chore(deps): update dependency happy-dom to v20.4.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
happy-dom	20.3.9 → 20.4.0

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Release Notes

capricorn86/happy-dom (happy-dom)

v20.4.0

Compare Source

🎨 Features

• Adds support for caching the compiled code of EcmaScript modules - By @​capricorn86 in task #​2049

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Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

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♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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This PR was generated by Mend Renovate. View the repository job log.

[railway-app]

🚅 Deployed to the simon.dev-pr-1545 environment in simon.dev

Service	Status	Web	Updated (UTC)
simon.dev	✅ Success (View Logs)	Web	Jan 27, 2026 at 10:49 pm

[claude]

Claude finished @renovate[bot]'s task in 1m 50s —— View job

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Code Review Complete ✅

I've reviewed the happy-dom dependency update from v20.3.9 to v20.4.0.

Summary

This is a safe and recommended upgrade. The CI pipeline has passed successfully, and the changes are minimal and well-scoped.

Review Findings

✅ Changes Review

• Scope: Only updates happy-dom in package.json (line 63) and corresponding lockfile entries
• Version Type: Minor version bump (20.3.9 → 20.4.0) - backwards compatible
• Changed Files: 2 files (package.json, pnpm-lock.yaml)

✅ Release Notes Analysis

The v20.4.0 release adds a single feature:

• New Feature: EcmaScript module compilation caching (#2049)
• Impact: Performance improvement for test runs - compiled modules will be cached
• Breaking Changes: None

✅ CI Status

• CI Pipeline: ✅ Passed
• PR Deployment: ✅ Passed
• All automated checks completed successfully

📝 Code Quality

• Dependency Type: DevDependency (test environment only)
• Risk Level: Low - test-only dependency with no production impact
• Lockfile: Properly updated with integrity hashes

Recommendations

Approve and merge - This update:

1. Adds performance improvements through module caching
2. Has no breaking changes
3. Passes all CI checks
4. Only affects the test environment (happy-dom is used as the Vitest test environment per CLAUDE.md)

The new caching feature should improve test execution speed over time as compiled modules are reused across test runs.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.76%. Comparing base (7a9c210) to head (1b24c6f).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1545   +/-   ##
=======================================
  Coverage   97.76%   97.76%           
=======================================
  Files          49       49           
  Lines         896      896           
  Branches      156      156           
=======================================
  Hits          876      876           
  Misses          8        8           
  Partials       12       12           

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