/// <reference types="node" />
declare module 'fork-stream' {
    import stream from 'stream';
    type ForkStreamOptions = (stream.ReadableOptions | stream.WritableOptions) & {
        classifier: (data: any, done: (err: Error, isTrue: boolean) => any) => void;
    };
    export default class ForkStream {
        a: stream.Readable;
        b: stream.Readable;
        constructor(options: ForkStreamOptions);
    }
}