Sveltery UI and its components are written in TypeScript. We recommend TypeScript for your project as well.
The CLI supports TypeScript projects only. It copies components as .svelte files with <script lang="ts"> and as .ts modules, and components.json must have "typescript": true. With any other value, the CLI stops:
components.json is invalid. typescript: expected true, got boolean. Only TypeScript projects are supported.The shadcn CLI can write JavaScript components when tsx is false. This CLI has no JavaScript output yet.
Use the components in a JavaScript app
A SvelteKit app that you write in JavaScript can still use the components. Svelte and Vite compile the TypeScript in .svelte and .ts files, so the copied components build in an app that has only a jsconfig.json. Your own files stay JavaScript.
<script>
import { Button } from '#lib/components/ui/button';
</script>
<Button>Click me</Button>