import { MongoClient, MongoClientOptions } from "mongodb";
import { SessionStore } from "./types";
interface NewClientOpts {
    /** MongoDB connection URL; required. */
    url: string;
    /**
     * MongoDB MongoClientOptions.
     *
     * Remember to install the db driver `'mongodb'`.
     *
     * @see {@link https://www.mongodb.com/docs/drivers/node/current/fundamentals/connection/connection-options MongoDB | Connection Options}
     * */
    config?: MongoClientOptions;
    /** The name of the database we want to use. If not provided, database name will be taken from connection string. */
    database?: string;
    /** MongoDB collection name to use for sessions. Defaults to "telegraf-sessions". */
    collection?: string;
    /** Called on fatal connection or setup errors */
    onInitError?: (err: unknown) => void;
}
interface ExistingClientOpts {
    /** If passed, we'll reuse this client instead of creating our own. */
    client: MongoClient;
    /** The name of the database we want to use. If not provided, database name will be taken from connection string. */
    database?: string;
    /** MongoDB collection name to use for sessions. Defaults to "telegraf-sessions". */
    collection?: string;
    /** Called on fatal connection or setup errors */
    onInitError?: (err: unknown) => void;
}
/** @unstable */
export declare function Mongo<Session>(opts: NewClientOpts): SessionStore<Session>;
export declare function Mongo<Session>(opts: ExistingClientOpts): SessionStore<Session>;
export {};