Zod-OpenAPI no longer works with Hono 4.3.0

[bruceharrison1984]

After upgrading Hono to 4.3.0, OpenAPI no longer appears to match response types.

export const userRoutes = app.openapi(
  createRoute({
    method: 'get',
    path: '/',
    tags: ['user'],
    security: [{ Bearer: [] }],
    request: {
      query: z.object({ limit: z.number(), offset: z.number() }),
    },
    responses: {
      200: {
        content: {
          'application/json': {
            schema: z.array(selectSchema),
          },
        },
        description: 'list of user',
      },
    },
  }),
  async (c) => {
    const { limit, offset } = c.req.queries();
    const resource = await c.var.MY_REPOSITORY.user.getAll(
      Number.parseInt(limit[0]),
      Number.parseInt(offset[0])
    );
    return c.json(resource, 200);
  }
);

Downgrading Hono back to 4.2.5 fixes the types again:

[yusukebe]

@bruceharrison1984

Thanks! We have to fix this issue.

Hi @NamesMT, are you interested in this Zod OpenAPI? If so, please check this issue. But I will be able to take a look later.

[NamesMT]

Seems to be since 8129a3a - (4 days ago) feat(rpc): Add status code to response type

Will try to see if I can fix it, I'm going for lunch now.

[NamesMT]

Okay, so on 4.3.0 we have two types breaking on ToSchema:

• Update from O is output to extends TypedResponse - 8129a3a
• Update from I accepting Input['in'] to Input - ea4e998

Previously I thought ToSchema is only for internal use so I didn't think much about it, but if it is exposed for other libraries I think we should revert ToSchema and creates a new ToSchemaV2 for future uses to revert the breaking changes?

[NamesMT]

I will try to make a fast hotfix first to introduce some compatibility with older version that we can quick release.
Then we can create an issue to discuss the matter above ^

[yusukebe]

@NamesMT

Okay, thanks!

[NamesMT]

honojs/hono#2605 will solve this after merge

[yusukebe]

Hi @bruceharrison1984

Thanks to @NamesMT , this has been fixed with the new version 4.3.1. Try it.