Window: queueMicrotask() method - Web APIs

Window: queueMicrotask() method - Web APIs | MDN

Syntax

queueMicrotask(callback)

Parameters

callback: A function to be executed when the browser engine determines it is safe to call your code. Enqueued microtasks are executed after all pending tasks have completed but before yielding control to the browser's event loop.

Return value

None (undefined).

Examples

queueMicrotask(() => {
  // function contents here
});

Taken from the queueMicrotask spec:

MyElement.prototype.loadData = function (url) {
  if (this._cache[url]) {
    queueMicrotask(() => {
      this._setData(this._cache[url]);
      this.dispatchEvent(new Event("load"));
    });
  } else {
    fetch(url)
      .then((res) => res.arrayBuffer())
      .then((data) => {
        this._cache[url] = data;
        this._setData(data);
        this.dispatchEvent(new Event("load"));
      });
  }
};