TypeScript Type Inference Issue with createServerFn and Connect RPC

createServerFn().handler()

getCurrentUser

Protobuf

// My Connect RPC response type (discriminated union)
type ConnectRpcResponse<TData extends Message> = 
  | { readonly data: TData; readonly error?: undefined; }
  | { readonly data?: undefined; readonly error: ConnectError; };

// My getCurrentUser function returns this type
export async function getCurrentUser(
  payload: ConnectRpcRequestPayload<GetCurrentUserRequest>
): Promise<ConnectRpcResponse<UserAccountDetails>> {
  // ... implementation
  return { data: response.account.value }; // UserAccountDetails
}

// Trying to use it with createServerFn
const beforeLoad = createServerFn({ method: 'GET' }).handler(async function() {
  const data = await getCurrentUser({});
  return data; // ❌ TypeScript error here causes Cursor IDE to completely hang/freeze,
});