rollup-plugin-jco

✨ Leverage WASI Components by simply importing them into your project! ✨

• 🤖 Automatically transpile WebAssembly component bindings to JavaScript
• 🌳 Automatically generate TypeScript types from WIT definitions
• ⚡️ Lazy instantiation support
• 💻 Rollup and Vite support

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A plugin for Rollup and Vite that allows you to easily import WebAssembly (WASI) components into your JavaScript or Typescript codebase. It is based on @bytecodealliance/jco, which allows transpiling WASI Components to JavaScript modules.

Installation

To install the plugin, you can use npm or yarn. Make sure you have @bytecodealliance/jco installed in your project; this plugin requires it as a peer-dependency.

npm install --save-dev rollup-plugin-jco @bytecodealliance/jco

Usage

The plugin can be used in your Rollup or Vite configuration file to transpile a WASI component to a JavaScript module. It will automatically handle the transpilation process and generate the necessary bindings for you.

Here's how to initialize the plugin with Rollup and/or Vite:

Vite	Rollup
// vite.config.js import { defineConfig } from 'vite'; import { wasi } from 'rollup-plugin-jco'; export default defineConfig({ // ... your vite config ... plugins: [ wasi({/* Extra jco options*/}) ] });	// rollup.config.js import { wasi } from 'rollup-plugin-jco'; export default { // ... your rollup config ... plugins: [ wasi({/* Extra jco options*/}) ] };

Then, you can import a WebAssembly Component directly in your JS/TS code. Any additional JCO transpilation options can be passed directly in the import statement as query parameters.

Note

Type generation occurs upon build. When importing a component for the first time, you can expect your IDE to show an error until you build your project next.

import component from './adder_component.wasm?component';

// Typescript types will automatically be generated after first build
const result = component.addTwoIntegers(1, 2);

Full Example

For a full example of how the plugin can be used in a React + Vite project, see the included example in the example directory:

• React + Vite Adder WASI Component Example: ./examples/adder
  • Importing a WASI component: ./examples/adder/src/components/AdderFromImport.tsx
  • Importing a WASI component with lazy instantiation: ./examples/adder/src/components/AdderFromImportAsync.tsx

API Reference

Full API reference for the plugin is generated using typedoc and can be found here.

Information relating to the JCO API can be found here or on the JCO GitHub repository.