refactor: extract postcss plugin to own file

[james-elicx]

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[james-elicx]

/bigbonk review

[pkg-pr-new]

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npm i https://pkg.pr.new/vinext@830

commit: fb2be3c

[github-actions]

Example	Preview	Production	Original
app-router-cloudflare	preview	production
pages-router-cloudflare	preview	production
app-router-playground	preview	production	original
realworld-api-rest	preview	production
nextra-docs-template	preview	production
benchmarks	preview	production
hackernews	preview	production	original

[ask-bonk]

Clean extraction. Verified:

• The logic in plugins/postcss.ts is identical to what was removed from index.ts (only naming changes: _postcssCache → postcssCache, _resolvePostcssStringPluginsUncached → resolvePostcssStringPluginsUncached, private function/const → named exports).
• index.ts imports resolvePostcssStringPlugins from the new location and drops the re-exports (_resolvePostcssStringPlugins, _postcssCache).
• Both test files now import directly from plugins/postcss.js using the public export names instead of the underscore-prefixed re-exports. No remaining references to the old names in the codebase.
• The new file has its own node:path, node:fs, node:url, and node:module imports — no missing dependencies.
• Follows the existing plugins/ directory convention alongside fonts.ts, og-assets.ts, etc.

No behavioral changes, no circular dependency risk.

[ask-bonk]

Reviewed and approved PR #830. The extraction is faithful — the PostCSS plugin resolution logic moved from index.ts to plugins/postcss.ts with no behavioral changes. The only differences are naming (dropping underscore prefixes since the functions are now proper public exports) and the new file carrying its own Node.js imports. Test imports correctly updated to point at the new module.

github run