import { Runtype } from './runtype';
declare type UnpackRuntypes<T extends Runtype<any>> = T extends Runtype<infer R> ? R : never;
/**
 * A union of runtypes.
 */
export declare function union<V extends Runtype<any>[]>(...runtypes: V): Runtype<UnpackRuntypes<V[number]>>;
export {};