/**
 * Luhn mod-10 checksum used by French SIREN/SIRET identifiers.
 * Input is checked digits-only: callers must `.trim()` and ensure length.
 */
export declare function isValidLuhn(input: string): boolean;
/**
 * SIRET checksum per the INSEE validation contract:
 * - the embedded SIREN (first 9 digits) must itself be Luhn-valid;
 * - the full 14 digits must be Luhn-valid, EXCEPT for La Poste
 *   (SIREN 356000000 exactly): its establishment SIRETs may fail Luhn and are
 *   then valid when the sum of the 14 digits is a multiple of 5. The head
 *   office (…00048) satisfies standard Luhn — the digit-sum rule is a
 *   fallback, not a replacement.
 */
export declare function isValidLuhnSiret(input: string): boolean;
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