fix: migrate to js-yaml v5

[DmitryAnansky]

What/Why/How?

Upgraded js-yaml from v4 to v5. This fixes bundling of strings that look like numbers with underscores (e.g. '12_34'): they are now kept quoted in YAML output instead of being emitted unquoted and read back as numbers by YAML 1.1 parsers.

Breaking change: js-yaml v5 parses YAML more strictly. A multi-line flow collection whose closing bracket is indented to (or below) the level of its parent key is now a parse error. For example, this no longer parses and must be reindented:

example: { 'a': 'test' } # <- move the closing brace to the right of `example:`

All other scalar resolution (hex/octal/leading-zero integers, capitalized booleans, ~ as null, dates kept as strings) and the handling of empty/comment-only documents are unchanged.

Reference

#2906

Alternative

#2907

Testing

Screenshots (optional)

Check yourself

• This PR follows the contributing guide
• All new/updated code is covered by tests
• Core code changed? - Tested with other Redocly products (internal contributions only)
• New package installed? - Tested in different environments (browser/node)
• Documentation update has been considered

Security

• The security impact of the change has been considered
• Code follows company security practices and guidelines

[changeset-bot]

🦋 Changeset detected

Latest commit: a078710

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

Name	Type
@redocly/openapi-core	Patch
@redocly/cli	Patch
@redocly/respect-core	Patch

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[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	81.38% (🎯 81%)	7408 / 9102
🔵	Statements	80.74% (🎯 80%)	7701 / 9537
🔵	Functions	84.57% (🎯 84%)	1475 / 1744
🔵	Branches	73.09% (🎯 73%)	5012 / 6857

File Coverage

File	Stmts	Branches	Functions	Lines	Uncovered Lines
Changed Files
packages/core/src/js-yaml/index.ts	90%	66.66%	100%	88.88%	29

Generated in workflow #10409 for commit a078710 by the Vitest Coverage Report Action

[github-actions]

📦 A new experimental 🧪 version v0.0.0-snapshot.1782145948 of Redocly CLI has been published for testing.

Install with NPM:

npm install @redocly/cli@0.0.0-snapshot.1782145948

⚠️ Note: This is a development build and may contain unstable features.

[tatomyr]

Please test this in the VSCE.

[DmitryAnansky]

@vadyvas please take a look.

[DmitryAnansky]

Performance Benchmark fails due to indentation, already notified the OAS description owners.

[github-actions]

📦 A new experimental 🧪 version v0.0.0-snapshot.1782209756 of Redocly CLI has been published for testing.

Install with NPM:

npm install @redocly/cli@0.0.0-snapshot.1782209756

⚠️ Note: This is a development build and may contain unstable features.