This is a simple Webpack loader that shells out to cargo to build a Rust project targeting either asm.js or WebAssembly. See this post for more details on using Rust to target the web.

To use it, first install the package:

$ npm install --save rust-emscripten-loader

then configure the loader in your Webpack config:

module.exports = {
  // ...
  module: {
    rules: [
      { test: /\.rs$/, loader: 'rust-emscripten-loader' },
      // ...
    ]
  }
}

Make sure you have the cargo, rustc, and emsdk binaries somewhere in your PATH.

When targeting WebAssembly, the loader will emit two additional files: one .wasm and one .js. You must specify the outName option to tell the loader how to name these files, and you'll need to load them info your HTML page in order to run the code. Check out the configuration and example sections below for more details.

The following options can be added to the Webpack loader query:

Check out the example directory for a simple Hello World example targeting both asm.js and WebAssembly.