prefetchImageSize.js

const preFetchImageSize = (url, checkInterval = 10) => new Promise((resolve, reject) => {
  const image = new Image();

  image.src = url;
  image.onerror = reject;

  const interval = setInterval(() => {
    if (image.width + image.naturalWidth) {
      clearInterval(interval);
      resolve({
        width: image.naturalWidth || image.width,
        height: image.naturalHeight || image.height,
      });
      image.src = '';
    }
  }, checkInterval);
});

preFetchImageSize('https://i.imgur.com/xFnVjMV.jpg')
  .then(console.log)
  .catch(console.error);