export interface SemanticCacheConfig {
    strategy: "exact" | "semantic";
    /** Cosine similarity threshold for semantic cache hits. Defaults to 0.95. */
    similarityThreshold?: number;
    /** Max cache size in MB (in-memory LRU). Defaults to 500. */
    maxSizeMB?: number;
    /** Persistence backend. Defaults to "memory". */
    persistence?: "memory" | "sqlite";
    /** Path to SQLite database file. Defaults to ".rag-embedding-cache.db". */
    sqlitePath?: string;
}
export declare class SemanticCache {
    private readonly config;
    /** In-memory LRU store: key → embedding */
    private readonly lru;
    /** Semantic store: [embedding, originalKey][] for cosine comparison */
    private semantic;
    private db;
    private dbReady;
    constructor(config: SemanticCacheConfig);
    get(text: string, embed: (t: string) => Promise<number[]>): Promise<number[] | null>;
    set(text: string, embedding: number[]): Promise<void>;
    private lruPut;
    private initDb;
    private dbGet;
    private dbSet;
}
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