Use of `fetchLater` in an async way

fetch-later.js

const events = [];
let current_dequeue_end = 0;
function dequeue() {
  // Ready to process, will send all current events.
  current_dequeue_end = events.length;
  fetchLater(makeURL(events)).then(({activated}) => {
    if (activated) {
      // Success, remove processed sub-array from the array and reset the index.
      events.splice(0, current_deque_end);
      current_dequeue_end = 0;
    } else {
    // abort the previous fetchLater
    }
    
    // If more events were added while processing, process them now.
    if (current_dequeue_end != events.length) {
        dequeue();
    }
  }).catch(error => {
    // Quota error? handle
  });
}

function newEvent(event) {
  events.push(event);
  if (!current_dequeue_end)
      dequeue();
}
```