type UUIDVersionValidation = 'v1' | 'v2' | 'v3' | 'v4' | 'v5' | 'v6' | 'v7' | 'v8' | 'NilUUID' | 'MaxUUID' | undefined;
/**
 * @function uuidVersionValidation
 * @description Validates a UUID string or Buffer and returns its version identifier.
 *
 * Validates the input as a UUID and extracts the version from the appropriate position.
 * Returns a string indicating the UUID version ('v1' through 'v8'), or special identifiers
 * for Nil UUID (all zeros) and Max UUID (all ones). If the input is not a valid UUID,
 * returns `undefined`.
 *
 * @param {string | Buffer} uuid - The UUID as a string or Buffer.
 * @returns {UUIDVersionValidation} A version string ('v1'-'v8'), 'NilUUID', 'MaxUUID', or `undefined` if invalid.
 *
 * @example
 * // Returns version identifier for UUIDv7
 * uuidVersionValidation('018fd8f9-8c00-7a4c-8a47-1a6d4b90f3a1');
 * // 'v7'
 *
 * @example
 * // Returns version identifier for UUIDv4
 * uuidVersionValidation('550e8400-e29b-41d4-a716-446655440000');
 * // 'v4'
 *
 * @example
 * // Returns special identifier for Nil UUID
 * uuidVersionValidation('00000000-0000-0000-0000-000000000000');
 * // 'NilUUID'
 *
 * @example
 * // Returns undefined for invalid UUID
 * uuidVersionValidation('not-a-uuid');
 */
declare const uuidVersionValidation: (uuid: string | Buffer) => UUIDVersionValidation;
export { type UUIDVersionValidation, uuidVersionValidation };