/**
 * EmbeddingCache — LRU 缓存层
 * 包装任意 EmbeddingProvider，相同文本不重复调用。
 */
import type { EmbeddingProvider } from './embedding-provider.js';
export interface CacheStats {
    hits: number;
    misses: number;
    size: number;
    maxSize: number;
}
export declare class EmbeddingCache implements EmbeddingProvider {
    private readonly provider;
    private readonly maxSize;
    private readonly cache;
    private hits;
    private misses;
    constructor(provider: EmbeddingProvider, maxSize?: number);
    embed(text: string): Promise<number[]>;
    embedBatch(texts: string[]): Promise<number[][]>;
    dimensions(): number;
    modelId(): string;
    /** 清空缓存 */
    clear(): void;
    /** 缓存统计 */
    stats(): CacheStats;
    /** LRU get：命中时移到末尾（最近使用） */
    private get;
    /** LRU set：超出容量时淘汰最早的 */
    private set;
}
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