api-surface.js

const sync = createSync({
  maxRetries: 3, 
  delayBetweenRetries: 2000,
  syncAction: api.syncEvent,
});

// success
sync.syncedItems.subscribe(x => console.log(x.item));

// failure 
sync.failedItems.subscribe(x => console.error(x.item));


function syncMouseEvent(event) {
  sync.queue({
    x: event.clientX,
    y: event.clientY
  });
}

function onConnectionDropped() {
  sync.pause();
}

function onConnectionResumed() {
  sync.resume();
}