feat: support use null as typebox route response type

Author: ddadaal

.changeset/strange-tools-grab.md

@@ -0,0 +1,5 @@
+---
+"@ddadaal/next-typed-api-routes-runtime": minor
+---
+
+support use Type.Null() as typebox route response type

example/src/pages/api/typeboxRoute/[test].ts

@@ -7,11 +7,12 @@ export const TypeboxRouteSchema = typeboxRouteSchema({
   responses: {
     200: Type.Object({ hello: Type.String() }),
     404: Type.Object({ error: Type.String() }),
+    500: Type.Null(),
   },
 });
 
 export default typeboxRoute(TypeboxRouteSchema, async (req) => {
-  
+
   if (req.body.error) {
     return { 404: { error: "123" } };
   } else {

example/src/pages/api/zodRoute/[test].ts

@@ -7,6 +7,7 @@ export const ZodRouteSchema = zodRouteSchema({
   responses: {
     200: z.object({ hello: z.string() }),
     404: z.object({ error: z.string() }),
+    500: z.null(),
   },
 });
 

packages/runtime/src/route/typeboxRoute.ts

@@ -1,14 +1,16 @@
-import { Static, TObject } from "@sinclair/typebox";
+import { Kind, Static, TNull, TObject } from "@sinclair/typebox";
 import fastJson from "fast-json-stringify";
 import { NextApiRequest, NextApiResponse } from "next";
 
 import { ajvOptions, createAjv } from "./ajv";
 import { OrPromise, returnError, Serializer, ValueOf } from "./utils";
 
+export type TypeboxReturnType = TObject | TNull;
+
 export interface TypeboxRouteSchema<
   TQuery extends TObject = TObject,
   TBody extends TObject = TObject,
-  TResponses extends Record<number, TObject> = Record<number, TObject>,
+  TResponses extends Record<number, TypeboxReturnType> = Record<number, TypeboxReturnType>,
 > {
   method: string;
   query?: TQuery;
@@ -18,7 +20,7 @@ export interface TypeboxRouteSchema<
 
 export type TypeboxRawType<T> = 
   T extends undefined ? undefined 
-    : T extends TObject ? Static<T>
+    : T extends TypeboxReturnType ? Static<T>
       : T;
 
 
@@ -56,8 +58,10 @@ export function typeboxRoute<TSchema extends TypeboxRouteSchema>(
     const serializers = new Map<string, Serializer>();
 
     for (const [code, schema] of Object.entries(responses)) {
-      const serializer = fastJson(schema, { ajv: ajvOptions });
-      serializers.set(code, serializer);
+      if (schema[Kind] === "Object") {
+        const serializer = fastJson(schema, { ajv: ajvOptions });
+        serializers.set(code, serializer);
+      }
     }
     return serializers;
   })(schema.responses);