[sxzzbot]

AI usage

• No AI was used in this PR.
• AI was used: Claude Code + Claude Opus 5.5
  • I have carefully reviewed the AI-generated content myself.

Description

With unbundle: true, CJS output kept a require() to a removed pure CSS chunk, so it couldn't be loaded. This removes it, following Vite's getEmptyChunkReplacer.

It also prepares for rolldown/rolldown#11410, which keeps non-JS extensions in [name] (card.css.cjs). Without the toCssFileName change, that Rolldown emits card.css.css. Published tsdown allows it through ~1.2.15, so this should ship before the next Rolldown release.

Linked Issues

Refs #912

The Card2.cjs name goes away with rolldown/rolldown#11410, so #912 can be closed after that upgrade.

Additional context

Alternative to #1077. Tested against both Rolldown 1.2.15 and pkg.pr.new/rolldown@main. Upgrading Rolldown will need updates to the css > unbundle and unbundle > base dir snapshots and the JSON Schema.

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[pkg-pr-new]

Open in StackBlitz

tsdown

pnpm add https://pkg.pr.new/rolldown/tsdown@1114 -D

npm i https://pkg.pr.new/rolldown/tsdown@1114 -D

yarn add https://pkg.pr.new/rolldown/tsdown@1114.tgz -D

create-tsdown

pnpm add https://pkg.pr.new/rolldown/tsdown/create-tsdown@1114 -D

npm i https://pkg.pr.new/rolldown/tsdown/create-tsdown@1114 -D

yarn add https://pkg.pr.new/rolldown/tsdown/create-tsdown@1114.tgz -D

@tsdown/css

pnpm add https://pkg.pr.new/rolldown/tsdown/@tsdown/css@1114 -D

npm i https://pkg.pr.new/rolldown/tsdown/@tsdown/css@1114 -D

yarn add https://pkg.pr.new/rolldown/tsdown/@tsdown/css@1114.tgz -D

@tsdown/exe

pnpm add https://pkg.pr.new/rolldown/tsdown/@tsdown/exe@1114 -D

npm i https://pkg.pr.new/rolldown/tsdown/@tsdown/exe@1114 -D

yarn add https://pkg.pr.new/rolldown/tsdown/@tsdown/exe@1114.tgz -D

tsdown-migrate

pnpm add https://pkg.pr.new/rolldown/tsdown/tsdown-migrate@1114 -D

npm i https://pkg.pr.new/rolldown/tsdown/tsdown-migrate@1114 -D

yarn add https://pkg.pr.new/rolldown/tsdown/tsdown-migrate@1114.tgz -D

commit: 9ab935d