Re-export imported JS modules, raw_modules, inline_js

[alexlapa]

Motivation

Use case:

lib.rs:

#[wasm_bindgen(module = "/src/error.js")]
extern "C" {
    #[wasm_bindgen(extends = Object, extends = Error)]
    #[derive(Clone, Debug, PartialEq, Eq)]
    pub type MyError;

    #[wasm_bindgen(constructor)]
    fn new(message: &str) -> MyError;
}

#[wasm_bindgen]
pub fn get_my_err() -> MyError {
    MyError::new("msg")
}

/src/error.js:

export class MyError extends Error {
  constructor(message) {
    super(message);
    this.name = this.constructor.name;
  }
}

index.js

import {MyError} from "../../pkg/snippets/wasm-tests-2b0d4d4468a848de/src/error";

const rust = import('../../pkg');
rust
  .then(rust => {
        let foo = rust.get_my_err();
        console.log(foo instanceof MyError); // true
  });

It is not convenient to import MyError this way.

Proposed Solution

Reexport imported snippets. I.e.:
pkg/index.js:

import { MyError } from './snippets/wasm-tests-2b0d4d4468a848de/src/error.js';
import * as wasm from './index_bg.wasm';

export { MyError };
...

[alexcrichton]

Thanks for the report! The purpose of the snippets feature, however, is for local private code to be imported into a project. If JS code needs to import JS code then you'll likely want to set up an NPM/JS package to share so you can import from that in both JS locations.

[alexlapa]

@alexcrichton ,

Waiting for rustwasm/wasm-pack#606 then. Thanks!