import { FormFieldRawValueGet } from './FormFieldControl';
export declare namespace ValidationRules {
    function maxFileSize(bytes: number): (value: FormFieldRawValueGet) => string | undefined;
    function isNumber(value: FormFieldRawValueGet): "Value is not a valid number." | undefined;
    function isPositiveNumber(value: FormFieldRawValueGet): "Value is not a positive number." | undefined;
    function isPositiveInteger(value: FormFieldRawValueGet): "Value is not a positive integer." | undefined;
    function isEmailAddress(value: FormFieldRawValueGet): "Invalid email address." | undefined;
}