/**
 * LRU Cache for search results
 * Improves search performance by caching common queries
 */
export interface CacheEntry<T> {
    value: T;
    timestamp: number;
    hits: number;
}
export interface CacheStats {
    size: number;
    maxSize: number;
    hits: number;
    misses: number;
    hitRate: number;
}
/**
 * LRU (Least Recently Used) Cache
 * Automatically evicts least recently used entries when full
 */
export declare class LRUCache<T> {
    private cache;
    private maxSize;
    private ttl;
    private hits;
    private misses;
    constructor(maxSize?: number, ttlMinutes?: number);
    /**
     * Get value from cache
     */
    get(key: string): T | undefined;
    /**
     * Set value in cache
     */
    set(key: string, value: T): void;
    /**
     * Clear all cache entries
     */
    clear(): void;
    /**
     * Invalidate cache (clear all entries)
     * Call this when the index is updated
     */
    invalidate(): void;
    /**
     * Get cache statistics
     */
    stats(): CacheStats;
    /**
     * Remove expired entries
     */
    cleanup(): void;
}
/**
 * Create a cache key from search parameters
 */
export declare function createCacheKey(query: string, options?: {
    limit?: number;
    fileExtensions?: string[];
    pathFilter?: string;
    excludePaths?: string[];
}): string;
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