/**
 * AdvancedBilling
 *
 * This file was automatically generated for Maxio by APIMATIC v3.0 ( https://www.apimatic.io ).
 */
import { Schema } from '../../schema';
/** This is a container type for one-of types. */
export type MetafieldEnum = string | string[];
export declare const metafieldEnumSchema: Schema<MetafieldEnum>;
export declare namespace MetafieldEnum {
    /**
     * Validation method to narrow down union type to string type case.
     *
     * This is String case.
     */
    function isString(value: unknown): value is string;
    /**
     * Validation method to narrow down union type to string[] type case.
     *
     * This is Array of String case.
     */
    function isArrayOfString(value: unknown): value is string[];
}