docs: Docusaurus v3.0 blog post

project-words.txt

@@ -200,6 +200,7 @@ metrika
 microdata
 microlink
 middlewares
+mindmap
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website/blog/releases/3.0/index.mdx

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+---
+title: Announcing Docusaurus 3.0
+authors:
+  - slorber
+tags: [release]
+image: ./img/social-card.png
+date: 2023-10-25
+unlisted: true
+---
+
+Today we are happy to **announce Docusaurus 3.0**! 🥳
+
+At [**Meta Open Source**](https://opensource.fb.com/), we believe Docusaurus will help you build the **best documentation websites** with **minimal effort**, letting you **focus on what really matters**: writing the content.
+
+This is a new **major version** of Docusaurus, coming with **new exciting features** and upgraded dependencies.
+
+We respect [**Semantic Versioning**](https://semver.org/) and this release also includes **breaking changes** that we documented thoroughly in the [**v3 upgrade guide**](/docs/3.0.0-rc.0/migration/v3). Breaking changes can be annoying, but are necessary to set the ground for a **new wave of Docusaurus features** that we plan to implement later.
+
+![v3.0 social-card image](./img/social-card.png)
+
+{/* truncate */}
+
+We initially planned to release more frequent major versions, but this one has taken longer than expected. **Upgrading to [MDX v2](https://mdxjs.com/blog/v2/) is the main challenge** to the adoption of this new version. We went the extra mile to make this upgrade as easy as possible, notably by adding [compatibility options for MDX v1](/docs/3.0.0-rc.0/api/docusaurus-config#markdown).
+
+The simplest sites will only need to upgrade a few npm dependencies. For more complex sites, we came up with a few strategies than can help you upgrade more confidently:
+
+- [Prepare your site](/blog/preparing-your-site-for-docusaurus-v3) ahead of time, incrementally, while staying on Docusaurus v2
+- [Set up visual regression tests](/blog/upgrading-frontend-dependencies-with-confidence-using-visual-regression-testing) to catch unexpected visual changes happening during the upgrade
+
+:::info About Docusaurus v2
+
+According to our [release process](/community/release-process#stable-version), Docusaurus v2 has now entered **maintenance mode**. It will only receive support for major security issues for 3 months, until 31 January 2024. It is recommended to upgrade within that time frame to v3.
+
+:::
+
+import IframeWindow from '@site/src/components/BrowserWindow/IframeWindow';
+
+## Breaking changes
+
+This section only gives you a quick glance. All the breaking changes are thoroughly documented on the [**v3 upgrade guide**](/docs/3.0.0-rc.0/migration/v3).
+
+Docusaurus v3 upgraded a few dependencies to new major versions, each coming with their own breaking changes:
+
+- Node.js v16 ➡️ v18
+- React v17 ➡️ v18
+- MDX v1 ➡️ v2
+- TypeScript v4 ➡️ v5
+- prism-react-renderer v1 ➡️ v2
+- react-live v2 ➡️ v4
+- Mermaid v9 ➡️ v10
+- import-fresh v3 ➡️ jiti v1
+
+A typical `package.json` dependency upgrade looks like:
+
+```diff title="package.json"
+ {
+   "dependencies": {
+     // upgrade to Docusaurus v3
+-    "@docusaurus/core": "2.4.3",
+-    "@docusaurus/preset-classic": "2.4.3",
++    "@docusaurus/core": "3.0.0",
++    "@docusaurus/preset-classic": "3.0.0",
+     // upgrade to MDX v2
+-    "@mdx-js/react": "^1.6.22",
++    "@mdx-js/react": "^2.3.0",
+     // upgrade to prism-react-renderer v2.0+
+-    "prism-react-renderer": "^1.3.5",
++    "prism-react-renderer": "^2.1.0",
+     // upgrade to React v18.0+
+-    "react": "^17.0.2",
+-    "react-dom": "^17.0.2"
++    "react": "^18.2.0",
++    "react-dom": "^18.2.0"
+   },
+   "devDependencies": {
+     // upgrade Docusaurus dev dependencies to v3
+-    "@docusaurus/module-type-aliases": "2.4.3"
+-    "@docusaurus/types": "2.4.3"
++    "@docusaurus/module-type-aliases": "3.0.0"
++    "@docusaurus/types": "3.0.0"
+   }
+   "engines": {
+     // require Node.js 18.0+
+-    "node": ">=16.14"
++    "node": ">=18.0"
+   }
+ }
+```
+
+Apart from MDX v2, most breaking changes coming with those upgraded dependencies have been handled internally for you: most of the time, you shouldn't have to do anything. Outside of dependencies, the only functional breaking changes coming explicitly from the Docusaurus codebase are:
+
+- [#9189](https://github.com/facebook/docusaurus/pull/9189): new default blog RSS feed limit of 20 entries
+- [#9308](https://github.com/facebook/docusaurus/pull/9308): fix and re-introduce the `:::warning` admonition, deprecate `:::caution`
+- [#9310](https://github.com/facebook/docusaurus/pull/9310): remove the legacy versioned sidebar id prefix, used for sites versioned before `v2.0.0-beta.10` (December 2021)
+- [#7966](https://github.com/facebook/docusaurus/pull/7966): refactor docs theme components, eventually requiring to you re-swizzle them
+
+## Highlights
+
+A non-exhaustive list of new useful features coming with this new version. All the features are listed in the [**Docusaurus v3.0.0 release notes**](https://github.com/facebook/docusaurus/releases/tag/v3.0.0).
+
+### Markdown
+
+In [#8288](https://github.com/facebook/docusaurus/pull/8288), we upgraded to [**MDX v2**](https://mdxjs.com/blog/v2/). This new version is **much better for content writers and plugin authors**, and lays the ground for implementing new exciting Markdown features.
+
+:::warning MDX v2 - the main challenge
+
+The [**upgrade to MDX v2**](https://mdxjs.com/blog/v2/) is the main upgrade challenge. Some documents that compiled successfully under Docusaurus v2 might now **fail to compile** under Docusaurus v3, while others might **render differently**.
+
+**Don't be intimidated**. Most problems are **easy to fix** and often related to `{` and `<` characters that you now need to escape. However, depending on the size of your site, you might need to edit many files and feel overwhelmed. For this reason, we provide a command [`npx docusaurus-mdx-checker`](https://github.com/slorber/docusaurus-mdx-checker) to help you get an estimate of the work to be done, and we recommend to [prepare your site in advance](/blog/preparing-your-site-for-docusaurus-v3).
+
+If you created custom [MDX plugins](/docs/markdown-features/plugins) (Remark/Rehype), the AST is slightly different, and you might need to refactor them.
+
+:::
+
+This notably enables us to add a [CommonMark mode](/docs/3.0.0-rc.0/markdown-features#mdx-vs-commonmark) that should make it easier for existing documentations to adopt Docusaurus. It is currently opt-in and **experimental** and limited ([some Docusaurus features will not work](https://github.com/facebook/docusaurus/issues/9092)). In Docusaurus v3, all files are still interpreted as MDX, but we plan to interpret `.md` files as CommonMark in an upcoming major version, and recommend to use the `.mdx` extension for any file using JSX or ES modules.
+
+We also introduced a new way to [configure Markdown globally for your site](/docs/3.0.0-rc.0/api/docusaurus-config#markdown), and plan to add more flexible options later.
+
+```js title="docusaurus.config.js"
+export default {
+  markdown: {
+    format: 'mdx',
+    mermaid: true,
+    preprocessor: ({filePath, fileContent}) => {
+      return fileContent.replaceAll('{{MY_VAR}}', 'MY_VALUE');
+    },
+    mdx1Compat: {
+      comments: true,
+      admonitions: true,
+      headingIds: true,
+    },
+  },
+};
+```
+
+Docusaurus now uses the [remark-directive](https://github.com/remarkjs/remark-directive) plugin to support admonitions. This also offers you the ability to create your own Remark plugins to extend Markdown with your own [custom directives](https://talk.commonmark.org/t/generic-directives-plugins-syntax/444) such as `:textDirective`, `::leafDirective` or `:::containerDirective`.
+
+### ESM and TypeScript configs {#esm-ts-configs}
+
+In [#9317](https://github.com/facebook/docusaurus/pull/9317), we added support for ES Modules and TypeScript config files, including site config, docs sidebars, plugins and presets.
+
+Here are 2 TypeScript examples, giving you a modern experience with IDE autocompletion:
+
+```ts title="docusaurus.config.ts"
+import type {Config} from '@docusaurus/types';
+import type * as Preset from '@docusaurus/preset-classic';
+
+const config: Config = {
+  title: 'My Site',
+  favicon: 'img/favicon.ico',
+  // your site config ...
+  presets: [
+    [
+      'classic',
+      {
+        // your preset config ...
+      } satisfies Preset.Options,
+    ],
+  ],
+  themeConfig: {
+    // your theme config ...
+  } satisfies Preset.ThemeConfig,
+};
+
+export default config;
+```
+
+```ts title="sidebars.ts"
+import type {SidebarsConfig} from '@docusaurus/plugin-content-docs';
+
+const sidebars: SidebarsConfig = {
+  docs: ['introduction'],
+};
+
+export default sidebars;
+```
+
+### Unlisted content
+
+Docusaurus already supported a `draft: true` front matter option in our 3 content plugins (docs, blog, pages), which allows you to remove some pages from your production builds.
+
+In [#8004](https://github.com/facebook/docusaurus/pull/8004), we introduced a new `unlisted: true` front matter option, which will keep your pages available in production builds, while "hiding" them and making them impossible to discover unless you have the url. This enables convenient workflows where you can easily ask for feedback on a piece of content before the final publication.
+
+Unlisted content will:
+
+- be excluded from `sitemap.xml`
+- be excluded from SEO results thanks to `<meta name="robots" content="noindex, nofollow" />`
+- be excluded from blog RSS feeds
+- be excluded from Algolia DocSearch results
+- be filtered from site navbar items, docs sidebars, blog sidebar, blog archives, tags pages...
+
+Unlisted content will also display a banner so that you don't forget to turn it off once your content is ready for prime time. Here's an example of an [unlisted blog post](/tests/blog/unlisted-post):
+
+<IframeWindow url="/tests/blog/unlisted-post" />
+
+### React 18
+
+In [#8961](https://github.com/facebook/docusaurus/pull/8961), we upgraded to React 18. This is important, notably for the [gradual adoption of Concurrent React features](https://react.dev/blog/2022/03/29/react-v18#gradually-adopting-concurrent-features), as well as upcoming exciting features such as [build-time React Server Components](https://github.com/facebook/docusaurus/issues/9089).
+
+This new version of React should be a drop-in replacement for most Docusaurus sites. It comes with breaking changes that we handled internally in the Docusaurus codebase. If your site is using a lot of custom React code, we recommend you to take a look at the official article on [How to Upgrade to React 18](https://react.dev/blog/2022/03/08/react-18-upgrade-guide), notably the new [automatic batching](https://react.dev/blog/2022/03/08/react-18-upgrade-guide#automatic-batching) behavior.
+
+:::danger Experimental support for React 18 features
+
+React 18 comes with new features:
+
+- `<Suspense>`
+- `React.lazy()`
+- `startTransition()`
+
+Their Docusaurus support is considered as **experimental**. We might have to adjust the integration in the future, leading to a different runtime behavior.
+
+:::
+
+### Automatic JSX runtime
+
+Docusaurus now uses the ["automatic" JSX runtime](https://legacy.reactjs.org/blog/2020/09/22/introducing-the-new-jsx-transform.html).
+
+It is not needed anymore to import React in JSX files that do not use any React API.
+
+```diff title="src/components/MyComponent.js"
+- import React from 'react';
+
+  export default function MyComponent() {
+    return <div>Hello</div>;
+  }
+```
+
+### Debug builds
+
+It is now possible to build your static site in dev mode.
+
+```bash
+docusaurus build --dev
+```
+
+:::tip Debug React-related problems
+
+Docusaurus will log more errors to the console, notably React 18 hydration errors through the new [`onRecoverableError` callback](https://react.dev/reference/react-dom/client/hydrateRoot#parameters).
+
+This new build mode is particularly helpful for **troubleshooting React problems**. Docusaurus will use the development build of React, thus producing detailed and readable error messages instead of minified ones linking to the [React Error Decoder page](https://reactjs.org/docs/error-decoder.html/).
+
+:::
+
+### TypeScript
+
+Docusaurus v3 now requires a minimum version of TypeScript 5.0.
+
+We re-internalized the base recommended TypeScript config to a new official package:
+
+```diff title="tsconfig.json"
+ {
+-  "extends": "@tsconfig/docusaurus/tsconfig.json",
++  "extends": "@docusaurus/tsconfig",
+   "compilerOptions": {
+     "baseUrl": "."
+   }
+ }
+```
+
+We also have cleaner, normalized exports for Docusaurus core type, plugin, and preset options, which you can use within the brand-new [TypeScript config files](#esm-ts-configs):
+
+```ts title="docusaurus.config.ts"
+import type {Config} from '@docusaurus/types';
+import type {Options, ThemeConfig} from '@docusaurus/preset-classic';
+import type {SidebarsConfig} from '@docusaurus/plugin-content-docs';
+```
+
+### Code blocks
+
+In [#9316](https://github.com/facebook/docusaurus/pull/9316), we improved on syntax highlighting thanks to the [prism-react-renderer](https://github.com/FormidableLabs/prism-react-renderer) v2 upgrade. For example, a bash param `--save` is now colored:
+
+```bash
+npm install --save some-package
+```
+
+The [interactive code editor](/docs/3.0.0-rc.0/markdown-features/code-blocks#interactive-code-editor) also upgrades to [react-live](https://github.com/FormidableLabs/react-live) v4, coming with a new [sucrase](https://github.com/alangpierce/sucrase) compiler. It is faster, lighter, and supports modern features, notably TypeScript type annotations.
+
+```js live
+function Hello() {
+  const name: string = 'World';
+  return <div>Hello {name}</div>;
+}
+```
+
+In [#8982](https://github.com/facebook/docusaurus/pull/8982) and [#8870](https://github.com/facebook/docusaurus/pull/8870), we also added [magic comments](docs/3.0.0-rc.0/markdown-features/code-blocks#custom-magic-comments) support for TeX-like, Haskell-like, and WebAssembly comment syntax.
+
+```haskell title="haskell.hs"
+stringLength :: String -> Int
+-- highlight-next-line
+stringLength [] = 0
+stringLength (x:xs) = 1 + stringLength xs
+```
+
+```matlab title="matlab.m"
+% highlight-start
+function result = times2(n)
+  result = n * 2;
+end
+% highlight-end
+x = 10;
+% highlight-next-line
+y = times2(x);
+```
+
+### Mermaid diagrams
+
+In [#9305](https://github.com/facebook/docusaurus/pull/9305), we upgraded to Mermaid v10.4 and added support for async diagram rendering. Docusaurus is now able to render new types of diagrams.
+
+<details>
+  <summary>Mindmap</summary>
+
+```mermaid
+mindmap
+  root((mindmap))
+    Research
+      Creative techniques
+      Strategic planning
+      Argument mapping
+    Tools
+      Pen and paper
+      Mermaid
+```
+
+</details>
+
+<details>
+  <summary>Quadrant chart</summary>
+
+```mermaid
+quadrantChart
+  title Reach and engagement of campaigns
+  x-axis Low Reach --> High Reach
+  y-axis Low Engagement --> High Engagement
+  quadrant-1 We should expand
+  quadrant-2 Need to promote
+  quadrant-3 Re-evaluate
+  quadrant-4 May be improved
+  Campaign A: [0.3, 0.6]
+  Campaign B: [0.45, 0.23]
+  Campaign C: [0.57, 0.69]
+  Campaign D: [0.78, 0.34]
+  Campaign E: [0.40, 0.34]
+  Campaign F: [0.35, 0.78]
+```
+
+</details>
+
+### Query-string data attributes
+
+In [#9028](https://github.com/facebook/docusaurus/pull/9028), we made it possible to set custom HTML [data attributes](https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/data-*) though `docusaurus-data-x` query-string parameters. This makes it easier to embed a Docusaurus iframe on another site, and lets you customize the appearance of the embedded version with CSS.
+
+```css title="/src/css/custom.css"
+html[data-navbar='false'] .navbar {
+  display: none;
+}
+
+html[data-red-border] div#__docusaurus {
+  border: red solid thick;
+}
+```
+
+<IframeWindow url="/docs/?docusaurus-data-navbar=false&docusaurus-data-red-border" />
+
+### Other features
+
+Other new features worth mentioning:
+
+- [#9189](https://github.com/facebook/docusaurus/pull/9189): new blog `feedOptions.limit` option
+- [#9071](https://github.com/facebook/docusaurus/pull/9071): add normalized SEO front matter support for the pages plugin
+- [#9171](https://github.com/facebook/docusaurus/pull/9028): the client-redirects plugin now supports fully qualified urls and query-string/hash in destination url
+- [#9171](https://github.com/facebook/docusaurus/pull/9171): new ESLint rule [`no-html-links`](/docs/3.0.0-rc.0/api/misc/@docusaurus/eslint-plugin/no-html-links)
+- [#8384](https://github.com/facebook/docusaurus/pull/8384): new ESLint rule [`prefer-docusaurus-heading`](/docs/3.0.0-rc.0/api/misc/@docusaurus/eslint-plugin/prefer-docusaurus-heading)
+
+Read [**Docusaurus v3.0.0 release notes**](https://github.com/facebook/docusaurus/releases/tag/v3.0.0) for an exhaustive list of changes.
+
+## Conclusion
+
+This release comes with a few features, but more importantly **upgrades many pieces of the Docusaurus infrastructure**.
+
+The adoption of **MDX v2** consumed a lot of our time this year, and we worked hard to make this important upgrade less difficult for all of you.
+
+Now that we've caught up with our infrastructure, we'll be back **delivering useful documentation features** very soon, in upcoming minor versions.
+
+We would like to thank you for using Docusaurus over the years. The documentation framework space is becoming more competitive lately, and we will do our best to ensure that Docusaurus remains a **competitive solution** that stands out for its great **flexibility**.