interface IsRequiredArg {
    value: unknown;
    help?: string;
}
interface IsGreaterThanArg {
    value: number;
    help?: string;
    comparator?: number;
}
interface IsValidDateArg {
    value: string;
    help?: string;
    format?: string;
}
export declare const isRequired: ({ value, help }: IsRequiredArg) => {
    payload: string;
    error: boolean;
};
export declare const isGreaterThan: ({ value, help, comparator }: IsGreaterThanArg) => {
    payload: string;
    error: boolean;
};
export declare const isValidDate: ({ value, help, format }: IsValidDateArg) => {
    payload: string;
    error: boolean;
};
export {};