fix(zod-openapi): use `JSONParsed` for creating a response type (#576)

* fix(zod-openapi): use `JSONParsed` for creating a response type

* add changeset

.changeset/curly-pears-act.md

@@ -0,0 +1,5 @@
+---
+'@hono/zod-openapi': patch
+---
+
+fix: use `JSONParsed` for creating a response type

packages/zod-openapi/src/index.ts

@@ -27,6 +27,7 @@ import type {
   TypedResponse,
 } from 'hono'
 import type { MergePath, MergeSchemaPath } from 'hono/types'
+import type { JSONParsed, RemoveBlankRecord } from 'hono/utils/types'
 import type {
   ClientErrorStatusCode,
   InfoStatusCode,
@@ -35,7 +36,6 @@ import type {
   StatusCode,
   SuccessStatusCode,
 } from 'hono/utils/http-status'
-import type { RemoveBlankRecord } from 'hono/utils/types'
 import { mergePath } from 'hono/utils/url'
 import type { AnyZodObject, ZodError, ZodSchema } from 'zod'
 import { ZodType, z } from 'zod'
@@ -167,7 +167,7 @@ export type RouteConfigToTypedResponse<R extends RouteConfig> = {
   > extends never
     ? TypedResponse<{}, ExtractStatusCode<Status>, string>
     : TypedResponse<
-        ExtractContent<R['responses'][Status]['content']>,
+        JSONParsed<ExtractContent<R['responses'][Status]['content']>>,
         ExtractStatusCode<Status>,
         'json'
       >

packages/zod-openapi/test/index.test-d.ts

@@ -1,5 +1,5 @@
-import type { Hono, Env, ToSchema } from 'hono'
+import type { Env, Hono, ToSchema } from 'hono'
-import { describe, it, expectTypeOf, assertType } from 'vitest'
+import { assertType, describe, expectTypeOf, it } from 'vitest'
 import { OpenAPIHono, createRoute, z } from '../src/index'
 
 describe('Types', () => {
@@ -171,3 +171,30 @@ describe('Input types', () => {
     })
   })
 })
+
+describe('Response schema includes a Date type', () => {
+  it('Should not throw a type error', () => {
+    new OpenAPIHono().openapi(
+      createRoute({
+        method: 'get',
+        path: '/example',
+        responses: {
+          200: {
+            content: {
+              'application/json': {
+                schema: z.object({
+                  updatedAt: z.date(),
+                }),
+              },
+            },
+            description: '',
+          },
+        },
+      }),
+      async (ctx) => {
+        // Don't throw an error:
+        return ctx.json({ updatedAt: new Date() }, 200)
+      }
+    )
+  })
+})