fix(vite-plugin): prevent extra style module invalidations when using PostCSS

[kosmotema]

Currently the CSS code that was processed with PostCSS (cssSource) is written to the cssMap cache:

vanilla-extract/packages/vite-plugin/src/index.ts

Line 241 in 2755282

cssMap.set(absoluteId, cssSource);

However, the invalidation uses the source code that was not processed by PostCSS (source):

vanilla-extract/packages/vite-plugin/src/index.ts

Line 217 in 2755282

cssMap.get(absoluteId) !== source

This results in unnecessary invalidation of those modules that may not have changed.

[changeset-bot]

🦋 Changeset detected

Latest commit: 5798d16

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@vanilla-extract/vite-plugin	Patch

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[askoufis]

Thanks for the fix!