export declare function getDbDir(): string;
export declare function getDbPath(): string;
/** Rounds `value` to `decimals` decimal places. Shared by src/scaling.ts (per-field label
 *  rounding) and src/serving-parse.ts (derived-weight rounding). */
export declare function roundTo(value: number, decimals: number): number;
export declare function log(msg: string, err?: unknown): void;
/**
 * Normalize a barcode to 13-digit EAN-13.
 * If 12 digits (UPC-A), zero-pad to 13.
 * Returns null if the barcode is not 12 or 13 digits.
 */
export declare function normalizeBarcode(barcode: string): string | null;