import { Duplex } from 'stream';
interface Callback {
    (): void;
}
declare class BufferStream extends Duplex {
    private is_closed;
    private buffer;
    constructor();
    _read(): void;
    _write(chunk: Buffer, _encoding: string, callback: Callback): void;
    handleFinished(): void;
    private pushClosed;
    private emptyBuffer;
    private isClosed;
    private isBuffering;
    private addToBuffer;
}
export default BufferStream;