/**
 * The most commonly used EAN standard is
 * the thirteen-digit EAN-13, while the
 * less commonly used 8-digit EAN-8 barcode was
 * introduced for use on small packages.
 * Also EAN/UCC-14 is used for Grouping of individual
 * trade items above unit level(Intermediate, Carton or Pallet).
 * For more info about EAN-14 checkout: https://www.gtin.info/itf-14-barcodes/
 * EAN consists of:
 * GS1 prefix, manufacturer code, product code and check digit
 * Reference: https://en.wikipedia.org/wiki/International_Article_Number
 * Reference: https://www.gtin.info/
 */
import { MessageFunctionType, Result } from '../types';
export interface IsEANErrors {
    TARGET_ARGUMENT_NOT_A_STRING: MessageFunctionType;
}
export declare const IS_EAN_ERRORS: IsEANErrors;
/**
 * Test if string is valid EAN:
 * Matches EAN-8/EAN-13 regex
 * Has valid check digit.
 *
 *
 * ### Example
 * ```
 * expect(isEAN('9421023610112').value).toBeTruthy()
 * ```
 *
 * @param target The target
 */
export declare function isEAN(target: string): Result<boolean | undefined>;