import { Readable } from 'stream';
import { DuckDBResult } from '@duckdb/node-api';
import { Transform } from './Transform';
/**
 * Streams a DuckDB result as hydrated row objects, one fetched chunk (up to 2048 rows) per
 * `await`. The consumer's `highWaterMark` bounds how far ahead of it the chunks are read.
 */
export declare class DuckDBRowStream extends Readable {
    private readonly result;
    private readonly transform;
    private readonly onClose;
    private reading;
    private pendingFetch;
    private batch;
    private idx;
    constructor(result: DuckDBResult, transform: Transform, onClose: () => void, highWaterMark: number);
    _read(): Promise<void>;
    _destroy(error: Error | null, callback: (error?: Error | null) => void): void;
}
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