Allow using build.cssCodeSplit option in vite.config

Describe the problem

I use Tailwind to style my SvelteKit application. 95% of the styles end up in one CSS file. However, for some components, Tailwind utilities are not sufficient, and I write custom CSS.

These custom CSS styles are minimal, yet they end up in a separate CSS file, requiring an additional request. This happens for each component that requires custom styling.

Vite provides an option to turn off css code splitting with cssCodeSplit. However, this option is overridden by SvelteKit and cannot be turned off.

Describe the proposed solution

I would like to be able to turn off cssCodeSplit in vite config.

Alternatives considered

I could define my custom styles in my tailwind styles, then they'll end up in one file. However, I'd like to keep the styles and the components together.

Importance

would make my life easier

Additional Information

This issue has been brought up in a discussion before, where the problem is explain well.

Start by tracing how SvelteKit handles Vite's build.cssCodeSplit option and compare that behavior with the linked Vite configuration documentation. Verify the result by building an application with component CSS and checking whether the generated styles are combined as requested.