import { ParquetCodec, QueryExecutor, Row } from "./storage.mjs";
interface DuckDBHandle {
  query: (sql: string, params?: unknown[]) => Promise<Row[]>;
  registerFileBuffer: (name: string, bytes: Uint8Array) => Promise<void>;
  copyFileToBuffer: (name: string) => Promise<Uint8Array>;
  dropFiles: (names: string[]) => Promise<void>;
  /**
   * Returns a unique path suitable for `COPY TO '…'` + `copyFileToBuffer`.
   * In Node this is an absolute path under `os.tmpdir()` so DuckDB doesn't
   * litter the CWD; in browsers/Workers it's a plain virtual-FS name.
   */
  makeTempPath: (ext: string) => string;
}
interface DuckDBFactory {
  getDuckDB: () => Promise<DuckDBHandle>;
}
interface DuckDBReadOptions {
  /**
   * Maximum non-URI parquet reads held in flight while registering DuckDB
   * buffers. Defaults to 16; callers handling unusually large files can lower
   * it to trade latency for peak JS memory.
   */
  bufferReadConcurrency?: number;
}
declare function createDuckDBCodec(factory: DuckDBFactory, options?: DuckDBReadOptions): ParquetCodec;
declare function createDuckDBExecutor(factory: DuckDBFactory, options?: DuckDBReadOptions): QueryExecutor;
export { DuckDBFactory, DuckDBHandle, DuckDBReadOptions, createDuckDBCodec, createDuckDBExecutor };