[unplugin] Bun support and refactor and improvements

[nmn]

What changed / motivation ?

• Add example that uses Bun.bundle and Bun.serve.
• Update unplugin package to support Bun dev servers
• Refactor unplugin package to export @stylexjs/unplugin/vite, @stylexjs/unplugin/webpack, etc.
• Improve type definitions for the unplugin package.

[vercel]

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Project	Deployment	Review	Updated (UTC)
stylex	Ready	Preview, Comment	Jan 27, 2026 4:58pm

[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.8fNN9MQsxZ /tmp/tmp.ygFxdCKtKK

Results	Base	Patch	Ratio
babel-plugin: stylex.create
· basic create	544	543	1.00	-
· complex create	68	67	0.99	-
babel-plugin: stylex.createTheme
· basic themes	446	434	0.97	-
· complex themes	35	34	0.97	-
Done in 0.08s.
Done in 0.35s.

[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.T9cjpdCB5x /tmp/tmp.7pt9IWKwNY

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 0.33s.