boolean;
/**
 * Rule json configuration.
 */
export interface RuleJson extends Object {
    and?: Array<RuleJson | ConditionJson>;
    or?: Array<RuleJson | ConditionJson>;
}
/**
 * Condition json configuration.
 */
export interface ConditionJson {
    fact: string;
    operator: string;
    value: any;
}