export declare function tcknChecksumOk(digits: string): boolean;
/**
 * Pair similarly named TCKN-like keys on one row. Concatenation (either
 * order) must checksum. Returns the number of fields masked.
 */
export declare function maskSplitTcknFields(row: Record<string, unknown>): {
    count: number;
    maskedKeys: string[];
};
//# sourceMappingURL=tckn.d.ts.map