/**
 * @file FileKnowledgeBase — 基于文件的知识库实现
 * @description 文档分块 + embedding 存储（data/kb/），实现 KnowledgeBase 接口
 */
import type { KnowledgeBase, TextChunk, SearchResult, DocMeta, EmbeddingProvider } from '@cicctencent/agent-core';
/**
 * 基于文件的知识库实现
 * - 文档元数据存储在 data/kb/docs.json
 * - 文本块存储在 data/kb/chunks.json
 * - 搜索：有 embedding 时用余弦相似度，无时用 TF-IDF 关键词匹配
 */
export declare class FileKnowledgeBase implements KnowledgeBase {
    private docStore;
    private chunkStore;
    private embeddingProvider?;
    constructor(options?: {
        embeddingProvider?: EmbeddingProvider;
    });
    ingest(docId: string, chunks: TextChunk[]): Promise<void>;
    search(query: string, topK?: number): Promise<SearchResult[]>;
    remove(docId: string): Promise<void>;
    list(): Promise<DocMeta[]>;
    private toTextChunk;
}
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