/**
 * Creates a function that memoizes the result of `fn`.
 *
 * @example
 * const expensive = memoize((x: number) => x * 2);
 * expensive(5); // computes 10
 * expensive(5); // returns cached 10
 *
 * @param fn The function to memoize.
 * @param keyResolver Optional function to compute the cache key from arguments.
 * @returns The memoized function with a `.cache` property.
 */
export declare function memoize<T extends (...args: any[]) => any>(fn: T, keyResolver?: (...args: Parameters<T>) => string): T & {
    cache: Map<string, ReturnType<T>>;
};