[feat] Bring back stylex.attrs

[nmn]

What changed / motivation ?

Brings back stylex.attrs which works like stylex.props but instead of returning an object with className string and a style object, it returns an object with class and style strings.

This API makes it simpler and easier to use StyleX with UI libraries such as Solid.js, Qwik.js, Svelte, Vue and others.

---

TODO:

• Looking for ways to further refactor the code to simplify and improve types.

[vercel]

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Project	Deployment	Review	Updated (UTC)
stylex	Ready	Preview, Comment	Jan 25, 2026 9:04am

[github-actions]

workflow: benchmarks/perf

Comparison of performance test results, measured in operations per second. Larger is better.
yarn workspace v1.22.22
yarn run v1.22.22
$ node ./compare.js /tmp/tmp.YU0kwlAxdd /tmp/tmp.2eAmfuXv8Y

Results	Base	Patch	Ratio
babel-plugin: stylex.create
· basic create	552	541	0.98	-
· complex create	67	66	0.99	-
babel-plugin: stylex.createTheme
· basic themes	440	437	0.99	-
· complex themes	33	34	1.03	+
Done in 0.08s.
Done in 0.31s.

[github-actions]

workflow: benchmarks/size

Comparison of minified (terser) and compressed (brotli) size results, measured in bytes. Smaller is better.
yarn workspace v1.22.22
yarn run v1.22.22
$ node ./compare.js /tmp/tmp.q2cdHfRNz7 /tmp/tmp.i19HOFFX3C

Results	Base	Patch	Ratio
@stylexjs/stylex/lib/cjs/stylex.js
· compressed	1,311	1,389	1.06	!!
· minified	4,150	4,372	1.05	!!
@stylexjs/stylex/lib/cjs/inject.js
· compressed	1,793	1,793	1.00
· minified	4,915	4,915	1.00
benchmarks/size/.build/bundle.js
· compressed	496,650	496,650	1.00
· minified	4,847,840	4,847,840	1.00
benchmarks/size/.build/stylex.css
· compressed	99,853	99,853	1.00
· minified	747,541	747,541	1.00
Done in 0.08s.
Done in 0.31s.