export declare function isMaybePotentiallyUnsafeDateString(mixed: any): mixed is null | undefined | (string);
export declare function isMaybeValidDateString(mixed: any): mixed is null | undefined | (string);
export declare function isMaybeBeforeString(mixed: any, x: Date): mixed is null | undefined | (string);
export declare function isMaybeAfterString(mixed: any, x: Date): mixed is null | undefined | (string);
export declare function isMaybeBeforeOrAtString(mixed: any, x: Date): mixed is null | undefined | (string);
export declare function isMaybeAfterOrAtString(mixed: any, x: Date): mixed is null | undefined | (string);
export declare function isMaybeRangeString(mixed: any, args: {
    min?: Date;
    max?: Date;
}): mixed is null | undefined | (string);