Bump js-yaml from 4.1.0 to 4.2.0

[dependabot]

Bumps js-yaml from 4.1.0 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

[4.1.1] - 2025-11-12

Security

• Fix prototype pollution issue in yaml merge (<<) operator.

Commits

• 590dbab 4.2.0 released
• f944dc5 Add package.json funding field
• f692719 Changelog update
• 9971a06 Fix digits in YAML named tag handles
• 464a5b8 Fix flow scalar trailing whitespace folding, close #307
• 1fda4f7 Tests for #567, #565
• 031ad07 Stop resolving numbers with underscores as numeric scalars, #627
• e46d223 CI config update
• 9023fee Add lockfile
• 990e6f4 Docs update
• Additional commits viewable in compare view

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Summary by cubic

Upgrade js-yaml to 4.2.0 for security hardening and stricter, more predictable YAML parsing. This adds safer loader defaults and fixes several parsing edge cases.

• Dependencies

  • Bumped js-yaml 4.1.0 → 4.2.0.
  • Includes security fixes (merge DoS/prototype pollution), new loader limits (maxDepth 100, maxMergeSeqLength 20), and no longer treats numbers with underscores as numeric scalars.

• Migration

  • YAML values like 1_000 now parse as strings; update data or normalize after parsing if needed.
  • For very deep or large merged YAML, raise maxDepth/maxMergeSeqLength via loader options if you hit limits.

^{Written for commit ac8fc8c. Summary will update on new commits.}

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