fix(types): honojs#2912: interfaces array's respond typed as never

src/client/client.test.ts

@@ -461,6 +461,13 @@ describe('Merge path with `app.route()`', () => {
         ok: true,
       })
     }),
+    http.get('http://localhost/api/searchArray', async () => {
+      return HttpResponse.json([
+        {
+          ok: true,
+        },
+      ])
+    }),
     http.get('http://localhost/api/foo', async () => {
       return HttpResponse.json({
         ok: true,
@@ -537,6 +544,24 @@ describe('Merge path with `app.route()`', () => {
     expect(data.ok).toBe(true)
   })
 
+  it('Should have correct types - with array of interfaces', async () => {
+    interface Result {
+      ok: boolean
+      okUndefined?: boolean
+    }
+    type Results = Result[]
+
+    const results: Results = [{ ok: true }]
+    const base = new Hono<Env>().basePath('/api')
+    const app = base.get('/searchArray', (c) => c.json(results))
+    type AppType = typeof app
+    const client = hc<AppType>('http://localhost')
+    const res = await client.api.searchArray.$get()
+    const data = await res.json()
+    type verify = Expect<Equal<Results, typeof data>>
+    expect(data[0].ok).toBe(true)
+  })
+
   it('Should allow a Date object and return it as a string', async () => {
     const app = new Hono()
     const route = app.get('/api/foo', (c) => c.json({ datetime: new Date() }))

src/context.ts

@@ -2,7 +2,7 @@ import type { HonoRequest } from './request'
 import type { Env, FetchEventLike, Input, NotFoundHandler, TypedResponse } from './types'
 import { HtmlEscapedCallbackPhase, resolveCallback } from './utils/html'
 import type { RedirectStatusCode, StatusCode } from './utils/http-status'
-import type { IsAny, JSONParsed, JSONValue, Simplify } from './utils/types'
+import type { DeepSimplify, IsAny, JSONParsed, JSONValue, Simplify } from './utils/types'
 
 type HeaderRecord = Record<string, string | string[]>
 
@@ -127,30 +127,30 @@ interface TextRespond {
  * @param {U} [status] - An optional status code for the response.
  * @param {HeaderRecord} [headers] - An optional record of headers to include in the response.
  *
- * @returns {Response & TypedResponse<Simplify<T> extends JSONValue ? (JSONValue extends Simplify<T> ? never : JSONParsed<T>) : never, U, 'json'>} - The response after rendering the JSON object, typed with the provided object and status code types.
+ * @returns {Response & TypedResponse<DeepSimplify<T> extends JSONValue ? (JSONValue extends DeepSimplify<T> ? never : JSONParsed<T>) : never, U, 'json'>} - The response after rendering the JSON object, typed with the provided object and status code types.
  */
 interface JSONRespond {
-  <T extends JSONValue | Simplify<unknown>, U extends StatusCode>(
+  <T extends JSONValue | DeepSimplify<unknown>, U extends StatusCode>(
     object: T,
     status?: U,
     headers?: HeaderRecord
   ): Response &
     TypedResponse<
-      Simplify<T> extends JSONValue
-        ? JSONValue extends Simplify<T>
+      DeepSimplify<T> extends JSONValue
+        ? JSONValue extends DeepSimplify<T>
           ? never
           : JSONParsed<T>
         : never,
       U,
       'json'
     >
-  <T extends JSONValue | Simplify<unknown>, U extends StatusCode>(
-    object: Simplify<T> extends JSONValue ? T : Simplify<T>,
+  <T extends JSONValue | DeepSimplify<unknown>, U extends StatusCode>(
+    object: DeepSimplify<T> extends JSONValue ? T : DeepSimplify<T>,
     init?: ResponseInit
   ): Response &
     TypedResponse<
-      Simplify<T> extends JSONValue
-        ? JSONValue extends Simplify<T>
+      DeepSimplify<T> extends JSONValue
+        ? JSONValue extends DeepSimplify<T>
           ? never
           : JSONParsed<T>
         : never,