import { ArrayFieldProps, FieldProps } from '../form-builder/types';
export declare const emailRegex: RegExp;
export declare type ValidationFunctionResult<T> = void | undefined | string | Promise<unknown> | T;
export declare type ValidationFunction<T> = (value: T, props: FieldProps<T>) => ValidationFunctionResult<T>;
export declare type ValidationFunctionArray<T> = (value: T[], props: ArrayFieldProps<T>) => ValidationFunctionResult<T>;
export declare const chainArrayValidations: <T>(props: ArrayFieldProps<T>, validations: ValidationFunctionArray<T>[]) => (value: T[]) => ValidationFunctionResult<T>;
export declare const chainValidations: <T>(props: FieldProps<T>, validations: ValidationFunction<T>[]) => (value: T) => ValidationFunctionResult<T>;
export declare const required: <T>(value: T, props: FieldProps<T>) => ValidationFunctionResult<T>;
export declare const maxLength: <T>(value: T[], props: ArrayFieldProps<T>) => ValidationFunctionResult<T>;
export declare const minLength: <T>(value: T[], props: ArrayFieldProps<T>) => ValidationFunctionResult<T>;
export declare const requiredLength: <T>(value: T[], props: ArrayFieldProps<T>) => ValidationFunctionResult<T>;
/**
 * This function is used to validate an email address, while returning error messages if an email
 * is invalid. The logic is as follows:
 *
 *  1. Ensure the email address is a string. If it's not, return an error message
 *  2. Ensure that one of the following is true, else output an error message:
 *    2a. The field is not required -AND- the field has no entered value
 *    2b. The value in the field matches an email validation regular expression
 *
 * @param emailString
 * @param props
 */
export declare const isValidEmail: <T>(emailString: T, props: FieldProps<T>) => ValidationFunctionResult<T>;
/**
 * This function is used to validate an date field and make sure it's not in the future
 *
 * @param dateString
 * @param props
 */
export declare const isValidDate: <T>(dateString: T, props: FieldProps<T>) => ValidationFunctionResult<T>;
export declare const isValidPhone: <T>(phoneString: T, props: FieldProps<T>) => ValidationFunctionResult<T>;
/**
 * Conditions for valid SSN from the original 1010ez pdf form:
 * '123456789' is not a valid SSN
 * A value where the first 3 digits are 0 is not a valid SSN
 * A value where the 4th and 5th digits are 0 is not a valid SSN
 * A value where the last 4 digits are 0 is not a valid SSN
 * A value with 3 digits, an optional -, 2 digits, an optional -, and 4 digits is a valid SSN
 * 9 of the same digits (e.g., '111111111') is not a valid SSN
 */
export declare const isValidSSN: <T>(ssnString: T, props: FieldProps<T>) => ValidationFunctionResult<T>;