wip: refresh design

packages/trpc/client/guards.ts

@@ -0,0 +1,7 @@
+import { TRPCClientError } from '@trpc/client';
+
+import { AppRouter } from '../server/router';
+
+export const isTRPCBadRequestError = (err: unknown): err is TRPCClientError<AppRouter> => {
+  return err instanceof TRPCClientError && err.shape?.code === 'BAD_REQUEST';
+};