universal-javascript-runtimes

What problem does it solve?

This Skill clarifies how to write JavaScript that runs across diverse runtimes (Node.js, Cloudflare Workers, Deno, Bun, and other edge/serverless environments) by embracing web standards and adapters, eliminating runtime fragmentation.

Core Features & Use Cases

• Web standards-based portability: Use Fetch, Request, Response, URL, Streams, and Web Crypto to write code that works on all target runtimes.
• Adapters and polyfills: Leverage Nitro/H3 style adapters and unenv polyfills to bridge differences between server and edge environments.
• Use cases: Build cross-runtime APIs, edge functions, and universal libraries that deploy to cloud functions, edge networks, and traditional servers.

Quick Start

Create a minimal universal app using Nitro and H3, choose a target preset (Node.js, Cloudflare, Deno, or Bun), and implement a basic HTTP handler that uses web standards. Then integrate unenv polyfills where necessary and test across supported environments.