import type { DataFormat, IsSame, QueryParamsWithFormat } from '@clickhouse/client-common';
import { ClickHouseClient } from '@clickhouse/client-common';
import type Stream from 'stream';
import type { NodeClickHouseClientConfigOptions } from './config';
import type { ResultSet } from './result_set';
/** If the Format is not a literal type, fall back to the default behavior of the ResultSet,
 *  allowing to call all methods with all data shapes variants,
 *  and avoiding generated types that include all possible DataFormat literal values. */
export type QueryResult<Format extends DataFormat> = IsSame<Format, DataFormat> extends true ? ResultSet<unknown> : ResultSet<Format>;
export declare class NodeClickHouseClient extends ClickHouseClient<Stream.Readable> {
    /** See {@link ClickHouseClient.query}. */
    query<Format extends DataFormat = 'JSON'>(params: QueryParamsWithFormat<Format>): Promise<QueryResult<Format>>;
}
export declare function createClient(config?: NodeClickHouseClientConfigOptions): NodeClickHouseClient;