/**
 * Shape checks flows call in conditions (validateDigits, validatePhone, validateEmail). Pure; part of jsfe/helpers.
 */
/** Only digits, and between minDigits and maxDigits of them. */
export function validateDigits(input: any, minDigits: any, maxDigits: any): boolean;
/**
 * A US phone number (10 digits, or 11 starting with 1), or with acceptInternational any 11–15 digits. String() first:
 * a flow can hand over a number (an all-digit answer evaluated to Number).
 */
export function validatePhone(phone: any, acceptInternational?: boolean): boolean;
/** Something@something.tld, no spaces. */
export function validateEmail(email: any): boolean;
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