Function parse 

pub fn parse(
    paths: &[impl AsRef<Path>],
    lib_name: Option<&str>,
) -> Result<(Module, GlobalContext)>

Parse .d.ts files and return the module + global context.

Diagnostics are collected on GlobalContext.diagnostics — callers should inspect or display them as needed (e.g., ctx.diagnostics.emit()).

External type mappings can be configured on the returned GlobalContext before passing it to codegen::generate.