Bump js-yaml and @nomicfoundation/hardhat-toolbox

[dependabot]

Bumps js-yaml to 4.2.0 and updates ancestor dependency @nomicfoundation/hardhat-toolbox. These dependencies need to be updated together.

Updates 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

Updates @nomicfoundation/hardhat-toolbox from 5.0.0 to 7.0.0

Release notes

Sourced from @​nomicfoundation/hardhat-toolbox's releases.

@​nomicfoundation/hardhat-toolbox-viem@​5.0.7

Changes

• #8339 00720e8 Thanks @​alcuadrado! - The plugin now uses definePlugin from hardhat/plugins in its index.ts, so it participates in Hardhat's new "imported but unused plugin" warning when omitted from a project's plugins array.

• Updated dependencies:

  • hardhat@3.8.0

---

💡 The Nomic Foundation is hiring! Check our open positions.

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@​nomicfoundation/hardhat-toolbox-viem@​5.0.6

Changes

• #8264 8452f97 Thanks @​alcuadrado! - Export ./package.json so consumers can import the package's manifest.

---

💡 The Nomic Foundation is hiring! Check our open positions.

---

@​nomicfoundation/hardhat-toolbox-viem@​5.0.5

Changes

• #8191 2a4ae8e Thanks @​alcuadrado! - Update how type extensions are handled to optimize the bootstrap process of Hardhat.

---

💡 The Nomic Foundation is hiring! Check our open positions.

---

Changelog

Sourced from @​nomicfoundation/hardhat-toolbox's changelog.

7.0.0

Major Changes

• 09ae6db: Deprecate the latest npm tag and redirect users to migrate to Hardhat 3 or to the hh2 tag.

Commits

• 6372d08 Version Packages
• a26e822 Remove the npm tags from the README.md files
• 18bef56 Quote the package in the installation instructions of the readmes
• e5025ae Update the formatting and quote the package in the installation instructions ...
• ee34347 Update hardhat-toolbox
• 7ade974 Version Packages
• a7e4215 feat: bump minimum version of solidity-coverage to Osaka
• e4ad0ad chore: update package metadata for provenance
• f65ee74 Version Packages
• a4f1e27 Hardhat 2 documentation links updated to reflect the domain change to v2.hard...
• Additional commits viewable in compare view

Maintainer changes

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[dependabot]

Superseded by #36.