feat: add file routing option

examples/custom/server/trpc/routers/user.ts

@@ -0,0 +1,33 @@
+import { z } from 'zod'
+import { publicProcedure, router } from '../trpc'
+
+const baseURL = 'https://jsonplaceholder.typicode.com'
+
+const UserShape = z.object({
+  id: z.number(),
+  name: z.string(),
+  username: z.string(),
+  email: z.string()
+})
+
+export type User = z.infer<typeof UserShape>
+
+export const userRouter = router({
+  getUsers: publicProcedure
+    .query(() => {
+      return $fetch<User[]>(`${baseURL}/users`)
+    }),
+  getUser: publicProcedure
+    .input(z.number())
+    .query((req) => {
+      return $fetch<User>(`${baseURL}/users/${req.input}`)
+    }),
+  addUser: publicProcedure
+    .input(UserShape)
+    .mutation((req) => {
+      return $fetch<User>(`${baseURL}/users`, {
+        method: 'POST',
+        body: req.input
+      })
+    })
+})