lastriko

Server-driven UI for AI demos and rapid prototypes: your TypeScript app() builds handles, the engine renders HTML fragments, and the browser swaps outerHTML over a WebSocket.

Install

npm install lastriko

Requires Node.js 22+. Bun is also supported.

Quick start

import { app } from 'lastriko';

await app('Hello', (ui) => {
  const name = ui.textInput('Name');
  const out = ui.text('Hi!');
  ui.button('Greet', () => {
    out.update(`Hello, ${name.value || 'stranger'}!`);
  });
});

Run with tsx or bun; open the URL printed in the console (default port 3500).

Exports

• JS API — import { app, defineConfig } from 'lastriko'
• Styles — import 'lastriko/style.css' (or load /style.css from the dev server)

Docs

• Project manifest & roadmap
• API reference
• Current phase plan (Phase 4.5)

Examples in this repo

• examples/component-gallery — all MVP components on one page
• examples/experiment-monitor, examples/image-viewer — larger demos

Publishing (maintainers)

From the monorepo root, after tests pass:

npm run build -w lastriko
npm publish -w lastriko --access public

prepack runs build automatically on npm publish.

License

MIT — see LICENSE in the repository root.