let sign = false;
function flushQueue<T extends { update: Function }>(queue: Array<T>) {
  sign = true;
  Promise.resolve().then(() => {
    queue.forEach((target) => {
      target.update();
    });
    sign = false;
  });
}

let queue: Array<any> = [];
export default function nextTick<T extends { update: Function }>(target: T) {
  if (queue.indexOf(target) === -1) {
    queue.push(target);
  }
  if (!sign) {
    flushQueue(queue.splice(0));
  }
}