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 cb - The callback. Receives the CDN Helper as the first argument.
 * @param providedEvent - Optionally provide the request event if useRequestEvent() fails.
 * @param applyToEvent - Whether to apply the headers to the event. Defaults to false.
 */
export declare function useCDNHeaders(cb: (helper: NuxtMultiCacheCDNHelper) => void, providedEvent?: H3Event, applyToEvent?: boolean): void;