`clerkJSVariant` prop removed - Clerk

The clerkJSVariant prop has been removed. Use prefetchUI={false} instead to disable prefetching the UI bundle. The UI will still be loaded on-demand when needed, but won't be prefetched during initial page load.

A codemod is available to automatically apply this change:

diff

<ClerkProvider
- clerkJSVariant="headless"
+ prefetchUI={false}
  publishableKey={...}
>

You can also disable UI prefetching via environment variable:

Next.js: NEXT_PUBLIC_CLERK_PREFETCH_UI=false
Astro: PUBLIC_CLERK_PREFETCH_UI=false
React Router / TanStack Start: CLERK_PREFETCH_UI=false