import type { PatternRule } from '../../types.js';
/**
 * Validates a Polish NIP (Numer Identyfikacji Podatkowej — Tax ID).
 * 10 digits, weights: [6, 5, 7, 2, 3, 4, 5, 6, 7]
 * Check digit = weighted_sum % 11; valid if result equals last digit (and != 10)
 */
export declare function nipChecksum(raw: string): boolean;
export declare const nipRule: PatternRule;
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