fix(swingset): preserve Mosaic colors in production builds by austincalvelage · Pull Request #9283 · clerk/javascript

austincalvelage · 2026-07-30T02:56:36Z

Description

In production Lightning CSS sees light-dark() and tries to convert it for older browsers. That conversion doesn’t work correctly with StyleX’s extracted variables, so the colors become invalid.

The config tells Lightning CSS that Mosaic targets browsers that already support light-dark() so it leaves the colors unchanged.

parcel-bundler/lightningcss#873 (comment)

Checklist

pnpm test runs as expected.
pnpm build runs as expected.
(If applicable) JSDoc comments have been added or updated for any package exports
(If applicable) Documentation has been updated

Type of change

changeset-bot · 2026-07-30T02:56:40Z

🦋 Changeset detected

Latest commit: 5ef5431

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

This PR includes changesets to release 0 packages

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vercel · 2026-07-30T02:56:42Z

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Project	Deployment	Actions	Updated (UTC)
clerk-js-sandbox	Ready	Preview	Jul 30, 2026 3:04am
swingset	Ready	Preview	Jul 30, 2026 3:04am

coderabbitai · 2026-07-30T02:59:05Z

📝 Walkthrough

Walkthrough

Adds a shared mosaicLightningCssTargets configuration for browser versions and uses it in both the tsdown Mosaic configuration and Swingset’s Next.js StyleX plugin configuration. The shared configuration replaces the previous inline target calculation in tsdown. A Changesets entry is also added.

Estimated code review effort: 2 (Simple) | ~10 minutes

Suggested reviewers: alexcarpenter, maxyinger

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title matches the main change: fixing Swingset production builds to preserve Mosaic colors.
Description check	✅ Passed	The description is directly related and correctly explains the Lightning CSS target change and its purpose.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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pkg-pr-new · 2026-07-30T02:59:30Z

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commit: 5ef5431

github-actions · 2026-07-30T03:00:02Z

API Changes Report

Generated by Break Check on 2026-07-30T03:04:12.618Z

Summary

Metric	Count
Packages analyzed	19
Packages with changes	0
🔴 Breaking changes	0
🟡 Non-breaking changes	0
🟢 Additions	0

No API Changes Detected

All packages have stable APIs with no detected changes.

Report generated by Break Check

_{Last ran on 5ef5431.}

coderabbitai

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In @.changeset/bright-glasses-hammer.md:
- Around line 1-2: Add the affected package entries and appropriate semver bump
levels to the changeset frontmatter, then write a concise release summary
describing the production Lightning CSS configuration change. Keep the changeset
valid for changeset version and publish workflows.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

Push a commit to this branch (recommended)
Create a new PR with the fixes

ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository YAML (base), Organization UI (inherited)

Review profile: CHILL

Plan: Pro Plus

Run ID: a3df5ae5-5c02-4365-b43b-7ff458091164

📥 Commits

Reviewing files that changed from the base of the PR and between 3233803 and 5ef5431.

📒 Files selected for processing (1)

.changeset/bright-glasses-hammer.md

🔗 Linked repositories identified

CodeRabbit considers these linked repositories for cross-repo context during reviews:

clerk/clerk_go (manual)
clerk/dashboard (manual)
clerk/accounts (manual)
clerk/backoffice (manual)
clerk/clerk (manual)
clerk/clerk-docs (manual)
clerk/cloudflare-workers (manual)
clerk/clerk-ios (auto-detected)
clerk/clerk-android (auto-detected)
clerk/cli (auto-detected)

coderabbitai · 2026-07-30T03:04:26Z

+---
+---


🗄️ Data Integrity & Integration | 🟠 Major | ⚡ Quick win

Add the affected package bumps and release summary.

This changeset is empty, so changeset version/publish will not release or document the production Lightning CSS configuration change. Add the affected package names, appropriate semver bumps, and a concise summary.

As per coding guidelines, Changesets must be used for version management and changelogs.

🤖 Prompt for AI Agents

Verify each finding against current code. Fix only still-valid issues, skip the rest with a brief reason, keep changes minimal, and validate. In @.changeset/bright-glasses-hammer.md around lines 1 - 2, Add the affected package entries and appropriate semver bump levels to the changeset frontmatter, then write a concise release summary describing the production Lightning CSS configuration change. Keep the changeset valid for changeset version and publish workflows.

Source: Coding guidelines

fix(swingset): preserve Mosaic colors in production builds

3233803

austincalvelage requested review from alexcarpenter and maxyinger July 30, 2026 02:56

github-actions Bot added the ui label Jul 30, 2026

maxyinger approved these changes Jul 30, 2026

View reviewed changes

chore(repo): add empty changeset

5ef5431

vercel Bot deployed to Preview – clerk-js-sandbox July 30, 2026 03:02 View deployment

vercel Bot deployed to Preview – swingset July 30, 2026 03:04 View deployment

coderabbitai Bot reviewed Jul 30, 2026

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alexcarpenter merged commit a90a93b into main Jul 30, 2026
52 checks passed

alexcarpenter deleted the austin/stylex-lighning-css-fix branch July 30, 2026 12:32

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fix(swingset): preserve Mosaic colors in production builds - #9283

fix(swingset): preserve Mosaic colors in production builds#9283
alexcarpenter merged 2 commits into
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austin/stylex-lighning-css-fix

austincalvelage commented Jul 30, 2026

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austincalvelage commented Jul 30, 2026

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