import { AbstractStateRule } from '../abstract-state-rule.js';
/**
 * Validates Rio Grande do Norte (RN) IE numbers.
 *
 * 9 or 10 digits, prefix 20. Single Mod-11 DV (rest < 2 → 0).
 * 9-digit: weights [9,8,7,6,5,4,3,2]; 10-digit: weights [10,9,8,7,6,5,4,3,2].
 */
export declare class RnRule extends AbstractStateRule {
    execute(ie: string): boolean;
}