import { BaseRetriever, type BaseRetrieverInput } from "@langchain/core/retrievers";
import { AsyncCaller, type AsyncCallerParams } from "@langchain/core/utils/async_caller";
import type { DocumentInterface } from "@langchain/core/documents";
/**
 * Type for the authentication method used by the RemoteRetriever. It can
 * either be false (no authentication) or an object with a bearer token.
 */
export type RemoteRetrieverAuth = false | {
    bearer: string;
};
/**
 * Type for the JSON response values from the remote server.
 */
export type RemoteRetrieverValues = Record<string, any>;
/**
 * Interface for the parameters required to initialize a RemoteRetriever
 * instance.
 */
export interface RemoteRetrieverParams extends AsyncCallerParams, BaseRetrieverInput {
    /**
     * The URL of the remote retriever server
     */
    url: string;
    /**
     * The authentication method to use, currently implemented is
     * - false: no authentication
     * - { bearer: string }: Bearer token authentication
     */
    auth: RemoteRetrieverAuth;
}
/**
 * Abstract class for interacting with a remote server to retrieve
 * relevant documents based on a given query.
 */
export declare abstract class RemoteRetriever extends BaseRetriever implements RemoteRetrieverParams {
    get lc_secrets(): {
        [key: string]: string;
    } | undefined;
    url: string;
    auth: RemoteRetrieverAuth;
    headers: Record<string, string>;
    asyncCaller: AsyncCaller;
    constructor(fields: RemoteRetrieverParams);
    /**
     * Abstract method that should be implemented by subclasses to create the
     * JSON body of the request based on the given query.
     * @param query The query based on which the JSON body of the request is created.
     * @returns The JSON body of the request.
     */
    abstract createJsonBody(query: string): RemoteRetrieverValues;
    /**
     * Abstract method that should be implemented by subclasses to process the
     * JSON response from the server and convert it into an array of Document
     * instances.
     * @param json The JSON response from the server.
     * @returns An array of Document instances.
     */
    abstract processJsonResponse(json: RemoteRetrieverValues): DocumentInterface[];
    _getRelevantDocuments(query: string): Promise<DocumentInterface[]>;
}