[spawnia]

Prototype, not planned to merge: a per-module build so consumers bundle only the CSS of the components they use.
The measurements and the reasons against it are in the rejected-alternative fold of #338.

In our main consumer it trims each first page load by about 84 KB gzip of JS and 119 KB of CSS

The consumer, built against a packed tarball of this branch and compared with 21.0.1 across 205 lazily loaded routes, counting entry chunks plus the route's chunk group:

First page load	21.0.1	Per module
JS, gzip	1,531 KB at the entry, median route −84 KB	1,443 KB at the entry
CSS in the JS	1,013 KB	median route −119 KB
Library CSS at the entry	578 KB	454 KB

The app shell imports 33 of the 53 component styles it uses before any route loads: grid, button, menu, date-picker, table, input and more, 454 KB.
Only 103 KB moves into route chunks.
A larger gain needs the consumer to load its shell lazily, not only the library to split.

For agents 🤖: parked prototype, close when no consumer needs it

• preserveModules build, antd and dependencies external, output.paths maps antd/es for esm and antd/lib for cjs.
• scripts/antd-styles.cjs compiles one prefixed, minified stylesheet per antd component into styles/, with src/antd-variables.less imported (multiple). The compact theme must come from antd/es/style/themes/compact.less.
• A rollup plugin antdStyleImports prepends the CSS imports of each module's antd dependency closure.
• Measured on 2026-10-30 with stats from rspack build --json; scripts in scripts/limes-build.sh and scripts/route-load.py, which read and write /tmp/per-module-scripts. The consumer needs its esm/index.css import removed.
• Open: about 29 eslint errors in scripts/antd-styles.cjs, rc-picker and tslib missing from dependencies, no visual check, Storybook and the second consumer untested. Measuring scripts were in /tmp/per-module-scripts, not committed.

🤖 Generated with Claude Code