import { QueryAdapter } from '../../types';
export declare class DuckDBWebQueryAdapter implements QueryAdapter {
    private db;
    private connection;
    constructor();
    open: () => Promise<void>;
    close: () => Promise<void>;
    writeFile: <T extends Blob>(fileName: string, source: T) => Promise<void>;
    query: (sql: string) => Promise<{
        dataset: any[];
        table: any;
    }>;
    getSchema: (fileName: string) => Promise<any>;
}