fix: skip missing CSS modules in cache during style collection

[schiller-manuel]

Summary by CodeRabbit

• Bug Fixes
  • Improved CSS module cache handling in the development server. Missing CSS module entries are now gracefully skipped instead of causing errors, allowing the development process to continue uninterrupted.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

Configuration used: defaults

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 5f7e9e8 and bb35745.

📒 Files selected for processing (1)

• packages/start-plugin-core/src/dev-server-plugin/dev-styles.ts

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📝 Walkthrough

Walkthrough

A CSS module cache miss in the dev-styles collector now triggers a graceful skip instead of throwing an error, allowing continued processing of other modules. This changes error handling behavior to be more resilient during development server style collection.

Changes

Cohort / File(s)	Summary
CSS Module Cache Handling packages/start-plugin-core/src/dev-server-plugin/dev-styles.ts	Modified collectDevStyles to skip CSS modules with missing cache entries instead of throwing an error, with accompanying explanatory comment.

Possibly related PRs

• fix: properly handle sass in dev styles #6372: Introduces cssModulesCache and related CSS-module logic in the same dev-styles file; this PR refines error handling for cache miss scenarios introduced in that PR.

Poem

🐰 A missing cache need not cause dismay,
We skip right past and continue our way,
CSS modules flow smoother now,
With graceful skips, we take a bow! 🎀

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: handling missing CSS modules in cache by skipping them during style collection, which aligns with the file changes in dev-styles.ts.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

• 📝 Generate docstrings (stacked PR)
• 📝 Generate docstrings (commit on current branch)

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix-skip-missing-css-modules

---

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[nx-cloud]

View your CI Pipeline Execution ↗ for commit bb35745

Command	Status	Duration	Result
nx run tanstack-router-e2e-bundle-size:build --...	✅ Succeeded	1m 26s	View ↗

---

☁️ Nx Cloud last updated this comment at 2026-03-01 23:40:16 UTC

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commit: 9bf9844

[github-actions]

Bundle Size Benchmarks

• Commit: 5f7e9e872bb0
• Measured at: 2026-03-01T23:26:41.283Z
• Baseline source: history:5f7e9e872bb0
• Dashboard: bundle-size history

Scenario	Current (gzip)	Delta vs baseline	Raw	Brotli	Trend
react-router.minimal	86.58 KiB	0 B (0.00%)	272.45 KiB	75.22 KiB	▁▇▇████████
react-router.full	89.61 KiB	0 B (0.00%)	282.78 KiB	77.90 KiB	▁▇▇████████
solid-router.minimal	35.88 KiB	0 B (0.00%)	107.56 KiB	32.26 KiB	▁▆▆████████
solid-router.full	40.21 KiB	0 B (0.00%)	120.61 KiB	36.13 KiB	▁▆▆████████
vue-router.minimal	51.75 KiB	0 B (0.00%)	147.54 KiB	46.50 KiB	▁▆▆████████
vue-router.full	56.55 KiB	0 B (0.00%)	163.12 KiB	50.86 KiB	▁▅▅████████
react-start.minimal	99.11 KiB	0 B (0.00%)	311.58 KiB	85.68 KiB	▁▅▅████████
react-start.full	102.50 KiB	0 B (0.00%)	321.39 KiB	88.63 KiB	▁▅▅▇▇▇▇▇███
solid-start.minimal	48.19 KiB	0 B (0.00%)	145.13 KiB	42.67 KiB	▁▆▆████████
solid-start.full	53.68 KiB	0 B (0.00%)	161.08 KiB	47.37 KiB	▁▆▆▇▇▇▇▇███

Trend sparkline is historical gzip bytes ending with this PR measurement; lower is better.