import type { StalierOptions, StalierResult } from './stalier.types';
/**
 * stale while revalidate function
 * @example
 * const { data, status } = await withStaleWhileRevalidate(fn, {
 *   maxAge: 1,
 *   staleWhileRevalidate: 999,
 *   cacheKey: 'cacheKey',
 *   cacheProvider: redisClient,
 * });
 * @param fn - function to cache result from
 * @param options - options for stale while revalidate
 * @returns result of fn either from cache or from fn
 * @throws error only if fn throws error
 */
export declare function withStaleWhileRevalidate<T>(fn: () => Promise<T>, options: StalierOptions): Promise<StalierResult<T>>;