Bumps [i18next](https://github.com/i18next/i18next) from 26.3.1 to
26.3.6.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/i18next/i18next/releases">i18next's
releases</a>.</em></p>
<blockquote>
<h2>v26.3.6</h2>
<ul>
<li>fix: allow TypeScript 7 in the optional <code>typescript</code> peer
dependency range (<code>^5 || ^6 || ^7</code>). With
<code>typescript@7.0.2</code> in a project, <code>npm install</code>
failed with an <code>ERESOLVE</code> peer conflict. The published types
are TS7-compatible as-is: every <code>test/typescript</code> suite
produces identical results under 6.0 and 7.0.2. Reported in <a
href="https://redirect.github.com/i18next/react-i18next/issues/1927">react-i18next#1927</a>,
thanks <a
href="https://github.com/andikapradanaarif"><code>@andikapradanaarif</code></a>.</li>
</ul>
<h2>v26.3.5</h2>
<ul>
<li>fix: <code>$t()</code> nesting options blocks that span multiple
lines are now parsed. <code>nest()</code> decided where the nested key
ends by testing <code>match[1]</code> with <code>/{.*}/</code>, whose
dot does not cross line breaks — so a <code>$t(key, { ... })</code>
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 <code>$t(...)</code>; adding the <code>s</code>
(dotAll) flag makes multiline options behave like the single-line form.
Thanks <a href="https://github.com/spokodev"><code>@spokodev</code></a>
(<a
href="https://redirect.github.com/i18next/i18next/pull/2440">#2440</a>).</li>
<li>fix: <code>getUsedParamsDetails</code> (the <code>returnDetails:
true</code> path) no longer mutates the passed <code>replace</code>
object. It wrote <code>count</code> straight onto
<code>options.replace</code> so the returned <code>usedParams</code>
would include it — a caller reusing one <code>replace</code> object
across <code>t()</code> calls then carried a stale <code>count</code>
into later interpolations (e.g. a previous call's <code>count: 5</code>
rendered instead of the current call's value). The details are now built
from a copy; <code>usedParams</code> still includes <code>count</code>.
Thanks <a href="https://github.com/spokodev"><code>@spokodev</code></a>
(<a
href="https://redirect.github.com/i18next/i18next/pull/2441">#2441</a>).</li>
<li>fix: with the default <code>skipOnVariables: true</code> +
<code>escapeValue: true</code>, a <code>{{placeholder}}</code> carried
inside an interpolated value now stays literal even when the value
contains escapable characters. The skip logic advanced the regex
<code>lastIndex</code> by the raw value length, but the escaped text
written into the string is longer, so <code>lastIndex</code> landed
inside the inserted value and a trailing <code>{{placeholder}}</code> in
it got interpolated — leaking another in-scope variable that should have
stayed literal (values without escapable characters were already skipped
correctly). The advance now uses the escaped length that is actually
written, and the regex-safe <code>$</code>-doubling is applied only at
the <code>String.replace</code> call so it can't distort the length
arithmetic. Thanks <a
href="https://github.com/spokodev"><code>@spokodev</code></a> (<a
href="https://redirect.github.com/i18next/i18next/pull/2442">#2442</a>).</li>
</ul>
<h2>v26.3.4</h2>
<ul>
<li>fix(security): <code>deepExtend</code> (used by
<code>addResourceBundle(..., deep, overwrite)</code>) no longer recurses
into inherited properties. It checked key existence with the
<code>in</code> operator, which walks the prototype chain, so a source
key matching an inherited built-in (e.g. <code>hasOwnProperty</code>,
<code>toString</code>) caused recursion into the shared
<code>Object.prototype</code> function and, with <code>overwrite:
true</code>, could overwrite e.g.
<code>Object.prototype.hasOwnProperty.call</code> with a non-callable
value — corrupting a shared built-in process-wide (DoS). Existence is
now checked with <code>Object.prototype.hasOwnProperty.call</code>, so
such keys are copied as plain own data instead. This complements the
existing <code>__proto__</code>/<code>constructor</code> guard and is
also strictly more correct for an own-property merge. Only affects
applications that pass attacker-controlled data with <code>deep:
true</code> and <code>overwrite: true</code>; no standard
backend/integration does this. Distinct from CVE-2026-48713 /
CVE-2026-48714 (different packages, <code>setPath</code> mechanism).
Thanks to zx (Jace) for the responsible disclosure.</li>
</ul>
<h2>v26.3.3</h2>
<ul>
<li>fix(types): selector <code>t($ => $.arr, { returnObjects: true,
context })</code> on a JSON array of <strong>heterogeneous</strong>
objects now preserves each element's full shape (e.g. <code>{ transKey1:
string; transKey2: string }[]</code>) instead of collapsing to a union
of partial element types. Two type-level causes: (1)
<code>FilterKeys</code> evaluated the whole array element type at once,
so <code>keyof (A | B)</code> 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 <code>undefined</code> keys (e.g.
<code>transKey1_withContext?: undefined</code> on elements that don't
define it), which the context-detection helpers mistook for real context
variants — they now skip keys typed as <code>undefined</code>. Also adds
a dedicated <code>context</code> + <code>returnObjects: true</code>
selector overload using <code>const Fn</code> +
<code>ReturnType<Fn></code>, so <code>Target</code> is no longer
collapsed to <code>unknown</code> via <code>ApplyTarget</code>. Resolves
Problem 1 of <a
href="https://redirect.github.com/i18next/i18next/issues/2398">#2398</a>
(Problem 2 was already fixed on master). Thanks <a
href="https://github.com/sauravgupta-dotcom"><code>@sauravgupta-dotcom</code></a>
(<a
href="https://redirect.github.com/i18next/i18next/pull/2438">#2438</a>).
Fixes <a
href="https://redirect.github.com/i18next/i18next/issues/2398">#2398</a>.</li>
</ul>
<h2>v26.3.2</h2>
<ul>
<li>fix: chained formatters with a parenthesised option that contains
the format separator (e.g. <code>join(separator: ', ')</code>) now work
at <strong>any</strong> position in the chain, not just first.
Previously the comma-in-parens reassembly only repaired
<code>formats[0]</code>, so <code>{{v, uppercase, join(separator: ',
')}}</code> split the <code>join(...)</code> 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 <a
href="https://github.com/spokodev"><code>@spokodev</code></a> (<a
href="https://redirect.github.com/i18next/i18next/pull/2437">#2437</a>).</li>
</ul>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/i18next/i18next/blob/master/CHANGELOG.md">i18next's
changelog</a>.</em></p>
<blockquote>
<h2>26.3.6</h2>
<ul>
<li>fix: allow TypeScript 7 in the optional <code>typescript</code> peer
dependency range (<code>^5 || ^6 || ^7</code>). With
<code>typescript@7.0.2</code> in a project, <code>npm install</code>
failed with an <code>ERESOLVE</code> peer conflict. The published types
are TS7-compatible as-is: every <code>test/typescript</code> suite
produces identical results under 6.0 and 7.0.2. Reported in <a
href="https://redirect.github.com/i18next/react-i18next/issues/1927">react-i18next#1927</a>,
thanks <a
href="https://github.com/andikapradanaarif"><code>@andikapradanaarif</code></a>.</li>
</ul>
<h2>26.3.5</h2>
<ul>
<li>fix: <code>$t()</code> nesting options blocks that span multiple
lines are now parsed. <code>nest()</code> decided where the nested key
ends by testing <code>match[1]</code> with <code>/{.*}/</code>, whose
dot does not cross line breaks — so a <code>$t(key, { ... })</code>
options object containing a newline was treated as having no options,
mis-split as formatters, and the nested lookup ran without its options
(placeholders stayed unresolved). The nesting regexp itself already
matches newlines inside <code>$t(...)</code>; adding the <code>s</code>
(dotAll) flag makes multiline options behave like the single-line form.
Thanks <a href="https://github.com/spokodev"><code>@spokodev</code></a>
(<a
href="https://redirect.github.com/i18next/i18next/pull/2440">#2440</a>).</li>
<li>fix: <code>getUsedParamsDetails</code> (the <code>returnDetails:
true</code> path) no longer mutates the passed <code>replace</code>
object. It wrote <code>count</code> straight onto
<code>options.replace</code> so the returned <code>usedParams</code>
would include it — a caller reusing one <code>replace</code> object
across <code>t()</code> calls then carried a stale <code>count</code>
into later interpolations (e.g. a previous call's <code>count: 5</code>
rendered instead of the current call's value). The details are now built
from a copy; <code>usedParams</code> still includes <code>count</code>.
Thanks <a href="https://github.com/spokodev"><code>@spokodev</code></a>
(<a
href="https://redirect.github.com/i18next/i18next/pull/2441">#2441</a>).</li>
<li>fix: with the default <code>skipOnVariables: true</code> +
<code>escapeValue: true</code>, a <code>{{placeholder}}</code> carried
inside an interpolated value now stays literal even when the value
contains escapable characters. The skip logic advanced the regex
<code>lastIndex</code> by the raw value length, but the escaped text
written into the string is longer, so <code>lastIndex</code> landed
inside the inserted value and a trailing <code>{{placeholder}}</code> 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 <code>$</code>-doubling is applied only at
the <code>String.replace</code> call so it can't distort the length
arithmetic. Thanks <a
href="https://github.com/spokodev"><code>@spokodev</code></a> (<a
href="https://redirect.github.com/i18next/i18next/pull/2442">#2442</a>).</li>
</ul>
<h2>26.3.4</h2>
<ul>
<li>fix(security): <code>deepExtend</code> (used by
<code>addResourceBundle(..., deep, overwrite)</code>) no longer recurses
into inherited properties. It checked key existence with the
<code>in</code> operator, which walks the prototype chain, so a source
key matching an inherited built-in (e.g. <code>hasOwnProperty</code>,
<code>toString</code>) caused recursion into the shared
<code>Object.prototype</code> function and, with <code>overwrite:
true</code>, could overwrite e.g.
<code>Object.prototype.hasOwnProperty.call</code> with a non-callable
value — corrupting a shared built-in process-wide (DoS). Existence is
now checked with <code>Object.prototype.hasOwnProperty.call</code>, so
such keys are copied as plain own data instead. This complements the
existing <code>__proto__</code>/<code>constructor</code> guard and is
also strictly more correct for an own-property merge. Only affects
applications that pass attacker-controlled data with <code>deep:
true</code> and <code>overwrite: true</code>; no standard
backend/integration does this. Distinct from CVE-2026-48713 /
CVE-2026-48714 (different packages, <code>setPath</code> mechanism). See
advisory <a
href="https://github.com/i18next/i18next/security/advisories/GHSA-6jcc-5g8w-32mx">GHSA-6jcc-5g8w-32mx</a>,
CVSS 5.9 (<code>CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:H</code>).
Thanks to zx (Jace) <a
href="https://github.com/manus-use"><code>@manus-use</code></a> for the
responsible disclosure.</li>
</ul>
<h2>26.3.3</h2>
<ul>
<li>fix(types): selector <code>t($ => $.arr, { returnObjects: true,
context })</code> on a JSON array of <strong>heterogeneous</strong>
objects now preserves each element's full shape (e.g. <code>{ transKey1:
string; transKey2: string }[]</code>) instead of collapsing to a union
of partial element types. Two type-level causes: (1)
<code>FilterKeys</code> evaluated the whole array element type at once,
so <code>keyof (A | B)</code> 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 <code>undefined</code> keys (e.g.
<code>transKey1_withContext?: undefined</code> on elements that don't
define it), which the context-detection helpers mistook for real context
variants — they now skip keys typed as <code>undefined</code>. Also adds
a dedicated <code>context</code> + <code>returnObjects: true</code>
selector overload using <code>const Fn</code> +
<code>ReturnType<Fn></code>, so <code>Target</code> is no longer
collapsed to <code>unknown</code> via <code>ApplyTarget</code>. Resolves
Problem 1 of <a
href="https://redirect.github.com/i18next/i18next/issues/2398">#2398</a>
(Problem 2 was already fixed on master). Thanks <a
href="https://github.com/sauravgupta-dotcom"><code>@sauravgupta-dotcom</code></a>
(<a
href="https://redirect.github.com/i18next/i18next/pull/2438">#2438</a>).
Fixes <a
href="https://redirect.github.com/i18next/i18next/issues/2398">#2398</a>.</li>
</ul>
<h2>26.3.2</h2>
<ul>
<li>fix: chained formatters with a parenthesised option that contains
the format separator (e.g. <code>join(separator: ', ')</code>) now work
at <strong>any</strong> position in the chain, not just first.
Previously the comma-in-parens reassembly only repaired
<code>formats[0]</code>, so <code>{{v, uppercase, join(separator: ',
')}}</code> split the <code>join(...)</code> 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 <a
href="https://github.com/spokodev"><code>@spokodev</code></a> (<a
href="https://redirect.github.com/i18next/i18next/pull/2437">#2437</a>).</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="e1c60d4dd2"><code>e1c60d4</code></a>
26.3.6</li>
<li><a
href="04da43e08c"><code>04da43e</code></a>
fix: allow typescript 7 in optional peerDependencies range
(react-i18next#1927)</li>
<li><a
href="8eed4accc6"><code>8eed4ac</code></a>
build</li>
<li><a
href="573ae73568"><code>573ae73</code></a>
26.3.5</li>
<li><a
href="cc54b05b5c"><code>cc54b05</code></a>
docs(changelog): 26.3.5 — multiline $t() options, replace mutation,
escaped-l...</li>
<li><a
href="3180d67291"><code>3180d67</code></a>
fix: skip interpolation of placeholders inside escaped values (<a
href="https://redirect.github.com/i18next/i18next/issues/2442">#2442</a>)</li>
<li><a
href="d16f5a2da7"><code>d16f5a2</code></a>
fix: stop mutating the passed replace object when returning details (<a
href="https://redirect.github.com/i18next/i18next/issues/2441">#2441</a>)</li>
<li><a
href="bed56c1159"><code>bed56c1</code></a>
fix: parse $t() nesting options block that spans multiple lines (<a
href="https://redirect.github.com/i18next/i18next/issues/2440">#2440</a>)</li>
<li><a
href="c19e45864f"><code>c19e458</code></a>
docs(changelog): link GHSA advisory for deepExtend fix</li>
<li><a
href="7bb87d09f9"><code>7bb87d0</code></a>
docs(changelog): reference security advisory for deepExtend fix</li>
<li>Additional commits viewable in <a
href="https://github.com/i18next/i18next/compare/v26.3.1...v26.3.6">compare
view</a></li>
</ul>
</details>
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