fix missing exports warnings

playground/server/trpc/index.ts

@@ -0,0 +1,21 @@
+// ~/server/trpc/index.ts
+import { z } from 'zod'
+import * as trpc from '@trpc/server'
+
+const fakeUsers = [
+  { id: 1, username: 'jcena', name: 'John Cena' },
+  { id: 2, username: 'dbatista', name: 'Dave Batista' },
+  { id: 3, username: 'jbiden', name: 'Joe Biden' },
+]
+
+export const router = trpc
+  .router()
+  .query('getUser', {
+    // validate input with Zod
+    input: z.object({
+      username: z.string().min(5),
+    }),
+    resolve(req) {
+      return fakeUsers.find(i => i.username === req.input.username)
+    },
+  })