Empty export in type definition file: type definition file is ignored

[rtritto]

Problem

After build there is a warning log:

Generated an empty chunk: "types.d".

The export in the type definition file is empty:

// /dist/types.d.mts
export {  }

Notes

• seems that types.d.ts is ignored by pkgroll
• same behaviour changing package.json:

  • {
      "types": "./dist/types.d.ts"
      "exports": {
        "types": "./dist/types.d.ts"
      }
    }

  • {
      "types": "./dist/index.d.ts"
      "exports": {
        "types": "./dist/index.d.ts"
      }
    }

  • {
      "types": "./dist/index.d.mts"
      "exports": {
        "types": "./dist/index.d.mts"
      }
    }

• PnP (Plug'n'Play) is enabled with Yarn Berry (should not be relevant)
• is generated without type definition file (as default, maybe should be generated a types.d.ts if export(s) is index.js or types.d.mts if export(s) is index.mjs)

Expected behavior

/dist/types.d.mts file contains related type definition:

declare function getValue(value: StringOrNumber): StringOrNumber;

export { getValue };

Minimal reproduction URL

https://github.com/rtritto/test-pkgroll/tree/bug-type-definition

Version

2.5.0

Node.js version

22.9.0

Package manager

yarn

Operating system

Windows

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