Bumps [prettier](https://github.com/prettier/prettier) from 3.8.4 to 3.9.1. <details> <summary>Release notes</summary> <p><em>Sourced from <a href="https://github.com/prettier/prettier/releases">prettier's releases</a>.</em></p> <blockquote> <h2>3.9.1</h2> <ul> <li>CLI: Fix ignored file has been cached incorrectly (<a href="https://redirect.github.com/prettier/prettier/pull/19483">#19483</a> by <a href="https://github.com/kovsu"><code>@kovsu</code></a>)</li> </ul> <p>🔗 <a href="https://github.com/prettier/prettier/blob/3.9.1/CHANGELOG.md#391">Changelog</a></p> <h2>3.9.0</h2> <p><a href="https://github.com/prettier/prettier/compare/3.8.5...3.9.0">diff</a></p> <p>🔗 <a href="https://prettier.io/blog/2026/06/27/3.9.0">Prettier 3.9: Major parser upgrades and Formatting improvements</a></p> <h2>3.8.5</h2> <ul> <li>Fix Flow variance annotation print (<a href="https://redirect.github.com/prettier/prettier/pull/19022">#19022</a> by <a href="https://github.com/marcoww6"><code>@marcoww6</code></a>)</li> </ul> <p>🔗 <a href="https://github.com/prettier/prettier/blob/3.8.5/CHANGELOG.md#385">Changelog</a></p> </blockquote> </details> <details> <summary>Changelog</summary> <p><em>Sourced from <a href="https://github.com/prettier/prettier/blob/main/CHANGELOG.md">prettier's changelog</a>.</em></p> <blockquote> <h1>3.9.1</h1> <p><a href="https://github.com/prettier/prettier/compare/3.9.0...3.9.1">diff</a></p> <h4>CLI: Fix ignored file has been cached incorrectly (<a href="https://redirect.github.com/prettier/prettier/pull/19483">#19483</a> by <a href="https://github.com/kovsu"><code>@kovsu</code></a>)</h4> <p>Bug details <a href="https://redirect.github.com/prettier/prettier/issues/18016">prettier/prettier#18016</a></p> <h1>3.9.0</h1> <p><a href="https://github.com/prettier/prettier/compare/3.8.5...3.9.0">diff</a></p> <p>🔗 <a href="https://prettier.io/blog/2026/06/27/3.9.0">Release Notes</a></p> <h1>3.8.5</h1> <p><a href="https://github.com/prettier/prettier/compare/3.8.4...3.8.5">diff</a></p> <h4>Flow: Support <code>readonly</code> as a variance annotation (<a href="https://redirect.github.com/prettier/prettier/pull/19022">#19022</a> by <a href="https://github.com/marcoww6"><code>@marcoww6</code></a>)</h4> <p>Flow now accepts <code>readonly</code> as a property variance annotation, equivalent to <code>+</code> (covariant/read-only).</p> <pre lang="jsx"><code>// Input type T = { readonly foo: string, }; <p>// Prettier 3.8.4<br /> SyntaxError</p> <p>// Prettier 3.8.5<br /> type T = {<br /> readonly foo: string,<br /> };<br /> </code></pre></p> </blockquote> </details> <details> <summary>Commits</summary> <ul> <li><a href="https://github.com/prettier/prettier/commit/c47654c003fe525572e10d5cc1ea64d7b9c0ee55"><code>c47654c</code></a> Release 3.9.1</li> <li><a href="https://github.com/prettier/prettier/commit/06159aa254e662514d1c6f4de13fbac805984232"><code>06159aa</code></a> Fix bug in release script</li> <li><a href="https://github.com/prettier/prettier/commit/4bc5ab40582921f5283af4ff5d6511b58d25ec00"><code>4bc5ab4</code></a> Update file-entry-cache to 11.1.5 (<a href="https://redirect.github.com/prettier/prettier/issues/19483">#19483</a>)</li> <li><a href="https://github.com/prettier/prettier/commit/b7fd58bba027282038ad312af0522d4598e8b769"><code>b7fd58b</code></a> Release <code>@prettier/plugin-oxc@0.2.0</code> and <code>@prettier/plugin-hermes@0.2.0</code></li> <li><a href="https://github.com/prettier/prettier/commit/3006400fc2560e297b54d82c58cbc331ec87902c"><code>3006400</code></a> Revert changes in release script</li> <li><a href="https://github.com/prettier/prettier/commit/7bef7dba7e99423e8f781228e8a73163f26ca9e9"><code>7bef7db</code></a> Git blame ignore 3.9.0</li> <li><a href="https://github.com/prettier/prettier/commit/bb817b1bd04c04e0a8d89cb52c256a38e17fd0f5"><code>bb817b1</code></a> Bump Prettier dependency to 3.9.0</li> <li><a href="https://github.com/prettier/prettier/commit/05cf896cfcc0890f58790c380f3da1d98872d071"><code>05cf896</code></a> Clean changelog_unreleased</li> <li><a href="https://github.com/prettier/prettier/commit/79f6cdfd9873a91be9b25c9c6a41d26dcd9a6656"><code>79f6cdf</code></a> Disable finished steps</li> <li><a href="https://github.com/prettier/prettier/commit/3613b1e5a309f5b4a74acf9436946a77e4dddf69"><code>3613b1e</code></a> Add blog post for v3.9 (<a href="https://redirect.github.com/prettier/prettier/issues/19414">#19414</a>)</li> <li>Additional commits viewable in <a href="https://github.com/prettier/prettier/compare/3.8.4...3.9.1">compare view</a></li> </ul> </details> <br /> [![Dependabot compatibility score](https://dependabot-badges.githubapp.com/badges/compatibility_score?dependency-name=prettier&package-manager=npm_and_yarn&previous-version=3.8.4&new-version=3.9.1)](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores) Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting `@dependabot rebase`. [//]: # (dependabot-automerge-start) [//]: # (dependabot-automerge-end) --- <details> <summary>Dependabot commands and options</summary> <br /> 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 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) </details>