trying to avoid a nested promise and a callback

app.js

thisReturnsAPromise().then(function(val) {
  if (something) {
    anotherPromiseReturningFn(val.property).then(function() {
      callback();
    });
  } else {
    callback();
  }
});

function callback() {
  doStuff();
}

thisReturnsAPromise().then(function(val) {
    if(something) return anotherPromiseReturningFn(val.property);
}).then(doStuff);