Sourced from js-yaml's changelog.

[4.1.1] - 2025-11-12

Security

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

[4.1.0] - 2021-04-15

Added

• Types are now exported as yaml.types.XXX.
• Every type now has options property with original arguments kept as they were (see yaml.types.int.options as an example).

Changed

• Schema.extend() now keeps old type order in case of conflicts (e.g. Schema.extend([ a, b, c ]).extend([ b, a, d ]) is now ordered as abcd instead of cbad).

[4.0.0] - 2021-01-03

Changed

• Check migration guide to see details for all breaking changes.
• Breaking: "unsafe" tags !!js/function, !!js/regexp, !!js/undefined are moved to js-yaml-js-types package.
• Breaking: removed safe* functions. Use load, loadAll, dump instead which are all now safe by default.
• yaml.DEFAULT_SAFE_SCHEMA and yaml.DEFAULT_FULL_SCHEMA are removed, use yaml.DEFAULT_SCHEMA instead.
• yaml.Schema.create(schema, tags) is removed, use schema.extend(tags) instead.
• !!binary now always mapped to Uint8Array on load.
• Reduced nesting of /lib folder.
• Parse numbers according to YAML 1.2 instead of YAML 1.1 (01234 is now decimal, 0o1234 is octal, 1:23 is parsed as string instead of base60).
• dump() no longer quotes :, [, ], (, ) except when necessary, #470, #557.
• Line and column in exceptions are now formatted as (X:Y) instead of at line X, column Y (also present in compact format), #332.
• Code snippet created in exceptions now contains multiple lines with line numbers.
• dump() now serializes undefined as null in collections and removes keys with undefined in mappings, #571.
• dump() with skipInvalid=true now serializes invalid items in collections as null.
• Custom tags starting with ! are now dumped as !tag instead of !<!tag>, #576.
• Custom tags starting with tag:yaml.org,2002: are now shorthanded using !!, #258.

Added

• Added .mjs (es modules) support.
• Added quotingType and forceQuotes options for dumper to configure string literal style, #290, #529.
• Added styles: { '!!null': 'empty' } option for dumper (serializes { foo: null } as "foo: "), #570.
• Added replacer option (similar to option in JSON.stringify), #339.
• Custom Tag can now handle all tags or multiple tags with the same prefix, #385.

Fixed

... (truncated)

• cc482e7 4.1.1 released
• 50968b8 dist rebuild
• d092d86 lint fix
• 383665f fix prototype pollution in merge (<<)
• 0d3ca7a README.md: HTTP => HTTPS (#678)
• 49baadd doc: 'empty' style option for !!null
• ba3460e Fix demo link (#618)
• 2cef47b 4.1.0 released
• 810b149 dist rebuild
• 2b5620e Export built-in types, type override now preserves order
• Additional commits viewable in compare view

Sourced from xmlbuilder2's changelog.

[4.0.3] - 2025-11-01

Bug Fixes

• Fixed a bug where text-only element nodes were printed on new lines in callback mode (see #94).

[4.0.2] - 2025-11-01

Features

• Added back minified browser bundle.

[4.0.1] - 2025-10-26

Bug Fixes

• Updated dependencies.

[4.0.0] - 2025-10-08

Bug Fixes

• Fixed a bug where attributes were grouped even if the group option was not set (see #192).

BREAKING CHANGES

• Changed minimum required node.js version to 20.

[3.1.1] - 2023-05-08

Bug Fixes

• Moved @types/node to a dev dependency (see #165).
• Bumped js-yaml up from a version with a known vulnerability (see #141 and #167).

[3.1.0] - 2023-04-24

Features

• Allowed preserving blankspace text nodes when parsing an XML string (see #101).

Bug Fixes

• Fixed various ampersand encoding issues (see #105, #109, #110)

[3.0.2] - 2021-08-10

Bug Fixes

• Fixed a bug where some predefined entities where not being decoded when parsed (see #99).

... (truncated)

• 5ca638b Merge branch 'mdovhopo-master'
• 8d50e14 Bump version
• 5c122b3 Merge branch 'master' into mdovhopo-master
• 9617fcf Update changelog
• d3b76fa Merge branch 'master' into mdovhopo-master
• f7bacc3 Wait no it's actually cjs
• 2d6c7e3 Declare that the package is an ES Module
• 6f83432 remove browser source configuration, as webpack seems to be disabled
• 460b5c4 Add sponsorship links
• 6c2a110 Update funding
• Additional commits viewable in compare view

You can trigger Dependabot actions by commenting on this PR:

• @dependabot rebase will rebase this PR
• @dependabot recreate will recreate this PR, overwriting any edits that have been made to it
• @dependabot merge will merge this PR after your CI passes on it
• @dependabot squash and merge will squash and merge this PR after your CI passes on it
• @dependabot cancel merge will cancel a previously requested merge and block automerging
• @dependabot reopen will reopen this PR if it is closed
• @dependabot close will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually
• @dependabot show <dependency name> ignore conditions will show all of the ignore conditions of the specified dependency
• @dependabot ignore this major version will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this minor version will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this dependency will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)
  You can disable automated security fix PRs for this repo from the Security Alerts page.