cf-ts-bundler-worker

A fast, lightweight Cloudflare Worker that runs esbuild on the edge to compile TypeScript to JavaScript with CDN imports support.

Features

• ⚡ Dynamic TypeScript compilation with esbuild-wasm running on the edge
• 🌐 Automatic CDN imports resolution
• 📡 REST API with OpenAPI documentation
• 📁 File upload support
• ☁️ Low-latency compilation powered by Cloudflare's global network

Installation

This package provides a pre-built, production-ready Cloudflare Worker bundle. No build step required!

npm install @jitsi/cf-ts-bundler-worker

The package includes:

• Minified Worker code (~265 KB)
• esbuild-wasm module (~12 MB)
• Source maps for debugging

Quick Start

Option 1: Deploy using Wrangler (Recommended)

# Install the package
npm install @jitsi/cf-ts-bundler-worker

# Deploy to Cloudflare (no build needed!)
npx wrangler deploy node_modules/@jitsi/cf-ts-bundler-worker/worker-dist/index.js \
  --name my-ts-bundler \
  --compatibility-flag nodejs_compat

Option 2: Deploy from Source

Clone and customize the Worker:

git clone https://github.com/jitsi/cloudflare-ts-bundler-worker.git
cd cloudflare-ts-bundler-worker
npm install
npm run deploy

Configuration

Environment Variables

The worker uses the following environment variables:

Variable	Description	Required	Default
AUTH_ENABLED	Enable/disable JWT authentication. Set to 'true' to enable.	No	false (disabled)
JWT_ISSUER	Expected issuer claim in JWT tokens	Only when AUTH_ENABLED=true	-
PUBLIC_KEY	RSA public key in PEM format (SPKI) for JWT signature verification	Only when AUTH_ENABLED=true	-

Note: The PUBLIC_KEY is a public key and is not sensitive data. Only the corresponding private key (used to sign tokens) needs to be kept secret.

Security Consideration: By default, authentication is disabled for easier development and testing. For production deployments, it's recommended to set AUTH_ENABLED=true to protect your endpoints.

Local Development

1. Copy the example environment file:

   cp .dev.vars.example .dev.vars

2. Edit .dev.vars with your actual values:

   JWT_ISSUER=https://your-auth-server.com
   PUBLIC_KEY=-----BEGIN PUBLIC KEY-----
   Your actual RSA public key here
   -----END PUBLIC KEY-----

3. Start the dev server (it will automatically load .dev.vars):

   npm run dev

Production Deployment

Set environment variables using Wrangler CLI:

# Enable authentication (recommended for production)
wrangler secret put AUTH_ENABLED
# When prompted, enter: true

# Set JWT configuration (required when AUTH_ENABLED=true)
wrangler secret put JWT_ISSUER
wrangler secret put PUBLIC_KEY

# Or set as regular environment variables
wrangler deploy --var AUTH_ENABLED:true --var JWT_ISSUER:https://your-auth-server.com

Alternatively, use the Cloudflare dashboard to set environment variables in your worker settings.

For development/testing environments without authentication:

# Omit AUTH_ENABLED or set it to false
wrangler deploy
# Authentication will be disabled by default

API Reference

Base URL: https://your-worker.your-subdomain.workers.dev

Interactive Documentation:

• Swagger UI: /_cfw/cf-ts-bundler-worker/docs
• OpenAPI JSON: /_cfw/cf-ts-bundler-worker/openapi.json

Usage Examples

Basic Compilation (cURL)

curl -X POST https://your-worker.your-subdomain.workers.dev/_cfw/cf-ts-bundler-worker/compile \
  -H "Content-Type: application/json" \
  -d '{"code": "const message: string = \"Hello!\"; console.log(message);"}'

Response:

{
  "success": true,
  "compiledCode": "var o=\"Hello!\";console.log(o);\n"
}

File Upload Compilation (cURL)

curl -X POST https://your-worker.your-subdomain.workers.dev/_cfw/cf-ts-bundler-worker/compile-file \
  -F "[email protected]"

Note: Currently supports single file uploads only. Multi-file project bundling is planned for future releases.

Response: Returns the compiled JavaScript file for download.

Example TypeScript File (example.ts)

import { Hono } from 'hono';
import { z } from 'zod';
import { zValidator } from '@hono/zod-validator';

const userSchema = z.object({
  name: z.literal("John"),
  age: z.number().min(18),
  email: z.email().optional(),
});

type User = z.infer<typeof userSchema> & {
  id: string;
};

const app = new Hono();

app.get('/', (c) => c.json({ message: 'Hello World!' }));

app.post('/users', zValidator('json', userSchema), (c) => {
  const userData = c.req.valid('json');
  
  const user: User = {
    id: `user-${crypto.randomUUID().slice(0, 8)}`,
    ...userData,
  };
  
  return c.json({ message: 'User created!', user }, 201);
});

export default app;

Development

# Local development
npm run dev

# Run tests
npm test

# Deploy
npm run deploy

TODO / Roadmap

• 📦 Multiple files support - Bundle entire TypeScript projects with multiple files and dependencies
• 📊 Compilation performance metrics and caching
• 🔧 Custom esbuild configuration options
• 🔐 JWKS or ASAP-style (Key by Hash Method) support to improve JWT authentication with key rotation

License

Apache License 2.0 - see LICENSE file for details.