/**
 * Agentic QE v3 - Embedding Cache
 * LRU cache for embeddings with content hash-based deduplication
 */
import { EmbeddingCacheEntry, CacheStats } from './types';
/**
 * Embedding cache with LRU eviction policy
 */
export declare class EmbeddingCache {
    private cache;
    private maxSize;
    private hits;
    private misses;
    constructor(maxSize?: number);
    /**
     * Generate SHA-256 hash of content for cache key
     */
    private hashContent;
    /**
     * Get cached embedding if available
     */
    get(content: string, model: string): number[] | null;
    /**
     * Store embedding in cache
     */
    set(content: string, model: string, embedding: number[]): void;
    /**
     * Check if embedding exists in cache
     */
    has(content: string, model: string): boolean;
    /**
     * Get cache statistics
     */
    getStats(): CacheStats;
    /**
     * Clear all cached embeddings
     */
    clear(): void;
    /**
     * Remove entries older than specified age
     */
    evictOlderThan(ageMs: number): number;
    /**
     * Get memory usage estimate in bytes
     */
    getMemoryUsageEstimate(): number;
    /**
     * Export cache for persistence
     */
    export(): Array<{
        key: string;
        entry: EmbeddingCacheEntry;
    }>;
    /**
     * Import cache from persistence
     */
    import(data: Array<{
        key: string;
        entry: EmbeddingCacheEntry;
    }>): void;
}
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