Async

const dbConnection = new Promise((resolve, reject) => setTimeout(() => resolve(true), 500))

const myFunction = async (req, res) => {
  try {
     const result = await dbConnection();
      // do something with result
   } catch (e) {
     console.error(e)
   }
}

module.exports = async (req, res) => {
  blah blah
}