/// <reference types="node" />
/// <reference types="node" />
import { Duplex } from "stream";
export declare class IOStream extends Duplex {
    private impl;
    private pending;
    private cancellable;
    constructor(impl: any);
    _destroy(error: Error | null, callback: (error: Error | null) => void): Promise<void>;
    _read(size: number): void;
    _write(chunk: any, encoding: BufferEncoding, callback: (error?: Error | null) => void): void;
    private track;
}