New way to wrap jQuery deferred object if you have no choice

deferredToPromise.js

new Promise((resolve, reject) => {
  existingAjaxLibraryWrapper.callAPI()
    .done(res => {
      resolve(res);
    })
    .fail(err => {
      reject(new Error("Oops!"));
    });
})
  .then(res => {
    // Do something with this
    // E.g. if you're using redux
    // dispatch(requestSuccess(res));
  })
  .catch(err => {
    // Do something with this error
    // E.g. if you're using redux
    // dispatch(requestFailed(err.message));
  });