This is a template for creating your first Copilot extension. It's a simple Node.js app that uses Hono.
npm install
npm run dev
open http://localhost:3000
Use tunneling to expose your localhost to the internet via VS Code's Port forwarding, ngrok, or similar.
You'll need to create a GitHub app for the Copilot extension to work and use the URL from the from the tunneling above in your GitHub app configuration.
For a full breakdown of how to get started, check out Nick's Blog post, Creating a GitHub Copilot Extension: A Step-by-Step Guide.