/**
 * Base class for per-state IE validation rules.
 *
 * Each Brazilian state has its own IE format and check-digit algorithm.
 * Subclasses implement {@link execute} with the state-specific logic.
 *
 * @internal
 */
export declare abstract class AbstractStateRule {
    abstract execute(ie: string): boolean;
    protected digits(v: string, pattern?: RegExp): string;
    protected toIntArray(digits: string): number[];
    protected allSameDigits(digits: string): boolean;
    protected sumProducts(digits: number[], weights: number[]): number;
}