build(deps): bump js-yaml from 4.1.1 to 4.2.0 in /tests/functional

[dependabot]

Bumps js-yaml from 4.1.1 to 4.2.0.

Changelog

Sourced from js-yaml's changelog.

[4.2.0] - 2026-06-01

Added

• Added docs/safety.md with notes about processing untrusted YAML.
• Added maxDepth (100) loader option. Not a problem, but gives a better exception instead of RangeError on stack overflow.
• Added maxMergeSeqLength (20) loader option. Not a problem after merge fix, but an additional restriction for safety.
• Added sourcemaps to dist/ builds.

Changed

• Stop resolving numbers with underscores as numeric scalars, #627.
• Switched dev toolchains to Vite / neostandard.
• Updated demo.
• Reorganized tests.
• dist/ files are no longer kept in the repository.

Fixed

• Fix parsing of properties on the first implicit block mapping key, #62.
• Fix trailing whitespace handling when folding flow scalar lines, #307.
• Reject top-level block scalars without content indentation, #280.
• Ensure numbers survive round-trip, #737.
• Fix test coverage for issue #221.
• Fix flow scalar trailing whitespace folding, #307.
• Fix digits in YAML named tag handles.

Security

• Fix potential DoS via quadratic complexity in merge - deduplicate repeated elements (makes sense for malformed files > 10K).

[3.14.2] - 2025-11-15

Security

• Backported v4.1.1 fix to v3

Commits

• See full diff in compare view

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Dependency Bump Evaluation

Version change: js-yaml 4.1.1 -> 4.2.0 (minor)
Scope: Transitive dependency in tests/functional (only yarn.lock changed, not a direct import)

Changes:

• Added maxDepth (100) and maxMergeSeqLength (20) loader safety options
• Stop resolving numbers with underscores as numeric scalars (#627)
• Several YAML parsing fixes (block mapping keys, flow scalar folding, number round-trips)
• Added sourcemaps to dist builds

Breaking changes: Numbers with underscores (e.g. 1_000) are no longer parsed as numeric scalars. No YAML files in this repository use underscored numbers, and js-yaml is not directly imported in tests/functional — it is a transitive dependency.

Security concerns: None introduced. This release fixes a DoS vulnerability (quadratic complexity in merge key deduplication for malformed files >10K) and adds safety guards (maxDepth, maxMergeSeqLength).

Impact on codebase: Minimal. The only direct js-yaml import in the repo is in tests/workflows/parse-deps.spec.ts (different package scope, unaffected by this bump). No code in tests/functional directly calls yaml.load() or similar APIs.

Recommendation: SAFE TO MERGE

Notes: CI checks are still in progress at time of review. The change is limited to a lockfile update of a transitive dependency with a security fix and no breaking impact on this codebase.

— Claude Code