import { EuropeanMemberState } from './interfaces.js';
/**
 * Validates and normalizes input parameters
 *
 * @param country - Country code (will be normalized to uppercase)
 * @param vatNumber - VAT number (will be normalized by removing spaces/separators)
 * @returns Normalized and validated inputs
 * @throws {ViesError} If inputs are invalid
 */
export declare function validateInput(country: string, vatNumber: string): {
    country: EuropeanMemberState;
    vatNumber: string;
};