bluebird-monadic.js

Bluebird.prototype.flatThen = function (promise, transform) {
  return new Bluebird(function (resolve, reject) {
    promise
      .then(function (value1) {
        transform(value1)
          .then(function (value2) {
            resolve(value2);
          })
          .catch(function (err2) {
            reject(err2);
          });
      })
      .catch(function (err1) {
        reject(err1);
      });
  });
};