Published Oxc packages that run on Cloudflare Workers using the wasm32-wasip1 target.

Demo: https://t.co/WGbxnrjS9F

Boshen/oxc-wasip1-workers

Source: https://github.com/Boshen/oxc-wasip1-workers

Oxc WASI bindings on Cloudflare Workers

Runnable Cloudflare Workers demos for Oxc’s threadless wasm32-wasip1 N-API bindings:

• @oxc-parser/binding-wasm32-wasip1
• @oxc-minify/binding-wasm32-wasip1
• @oxc-transform/binding-wasm32-wasip1
• @oxc-transform-react/binding-wasm32-wasip1

Each Worker imports a precompiled WebAssembly module and instantiates the N-API binding inside its request handler, where Cloudflare permits WASI initialization.

Live demos

curl -fsS https://oxc-wasip1-parser-yx3a4w.boshenc.workers.dev/
curl -fsS https://oxc-wasip1-minify-yx3a4w.boshenc.workers.dev/
curl -fsS https://oxc-wasip1-transform-yx3a4w.boshenc.workers.dev/
curl -fsS https://oxc-wasip1-transform-react-yx3a4w.boshenc.workers.dev/

Every endpoint returns JSON containing "ok": true, its package version, and package-specific output.

Run locally against Cloudflare’s remote runtime

Install dependencies:

npm ci

Start any demo through Wrangler’s remote preview:

npm run dev:parser
npm run dev:minify
npm run dev:transform
npm run dev:transform-react

Run the bundle checks and verify the deployed endpoints:

npm run check
npm run test:remote

Deploy

Authenticate Wrangler, then deploy one or all Workers:

npx wrangler login
npm run deploy:parser
npm run deploy:all

The four Workers are kept separate so every compressed bundle remains comfortably below Cloudflare’s Worker size limits.

To remove them:

npx wrangler delete --name oxc-wasip1-parser-yx3a4w --force
npx wrangler delete --name oxc-wasip1-minify-yx3a4w --force
npx wrangler delete --name oxc-wasip1-transform-yx3a4w --force
npx wrangler delete --name oxc-wasip1-transform-react-yx3a4w --force

Integration details

Use the .wasm-suffixed package export so Wrangler classifies the import as a compiled WebAssembly module:

import parserWasm from "@oxc-parser/binding-wasm32-wasip1/wasm.wasm";
import { instantiate } from "@oxc-parser/binding-wasm32-wasip1/workerd";

Start instantiation inside fetch(), not at module scope. The demos cache the resulting promise so warm requests reuse the same binding:

let bindingPromise;

function getBinding() {
  bindingPromise ??= instantiate(parserWasm);
  return bindingPromise;
}

The low-level parser binding returns serialized AST data through result.program. Decode it with JSON.parse(result.program).node, as shown in src/parser.js.

Project layout

• src/parser.js parses TypeScript and inspects its AST.
• src/minify.js minifies JavaScript.
• src/transform.js removes TypeScript syntax.
• src/transform-react.js runs the React Compiler and JSX transform.
• scripts/test-remote.mjs checks all live endpoints.

License

MIT

This demo was created with AI assistance and reviewed through live Cloudflare Worker execution.