import type { HierarchicalNSW as HierarchicalNSWT, SpaceName } from "hnswlib-node";
import type { EmbeddingsInterface } from "@langchain/core/embeddings";
import { SaveableVectorStore } from "@langchain/core/vectorstores";
import { Document } from "@langchain/core/documents";
import { SynchronousInMemoryDocstore } from "../stores/doc/in_memory.js";
/**
 * Interface for the base configuration of HNSWLib. It includes the space
 * name and the number of dimensions.
 */
export interface HNSWLibBase {
    space: SpaceName;
    numDimensions?: number;
}
/**
 * Interface for the arguments that can be passed to the HNSWLib
 * constructor. It extends HNSWLibBase and includes properties for the
 * document store and HNSW index.
 */
export interface HNSWLibArgs extends HNSWLibBase {
    docstore?: SynchronousInMemoryDocstore;
    index?: HierarchicalNSWT;
}
/**
 * Class that implements a vector store using Hierarchical Navigable Small
 * World (HNSW) graphs. It extends the SaveableVectorStore class and
 * provides methods for adding documents and vectors, performing
 * similarity searches, and saving and loading the vector store.
 */
export declare class HNSWLib extends SaveableVectorStore {
    FilterType: (doc: Document) => boolean;
    _index?: HierarchicalNSWT;
    docstore: SynchronousInMemoryDocstore;
    args: HNSWLibBase;
    _vectorstoreType(): string;
    constructor(embeddings: EmbeddingsInterface, args: HNSWLibArgs);
    /**
     * Method to add documents to the vector store. It first converts the
     * documents to vectors using the embeddings, then adds the vectors to the
     * vector store.
     * @param documents The documents to be added to the vector store.
     * @returns A Promise that resolves when the documents have been added.
     */
    addDocuments(documents: Document[]): Promise<void>;
    private static getHierarchicalNSW;
    private initIndex;
    get index(): HierarchicalNSWT;
    private set index(value);
    /**
     * Method to add vectors to the vector store. It first initializes the
     * index if it hasn't been initialized yet, then adds the vectors to the
     * index and the documents to the document store.
     * @param vectors The vectors to be added to the vector store.
     * @param documents The documents corresponding to the vectors.
     * @returns A Promise that resolves when the vectors and documents have been added.
     */
    addVectors(vectors: number[][], documents: Document[]): Promise<void>;
    /**
     * Method to perform a similarity search in the vector store using a query
     * vector. It returns the k most similar documents along with their
     * similarity scores. An optional filter function can be provided to
     * filter the documents.
     * @param query The query vector.
     * @param k The number of most similar documents to return.
     * @param filter An optional filter function to filter the documents.
     * @returns A Promise that resolves to an array of tuples, where each tuple contains a document and its similarity score.
     */
    similaritySearchVectorWithScore(query: number[], k: number, filter?: this["FilterType"]): Promise<[Document<Record<string, any>>, number][]>;
    /**
     * Method to delete the vector store from a directory. It deletes the
     * hnswlib.index file, the docstore.json file, and the args.json file from
     * the directory.
     * @param params An object with a directory property that specifies the directory from which to delete the vector store.
     * @returns A Promise that resolves when the vector store has been deleted.
     */
    delete(params: {
        directory: string;
    }): Promise<void>;
    /**
     * Method to save the vector store to a directory. It saves the HNSW
     * index, the arguments, and the document store to the directory.
     * @param directory The directory to which to save the vector store.
     * @returns A Promise that resolves when the vector store has been saved.
     */
    save(directory: string): Promise<void>;
    /**
     * Static method to load a vector store from a directory. It reads the
     * HNSW index, the arguments, and the document store from the directory,
     * then creates a new HNSWLib instance with these values.
     * @param directory The directory from which to load the vector store.
     * @param embeddings The embeddings to be used by the HNSWLib instance.
     * @returns A Promise that resolves to a new HNSWLib instance.
     */
    static load(directory: string, embeddings: EmbeddingsInterface): Promise<HNSWLib>;
    /**
     * Static method to create a new HNSWLib instance from texts and metadata.
     * It creates a new Document instance for each text and metadata, then
     * calls the fromDocuments method to create the HNSWLib instance.
     * @param texts The texts to be used to create the documents.
     * @param metadatas The metadata to be used to create the documents.
     * @param embeddings The embeddings to be used by the HNSWLib instance.
     * @param dbConfig An optional configuration object for the document store.
     * @returns A Promise that resolves to a new HNSWLib instance.
     */
    static fromTexts(texts: string[], metadatas: object[] | object, embeddings: EmbeddingsInterface, dbConfig?: {
        docstore?: SynchronousInMemoryDocstore;
    }): Promise<HNSWLib>;
    /**
     * Static method to create a new HNSWLib instance from documents. It
     * creates a new HNSWLib instance, adds the documents to it, then returns
     * the instance.
     * @param docs The documents to be added to the HNSWLib instance.
     * @param embeddings The embeddings to be used by the HNSWLib instance.
     * @param dbConfig An optional configuration object for the document store.
     * @returns A Promise that resolves to a new HNSWLib instance.
     */
    static fromDocuments(docs: Document[], embeddings: EmbeddingsInterface, dbConfig?: {
        docstore?: SynchronousInMemoryDocstore;
    }): Promise<HNSWLib>;
    static imports(): Promise<{
        HierarchicalNSW: typeof HierarchicalNSWT;
    }>;
}