Automatic OpenAPI Type Gen fromTypes doesn't work for inferred type of body

[mirismaili]

Just add a debugging log to the official example at https://elysiajs.com/patterns/openapi#openapi-from-types:

import { Elysia, t } from 'elysia'
import { openapi } from '@elysiajs/openapi'
import { fromTypes } from '@elysiajs/openapi/gen'

export const app = new Elysia() 
    .use(
        openapi({
            references: fromTypes('src/index.ts') 
        })
    )
    .get('/', { test: 'hello' as const })
    .post('/json', ({ body, status }) => body, {
        body: t.Object({
            hello: t.String()
        })
    })
    .listen(3000)

+ console.log(JSON.stringify(fromTypes('src/index.ts')(), null, 2))

And you don't see '200' under ['/json'].post.responses alongside ['/json'].post.responses['422']:

{
  "/": {
    "get": {
      "body": {},
      "params": {
        "type": "object",
        "properties": {}
      },
      "query": {},
      "headers": {},
      "response": {
        "200": {
          "type": "object",
          "properties": {
            "test": {
              "const": "hello",
              "type": "string"
            }
          },
          "required": [
            "test"
          ]
        }
      }
    }
  },
  "/json": {
    "post": {
      "body": {
        "type": "object",
        "properties": {
          "hello": {
            "type": "string"
          }
        },
        "required": [
          "hello"
        ]
      },
      "params": {
        "type": "object",
        "properties": {}
      },
      "query": {},
      "headers": {},
      "response": {
        "422": {
          "type": "object",
          "properties": {
            "type": {
              "const": "validation",
              "type": "string"
            },
            "on": {
              "type": "string"
            },
            "summary": {
              "type": "string"
            },
            "message": {
              "type": "string"
            },
            "found": {},
            "property": {
              "type": "string"
            },
            "expected": {
              "type": "string"
            }
          },
          "required": [
            "type",
            "on"
          ]
        }
      }
    }
  }
}

Environment and versions:

Bun v1.2.20
"elysia": "1.4.5"
"@elysiajs/openapi": "1.4.2"
"typescript": "5.9.2"

[Sightless21]

you need to update your tsconfig.json file to use a modern module resolution setting that supports subpath exports like the one used by @elysiajs/openapi/gen. The recommended settings are node16, nodenext, or bundler.

{
  "compilerOptions": {
    "module": "NodeNext", 
    "moduleResolution": "nodenext",
    // other compiler options...
  }
}