Useless empty JS output when bundling CSS files

[ocavue]

When bundling CSS files, tsdown will emit empty JS files that have the same basename as the output CSS files. It would be good if these useless JS file can be removed.

Minimal reproduction: https://github.com/issueset/test-tsdown-style-output

.
├── dist
│   ├── output_tsdown
│   │   ├── index.js
│   │   ├── style.css
│   │   └── style.js // ⬅️ Here is an empty JS file 
│   └── output_tsup
│       ├── index.js
│       └── style.css
├── package.json
├── src
│   ├── index.ts
│   ├── style-2.css
│   └── style.css
├── tsdown.config.mjs
└── tsup.config.mjs

[sxzz]

Related to Rolldown core

[sxzz]

Could you please raise an issue on Rolldown side?

[ocavue]

Sure. Here are upstream issues:

• [Bug]: Useless empty JS file for CSS rolldown#4259
• Feedback on native CSS support rolldown#4271