With typescript, type inference is lost if the json returned is not an object but an array

[bosens-China]

What version of Hono are you using?

4.3.11"

What runtime/platform is your app running on?

node

What steps can reproduce the bug?

const app = new Hono()
  .get("/", async (c) => {
    const data = await readData();
    return c.json(data);
  })
  .get(
    "/filtration",
    zValidator(
      "query",
      z.object({
        pageSize: z.number().default(10),
      })
    ),
    async (c) => {
      const { pageSize } = c.req.valid("query");
      const data = await readData();
      const result = await splitArrayBySize(data, pageSize);
      return c.json(result);
    }
  );

export default app;

  client.api.issues.filtration.$get({ query: {} }).then((res) => {
    const value = res.json();
// never
  });

What is the expected behavior?

Hopefully, the result will be returned correctly

What do you see instead?

No response

Additional information

If you return objects instead, everything is fine

const app = new Hono()
  .get("/", async (c) => {
    const data = await readData();
    return c.json(data);
  })
  .get(
    "/filtration",
    zValidator(
      "query",
      z.object({
        pageSize: z.number().default(10),
      })
    ),
    async (c) => {
      const { pageSize } = c.req.valid("query");
      const data = await readData();
      const result = await splitArrayBySize(data, pageSize);
      return c.json({result});
    }
  );

export default app;

[yusukebe]

Hi, @bosens-China

I can't reproduce it. Could you provide the minimal project to reproduce it?

[bosens-China]

@yusukebe

bug like

[yusukebe]

@bosens-China Thank you!

This problem caused by result type - [number, IssuesDaum[]][] will be treated by never:

@NamesMT What do you think of this matter? [number, IssuesDaum[]][] should be valid JSON type?

[NamesMT]

Hi @yusukebe, yes it should be valid, I will make a PR soon fixing the newly added type, it wasn't actually "deep", only one level traverse.