import type { UnifiedResponse } from './providers/types.js';
export interface CacheKeyInput {
    model: string;
    systemPrompt: string;
    messages: Array<{
        role: string;
        content: string;
    }>;
}
export declare function generateCacheKey(input: CacheKeyInput): string;
export declare class ResponseCache {
    private db;
    private ttlMs;
    private enabled;
    constructor(ttlMs?: number, enabled?: boolean);
    private ensureDb;
    get(key: string): UnifiedResponse | null;
    set(key: string, response: UnifiedResponse, model: string): void;
    evictExpired(): number;
    clear(): void;
    stats(): {
        entries: number;
        totalHits: number;
        oldestMs: number;
    };
    close(): void;
}
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