Function loader

examples/react/react-router/src/routes/contact.tsx:24–31

(queryClient: QueryClient)

export const loader =
  (queryClient: QueryClient) =>
  async ({ params }: LoaderFunctionArgs) => {
    if (!params.contactId) {
      throw new Error('No contact ID provided')
    }
    await queryClient.ensureQueryData(contactDetailQuery(params.contactId))
    return { contactId: params.contactId }
  }

export const action =
  (queryClient: QueryClient) =>