deps(apps): bump i18next from 26.3.1 to 26.4.1

[dependabot]

Bumps i18next from 26.3.1 to 26.4.1.

Release notes

Sourced from i18next's releases.

v26.4.1

• fix(types): the selector-form keyPrefix overload of getFixedT() is now available under enableSelector: 'strict'. Its constraint was gated on true | 'optimize' only, so under 'strict' it collapsed to never, the overload dropped out, and the returned t silently lost its keyPrefix scope (t(($) => $.deep) failed with Property 'deep' does not exist on type '{}'). The same call already typechecked under true and 'optimize'. Thanks @​hovelopin (#2446).

v26.4.0

• perf: cache toResolveHierarchy results per (code, fallbackCode) pair. The hierarchy resolver runs on every t() call and calls Intl.getCanonicalLocales multiple times, which showed up prominently when profiling render-heavy UIs (e.g. virtualized data grids); with the cache the per-call cost drops from ~886 ns to ~41 ns. The cache is invalidated automatically when options.fallbackLng changes (reassignment or in-place array mutation); if you mutate other resolution-relevant options at runtime (load, lowerCaseLng, cleanCode, nonExplicitSupportedLngs), call i18next.services.languageUtils.clearCache() afterwards. Function-valued fallbackLng and per-call array/object fallbackLng options are never cached, so dynamic fallbacks keep working as before. Thanks @​equaterina (#2444).
• chore: update all devDependencies (Babel stays on 7.x until @rollup/plugin-babel supports 8, eslint on 9.x for neostandard). Removed the unused coveralls package (CI uses the Coveralls GitHub Action) and replaced sinon with nise + vitest.spyOn in the v1 compatibility tests, which resolves all open npm audit findings (0 vulnerabilities) and should close the dependabot alerts on the lockfile.

v26.3.6

• fix: allow TypeScript 7 in the optional typescript peer dependency range (^5 || ^6 || ^7). With typescript@7.0.2 in a project, npm install failed with an ERESOLVE peer conflict. The published types are TS7-compatible as-is: every test/typescript suite produces identical results under 6.0 and 7.0.2. Reported in react-i18next#1927, thanks @​andikapradanaarif.

v26.3.5

• fix: $t() nesting options blocks that span multiple lines are now parsed. nest() decided where the nested key ends by testing match[1] with /{.*}/, whose dot does not cross line breaks — so a $t(key, { ... }) options object containing a newline was treated as having no options, mis-split as formatters, and the nested lookup ran without its options (placeholders stayed unresolved). The nesting regexp itself already matches newlines inside $t(...); adding the s (dotAll) flag makes multiline options behave like the single-line form. Thanks @​spokodev (#2440).
• fix: getUsedParamsDetails (the returnDetails: true path) no longer mutates the passed replace object. It wrote count straight onto options.replace so the returned usedParams would include it — a caller reusing one replace object across t() calls then carried a stale count into later interpolations (e.g. a previous call's count: 5 rendered instead of the current call's value). The details are now built from a copy; usedParams still includes count. Thanks @​spokodev (#2441).
• fix: with the default skipOnVariables: true + escapeValue: true, a {{placeholder}} carried inside an interpolated value now stays literal even when the value contains escapable characters. The skip logic advanced the regex lastIndex by the raw value length, but the escaped text written into the string is longer, so lastIndex landed inside the inserted value and a trailing {{placeholder}} in it got interpolated — leaking another in-scope variable that should have stayed literal (values without escapable characters were already skipped correctly). The advance now uses the escaped length that is actually written, and the regex-safe $-doubling is applied only at the String.replace call so it can't distort the length arithmetic. Thanks @​spokodev (#2442).

v26.3.4

• fix(security): deepExtend (used by addResourceBundle(..., deep, overwrite)) no longer recurses into inherited properties. It checked key existence with the in operator, which walks the prototype chain, so a source key matching an inherited built-in (e.g. hasOwnProperty, toString) caused recursion into the shared Object.prototype function and, with overwrite: true, could overwrite e.g. Object.prototype.hasOwnProperty.call with a non-callable value — corrupting a shared built-in process-wide (DoS). Existence is now checked with Object.prototype.hasOwnProperty.call, so such keys are copied as plain own data instead. This complements the existing __proto__/constructor guard and is also strictly more correct for an own-property merge. Only affects applications that pass attacker-controlled data with deep: true and overwrite: true; no standard backend/integration does this. Distinct from CVE-2026-48713 / CVE-2026-48714 (different packages, setPath mechanism). Thanks to zx (Jace) for the responsible disclosure.

v26.3.3

• fix(types): selector t($ => $.arr, { returnObjects: true, context }) on a JSON array of heterogeneous objects now preserves each element's full shape (e.g. { transKey1: string; transKey2: string }[]) instead of collapsing to a union of partial element types. Two type-level causes: (1) FilterKeys evaluated the whole array element type at once, so keyof (A | B) only saw the keys common to every element — it now distributes over the object union and filters each element independently; (2) when TypeScript merges mismatched array element types it injects phantom optional undefined keys (e.g. transKey1_withContext?: undefined on elements that don't define it), which the context-detection helpers mistook for real context variants — they now skip keys typed as undefined. Also adds a dedicated context + returnObjects: true selector overload using const Fn + ReturnType<Fn>, so Target is no longer collapsed to unknown via ApplyTarget. Resolves Problem 1 of #2398 (Problem 2 was already fixed on master). Thanks @​sauravgupta-dotcom (#2438). Fixes #2398.

v26.3.2

• fix: chained formatters with a parenthesised option that contains the format separator (e.g. join(separator: ', ')) now work at any position in the chain, not just first. Previously the comma-in-parens reassembly only repaired formats[0], so {{v, uppercase, join(separator: ', ')}} split the join(...) option on the inner comma and never rejoined it, producing corrupt output. Replaced the first-position-only repair with a position-independent pass that re-joins fragments until each open paren closes. Thanks @​spokodev (#2437).

Changelog

Sourced from i18next's changelog.

26.4.1

• fix(types): the selector-form keyPrefix overload of getFixedT() is now available under enableSelector: 'strict'. Its constraint was gated on true | 'optimize' only, so under 'strict' it collapsed to never, the overload dropped out, and the returned t silently lost its keyPrefix scope (t(($) => $.deep) failed with Property 'deep' does not exist on type '{}'). The same call already typechecked under true and 'optimize'. Thanks @​hovelopin (#2446).

26.4.0

• perf: cache toResolveHierarchy results per (code, fallbackCode) pair. The hierarchy resolver runs on every t() call and calls Intl.getCanonicalLocales multiple times, which showed up prominently when profiling render-heavy UIs (e.g. virtualized data grids); with the cache the per-call cost drops from ~886 ns to ~41 ns. The cache is invalidated automatically when options.fallbackLng changes (reassignment or in-place array mutation); if you mutate other resolution-relevant options at runtime (load, lowerCaseLng, cleanCode, nonExplicitSupportedLngs), call i18next.services.languageUtils.clearCache() afterwards. Function-valued fallbackLng and per-call array/object fallbackLng options are never cached, so dynamic fallbacks keep working as before. Thanks @​equaterina (#2444).
• chore: update all devDependencies (Babel stays on 7.x until @rollup/plugin-babel supports 8, eslint on 9.x for neostandard). Removed the unused coveralls package (CI uses the Coveralls GitHub Action) and replaced sinon with nise + vitest.spyOn in the v1 compatibility tests, which resolves all open npm audit findings (0 vulnerabilities) and should close the dependabot alerts on the lockfile.

26.3.6

• fix: allow TypeScript 7 in the optional typescript peer dependency range (^5 || ^6 || ^7). With typescript@7.0.2 in a project, npm install failed with an ERESOLVE peer conflict. The published types are TS7-compatible as-is: every test/typescript suite produces identical results under 6.0 and 7.0.2. Reported in react-i18next#1927, thanks @​andikapradanaarif.

26.3.5

• fix: $t() nesting options blocks that span multiple lines are now parsed. nest() decided where the nested key ends by testing match[1] with /{.*}/, whose dot does not cross line breaks — so a $t(key, { ... }) options object containing a newline was treated as having no options, mis-split as formatters, and the nested lookup ran without its options (placeholders stayed unresolved). The nesting regexp itself already matches newlines inside $t(...); adding the s (dotAll) flag makes multiline options behave like the single-line form. Thanks @​spokodev (#2440).
• fix: getUsedParamsDetails (the returnDetails: true path) no longer mutates the passed replace object. It wrote count straight onto options.replace so the returned usedParams would include it — a caller reusing one replace object across t() calls then carried a stale count into later interpolations (e.g. a previous call's count: 5 rendered instead of the current call's value). The details are now built from a copy; usedParams still includes count. Thanks @​spokodev (#2441).
• fix: with the default skipOnVariables: true + escapeValue: true, a {{placeholder}} carried inside an interpolated value now stays literal even when the value contains escapable characters. The skip logic advanced the regex lastIndex by the raw value length, but the escaped text written into the string is longer, so lastIndex landed inside the inserted value and a trailing {{placeholder}} in it got interpolated — leaking another in-scope variable that should have stayed literal (values without escapable characters were already skipped correctly). The advance now uses the escaped length that is actually written, and the regex-safe $-doubling is applied only at the String.replace call so it can't distort the length arithmetic. Thanks @​spokodev (#2442).

26.3.4

• fix(security): deepExtend (used by addResourceBundle(..., deep, overwrite)) no longer recurses into inherited properties. It checked key existence with the in operator, which walks the prototype chain, so a source key matching an inherited built-in (e.g. hasOwnProperty, toString) caused recursion into the shared Object.prototype function and, with overwrite: true, could overwrite e.g. Object.prototype.hasOwnProperty.call with a non-callable value — corrupting a shared built-in process-wide (DoS). Existence is now checked with Object.prototype.hasOwnProperty.call, so such keys are copied as plain own data instead. This complements the existing __proto__/constructor guard and is also strictly more correct for an own-property merge. Only affects applications that pass attacker-controlled data with deep: true and overwrite: true; no standard backend/integration does this. Distinct from CVE-2026-48713 / CVE-2026-48714 (different packages, setPath mechanism). See advisory GHSA-6jcc-5g8w-32mx, CVSS 5.9 (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:H). Thanks to zx (Jace) @​manus-use for the responsible disclosure.

26.3.3

• fix(types): selector t($ => $.arr, { returnObjects: true, context }) on a JSON array of heterogeneous objects now preserves each element's full shape (e.g. { transKey1: string; transKey2: string }[]) instead of collapsing to a union of partial element types. Two type-level causes: (1) FilterKeys evaluated the whole array element type at once, so keyof (A | B) only saw the keys common to every element — it now distributes over the object union and filters each element independently; (2) when TypeScript merges mismatched array element types it injects phantom optional undefined keys (e.g. transKey1_withContext?: undefined on elements that don't define it), which the context-detection helpers mistook for real context variants — they now skip keys typed as undefined. Also adds a dedicated context + returnObjects: true selector overload using const Fn + ReturnType<Fn>, so Target is no longer collapsed to unknown via ApplyTarget. Resolves Problem 1 of #2398 (Problem 2 was already fixed on master). Thanks @​sauravgupta-dotcom (#2438). Fixes #2398.

26.3.2

• fix: chained formatters with a parenthesised option that contains the format separator (e.g. join(separator: ', ')) now work at any position in the chain, not just first. Previously the comma-in-parens reassembly only repaired formats[0], so {{v, uppercase, join(separator: ', ')}} split the join(...) option on the inner comma and never rejoined it, producing corrupt output. Replaced the first-position-only repair with a position-independent pass that re-joins fragments until each open paren closes. Thanks @​spokodev (#2437).

Commits

• c057ee0 26.4.1
• 02e3e16 changelog v26.4.1
• 6f198f2 fix(types): allow selector keyPrefix in getFixedT under enableSelector 'stric...
• 652847e 26.4.0
• 6c6025f prettier fix
• 742b9a9 chore: update dependencies and clean up dev tooling
• 06924d9 fix: invalidate toResolveHierarchy cache on in-place fallbackLng mutation
• bb80369 perf: cache toResolveHierarchy (#2444)
• e1c60d4 26.3.6
• 04da43e fix: allow typescript 7 in optional peerDependencies range (react-i18next#1927)
• Additional commits viewable in compare view

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Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	i18next@​26.3.1 ⏵ 26.4.1			+1	-2

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