import { IVectorIndexClient } from "@gomomento/sdk-core";
import { Document } from "@langchain/core/documents";
import type { EmbeddingsInterface } from "@langchain/core/embeddings";
import { MaxMarginalRelevanceSearchOptions, VectorStore } from "@langchain/core/vectorstores";
export interface DocumentProps {
    ids: string[];
}
export interface MomentoVectorIndexLibArgs {
    /**
     * The Momento Vector Index client.
     */
    client: IVectorIndexClient;
    /**
     * The name of the index to use to store the data.
     * Defaults to "default".
     */
    indexName?: string;
    /**
     * The name of the metadata field to use to store the text of the document.
     * Defaults to "text".
     */
    textField?: string;
    /**
     * Whether to create the index if it does not already exist.
     * Defaults to true.
     */
    ensureIndexExists?: boolean;
}
export interface DeleteProps {
    /**
     * The ids of the documents to delete.
     */
    ids: string[];
}
/**
 * A vector store that uses the Momento Vector Index.
 *
 * @remarks
 * To sign up for a free Momento account, visit https://console.gomomento.com.
 */
export declare class MomentoVectorIndex extends VectorStore {
    private client;
    private indexName;
    private textField;
    private _ensureIndexExists;
    _vectorstoreType(): string;
    /**
     * Creates a new `MomentoVectorIndex` instance.
     * @param embeddings The embeddings instance to use to generate embeddings from documents.
     * @param args The arguments to use to configure the vector store.
     */
    constructor(embeddings: EmbeddingsInterface, args: MomentoVectorIndexLibArgs);
    /**
     * Returns the Momento Vector Index client.
     * @returns The Momento Vector Index client.
     */
    getClient(): IVectorIndexClient;
    /**
     * Creates the index if it does not already exist.
     * @param numDimensions The number of dimensions of the vectors to be stored in the index.
     * @returns Promise that resolves to true if the index was created, false if it already existed.
     */
    private ensureIndexExists;
    /**
     * Converts the documents to a format that can be stored in the index.
     *
     * This is necessary because the Momento Vector Index requires that the metadata
     * be a map of strings to strings.
     * @param vectors The vectors to convert.
     * @param documents The documents to convert.
     * @param ids The ids to convert.
     * @returns The converted documents.
     */
    private prepareItemBatch;
    /**
     * Adds vectors to the index.
     *
     * @remarks If the index does not already exist, it will be created if `ensureIndexExists` is true.
     * @param vectors The vectors to add to the index.
     * @param documents The documents to add to the index.
     * @param documentProps The properties of the documents to add to the index, specifically the ids.
     * @returns Promise that resolves when the vectors have been added to the index. Also returns the ids of the
     * documents that were added.
     */
    addVectors(vectors: number[][], documents: Document<Record<string, any>>[], documentProps?: DocumentProps): Promise<void | string[]>;
    /**
     * Adds vectors to the index. Generates embeddings from the documents
     * using the `Embeddings` instance passed to the constructor.
     * @param documents Array of `Document` instances to be added to the index.
     * @returns Promise that resolves when the documents have been added to the index.
     */
    addDocuments(documents: Document[], documentProps?: DocumentProps): Promise<void>;
    /**
     * Deletes vectors from the index by id.
     * @param params The parameters to use to delete the vectors, specifically the ids.
     */
    delete(params: DeleteProps): Promise<void>;
    /**
     * Searches the index for the most similar vectors to the query vector.
     * @param query The query vector.
     * @param k The number of results to return.
     * @returns Promise that resolves to the documents of the most similar vectors
     * to the query vector.
     */
    similaritySearchVectorWithScore(query: number[], k: number): Promise<[Document<Record<string, any>>, number][]>;
    /**
     * Return documents selected using the maximal marginal relevance.
     * Maximal marginal relevance optimizes for similarity to the query AND diversity
     * among selected documents.
     *
     * @param {string} query - Text to look up documents similar to.
     * @param {number} options.k - Number of documents to return.
     * @param {number} options.fetchK - Number of documents to fetch before passing to the MMR algorithm.
     * @param {number} options.lambda - Number between 0 and 1 that determines the degree of diversity among the results,
     *                 where 0 corresponds to maximum diversity and 1 to minimum diversity.
     * @param {this["FilterType"]} options.filter - Optional filter
     * @param _callbacks
     *
     * @returns {Promise<Document[]>} - List of documents selected by maximal marginal relevance.
     */
    maxMarginalRelevanceSearch(query: string, options: MaxMarginalRelevanceSearchOptions<this["FilterType"]>): Promise<Document[]>;
    /**
     * Stores the documents in the index.
     *
     * Converts the documents to vectors using the `Embeddings` instance passed.
     * @param texts The texts to store in the index.
     * @param metadatas The metadata to store in the index.
     * @param embeddings The embeddings instance to use to generate embeddings from the documents.
     * @param dbConfig The configuration to use to instantiate the vector store.
     * @param documentProps The properties of the documents to add to the index, specifically the ids.
     * @returns Promise that resolves to the vector store.
     */
    static fromTexts(texts: string[], metadatas: object[] | object, embeddings: EmbeddingsInterface, dbConfig: MomentoVectorIndexLibArgs, documentProps?: DocumentProps): Promise<MomentoVectorIndex>;
    /**
     * Stores the documents in the index.
     * @param docs The documents to store in the index.
     * @param embeddings The embeddings instance to use to generate embeddings from the documents.
     * @param dbConfig The configuration to use to instantiate the vector store.
     * @param documentProps The properties of the documents to add to the index, specifically the ids.
     * @returns Promise that resolves to the vector store.
     */
    static fromDocuments(docs: Document[], embeddings: EmbeddingsInterface, dbConfig: MomentoVectorIndexLibArgs, documentProps?: DocumentProps): Promise<MomentoVectorIndex>;
}