add superjson to playground

playground/plugins/trpc-client.ts

@@ -1,9 +1,12 @@
 import { httpBatchLink, loggerLink } from '@trpc/client'
 import { createTRPCNuxtProxyClient } from 'trpc-nuxt/client'
+import superjson from 'superjson'
 import type { AppRouter } from '~~/server/trpc/routers'
 
 export default defineNuxtPlugin(() => {
+
   const client = createTRPCNuxtProxyClient<AppRouter>({
+    transformer: superjson,
     links: [
       // adds pretty logs to your console in development and logs errors in production
       loggerLink({