[babel-plugin] polyfill all nonstandard properties in 'legacy-expand-…

[mellyeliu]

Adding some missing polyfills for some of the more obscure nonstandard properties we use internally. Previously these would get translated to LTR/RTL, but we need to add mappings to standard logical properties.

• borderStart
• start, end -> insetInlineStart, insetInlineEnd
• float: start, end -> float: inline-start, inline-end
• borderTopStartRadius -> borderStartStartRadius

Synced with the flag turned on and off internally, all screenshot tests passing. Added some tests to to document the expected behaviour. These tests are a bit verbose and the structure hard to navigate, and I'm hoping we can clean them up and reorganize them soon after we ship logical styles.

• transform-legacy-polyfills-test contains tests for all nonstandard properties
  • added both variants of legacy-expand-shorthands
• stylex-transform-legacy-shorthands-test.js contains all expanded shorthands
  • added enableLogicalStylesPolyfill: false tests

[github-actions]

workflow: benchmarks/perf

Comparison of performance test results, measured in operations per second. Larger is better.

[email protected] compare
node ./compare.js /tmp/tmp.ke0E8eo1dg /tmp/tmp.ZBYhtKvX4o

Results	Base	Patch	Ratio
babel-plugin: stylex.create
· basic create	529	536	1.01	+
· complex create	183	184	1.01	+
babel-plugin: stylex.createTheme
· basic themes	457	463	1.01	+
· complex themes	43	43	1.00

[github-actions]

workflow: benchmarks/size

Comparison of minified (terser) and compressed (brotli) size results, measured in bytes. Smaller is better.

[email protected] compare
node ./compare.js /tmp/tmp.PlW3KoBZkD /tmp/tmp.aPvymlS3Lp

Results	Base	Patch	Ratio
@stylexjs/stylex/lib/cjs/stylex.js
· compressed	1,222	1,222	1.00
· minified	3,679	3,679	1.00
@stylexjs/stylex/lib/cjs/inject.js
· compressed	1,227	1,227	1.00
· minified	3,224	3,224	1.00
benchmarks/size/.build/bundle.js
· compressed	537,611	537,611	1.00
· minified	7,435,904	7,435,904	1.00
benchmarks/size/.build/stylex.css
· compressed	100,509	100,509	1.00
· minified	754,513	754,513	1.00

[necolas]

Stamping to unblock. This will be faster than blocking on codemodding. And all these tests for legacy features will get deleted eventually

[mellyeliu]

Most of the common rules margin/padding/border are codemodded, but there are a few dozen stragglers from autogen code or from folders where the lint rule is not enabled. valid-styles also never had autofixes for the less common nonstandard properties, only margin/padding/border properties. Opened a PR to add autofixes for the remaining properties: #1093