Use Hono framework with a val.town val.

npm test

npm run test:ui

Start a Vite server at localhost:8888.

npm start

Locally we are using Vite as server. In the vite config we use a plugin, @cloudflare/vite-plugin. It integrates the cloudflare worker (the Hono app) with the vite server. The @cloudflare/vite-plugin embeds a Cloudflare Worker runtime inside Vite's
dev server.

Vite gives us HMR and bundling. The Vite plugin runs the worker code, which is why the worker works locally.

Vite builds to public/, but we do not use that folder during development.

In the worker file (./src/server/index.tsx), it checks if we are in local dev or production. In dev, ASSETS doesn't exist; it returns notFound() and Vite handles it. In production, ASSETS does exist, so it serves the static asset.

When you run npm start, the Cloudflare Vite plugin routes requests to your Hono server at src/server/index.tsx:126, which renders the Page component. This Page component uses the .tsx components (TimestampCard, GreetingCard, CounterCard, QuoteCard) which are server-side rendered.

The page.tsx is a layout skeleton that accepts props.

Create val
export const Page:FC<PropsWithChildren<PageProps>> = ({
    title,
    signals = {},
    children
})

Any site pages should extend this template, and pass in content and signals. An example is ./src/components/home-page.tsx.

• Server renders the full HTML with components
• data-signals initializes the reactive state
• Datastar library (loaded via CDN) handles client-side reactivity
• API endpoints return SSE responses that update signals

I do not understand why we need to run vite build twice, but we do.

The empty object in public/client/vite-manifest.json is necessary because the server depends on it when we run the build process.

Create val
// package.json
{
  "scripts": {
    "build": "rm -rf ./public && mkdir -p ./public/client && echo '{}' > ./public/client/vite-manifest.json && vite build && vite build",
  }
}