[babel-plugin] Allow -- prefixed keys in defineConsts to preserve user-authored names

[mellyeliu]

Context

Similar to defineVars, keys starting with -- now preserve the user-authored name instead of being hashed. Mainly for flexibility though it comes with some safety risks.

[vercel]

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Project	Deployment	Review	Updated (UTC)
stylex	Ready	Preview, Comment	Jan 22, 2026 6:57am

[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.WRLGBqbcdZ /tmp/tmp.Yp5PG9hxjV

Results	Base	Patch	Ratio
@stylexjs/stylex/lib/cjs/stylex.js
· compressed	1,311	1,311	1.00
· minified	4,150	4,150	1.00
@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 0.32s.

[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.vrvCNsylCj /tmp/tmp.rq9LygkNNi

Results	Base	Patch	Ratio
babel-plugin: stylex.create
· basic create	523	512	0.98	-
· complex create	63	61	0.97	-
babel-plugin: stylex.createTheme
· basic themes	429	395	0.92	!!
· complex themes	33	32	0.97	-
Done in 0.09s.
Done in 0.35s.