/// <reference types="node" />
import * as t from 'io-ts';
import { Stream } from 'stream';
import { Either, Right } from 'fp-ts/lib/Either';
export declare const Integer: t.Type<number, string, unknown>;
export declare const ReadStream: t.Type<Stream, string, unknown>;
export declare function ensureRight<T>(e: Either<any, T>): asserts e is Right<T>;
export declare function readStreamToString(s: Stream): Promise<string>;
export declare const CommaSeparatedString: t.Type<string[], string, unknown>;
export declare function commaSeparated<T extends t.Type<any, string, unknown>>(decoder: T): t.Type<t.TypeOf<T>[], string, unknown>;
export declare function flattened<T extends t.Type<any[], string, unknown>>(decoder: T): t.Type<t.TypeOf<T>, string[], unknown>;