import type { Readable } from "stream";
/**
 * @internal
 * @param stream - to be split.
 * @returns stream split into two identical streams.
 */
export declare function splitStream(stream: Readable): Promise<[Readable, Readable]>;
/**
 * @internal
 */
export declare function splitStream(stream: ReadableStream): Promise<[ReadableStream, ReadableStream]>;
