import { MessageFunctionType, Result } from '../types';
export interface IsPostalCodeErrors {
    TARGET_ARGUMENT_NOT_A_STRING: MessageFunctionType;
    INVALID_LOCALE: MessageFunctionType;
}
export declare const IS_POSTAL_CODE_ERRORS: IsPostalCodeErrors;
export declare const postalCodeLocales: string[];
/**
 * Checks whether the `target` string is a valid postal code
 *
 * ### Example
 * ```
 * expect(isPostalCode().value).toBeTruthy()
 * ```
 * @param target The target string
 * @param locale The locale
 */
export declare function isPostalCode(target: string, locale: string): Result<boolean | undefined>;