Elysia OpenAPI doens't work with zod union

[Vicentesan]

Based on the following code, Swagger does not return the response object on the /openapi page:

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

const app = new Elysia()
  .use(openapi({ mapJsonSchema: { zod: z.toJSONSchema } }))
  .get('/hey', c => c.status(200, 'hey'), {
    response: {
      200: z.union([z.literal('hey'), z.undefined()]),
    },
  });

app.listen(3000);

[Vicentesan]

Btw it does work with typebox:

[Vicentesan]

same for z.custom

[JeffersonCarvalh0]

Same for z.void() or z.undefined() (when trying to describe an empty response body, for example)