8.10-generic-login.js

// Node.js v.8.10

module.exports.login = (event, context) => {
  return connectToDatabase() // returning promise! :)
    .then(() =>
      login(JSON.parse(event.body)) // promise
    )
    .then(session => ({ // resolving the promise to an object
      statusCode: 200,
      body: JSON.stringify(session)
    }))
    .catch(err => ({ // or rejecting with an error
      statusCode: 500,
      body: JSON.stringify(err)
    }));
};