import type { DuckDBConnectionPool } from './client.ts';
export interface PgDuckField {
    name: string;
}
export interface PgDuckQueryConfig {
    text: string;
    values?: unknown[];
    rowMode?: 'array';
}
export interface PgDuckQueryResult<TRow = unknown> {
    rows: TRow[];
    fields?: PgDuckField[];
    rowCount?: number | null;
}
export interface PgDuckClient {
    /**
     * Returns a result, or its rows. For SQL with several statements,
     * node-postgres returns one result per statement, and the last one is used.
     */
    query(query: string | PgDuckQueryConfig, values?: unknown[]): Promise<PgDuckQueryResult | PgDuckQueryResult[] | unknown[]>;
    close?(): Promise<void> | void;
    end?(): Promise<void> | void;
}
export interface PgDuckPoolClient extends PgDuckClient {
    release(): void;
}
export interface PgDuckPool {
    connect(): Promise<PgDuckPoolClient>;
    close?(): Promise<void> | void;
    end?(): Promise<void> | void;
}
export declare function createPgDuckConnectionPool(pool: PgDuckPool): DuckDBConnectionPool;