export declare type DateStringRule = {
    type: 'isAfter';
    value: string;
} | {
    type: 'isBefore';
    value: string;
} | {
    type: 'isIso8601Date';
} | {
    type: 'isRfc3339';
} | {
    type: 'isSame';
    value: string;
} | {
    type: 'isSameOrAfter';
    value: string;
} | {
    type: 'isSameOrBefore';
    value: string;
};