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declare module 'mongoose' {  import mongodb = require('mongodb');
  type ClientSessionOptions = mongodb.ClientSessionOptions;  type ClientSession = mongodb.ClientSession;
  /**   * _Requires MongoDB >= 3.6.0._ Starts a [MongoDB session](https://docs.mongodb.com/manual/release-notes/3.6/#client-sessions)   * for benefits like causal consistency, [retryable writes](https://docs.mongodb.com/manual/core/retryable-writes/),   * and [transactions](http://thecodebarbarian.com/a-node-js-perspective-on-mongodb-4-transactions.html).   */  function startSession(options: ClientSessionOptions | undefined | null, callback: Callback<ClientSession>): void;  function startSession(callback: Callback<ClientSession>): void;  function startSession(options?: ClientSessionOptions): Promise<ClientSession>;
  interface SessionOperation {    /** Sets the session. Useful for [transactions](/docs/transactions.html). */    session(session: mongodb.ClientSession | null): this;  }
  interface SessionStarter {
    /**     * Starts a [MongoDB session](https://docs.mongodb.com/manual/release-notes/3.6/#client-sessions)     * for benefits like causal consistency, [retryable writes](https://docs.mongodb.com/manual/core/retryable-writes/),     * and [transactions](http://thecodebarbarian.com/a-node-js-perspective-on-mongodb-4-transactions.html).     */    startSession(options: ClientSessionOptions | undefined | null, callback: Callback<ClientSession>): void;    startSession(callback: Callback<ClientSession>): void;    startSession(options?: ClientSessionOptions): Promise<ClientSession>;  }
  interface SessionOption {    session?: ClientSession | null;  }}