/** Read an environment variable, or `d` when it is unset. */
export declare const env: (k: string, d: string) => string;
export declare const DB_PATH: string;
export declare const D: number;
export declare const SEED: number;
export declare const CHECKPOINT_BYTES: number;
export declare const PARQUET_BATCH_BYTES: number;
export declare const LOCAL_PATH: string;
export declare const CACHE_DIR: string;
export declare const MAX_CACHE_BYTES: number;
export declare const PROGRESS_MS: number;
export declare const INDEX_MAINTENANCE: boolean;
export declare const DOWNLOAD_TRIES = 5;
export declare const PART_SUFFIX = ".part";
export declare const INFER_TIMEOUT_MS: number;
export declare const STALL_MS: number;
export declare const CACHE_WAIT_MS: number;
export declare const VECTOR_CACHE_MB: number;
export declare const SQLITE_CACHE_MB: number;
export declare const MAX_MB: number;
export declare const MAX_BYTES: number;