/// <reference types="node" />
import { TransformOpt, WritableTyped } from '../stream.model';
/**
 * Allows "forking" a stream inside pipeline into a number of pipeline chains (2 or more).
 * Currently does NOT (!) maintain backpressure.
 * Error in the forked pipeline will propagate up to the main pipeline (and log error, to be sure).
 * Will wait until all forked pipelines are completed before completing the stream.
 */
export declare function writableFork<T>(chains: NodeJS.WritableStream[][], opt?: TransformOpt): WritableTyped<T>;