Accessing the backend source code for exporting PDF

[Master2IT]

Hi, do you know how I can access the backend for exporting PDF?
I need to import my shapes, and when I try to export as PDF, I can't see my shapes in the PDF.
Or help me find out how can I convert the XML to PDF?
https://convert.diagrams.net/node/export

[davidjgraph]

https://github.com/jgraph/draw-image-export2 is the server-side part you need for PDF generation.