export declare function isoFormat(value: any, helpers: any): {
    value: any;
    errors?: undefined;
} | {
    errors: any;
    value?: undefined;
};
export declare function onlyDate(value: any, helpers: any, { args }?: {
    args: {
        format: string;
    };
}): {
    value: any;
    errors?: undefined;
} | {
    errors: any;
    value?: undefined;
};
declare const _default: any;
export default _default;