Property 'signIn' does not exist on type

Using Tanstack Start and Convex. signIn doesn't seem to exist when running this code:
await authClient.signIn.social({
  // ...
});


authClient looks like this:
import { createAuthClient } from 'better-auth/react';
import { convexClient } from '@convex-dev/better-auth/client/plugins';

export const authClient = createAuthClient({
  plugins: [convexClient()],
});


Followed this guide: https://convex-better-auth.netlify.app/framework-guides/tanstack-start

Full error:
Property 'signIn' does not exist on type '{ signOut: <FetchOptions extends { headers?: (HeadersInit & (HeadersInit | CommonHeaders)) | undefined; method?: string | undefined; cache?: RequestCache | undefined; ... 31 more ...; disableValidation?: boolean | undefined; }>(data_0?: Prettify<...> | undefined, data_1?: FetchOptions | undefined) => Promise<...>; }...'.
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