/**
 * Embedding Cache - LRU cache for embeddings (Feature 4)
 *
 * Saves OpenAI API costs by caching computed embeddings
 */
export interface CacheEntry {
    textEmbedding: Float32Array;
    diffEmbedding: Float32Array;
    cachedAt: number;
}
/**
 * LRU (Least Recently Used) cache for embeddings
 */
export declare class EmbeddingCache {
    private cache;
    private maxSize;
    private hits;
    private misses;
    constructor(maxSize?: number);
    /**
     * Generate cache key from PR content
     */
    private generateKey;
    /**
     * Get cached embeddings if available
     */
    get(title: string, description: string, diff: string): CacheEntry | null;
    /**
     * Store embeddings in cache
     */
    set(title: string, description: string, diff: string, textEmbedding: Float32Array, diffEmbedding: Float32Array): void;
    /**
     * Get cache statistics
     */
    getStats(): {
        size: number;
        maxSize: number;
        hits: number;
        misses: number;
        hitRate: number;
    };
    /**
     * Clear the cache
     */
    clear(): void;
    /**
     * Export cache for persistence
     */
    export(): {
        entries: Array<{
            key: string;
            entry: {
                textEmbedding: number[];
                diffEmbedding: number[];
                cachedAt: number;
            };
        }>;
    };
    /**
     * Import cache from persistence
     */
    import(data: {
        entries: Array<{
            key: string;
            entry: {
                textEmbedding: number[];
                diffEmbedding: number[];
                cachedAt: number;
            };
        }>;
    }): void;
}
/**
 * Create a caching wrapper around any embedder.
 * Caches individual embedText and embedDiff calls by their input text.
 */
export declare function withCache<T extends {
    embedText: (text: string) => Promise<Float32Array>;
    embedDiff: (diff: string) => Promise<Float32Array>;
}>(embedder: T, cacheSize?: number): T & {
    cache: EmbeddingCache;
};
//# sourceMappingURL=embeddingCache.d.ts.map