import { type H3Event } from 'h3';
import type { MultiCacheInstances } from './../types/index.js';
import type { CacheTagRegistry } from './../types/CacheTagRegistry.js';
import type { NuxtMultiCacheRouteCacheHelper } from './RouteCacheHelper.js';
export declare const MULTI_CACHE_CONTEXT_KEY = "multiCacheApp";
/**
 * Granular check whether caching is enabled for a given request.
 *
 * That way it's possible to exclude some requests from getting or setting
 * something from cache.
 */
export declare function enabledForRequest(event: H3Event): Promise<boolean>;
export declare function getMultiCacheContext(event: H3Event): MultiCacheInstances | undefined;
export declare function getCacheTagRegistry(event: H3Event): CacheTagRegistry | undefined;
export declare function getMultiCacheRouteHelper(event: H3Event): NuxtMultiCacheRouteCacheHelper | undefined;
export declare function getCacheKeyWithPrefix(cacheKey: string, event: H3Event): Promise<string>;
export declare function getRequestTimestamp(event: H3Event): number;
/**
 * Unstorage does some magic to the key if it contains / or ?. This method
 * handles this.
 */
export declare function encodeRouteCacheKey(event: H3Event): string;
export declare function isInternalServerRequest(event: H3Event): boolean;
/**
 * Filter out duplicate array items.
 */
export declare function onlyUnique(value: string, index: number, self: Array<string>): boolean;