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3.2 blog
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title: Docusaurus 3.2
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authors: [slorber]
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tags: [release]
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image: ./img/social-card.png
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date: 2024-03-29
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---
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We are happy to announce **Docusaurus 3.2**.
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The upgrade should be easy: as explained in our [release process documentation](/community/release-process), minor versions respect [Semantic Versioning](https://semver.org/).
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<!--truncate-->
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import BrowserWindow from '@site/src/components/BrowserWindow';
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import IframeWindow from '@site/src/components/BrowserWindow/IframeWindow';
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import ErrorBoundaryTestButton from '@site/src/components/ErrorBoundaryTestButton';
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## Highlights
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### Faster builds
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We worked hard to reduce the time it takes to build a Docusaurus site in production mode.
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Between v3.1.0 and v3.2.0, several changes have been made, leading to significantly faster production builds for many sites.
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Let's take an example. Our benchmark on the [React Native website upgrading to v3.2](https://github.com/facebook/react-native-website/pull/4072) reports the following results:
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- 🔥 Cold builds: 95s ➡️ 66s (~30% faster)
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- 🔥 Incremental builds: 55s ➡️ 22s (~60% faster)
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The results will vary depending on your site's topology and the options you turned on, but we expect the largest sites will see the most significant improvements.
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Note that this is only the beginning, and Docusaurus performance can still be significantly improved, notably the bundling time and the memory consumption. Track our [performance issue](https://github.com/facebook/docusaurus/issues/4765) for upcoming improvements.
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<details>
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<summary>What is the difference between a cold build and an incremental build?</summary>
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A cold build is when the Docusaurus caches are empty, generally after running `docusaurus clear`.
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An incremental build happens when you run another time the `docusaurus build` command. Docusaurus automatically tries to "re-use" computations from former builds to make subsequent builds faster. In practice it's based on [Webpack persistent caching](https://webpack.js.org/guides/build-performance/#persistent-cache). To enable incremental builds on your CI server, you can persist the `node_modules/.cache` folder across builds.
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</details>
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## Faster Dev Server
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We also worked on improving the performance of the dev server, so that you can get a faster feedback when editing Markdown/MDX files.
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The way we initially implemented content reloading wasn't great. For example, editing a blog post file would also trigger a useless reload of the unrelated docs plugin. From now on, when editing a plugin's content, only that plugin will reload. It's hard to measure precisely the impact of this change, but I estimate edits should appear in your browser at least 50% faster 🔥.
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We plan to keep improving the speed of our dev server, with even more granular hot reloads, ensuring we don't run useless computations that would always keep giving the same result.
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## Blog improvements
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We improved the blog plugin with several new options to make it even more powerful and flexible:
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- [#9912](https://github.com/facebook/docusaurus/pull/9912): you can now display the last update time and author of a blog post, a feature the docs plugin already had.
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- [#9886](https://github.com/facebook/docusaurus/pull/9886): a new `processBlogPosts` option allow you to filter/transform/sort blog posts.
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- [#9838](https://github.com/facebook/docusaurus/pull/9838): a new `pageBasePath` option allows you to customize the blog pagination URL segment (`/blog/page/2`)
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## Sitemap improvements
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With [#9954](https://github.com/facebook/docusaurus/pull/9954), the sitemap plugin has a new `lastmod` option that can now emit a `<lastmod>` tag on the XML. The value is read from the Git history by default, but can be overridden with docs and blog `last_update` front matter.
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We also made it possible to opt-out of emitting `<priority>` and `<frequency>` tags, which are generally ignored by crawlers (notably [Google](https://developers.google.com/search/blog/2023/06/sitemaps-lastmod-ping)).
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We recommend to use the following sitemap plugin config, that will become the default in Docusaurus V4:
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```js
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{
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lastmod: 'date',
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priority: null,
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changefreq: null,
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}
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```
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---
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PERF:
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- cold builds
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- incremental builds
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- sitemap lastmod: https://github.com/facebook/docusaurus/pull/9954
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- blog last update date/time: https://github.com/facebook/docusaurus/pull/9912
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- blog processBlogPosts: https://github.com/facebook/docusaurus/pull/9886
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- blog pageBasePath: https://github.com/facebook/docusaurus/pull/9838
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Other:
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- Vercel Analytics plugin: https://github.com/facebook/docusaurus/pull/9687
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- Icelandic translation: https://github.com/facebook/docusaurus/pull/9928
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- allContentLoaded plugin lifecycle: https://github.com/facebook/docusaurus/pull/9931
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- CLI prompt user for TS? https://github.com/facebook/docusaurus/pull/9681 + https://github.com/facebook/docusaurus/pull/9442
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---
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---
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---
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---
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---
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---
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---
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### Broken anchors checker
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In [#9528](https://github.com/facebook/docusaurus/pull/9528), we improved the built-in broken links checker to also detect broken anchors.
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:::tip[Make it fail fast]
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The new [`onBrokenAnchors`](/docs/api/docusaurus-config#onBrokenAnchors) option has value `warn` by default, for retro-compatibility reasons.
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We recommend to turn it to `throw` and fail your CI builds instead of deploying broken anchors to productions.
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:::
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:::note
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For users and plugin authors implementing custom `<Heading>` and `<Link>` components, we provide a new [`useBrokenLinks`](/docs/docusaurus-core#useBrokenLinks) React hook API.
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**Most Docusaurus users don't need to care about it**, built-in components (`docusaurus/Link` and `@theme/Heading`) already use it internally.
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:::
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### `parseFrontMatter` hook
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In [#9624](https://github.com/facebook/docusaurus/pull/9624), we added a new [`siteConfig.markdown.parseFrontMatter` function hook](/docs/api/docusaurus-config#markdown).
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This makes it possible to implement convenient front matter transformations, shortcuts, or to integrate with external systems using front matter that Docusaurus plugins do not support.
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```js title="docusaurus.config.js"
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export default {
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markdown: {
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// highlight-start
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parseFrontMatter: async (params) => {
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// Reuse the default parser
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const result = await params.defaultParseFrontMatter(params);
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// Process front matter description placeholders
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result.frontMatter.description =
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result.frontMatter.description?.replaceAll('{{MY_VAR}}', 'MY_VALUE');
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// Create your own front matter shortcut
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if (result.frontMatter.i_do_not_want_docs_pagination) {
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result.frontMatter.pagination_prev = null;
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result.frontMatter.pagination_next = null;
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}
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// Rename an unsupported front matter coming from another system
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if (result.frontMatter.cms_seo_summary) {
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result.frontMatter.description = result.frontMatter.cms_seo_summary;
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delete result.frontMatter.cms_seo_summary;
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}
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return result;
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},
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// highlight-end
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},
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};
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```
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Read the [front matter guide](/docs/markdown-features#front-matter) and the [`parseFrontMatter` API ref](/docs/api/docusaurus-config#markdown) for details.
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## Other changes
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Other notable changes include:
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- [#9674](https://github.com/facebook/docusaurus/pull/9674): add `siteConfig.markdown.remarkRehypeOptions` to pass options to `remark-rehype`, letting you customize things such as MDX footnote label
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- [#9671](https://github.com/facebook/docusaurus/pull/9671): add code block MagicComments support for (Visual) Basic/Batch/Fortran/COBOL/ML
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- [#9610](https://github.com/facebook/docusaurus/pull/9610): enable CLI port configuration via `PORT` environment variable
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- [#9477](https://github.com/facebook/docusaurus/pull/9477): complete Brazilian Portuguese (pt-BR) translations
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Check the **[3.1.0 changelog entry](/changelog/3.1.0)** for an exhaustive list of changes.
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