Unreasonably long bundling time after updating rollup-plugin-css-only from 3.1.0 to 4.2.0

[Snailedlt]

Hi, we're using this project in a government project written in svelte. After updating rollup-plugin-css-only from 3.1.0 to 4.2.0 we're experiencing a significant increase in the bundling time.

After running npm i and npm run dev with the following setup "dev": "rollup -c -w", it runs in 5min instead of 12 seconds. The same happens with npm run build with the following setup "build": "rollup -c"

The only changes done were to package.json and package-lock.json (PR by dependabot), so we are sure the issue is with this plugin, but not sure exactly what the issue is.

Before updating: 12.2s

After updating: 5m 16s

The project is private, so I can't share much, but here's some config files we use, which may or may not be relevant:
project_config_files.zip

Let me know if you need any more info, and I'll try to provide it quickly

[thgh]

Interesting that dependabot suggests major upgrades. I could release a minor upgrade to v3 with only rollup 3 support?

[Snailedlt]

Does that mean it should not have suggested that update to us? If so, why not... and do you know why bundling takes so long?

[Snailedlt]

Also I see v4 brought some breaking changes, but couldn't find any info on what needs to be changed in order to make it work again. Is the migration process documented anywhere?

[thgh]

To be honest, I'm not using this module/Rollup anymore. The main change is that you should replace the output option with the name or filename option.

[Snailedlt]

Ahh, okey :)
You're talking about this then, right? :)
css({ output: 'bundle.css' })

Should it be replaced with this?
css({ filename: 'bundle.css' })

[nikolas]

I ran into this problem, too. Downgrading to version 3.1.x fixed the problem. ccnmtl/3demos#90

[nikolas]

Using the new version (4.2.0), css({ filename: 'bundle.css' }) doesn't seem to fix the problem, either. I think I will just stick with the old version.

[thgh]

Using v3 is fine, v4 is just there because Rollup provided a new API that may be more powerful.