import { StringRuleChecker } from './string-rule-checker';
import { Iso3166Part1AlphaVersion } from './string-types';
import { GuardResult } from '../../core/guard-result';
export declare class StringIsIso3166Part1Alpha extends StringRuleChecker<{
    type: 'isIso3166Part1Alpha';
    version?: Iso3166Part1AlphaVersion;
}> {
    constructor(rule: {
        type: 'isIso3166Part1Alpha';
        version?: Iso3166Part1AlphaVersion;
    }, value: string);
    /**
     * @override
     */
    exec(): GuardResult;
    private isIso3166Part1Alpha2;
    private isIso3166Part1Alpha3;
    private isIso3166Part1Alpha;
}