A Rust vector with enum elements should result in a TypeScript array of enum elements instead of any elements

[johanpel]

Motivation

From this Rust program:

use wasm_bindgen::prelude::*;

#[wasm_bindgen]
pub enum MyEnum {
    A,
    B,
}

#[wasm_bindgen]
pub fn foo() -> Vec<MyEnum> {
    unimplemented!()
}

#[wasm_bindgen]
pub fn bar(values: Vec<MyEnum>) -> MyEnum {
    unimplemented!()
}

the following TS code is generated:

export function foo(): any[];
export function bar(values: any[]): MyEnum;
export enum MyEnum {
  A = 0,
  B = 1,
}

Proposed Solution

The binding code is functional, but for the sake of improved type-safety on the TypeScript side it would be nice if:

1. foo would return MyEnum[] instead of any[]
2. bar would take MyEnum[] instead of any[] for the values argument.

Note that the return value of bar is indeed MyEnum already.

Alternatives

I can't think of any other sensible alternatives to what is proposed.

Additional Context

None.