/**
 * Creates a memoized version of an async function with a custom cache key generator.
 * Only successful results are cached - rejected promises are not remembered.
 *
 * @param fn - The async function to memoize
 * @param getCacheKey - Function that generates a cache key from the function arguments
 * @returns Object with the memoized function and cache clearing capability
 */
export declare function memoize<TArgs extends unknown[], TReturn>(fn: (...args: TArgs) => Promise<TReturn>, getCacheKey: (...args: TArgs) => string): {
    fn: (...args: TArgs) => Promise<TReturn>;
    clearCache: () => void;
    clearCacheEntry: (...args: TArgs) => void;
};