import { Type } from './type';
import { OutputOf, InputOf, FromFn, From } from './from';
declare type Any<A = any> = FromFn<A, any> | From<A, any>;
/**
 * Take one of the types. Merge the metadata from left to right.
 * If nothing matches, prints all the errors.
 */
export declare function union<T1 extends Any, T2s extends Any<InputOf<T1>>>(ts: [T1, ...T2s[]], { combineErrors, }?: {
    /**
     * Combine all the errors produced by the types.
     * Defaults to joining them with a newline.
     */
    combineErrors?(errors: string[]): string;
}): Type<InputOf<T1>, OutputOf<T1 | T2s>>;
export {};