Proper way of html/css parsing & write local files?

Hello, nice to meet the community!
I need some starter instructions for building a plugin for exporting componentSets to custom JS/CSS with automation.

1. Proper way of parsing nodes to html/css
   Since I couldn’t found an function for this, do i have to traverse the nodes’ tree manually for desired output; or setup a node project reprocessing JSON file got from figma REST API?
   Does anyone know any existing open projects could show one or two things for parsing nodes to html/css properly?

2. Writing to local file with Figma API
   Is there a figma API that could directly write file to local machine? I mean text files such html/css.
   exportAsync seems only for svg/png/pdf.
   Browser API doesn’t seem to work, and copy from console.log is not quite a filnal solution 🙂
   Thanks!