Build: `experimental.lightningCssFeatures` exclude list not honored
#1.498 aberto em 22 de mai. de 2026
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Description
This issue was created by an agent analysing CI failures from the Next.js Deploy Suite (vinext
mainvs Next.jsv16.2.6, 2026-05-22).
Problem
Setting lightningCssFeatures to exclude light-dark() should preserve the CSS function untransformed. vinext still transforms it into var(--lightningcss-light, ...) polyfill output, ignoring the exclude config.
Excluded `light-dark()` still transformed by LightningCSS
Estimated Impact
~1 test failures across the deploy suite.
Affected Test Suites
test/e2e/app-dir/experimental-lightningcss-features/experimental-lightningcss-features.test.ts
Recommendation
-
Reproduce first in vinext's own test suite. Configure
experimental: { lightningCssFeatures: { exclude: ['light-dark'] } }and assert the function survives in the output. -
Plumb the exclude list into LightningCSS. Read
lightningCssFeatures.excludeand pass it as the correspondingexcludebitmask/options when calling LightningCSS.