Bump js-yaml from 4.2.0 to 5.0.0

[dependabot]

Bumps js-yaml from 4.2.0 to 5.0.0.

Changelog

Sourced from js-yaml's changelog.

[5.0.0] - 2026-06-20

Added

• Added named exports for schemas, tags, parser events and AST utilities.
• Reworked JSON_SCHEMA and CORE_SCHEMA with spec-compliant scalar resolution rules, and added YAML11_SCHEMA.
• Added realMapTag for lossless mappings with non-string and complex keys. Object-based mappings now reject complex keys instead of stringifying them.
• Added dump() transform option for changing the generated AST before rendering.
• Added dump() options seqInlineFirst, flowBracketPadding, flowSkipCommaSpace, flowSkipColonSpace, quoteFlowKeys, quoteStyle and tagBeforeAnchor.
• Added formal data layers (events and AST) for modular data pipelines.
  • Added low-level parser (to events), presenter and visitor APIs.
• Added the YAML Test Suite to the test set.

Changed

• See the migration guide for upgrade notes.
• Rewritten in TypeScript and reorganized the public API around flat named exports.
• Reduced the set of exported schemas:
  • YAML 1.2 schemas: CORE_SCHEMA (loader default), JSON_SCHEMA, FAILSAFE_SCHEMA.
  • YAML11_SCHEMA, a combination of all YAML 1.1 tags (YAML 1.1 does not specify a schema, only "types").
• load/dump default behaviour is now specified exactly via schemas:
  • load uses CORE_SCHEMA, without !!merge by default.
  • dump uses YAML11_SCHEMA + CORE_SCHEMA for the quoting check, to guarantee backward compatibility by default.
• !!set is now loaded as a JavaScript Set.
• Replaced the Type API with a tags API. Similar, but more precise and simpler. See examples for details. Tags can be defined via defineScalarTag(), defineSequenceTag() and defineMappingTag(), or as a spread + override of an existing tag.
• Renamed Schema.extend() to Schema.withTags().
• Expanded YAML 1.2 conformance and improved handling of directives, document markers, block keys, multiline scalars, tag syntax and other things.
• load() now throws on empty input instead of returning undefined.
• Moved browser builds to the js-yaml/browser export.
• Deprecated the loadAll signature with an iterator (still works, but is a candidate for removal).

Removed

• Removed deprecated safeLoad(), safeLoadAll() and safeDump() exports.
• Removed DEFAULT_SCHEMA and the nested types export.
• Removed loader options onWarning, legacy and listener.
• Removed dumper options styles, replacer, noCompatMode, condenseFlow, quotingType and forceQuotes. Renamed noArrayIndent to seqNoIndent. Formatting and representation are now configured through presenter options,

... (truncated)

Commits

• 75148bc 5.0.0 released
• 704b25d Quote document markers followed by whitespace
• 42dea28 Support complex !!pairs keys with realMapTag
• 6cf374e Fix dumping strings that collide with YAML markers
• 65b8d94 Clarify !!omap/!!pairs support
• 33e3640 Move tagname helpers to common/ and remove unused exports
• 4dd582b Cleanup export types
• 39b3792 Add types export
• 0cd01e9 docs: update for v5
• c5a61a4 Fix presenter coverage
• Additional commits viewable in compare view

[dannyvv]

@copilot Add a change file by running

• yarn install
• yarn change
  fill out the details to indicate a patch and update this PR with the results

[Copilot]

@copilot Add a change file by running

• yarn install
• yarn change
  ...

Done in commit 223461d: I ran yarn install, generated a Beachball change file with yarn change, and added a patch change entry for @microsoft/ado-npm-auth-lib.

[dannyvv]

@copilot There is an error with this change.
Verify this change via yarn install yarn ci
read the readme and release notes of 5.0.0 to see if there is any guidance on how to fix this. If non, look at the error and see how others have fixed similar issues when bumping to 5.0.0.

[Copilot]

@copilot There is an error with this change.
Verify this change via yarn install yarn ci
read the readme and release notes of 5.0.0 to see if there is any guidance on how to fix this. If non, lo...

Addressed in a2b9aa9. I investigated the failing workflow logs and reproduced with yarn install + yarn ci. Per js-yaml v5 migration guidance, I switched from default import usage to named load/dump imports in YarnRcFileProvider; validation now passes (yarn ci --no-cache).

[dependabot]

A newer version of js-yaml exists, but since this PR has been edited by someone other than Dependabot I haven't updated it. You'll get a PR for the updated version as normal once this PR is merged.