Bump immutable from 5.1.5 to 5.1.9

[dependabot]

Bumps immutable from 5.1.5 to 5.1.9.

Release notes

Sourced from immutable's releases.

v5.1.9

What's Changed

• fix(List): preserve undefined values when grown past 32 elements by @​spokodev / @​jdeniau in immutable-js/immutable-js#2235 (originated from immutable-js/immutable-js#2230 )

Full Changelog: immutable-js/immutable-js@v5.1.8...v5.1.9

v5.1.8

What's Changed

• fix(List): guard oversized bounds in setListBounds. Fixes CVE GHSA-v56q-mh7h-f735
• perf(Map): index large hash-collision buckets for faster lookups. Fixes CVE GHSA-xvcm-6775-5m9r

Full Changelog: immutable-js/immutable-js@v5.1.7...v5.1.8

v5.1.7

What's Changed

• fix(Repeat): lastIndexOf returned size instead of size - 1 by @​chatman-media in immutable-js/immutable-js#2227

internal

• Backport tests from 6.x branch by @​jdeniau in immutable-js/immutable-js#2199
• fix(IndexedCollection): has(index) on a lazy Seq of unknown size now checks index existence instead of searching for a value equal to the index by @​jdeniau in immutable-js/immutable-js#2203
• Better type for reduce if not ininitial value is given by @​jdeniau in immutable-js/immutable-js#2205
• Backport test from #2193 by @​jdeniau in immutable-js/immutable-js#2207
• backport tests from 6.x by @​jdeniau in immutable-js/immutable-js#2213
• Firefox link to non-French page by @​jdeniau in immutable-js/immutable-js#2219
• Bump esbuild and @​size-limit/preset-small-lib by @​dependabot[bot] in immutable-js/immutable-js#2217
• backport tests from #2210 by @​jdeniau in immutable-js/immutable-js#2214
• Bump shell-quote from 1.8.2 to 1.8.4 by @​dependabot[bot] in immutable-js/immutable-js#2211
• Bump @​tootallnate/once from 2.0.0 to 2.0.1 by @​dependabot[bot] in immutable-js/immutable-js#2190
• Bump minimatch from 9.0.5 to 9.0.9 by @​dependabot[bot] in immutable-js/immutable-js#2189
• Bump @​codemirror/theme-one-dark from 6.1.2 to 6.1.3 by @​dependabot[bot] in immutable-js/immutable-js#2168
• Bump form-data from 4.0.5 to 4.0.6 by @​dependabot[bot] in immutable-js/immutable-js#2220
• Bump typescript-eslint from 8.33.0 to 8.61.1 by @​dependabot[bot] in immutable-js/immutable-js#2222
• Bump @​rollup/plugin-commonjs from 28.0.2 to 29.0.3 by @​dependabot[bot] in immutable-js/immutable-js#2224

New Contributors

• @​chatman-media made their first contribution in immutable-js/immutable-js#2227

Full Changelog: immutable-js/immutable-js@v5.1.6...v5.1.7

v5.1.6

What's Changed

• fix(reverseFactory): read reversedSequence.size in __iterator instead of this by @​jdeniau in immutable-js/immutable-js#2196

... (truncated)

Changelog

Sourced from immutable's changelog.

5.1.9

• fix(List): a List grown past 32 elements while all its values are undefined no longer reads those values back as null (affected get, iteration, toArray, equals and hashCode)

5.1.8

• fix(List): guard oversized bounds in setListBounds. Fixes CVE GHSA-v56q-mh7h-f735
• perf(Map): index large hash-collision buckets for faster lookups. Fixes CVE GHSA-xvcm-6775-5m9r

4.3.9

• fix(List): guard oversized bounds in setListBounds. Fixes CVE GHSA-v56q-mh7h-f735
• perf(Map): index large hash-collision buckets for faster lookups. Fixes CVE GHSA-xvcm-6775-5m9r

5.1.7

• fix(Repeat): lastIndexOf returned size instead of size - 1 by @​chatman-media in immutable-js/immutable-js#2227. Fixes CVE CVE-2026-29063
• fix(IndexedCollection): has(index) on a lazy Seq of unknown size now checks index existence instead of searching for a value equal to the index #2203
• [TypeScript]: reduce/reduceRight without an initial value now infer the result type from the collection's values when the reducer returns a value (e.g. list.reduce((a, b) => a + b) infers number), matching Array#reduce. Previously an explicit type argument was required. #2205

5.1.6

• fix(reverseFactory): read reversedSequence.size in __iterator instead of this #2196

Commits

• 329f7a6 5.1.9
• 21fabd9 changelog
• 009164f Merge pull request #2235 from immutable-js/fix/avoid-null-when-setsize33
• 5b65bfb fix(List): preserve undefined values when grown past 32 elements
• 50bf39e Update CHANGELOG.md for versions 5.1.8 and 4.3.9
• 6496539 5.1.8
• 808a83a Merge commit from fork
• e51d49f perf(Map): index large hash-collision buckets for faster lookups
• 25c58b0 fix typescript in tests
• a1a1ee4 Merge commit from fork
• Additional commits viewable in compare view

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Note

Low Risk
Dependency resolution change only with no direct app code edits; patch-level transitive upgrade with security fixes is generally low risk, though behavior of List/Map edge cases could shift slightly if those APIs are used indirectly through Sass tooling.

Overview
Updates the resolved immutable package in yarn.lock from 5.1.5 to 5.1.9 (still satisfying sass’s immutable@^5.1.5 range). There are no application source changes—only the lockfile entry for tarball URL and integrity hash.

The newer release line includes security fixes in 5.1.8 (List bounds guarding and Map hash-collision lookup hardening) plus a List correctness fix in 5.1.9 for undefined values when a list grows past 32 elements.

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