What is an async thunk?

Async Thunk

It is a function that doesn't need any arguments passed to it to do it's job, except you need to pass it a callback so that you can get the value out.

function addAsync(x, y, cb) {
  setTimeout(function () {
    cb(x + y);
  }, 1000);
}

var thunk = function (cb) {
  return addAsync(10, 15, cb);
};

thunk(function (sum) {
  console.log(sum); // 25
});