feat: add file routing option

examples/custom/server/trpc/trpc.ts

@@ -0,0 +1,43 @@
+import { initTRPC } from '@trpc/server'
+import superjson from 'superjson'
+import { ZodError } from 'zod'
+import type { Context } from './context'
+
+const t = initTRPC.context<Context>().create({
+  transformer: superjson,
+  errorFormatter ({ shape, error }) {
+    return {
+      ...shape,
+      data: {
+        ...shape.data,
+        zodError:
+          error.code === 'BAD_REQUEST' &&
+          error.cause instanceof ZodError
+            ? error.cause!.flatten()
+            : null
+      }
+    }
+  }
+})
+
+/**
+ * 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