export interface CacheEntry {
    key: string;
    value: string;
    createdAt: number;
    ttlMs: number;
    hits: number;
}
export interface CacheConfig {
    enabled: boolean;
    ttlMs: number;
    maxEntries: number;
    dataDir: string;
}
export declare class LLMCache {
    private cache;
    private config;
    private filePath;
    private stats;
    constructor(config?: Partial<CacheConfig>);
    private load;
    private save;
    private isExpired;
    /**
     * Generate a cache key from messages and system prompt.
     */
    static makeKey(messages: Array<{
        role: string;
        content: string;
    }>, systemPrompt?: string): string;
    /**
     * Get a cached response. Returns null if not found or expired.
     */
    get(key: string): string | null;
    /**
     * Set a cached response.
     */
    set(key: string, value: string, ttlMs?: number): void;
    getStats(): {
        hits: number;
        misses: number;
        evictions: number;
        size: number;
        hitRate: string;
    };
    clear(): void;
}
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