/// <reference types="node" />
import stream from 'stream';
import VinylFile from 'vinyl';
import { TT$ } from '@upradata/util';
export declare type PassThroughFunctionObj<Data> = {
    transform?: (data: Data) => TT$<any>;
    flush?: () => TT$<any>;
};
export declare type PassThroughFunction<Data> = (data: Data) => TT$<any>;
export declare type PassThroughFunctionOptions<Data> = PassThroughFunctionObj<Data> | PassThroughFunction<Data>;
export declare type PassThroughOptions = stream.DuplexOptions & {
    sink?: boolean;
};
export declare function passThroughImpl<Data, Opts extends PassThroughOptions>(options: Opts, passThrounghFunc?: PassThroughFunctionOptions<Data>): Opts['sink'] extends true ? NodeJS.ReadableStream : stream.Transform;
export declare const passThrough: {
    <Data>(passThrounghFunc?: PassThroughFunctionOptions<Data>, options?: PassThroughOptions): stream.Transform;
    vinyl: {
        (passThrounghFunc?: PassThroughFunctionOptions<VinylFile>, options?: PassThroughOptions): stream.Transform;
        sink(passThrounghFunc?: PassThroughFunctionOptions<VinylFile>, options?: PassThroughOptions): stream.Transform;
    };
    sink<Data_1>(passThrounghFunc?: PassThroughFunctionOptions<Data_1>, options?: PassThroughOptions): stream.Transform;
};