import { type LogWriter, type ConnOperation, ClickHouseLogLevel } from '@clickhouse/client-common';
import type Stream from 'stream';
export interface Context {
    op: ConnOperation;
    log_level: ClickHouseLogLevel;
    log_writer: LogWriter;
    query_id: string;
}
/** Drains the response stream, as calling `destroy` on a {@link Stream.Readable} response stream
 *  will result in closing the underlying socket, and negate the KeepAlive feature benefits.
 *  See https://github.com/ClickHouse/clickhouse-js/pull/203
 *  @deprecated This method is not intended to be used outside of the client implementation anymore. Use `client.command()` instead, which will handle draining the stream internally when needed.
 * */
export declare function drainStream(stream: Stream.Readable): Promise<void>;
/** Drains the response stream, as calling `destroy` on a {@link Stream.Readable} response stream
 *  will result in closing the underlying socket, and negate the KeepAlive feature benefits.
 * Also, provides additional internal logging for debugging stream issues. Not intended to be used outside of the client implementation.
 *  See https://github.com/ClickHouse/clickhouse-js/pull/203 */
export declare function drainStreamInternal(ctx: Context, stream: Stream.Readable): Promise<void>;