Trying to add jspdf library in magento2

Magento noob here.

I have been trying to add jspdf library in magento2 and have followed following few answers in magento stackexchange. Still the constructor jsPDF() is shown as undefined.

https://magento.stackexchange.com/questions/330020/magento-2-include-js-library-without-require-js

https://magento.stackexchange.com/questions/237275/how-to-add-js-library-to-magento-2

https://magento.stackexchange.com/questions/300838/non-amd-module-jspdf-magento-2

I need to convert html content to pdf and I have tried to implement the jspdf library which are cdn links in html and it is working fine in that case.

https://cdnjs.cloudflare.com/ajax/libs/html2canvas/1.3.2/html2canvas.min.js

https://cdnjs.cloudflare.com/ajax/libs/jspdf/2.5.1/jspdf.umd.min.js

I have saved the above two links as separate js file so it can work on magento2 but the constructor error keeps showing.