I've done this too, but what I e learned is that many libraries have really inflexible APIs or are written to only handle very basic cases. Like, if your parser

I've done this too, but what I e learned is that many libraries have really inflexible APIs or are written to only handle very basic cases. Like, if your parser builds an AST internally, would it kill library devs to expose that AST or the functions that manipulate it? It's not like that's never a thing, but it amazes me how common it is for library code to be written like developers will never want different behavior. This is what has made writing things like static site generators more time consuming for me than it should be.