const { imageHelpers } = window.canva;
const canva = window.canva.init();
​
canva.onReady(async (opts) => {
  // Convert a CanvaElement into a CanvaImageBlob
  const image = await imageHelpers.fromElement(opts.element);
​
  // Convert the CanvaImageBlob into a data URL
  const dataUrl = await imageHelpers.toDataUrl(image);
​
  // Do something with the result
  console.log(dataUrl);
});