/**
 * Apple Pay contact validation helpers.
 * Ported from sma-checkout — helpers/contact-validation.ts
 *
 * pushFieldError / pushRequiredFieldError also fire TEDL analytics per field.
 */
import ApplePayErrorContactField = ApplePayJS.ApplePayErrorContactField;
/**
 * Appends an ApplePayError to the error accumulator and fires a TEDL analytics
 * event for the failing field. Returns '' so it can be used inline with ||.
 */
export declare const pushFieldError: (errors: ApplePayError[], billingOrShippingContact: "billing" | "shipping" | undefined, field: ApplePayErrorContactField, errorType: "required" | "format" | "not-supported", errorText: string) => string;
/**
 * Convenience wrapper for required-field errors.
 * Uses the standard 'Missing required field' message — matches sma-checkout exactly.
 */
export declare const pushRequiredFieldError: (errors: ApplePayError[], billingOrShippingContact: "billing" | "shipping" | undefined, field: ApplePayErrorContactField) => string;
export declare class ContactValidationError extends Error {
    errors: ApplePayError[];
    constructor(errors: ApplePayError[]);
}