Is there a tutorial for writing goldmark extensions?

[j2kun]

I see lots of examples but I am looking for an explanation of what is needed to implement a basic goldmark extension, such as a parser extension.

[maaz-munir]

yea something like a guide would be really useful!

[j2kun]

I ended up having to teach myself while writing this one: https://github.com/j2kun/hugo-goldmark-extensions/tree/main/passthrough

Unfortunately I had to implement it a few times because my initial attempts didn't work properly with goldmark's internals