import { Rule, Static } from '../../core';
import { ValidationError, ErrorJson } from '../../errors/ValidationError';
export declare class UnionValidationError extends ValidationError {
    readonly input: unknown;
    readonly errors: unknown[];
    constructor(input: unknown, errors: unknown[]);
    static getErrorsAsJson(input: unknown, errors: unknown[]): ErrorJson[];
    toJSON(): ErrorJson[];
}
export declare function union<Rules extends [Rule<any>, ...Rule<any>[]]>(...rules: Rules): (input: unknown) => Static<Rules[number]>;