How to create a submodule in the rust code?

[CMCDragonkai]

If I stick code into Rust modules, then use mod x, all of it gets exported at a top level. What's the right way to expose a submodule in JS? So I have to do native.x.f?

[Brooooooklyn]

you can add #[napi] to Rust mod:

#[napi]
pub fn foo() {}

#[napi(js_name = "bar")]
pub mod Bar {
  #[napi]
  pub fn baz() {}
}

[CMCDragonkai]

Does this work with just mod filename? That is my definitions are located in separate file. With lib.rs referencing them with mod filename.

[Brooooooklyn]

no, it doesn't work with mod filename

[CMCDragonkai]

So there's no way to export a module that sits in a separate file?

[Brooooooklyn]

Yes... supporting this feature would make code generation very complex (already complex for now). You can create JavaScript files for this purpose: https://github.com/Brooooooklyn/lzma/blob/main/lzma2.js