Promise who return nothing

I'm trying to use the transaction class from the mssql package of nodejs. So as i read on http://www.dotnetcurry.com/nodejs/1238/connect-sql-server-nodejs-mssql-package, i did the following :

Db.prototype.transaction = function() {
  return new Promise((resolve, reject) => {
    pool.connect().then(conn => {
      let transaction = new mssql.Transaction(conn).begin().then(() => {
        new mssql.Request(transaction).query("SELECT * FROM ParkingSlot").then(() => {
          transaction.commit().then((recordset) => {
            conn.close();
            resolve(recordset);
          }).catch(reject)
        }).catch(reject);
      }).catch(reject)
    });
  });
};

On the caller function, i did db.transaction().then(console.dir); to output any result one console. But nothing happen.

via Little squirrel