import type { H3Event } from 'h3';
import type { NuxtMultiCacheCDNHelper } from './../helpers/CDNHelper.js';
/**
 * Return the helper to be used for interacting with the CDN headers feature.
 *
 * The helper is provided via a callback, which is only called server side.
 * That way the entire code patch, incl. calling useCDNHeaders, is removed
 * from client bundles.
 *
 * @param providedEvent Must be provided if not in a Vue context (page, component). This is the case when using this inside defineEventHandler.
 */
export declare function useCDNHeaders(cb: (helper: NuxtMultiCacheCDNHelper) => void, providedEvent?: H3Event): void;