queue_push_back.js

const queue = new PromiseQueue();
const anotherTask = () => { /* do something fancy */ };
const errorTask = () => { /* do something fancy */ };

const myApiCall1 = () => Promise.resolve()
  .then(() => { queue.push(anotherTask) })
  .catch(() => { queue.push(errorTask) })

queue.resolve().then((results) => {
    console.log(results);
}).catch((error) => {
    console.log(error);
});