Rakkas projects can be deployed to Vercel Serverless Functions or Vercel Edge Functions. For Vercel-edge, you should install the suitable HatTip adapter first:

npm install -S @hattip/vercel-edge

Serverless functions don't require any additional packages. Then you should set the adapter option of Rakkas Vite plugin to "vercel" or "vercel-edge":

import { defineConfig } from "vite";
import rakkas from "rakkasjs/vite-plugin";

export default defineConfig({
  plugins: [
      adapter: "vercel", // or "vercel-edge"

After building with rakkas build, you can deploy with vercel deploy --prebuilt.

Worker-specific APIs

Vercel Edge Functions run on a worker runtime. But, during development, Rakkas applications always run on Node.js regardless of the adapter setting. As such, Worker APIs will not be available during development. We're looking into ways of polyfilling these APIs for development. Also, process.env is not yet available for Vercel Edge.