/**
 * A function that generates a cache key from method arguments.
 */
export type KeyGenerator = (...args: any[]) => string;
/**
 * LRU (Least Recently Used) cache decorator for methods.
 * Caches return values based on method arguments, evicting the oldest entry
 * when the cache reaches maxSize.
 *
 * @param maxSize - Maximum number of entries to keep in the cache.
 * @param keyGenerator - Optional custom function to generate cache keys from method arguments.
 */
export declare function LRUCache(maxSize?: number, keyGenerator?: KeyGenerator): (_target: any, _propertyKey: string, descriptor: PropertyDescriptor) => void;
/**
 * Clear the LRU cache associated with a decorated method.
 * @param target - The class (for static methods) or instance (for instance methods).
 * @param propertyKey - The method name.
 */
export declare function clearLRUCache(target: any, propertyKey: string): void;
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