typescript error with hono-openapi when upgrade hono to 4.6.17

[lesliechueng1996]

What version of Hono are you using?

4.6.17

What runtime/platform is your app running on? (with version if possible)

Bun workspace

What steps can reproduce the bug?

I am writing one api with hono, and openapi doc with hono-openapi.

The api like:

import { describeRoute } from 'hono-openapi';

export const validateOpenapiRoute = describeRoute({
  tags: ['api-tools'],
  description: 'Validate the openapi schema',
  responses: {
    200: {
      description: 'Successful validate the openapi schema',
      content: {
        'application/json': {
          schema: resolver(successEmptyResponseSchema),
        },
      },
    },
  },
});

apiTool.post('/validate-openapi-schema', validateOpenapiRoute, validateOpenapiValidator, async (c) => {
    const { openapiSchema } = c.req.valid('json');
 ...
});

When I use hono v4.6.16 and hono-openapi v0.4.4, everything works well.
But after I upgrade the hono to v4.6.17 ~ v4.6.20(latest), there are a lot of type error occured in the apiTool.post method.

when I hover the "validateOpenapiRoute" the error message is: 

没有与此调用匹配的重载。
  最后一个重载给出了以下错误。
    类型“MiddlewareHandler”的参数不能赋给类型“H<BlankEnv, "/validate-openapi-schema", BlankInput, HandlerResponse<any>>”的参数。
      不能将类型“MiddlewareHandler”分配给类型“MiddlewareHandler<BlankEnv, "/validate-openapi-schema", BlankInput>”。
        参数“c”和“c” 的类型不兼容。
          类型 "Context<BlankEnv, "/validate-openapi-schema", BlankInput>" 中缺少属性 "#private"，但类型 "Context<any, string, {}>" 中需要该属性。ts(2769)
context.d.ts(184, 5): 在此处声明了 "#private"。
types.d.ts(389, 5): 在此处声明最后一个重载。


when I hover the "json" in "c.req.valid('json');" the error message is: 
类型“"json"”的参数不能赋给类型“never”的参数。ts(2345)

What is the expected behavior?

No type error.

What do you see instead?

No response

Additional information

When I downgrade hono to 4.6.16, it works well.

[yusukebe]

Hi @lesliechueng1996

hono-openapi is not a Hono official project. cc: @MathurAditya724

[palmithor]

@yusukebe actually, hono/cors, which is an official hono project, has the same error

[yusukebe]

@palmithor How can I reproduce it?

[yusukebe]

No response. I'll remove the triage label and add a not bug.

[MathurAditya724]

I tried this with the latest version v4.7.2 and also v4.6.17, and it seems to be working fine.

import { Hono } from "hono";
import { describeRoute, openAPISpecs } from "hono-openapi";
import { resolver, validator as zValidator } from "hono-openapi/zod";
import * as z from "zod";

const simple = z.object({
  name: z.string(),
});

const app = new Hono();

const handler = describeRoute({
  summary: "Get all campaigns",
  responses: {
    200: {
      description: "List of campaigns",
      content: {
        "application/json": {
          schema: resolver(simple),
        },
      },
    },
  },
  operationId: "getCampaigns",
  tags: ["campaign-manager"],
});

app.get(
  "/",
  zValidator(
    "query",
    z.object({
      page: z.number().optional().default(1),
    }),
  ),
  handler,
  async (c) => {
    return c.text("Hello World");
  },
);

app.get(
  "/openapi",
  openAPISpecs(app, {
    documentation: {
      info: {
        title: "Hono",
        version: "1.0.0",
        description: "API for greeting users",
      },
      servers: [
        {
          url: "http://localhost:3000",
          description: "Local server",
        },
      ],
    },
  }),
);

If you can share a reproduction of this on StackBlitz or CodeSandbox, that would be great.