update readme

playground/server/trpc/index.ts

@@ -1,21 +1,45 @@
 // ~/server/trpc/index.ts
 import { z } from 'zod'
 import * as trpc from '@trpc/server'
+import type { inferAsyncReturnType } 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' },
+  { id: 1, username: 'jcena' },
+  { id: 2, username: 'dbatista' },
+  { id: 3, username: 'jbiden' },
 ]
 
 export const router = trpc
-  .router()
+  .router<inferAsyncReturnType<typeof createContext>>()
+  .query('getUsers', {
+    resolve() {
+      return fakeUsers
+    },
+  })
   .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)
+      return fakeUsers.find(i => i.username === req.input.username) ?? null
     },
   })
+  .mutation('createUser', {
+    input: z.object({ username: z.string().min(5) }),
+    resolve(req) {
+      const newUser = {
+        id: fakeUsers.length + 1,
+        username: req.input.username,
+      }
+      fakeUsers.push(newUser)
+      return newUser
+    },
+  })
+
+export const createContext = () => {
+  // ...
+  return {
+    /** context data */
+  }
+}