feat: add CSS code splitting support#654
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sxzz merged 15 commits intorolldown:mainfrom Dec 26, 2025
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that's so cool ! |
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Description
This PR adds CSS code splitting support to
tsdown, allowing users to merge all CSS files into a singlestyle.cssfile whencssCodeSplit: falseis enabled.Motivation:
Bundlers typically don't automatically import CSS files, which creates complexity for library developers using Vue SFCs when building async components. After reviewing Vite's implementation, I ported their
cssCodeSplitoption totsdownto simplify CSS handling for library consumers.Implementation:
cssCodeSplitconfiguration option (defaults totrueto preserve existing behavior)Additional context
Testing scope:
I primarily work with Vue development, so this feature has been tested in Vue projects.
Default value consideration:
Given that
tsdownis primarily used as a library bundler, there might be a case for makingcssCodeSplit: falsethe default value, as it simplifies CSS handling for library consumers.Credits:
This implementation is based on Vite's CSS code splitting feature.