update playground

packages/playground/server/trpc/trpc.ts

@@ -0,0 +1,29 @@
+import { initTRPC } from '@trpc/server'
+import superjson from 'superjson'
+import type { Context } from './context'
+
+const t = initTRPC.context<Context>().create({
+  transformer: superjson,
+})
+
+/**
+ * Create a router
+ * @see https://trpc.io/docs/v10/router
+ */
+export const router = t.router
+
+/**
+  * Create an unprotected procedure
+  * @see https://trpc.io/docs/v10/procedures
+  **/
+export const publicProcedure = t.procedure
+
+/**
+  * @see https://trpc.io/docs/v10/middlewares
+  */
+export const middleware = t.middleware
+
+/**
+  * @see https://trpc.io/docs/v10/merging-routers
+  */
+export const mergeRouters = t.mergeRouters