RobinDeBaets/pdfdownload.js

I think this script might be outdated with some new security permissions. You have to add a trusted script url assignment in order for your scripts url to be trusted. Some browsers might not support this struct of trusted script url; however, chrome does and this code I have pasted below is for chrome.

let pdfScript = document.createElement("script");
function rescale(width, height, fitWidth, fitHeight) {
    let ratio = width / height;
    let fitRatio = fitWidth / fitHeight;
    if (ratio <= fitRatio) {
        // Dimensions to fit are wider, fix the width
        return [width, width / fitRatio];
    } else {
        // Dimensions to fit are taller, fix the height
        return [height * fitRatio, height];
    }
}
function imageToBase64(img) {
    let canvas = document.createElement("canvas");
    let context = canvas.getContext("2d");
    canvas.width = img.naturalWidth;
    canvas.height = img.naturalHeight;
    context.drawImage(img, 0, 0, img.naturalWidth, img.naturalHeight);
    return canvas.toDataURL("image/png", 1.0);
}
pdfScript.onload = function () {
    try {
        let jsPDF = window.jspdf.jsPDF;
        let pdf = new jsPDF();
        let pdfWidth = pdf.internal.pageSize.getWidth();
        let pdfHeight = pdf.internal.pageSize.getHeight();
        let pdfRatio = pdfWidth / pdfHeight;
        let elements = document.getElementsByTagName("img");
        for (let img of elements) {
            if (!/^blob:/.test(img.src)) {
                continue;
            }
            console.log("adding image", img.src);
            let imgData = imageToBase64(img);
            let [newWidth, newHeight] = rescale(pdfWidth, pdfHeight, img.naturalWidth, img.naturalHeight);
            pdf.addImage(imgData, "png", 0, 0, newWidth, newHeight);
            pdf.addPage();
        }
        pdf.deletePage(pdf.internal.getNumberOfPages());
        pdf.save("download.pdf");
    } catch(e) {
        console.log(e);
    }
};

const myScriptPolicy = trustedTypes.createPolicy('my-script-policy', {
  createScriptURL: (url) => {
    return url; 
  }
});

const trustedUrl = myScriptPolicy.createScriptURL ('https://unpkg.com/jspdf@latest/dist/jspdf.umd.min.js');
pdfScript.src = trustedUrl;
document.body.appendChild(pdfScript);