webassembly-loader

this loader can also be used as a library ^{↙ see who use this?}

^{tl;dr -- see examples}

Motivation

Minimum Requirements

• Node v8
• Webpack v4

Installation

npm install webassembly-loader --save-dev

or

yarn add webassembly-loader --dev

Options

export

How wasm code would be exported. (see examples)

• Type: string
• Default: async
• Expected value:
  • buffer will export wasm code as Buffer
  • module will export wasm code as WebAssembly.Module
  • instance will export wasm code as WebAssembly.Instance
  • async will instantiate wasm code asynchronously, return promise of both WebAssembly.Module and WebAssembly.Instance
  • async-module will compile wasm code asynchronously, return promise of WebAssembly.Module
  • async-instance will instantiate wasm code asynchronously, return promise of WebAssembly.Instance

webpack.config.js

module.exports = {
    rules: [{
          test: /\.wasm$/,
          type: "javascript/auto",
          use: [{
              loader: "webassembly-loader",
              options: {
                  export: "async"
              }
          }]
    }]
}

tips: you can use query parameter to change export mode on demand

Examples

See the test cases and example projects in *.test.ts and examples for more insight.

---

{export: 'buffer'}

import wasmCode from "./lib.wasm";
 
WebAssembly.compile(wasmCode).then(module => {
  const instance = new WebAssembly.Instance(module);
  console(instance.exports.add(1, 2)); // 3
});

---

{export: 'module'}

import wasmModule from "./lib.wasm";
 
const instance = new WebAssembly.Instance(wasmModule);
console(instance.exports.add(1, 2)); // 3

---

{export: 'instance'}

import wasm from "./lib.wasm";
 
console(wasm.exports.add(1, 2)); // 3

---

{export: 'async'}

import wasmInstantiate from "./lib.wasm";
 
wasmInstantiate(importObject | undefined).then(({ instance, module }) => {
  console(instance.exports.add(1, 2)); // 3
 
  // create different instance, extra will be called in different environment
  const differentInstance = new WebAssembly.Instance(module);
  console(differentInstance.exports.add(1, 2)); // 6
});

---

{export: 'async-instance'}

import wasmInstantiate from "./lib.wasm";
 
wasmInstantiate(importObject | undefined).then(instance => {
  console(instance.exports.add(1, 2)); // 3
});

---

{export: 'async-module'}

import wasmInstantiate from "./lib.wasm";
 
wasmCompile(importObject | undefined).then(module => {
  const differentInstance = new WebAssembly.Instance(module);
  console(differentInstance.exports.add(1, 2)); // 3
});

---

Who use this?

• rs-jest
• rollup-plugin-rust
• [add yours 😉]

Contributing

• CONTRIBUTING.md for how you can make contribution
• HACKING.md for technical details

Credits

• rust-native-wasm-loader
• webpack-defaults

---

License

MIT