Promise pyramid of doom

promise-pyramid-of-doom.js

export function bookApartment(req, res, next) {
  booking
    .create(req.booking)
    .then(function(data){
        notifier.sendBookingConfirmation(data)
        .then(function(result){
          statistics.log(data) 
          .then(function(result){
            log.debug('booking-succeeded');
          })
          .catch(function(err){
            next(err);
          });
        })
        .catch(function(err){
          next(err);
        });
    })
    .then(function(){ 
      res.send(200);
    })
    .catch(function(err) {
        next(err);
    });
}