Hi Ludo, I got a minimal swc (attached in my previous mail) working. This minimal swc works for compiling typescript to javascript. But, I haven't figured out how to use it to build web components. This is blocking packaging mathjax v3, and thus calibre. I feel that if calibre can go ahead without mathjax v3, it should. Then, we can close this issue and open a separate one for web components and mathjax. Regards, Arun