Copy modified image from whatsapp-web's pre-send image editing canvas

wapp_image_copy.js

javascript: (function() {
    let cvs = document.querySelectorAll('.konvajs-content > canvas');
    let backup = cvs[0].toDataURL("image/png");
    let img = document.createElement("IMG");
    img.onload = () => {
        cvs[0].getContext("2d").drawImage(img, 0, 0);
        cvs[0].toBlob(blob => {
            navigator.clipboard.write([new ClipboardItem({
                "image/png": blob
            })]);
            alert("Image has been copied to Clipboard!");
        });
        img = document.createElement("IMG");
        img.onload = () => cvs[0].getContext("2d").drawImage(img, 0, 0);
        img.src = backup;
    };
    img.src = cvs[1].toDataURL("image/png");
})();