import { CustomAmountData } from '../services/gift-card-checkout-service.js';
/**
 * Validates if the custom amount is within the allowed range.
 */
export declare function validateCustomAmount(amount: number, customAmountData: CustomAmountData): boolean;
/**
 * Validates if an email address is valid using a simple regex pattern.
 */
export declare function validateEmail(email: string): boolean;