[bug] exported function has incorrect signature

[naskya]

Problem

napi-exported functions can have incorrect signatures.

Example

https://github.com/naskya/napi-rs-sig-example

Setup

src
├── bar.rs
├── foo.rs
└── lib.rs

/// bar.rs
#[napi_derive::napi(object, js_name = "Bar")]
pub struct Thing {
    pub id: u32,
}

/// foo.rs
#[napi_derive::napi(object, js_name = "Foo")]
pub struct Thing {
    pub name: String,
}

/// lib.rs
pub mod bar;
pub mod foo;

#[napi_derive::napi]
pub fn do_something(bar: bar::Thing) {}

Expected behavior

doSomething should take Bar as an argument.

export interface Bar {
  id: number
}
export interface Foo {
  name: string
}
export function doSomething(bar: Bar): void

Actual behavior

doSomething takes Foo instead of Bar.

export interface Bar {
  id: number
}
export interface Foo {
  name: string
}
export function doSomething(bar: Foo): void

Workaround 1

In this particular case, napi-rs generates the correct function if you swap pub mod foo; and pub mod bar; in lib.rs

/// lib.rs
pub mod foo;
pub mod bar;

#[napi_derive::napi]
pub fn do_something(bar: bar::Thing) {}

export interface Foo {
  name: string
}
export interface Bar {
  id: number
}
export function doSomething(bar: Bar): void

Workaround 2

Give it a type alias.

/// lib.rs
pub mod bar;
pub mod foo;

type Bar = bar::Thing;

#[napi_derive::napi]
pub fn do_something(bar: Bar) {}

export interface Foo {
  name: string
}
export interface Bar {
  id: number
}
export function doSomething(bar: Bar): void