OpenAPI spec isn't generated for Zod validator

[mirismaili]

Reproduce

import {openapi} from '@elysiajs/openapi'
import {Elysia} from 'elysia'
import {z} from 'zod'

const app = new Elysia().use(openapi()).post('/', ({body}) => body, {
  body: z.object({
    name: z.literal('Lilith').describe('thing'),
  }),
  response: {
    200: z.object({
      name: z.literal('Lilith'),
    }),
    418: z.object({
      error: z.literal("I'm a teapot"),
    }),
  },
})

console.log(
  await app
    .handle(new Request('http://localhost/openapi/json'))
    .then((res) => res.json().then((spec) => JSON.stringify(spec.paths, null, 2))),
)

The output

{
  "openapi": "3.0.3",
  "info": {
    "title": "Elysia Documentation",
    "description": "Development documentation",
    "version": "0.0.0"
  },
  "paths": {
    "/": {
      "post": {
        // "requestBody" is NOT here!
        "responses": {}, // <<<--- EMPTY
        "operationId": "postIndex"
      }
    }
  },
  "components": {
    "schemas": {}
  }
}

Environment and versions:

Bun v1.2.20
"elysia": "1.4.5"
"@elysiajs/openapi": "1.4.2"
"zod": "4.1.8"

[jirapat-su]

@mirismaili , It might be the same problem.

#251 (comment)