import type { Writable } from 'node:stream';
import CacheHandler from 'undici/types/cache-interceptor';
import CacheStore = CacheHandler.CacheStore;
/**
 * A wrapper around a cache store that adds the `x-comunica-cache: HIT` header to cached responses.
 */
export declare class MetadataWrappingCacheStore implements CacheStore {
    private readonly cacheStore;
    constructor(cacheStore: CacheStore);
    get(key: CacheHandler.CacheKey): Promise<CacheHandler.GetResult | undefined>;
    createWriteStream(key: CacheHandler.CacheKey, val: CacheHandler.CacheValue): Writable | undefined;
    delete(key: CacheHandler.CacheKey): void | Promise<void>;
}