promisifying transaction related functions of node mysql library

dbUtils.js

 getPromisifiedConnection(pool) {
    return util.promisify(pool.getConnection).bind(pool);
  }

  getPromisifiedBeginTransaction(connection) {
    return util.promisify(connection.beginTransaction.bind(connection));
  }

  getPromisifiedQuery(connection) {
    util.promisify((sql, options, cb) =>
      connection.query(sql, options, (err, results) => cb(err, results))
    );
  }

  getPromisifiedRollBack(connection) {
    util.promisify(connection.rollback.bind(connection));
  }
  getPromisifiedCommit(connection) {
    util.promisify(connection.commit.bind(connection));
  }
  async getPromisifiedDbFuncs(pool) {
    const getConnection = util.promisify(pool.getConnection).bind(pool);
    /** @type {import('mysql').PoolConnection}  */
    const connection = await getConnection().catch(
      /** @type  {import('mysql').MysqlError} */ err => errorLog.error(err)
    );
    if (!connection) throw new Error("could not get pool connection");

    //bindings are important.
    const beginTransactionPromise = util.promisify(
      connection.beginTransaction.bind(connection)
    );
    // const queryPromise = util.promisify(connection.query.bind(connection));
    const queryPromise = util.promisify((sql, options, cb) =>
      connection.query(sql, options, (err, results) => cb(err, results))
    );
    const rollBackPromise = util.promisify(
      connection.rollback.bind(connection)
    );
    const commitPromise = util.promisify(connection.commit.bind(connection));

    return {
      beginTransactionPromise,
      queryPromise,
      rollBackPromise,
      commitPromise,
      connection,
      pool
    };
  }