- [#5654](https://github.com/withastro/astro/pull/5654) [`2c65b433b`](https://github.com/withastro/astro/commit/2c65b433bf840a1bb93b0a1947df5949e33512ff) Thanks [@delucis](https://github.com/delucis)! - Run heading ID injection after user plugins
⚠️ BREAKING CHANGE ⚠️
If you are using a rehype plugin that depends on heading IDs injected by Astro, the IDs will no longer be available when your plugin runs by default.
To inject IDs before your plugins run, import and add the `rehypeHeadingIds` plugin to your `rehypePlugins` config:
```diff
// astro.config.mjs
+ import { rehypeHeadingIds } from '@astrojs/markdown-remark';
- [#5522](https://github.com/withastro/astro/pull/5522) [`efc4363e0`](https://github.com/withastro/astro/commit/efc4363e0baf7f92900e20af339811bb3df42b0e) Thanks [@delucis](https://github.com/delucis)! - Support use of `<Fragment>` in MDX files rendered with `<Content />` component
- [#5335](https://github.com/withastro/astro/pull/5335) [`dca762cf7`](https://github.com/withastro/astro/commit/dca762cf734a657d8f126fd6958892b6163a4f67) Thanks [@bluwy](https://github.com/bluwy)! - Preserve code element node `data.meta` in `properties.metastring` for rehype syntax highlighters, like `rehype-pretty-code``
- [#4588](https://github.com/withastro/astro/pull/4588) [`db38f61b2`](https://github.com/withastro/astro/commit/db38f61b2b2dc55f03b28797d19b163b1940f1c8) Thanks [@bholmesdev](https://github.com/bholmesdev)! - Fix: Add GFM and Smartypants to MDX by default
- [#4504](https://github.com/withastro/astro/pull/4504) [`8f8dff4d3`](https://github.com/withastro/astro/commit/8f8dff4d339a3a12ee155d81a97132032ef3b622) Thanks [@bholmesdev](https://github.com/bholmesdev)! - Introduce new `extendPlugins` configuration option. This defaults to inheriting all remark and rehype plugins from your `markdown` config, with options to use either Astro's defaults or no inheritance at all.
- [#4423](https://github.com/withastro/astro/pull/4423) [`d4cd7a59f`](https://github.com/withastro/astro/commit/d4cd7a59fd38d411c442a818cfaab40f74106628) Thanks [@bholmesdev](https://github.com/bholmesdev)! - Update Markdown type signature to match new markdown plugin,and update top-level layout props for better alignment
- [#4423](https://github.com/withastro/astro/pull/4423) [`d4cd7a59f`](https://github.com/withastro/astro/commit/d4cd7a59fd38d411c442a818cfaab40f74106628) Thanks [@bholmesdev](https://github.com/bholmesdev)! - Update Markdown type signature to match new markdown plugin,and update top-level layout props for better alignment
- [#4443](https://github.com/withastro/astro/pull/4443) [`adb207979`](https://github.com/withastro/astro/commit/adb20797962c280d4d38f335f577fd52a1b48d4b) Thanks [@bholmesdev](https://github.com/bholmesdev)! - Fix MDX style imports when layout is not applied
* [#4428](https://github.com/withastro/astro/pull/4428) [`a2414bf59`](https://github.com/withastro/astro/commit/a2414bf59e2e2cd633aece68e724401c4ad281b9) Thanks [@bholmesdev](https://github.com/bholmesdev)! - Fix dev server reload performance when globbing from an MDX layout
- [#4248](https://github.com/withastro/astro/pull/4248) [`869d00935`](https://github.com/withastro/astro/commit/869d0093596b709cfcc1a1a95ee631b48d6d1c26) Thanks [@svemat01](https://github.com/svemat01)! - Load builtin rehype plugins before user plugins instead of after
* [#4255](https://github.com/withastro/astro/pull/4255) [`411612808`](https://github.com/withastro/astro/commit/4116128082121ee276d51cb245bf8095be4728a1) Thanks [@bholmesdev](https://github.com/bholmesdev)! - Pass injected frontmatter from remark and rehype plugins to layouts
- [#4176](https://github.com/withastro/astro/pull/4176) [`2675b8633`](https://github.com/withastro/astro/commit/2675b8633c5d5c45b237ec87940d5eaf1bfb1b4b) Thanks [@bholmesdev](https://github.com/bholmesdev)! - Support frontmatter injection for MD and MDX using remark and rehype plugins
* [#4174](https://github.com/withastro/astro/pull/4174) [`8eb3a8c6d`](https://github.com/withastro/astro/commit/8eb3a8c6d9554707963c3a3bc36ed8b68d3cf0fb) Thanks [@matthewp](https://github.com/matthewp)! - Allows using React with automatic imports alongside MDX
- [#4145](https://github.com/withastro/astro/pull/4145) [`c7efcf57e`](https://github.com/withastro/astro/commit/c7efcf57e00a0fcde3bc9f813e3cc59902bd484c) Thanks [@FredKSchott](https://github.com/FredKSchott)! - Fix a missing newline bug when `layout` was set.
- [#4095](https://github.com/withastro/astro/pull/4095) [`40ef43a59`](https://github.com/withastro/astro/commit/40ef43a59b08a1a8fbcd9f4a53745a9636a4fbb9) Thanks [@bholmesdev](https://github.com/bholmesdev)! - Add IDs to MDX headings and expose via getHeadings() export
* [#4114](https://github.com/withastro/astro/pull/4114) [`64432bcb8`](https://github.com/withastro/astro/commit/64432bcb873efd0e4297c00fc9583a1fe516dfe7) Thanks [@Princesseuh](https://github.com/Princesseuh)! - Refactor `@astrojs/mdx` and `@astrojs/markdown-remark` to use `@astrojs/prism` instead of duplicating the code
### Patch Changes
- [#4112](https://github.com/withastro/astro/pull/4112) [`e33fc9bc4`](https://github.com/withastro/astro/commit/e33fc9bc46ff0a30013deb6dc76e545e70cc3a3e) Thanks [@matthewp](https://github.com/matthewp)! - Fix MDX working with a ts config file
- [#4076](https://github.com/withastro/astro/pull/4076) [`6120a71e5`](https://github.com/withastro/astro/commit/6120a71e5425ad55a17ddac800d64a3f50273bce) Thanks [@matthewp](https://github.com/matthewp)! - Ensure file and url are always present in MDX for Astro.glob
- [#3977](https://github.com/withastro/astro/pull/3977) [`19433eb4a`](https://github.com/withastro/astro/commit/19433eb4a4441522f68492ca914ad2ab4f061343) Thanks [@bholmesdev](https://github.com/bholmesdev)! - Add remarkPlugins and rehypePlugins to config, with the same default plugins as our standard Markdown parser
* [#4002](https://github.com/withastro/astro/pull/4002) [`3b8a74452`](https://github.com/withastro/astro/commit/3b8a7445247221100462ba035f6778b43ea180e7) Thanks [@bholmesdev](https://github.com/bholmesdev)! - Support Prism and Shiki syntax highlighting based on project config
- [#3995](https://github.com/withastro/astro/pull/3995) [`b2b367c96`](https://github.com/withastro/astro/commit/b2b367c969493aaf21c974064beb241d05228066) Thanks [@bholmesdev](https://github.com/bholmesdev)! - Support YAML frontmatter in MDX files
### Patch Changes
- [#4050](https://github.com/withastro/astro/pull/4050) [`9ab66c4ba`](https://github.com/withastro/astro/commit/9ab66c4ba9bf2250990114c76b792f26d0694365) Thanks [@FredKSchott](https://github.com/FredKSchott)! - Add support for injected "page-ssr" scripts
* [#3981](https://github.com/withastro/astro/pull/3981) [`61fec6304`](https://github.com/withastro/astro/commit/61fec63044e1585348e8405bee6fdf4dec635efa) Thanks [@bholmesdev](https://github.com/bholmesdev)! - Include page url in MDX glob result
- [#3854](https://github.com/withastro/astro/pull/3854) [`b012ee55`](https://github.com/withastro/astro/commit/b012ee55b107dea0730286263b27d83e530fad5d) Thanks [@bholmesdev](https://github.com/bholmesdev)! - [astro add] Support adapters and third party packages