Markdown and MDX configuration rework

.changeset/shaggy-keys-turn.md

@@ -0,0 +1,63 @@
+---
+'astro': major
+'@astrojs/markdown-remark': major
+'@astrojs/mdx': minor
+---
+
+Refine Markdown and MDX configuration options for ease-of-use.
+
+#### Markdown
+
+- **Remove `remark-smartypants`** from Astro's default Markdown plugins.
+- **Replace the `extendDefaultPlugins` option** with a simplified `gfm` boolean. This is enabled by default, and can be disabled to remove GitHub-Flavored Markdown.
+- Ensure GitHub-Flavored Markdown is applied whether or not custom `remarkPlugins` or `rehypePlugins` are configured. If you want to apply custom plugins _and_ remove GFM, manually set `gfm: false` in your config.
+
+#### MDX
+
+- Support _all_ Markdown configuration options (except `drafts`) from your MDX integration config. This includes `syntaxHighlighting` and `shikiConfig` options to further customize the MDX renderer.
+- Simplify `extendDefaults` to an `extendMarkdownConfig` option. MDX options will default to their equivalent in your Markdown config. By setting `extendMarkdownConfig` to false, you can "eject" to set your own syntax highlighting, plugins, and more.
+
+#### Migration
+
+To preserve your existing Markdown and MDX setup, you may need some configuration changes:
+
+##### Smartypants manual installation
+
+[Smartypants](https://github.com/silvenon/remark-smartypants) has been removed from Astro's default setup. If you rely on this plugin, [install `remark-smartypants`](https://github.com/silvenon/remark-smartypants#installing) and apply to your `astro.config.*`:
+
+```diff
+// astro.config.mjs
+import { defineConfig } from 'astro/config';
++ import smartypants from 'remark-smartypants';
+
+export default defineConfig({
+  markdown: {
++   remarkPlugins: [smartypants],
+  }
+});
+```
+
+##### Migrate `extendDefaultPlugins` to `gfm`
+
+You may have disabled Astro's built-in plugins (GitHub-Flavored Markdown and Smartypants) with the `extendDefaultPlugins` option. Since Smartypants has been removed, this has been renamed to `gfm`.
+
+```diff
+// astro.config.mjs
+import { defineConfig } from 'astro/config';
+
+export default defineConfig({
+  markdown: {
+-   extendDefaultPlugins: false,
++   gfm: false,
+  }
+});
+```
+
+
+Additionally, applying remark and rehype plugins **no longer disables** `gfm`. You will need to opt-out manually by setting `gfm` to `false`.
+
+##### Migrate MDX's `extendPlugins` to `extendMarkdownConfig`
+
+You may have used the `extendPlugins` option to manage plugin defaults in MDX. This has been replaced by 2 flags:
+- `extendMarkdownConfig` (`true` by default) to toggle Markdown config inheritance. This replaces the `extendPlugins: 'markdown'` option.
+- `gfm` (`true` by default) to toggle GitHub-Flavored Markdown in MDX. This replaces the `extendPlugins: 'defaults'` option.

packages/astro/src/@types/astro.ts

@@ -734,10 +734,6 @@ export interface AstroUserConfig {
 		 * @description
 		 * Pass [remark plugins](https://github.com/remarkjs/remark) to customize how your Markdown is built. You can import and apply the plugin function (recommended), or pass the plugin name as a string.
 		 *
-		 * :::caution
-		 * Providing a list of plugins will **remove** our default plugins. To preserve these defaults, see the [`extendDefaultPlugins`](#markdownextenddefaultplugins) flag.
-		 * :::
-		 *
 		 * ```js
 		 * import remarkToc from 'remark-toc';
 		 * {
@@ -755,10 +751,6 @@ export interface AstroUserConfig {
 		 * @description
 		 * Pass [rehype plugins](https://github.com/remarkjs/remark-rehype) to customize how your Markdown's output HTML is processed. You can import and apply the plugin function (recommended), or pass the plugin name as a string.
 		 *
-		 * :::caution
-		 * Providing a list of plugins will **remove** our default plugins. To preserve these defaults, see the [`extendDefaultPlugins`](#markdownextenddefaultplugins) flag.
-		 * :::
-		 *
 		 * ```js
 		 * import rehypeMinifyHtml from 'rehype-minify';
 		 * {
@@ -771,23 +763,21 @@ export interface AstroUserConfig {
 		rehypePlugins?: RehypePlugins;
 		/**
 		 * @docs
-		 * @name markdown.extendDefaultPlugins
+		 * @name markdown.gfm
 		 * @type {boolean}
-		 * @default `false`
+		 * @default `true`
 		 * @description
-		 * Astro applies the [GitHub-flavored Markdown](https://github.com/remarkjs/remark-gfm) and [Smartypants](https://github.com/silvenon/remark-smartypants) plugins by default. When adding your own remark or rehype plugins, you can preserve these defaults by setting the `extendDefaultPlugins` flag to `true`:
+		 * Astro uses [GitHub-flavored Markdown](https://github.com/remarkjs/remark-gfm) by default. To disable this, set the `gfm` flag to `false`:
 		 *
 		 * ```js
 		 * {
 		 *   markdown: {
-		 *     extendDefaultPlugins: true,
-		 * 		 remarkPlugins: [exampleRemarkPlugin],
-		 *     rehypePlugins: [exampleRehypePlugin],
+		 *     gfm: false,
 		 *   }
 		 * }
 		 * ```
 		 */
-		extendDefaultPlugins?: boolean;
+		gfm?: boolean;
 		/**
 		 * @docs
 		 * @name markdown.remarkRehype

packages/astro/src/core/config/schema.ts

@@ -1,4 +1,5 @@
 import type { RehypePlugin, RemarkPlugin, RemarkRehype } from '@astrojs/markdown-remark';
+import { markdownConfigDefaults } from '@astrojs/markdown-remark';
 import type * as Postcss from 'postcss';
 import type { ILanguageRegistration, IThemeRegistration, Theme } from 'shiki';
 import type { AstroUserConfig, ViteUserConfig } from '../../@types/astro';
@@ -33,15 +34,7 @@ const ASTRO_CONFIG_DEFAULTS: AstroUserConfig & any = {
 	integrations: [],
 	markdown: {
 		drafts: false,
-		syntaxHighlight: 'shiki',
-		shikiConfig: {
-			langs: [],
-			theme: 'github-dark',
-			wrap: false,
-		},
-		remarkPlugins: [],
-		rehypePlugins: [],
-		remarkRehype: {},
+		...markdownConfigDefaults,
 	},
 	vite: {},
 	legacy: {
@@ -184,7 +177,7 @@ export const AstroConfigSchema = z.object({
 				.custom<RemarkRehype>((data) => data instanceof Object && !Array.isArray(data))
 				.optional()
 				.default(ASTRO_CONFIG_DEFAULTS.markdown.remarkRehype),
-			extendDefaultPlugins: z.boolean().default(false),
+			gfm: z.boolean().default(ASTRO_CONFIG_DEFAULTS.markdown.gfm),
 		})
 		.default({}),
 	vite: z

packages/astro/test/astro-markdown-plugins.test.js

@@ -46,29 +46,51 @@ describe('Astro Markdown plugins', () => {
 		expect($('#hello-world').hasClass('title')).to.equal(true);
 	});
 
-	for (const extendDefaultPlugins of [true, false]) {
-		it(`Handles default plugins when extendDefaultPlugins = ${extendDefaultPlugins}`, async () => {
+	// Asserts Astro 1.0 behavior is removed. Test can be removed in Astro 3.0.
+	it('Still applies GFM when user plugins are provided', async () => {
+		const fixture = await buildFixture({
+			markdown: {
+				remarkPlugins: [remarkExamplePlugin],
+				rehypePlugins: [[addClasses, { 'h1,h2,h3': 'title' }]],
+			},
+		});
+		const html = await fixture.readFile('/with-gfm/index.html');
+		const $ = cheerio.load(html);
+
+		// test 1: GFM autolink applied correctly
+		expect($('a[href="https://example.com"]')).to.have.lengthOf(1);
+
+		// test 2: remark plugins still applied
+		expect(html).to.include('Remark plugin applied!');
+
+		// test 3: rehype plugins still applied
+		expect($('#github-flavored-markdown-test')).to.have.lengthOf(1);
+		expect($('#github-flavored-markdown-test').hasClass('title')).to.equal(true);
+	});
+
+	for (const gfm of [true, false]) {
+		it(`Handles GFM when gfm = ${gfm}`, async () => {
 			const fixture = await buildFixture({
 				markdown: {
 					remarkPlugins: [remarkExamplePlugin],
 					rehypePlugins: [[addClasses, { 'h1,h2,h3': 'title' }]],
-					extendDefaultPlugins,
+					gfm,
 				},
 			});
 			const html = await fixture.readFile('/with-gfm/index.html');
 			const $ = cheerio.load(html);
 
 			// test 1: GFM autolink applied correctly
-			if (extendDefaultPlugins === true) {
+			if (gfm === true) {
 				expect($('a[href="https://example.com"]')).to.have.lengthOf(1);
 			} else {
 				expect($('a[href="https://example.com"]')).to.have.lengthOf(0);
 			}
 
-			// test 2: (sanity check) remark plugins still applied
+			// test 2: remark plugins still applied
 			expect(html).to.include('Remark plugin applied!');
 
-			// test 3: (sanity check) rehype plugins still applied
+			// test 3: rehype plugins still applied
 			expect($('#github-flavored-markdown-test')).to.have.lengthOf(1);
 			expect($('#github-flavored-markdown-test').hasClass('title')).to.equal(true);
 		});

packages/integrations/mdx/README.md

@@ -78,116 +78,100 @@ Visit the [MDX docs](https://mdxjs.com/docs/what-is-mdx/) to learn about using s
 
 Once the MDX integration is installed, no configuration is necessary to use `.mdx` files in your Astro project.
 
-You can extend how your MDX is rendered by adding remark, rehype and recma plugins.
+You can configure how your MDX is rendered with the following options:
 
-- [`extendPlugins`](#extendplugins)
-- [`remarkRehype`](#remarkrehype)
-- [`remarkPlugins`](#remarkplugins)
-- [`rehypePlugins`](#rehypeplugins)
+- [Options inherited from Markdown config](#options-inherited-from-markdown-config)
+- [`extendMarkdownConfig`](#extendmarkdownconfig)
 - [`recmaPlugins`](#recmaplugins)
 
-### `extendPlugins`
+### Options inherited from Markdown config
 
-You can customize how MDX files inherit your project’s existing Markdown configuration using the `extendPlugins` option.
+All [`markdown` configuration options](https://docs.astro.build/en/reference/configuration-reference/#markdown-options) except `drafts` can be configured separately in the MDX integration. This includes remark and rehype plugins, syntax highlighting, and more. Options will default to those in your Markdown config ([see the `extendMarkdownConfig` option](#extendmarkdownconfig) to modify this).
 
-#### `markdown` (default)
+:::note
+There is no separate MDX configuration for [including pages marked as draft in the build](https://docs.astro.build/en/reference/configuration-reference/#markdowndrafts). This Markdown setting will be respected by both Markdown and MDX files and cannot be overriden for MDX files specifically.
+:::
 
-Astro's MDX files will inherit all [`markdown` options](https://docs.astro.build/en/reference/configuration-reference/#markdown-options) in your Astro configuration file, which includes the [GitHub-Flavored Markdown](https://github.com/remarkjs/remark-gfm) and [Smartypants](https://github.com/silvenon/remark-smartypants) plugins by default.
-
-Any additional plugins you apply in your MDX config will be applied *after* your configured Markdown plugins.
-
-#### `astroDefaults`
-
-Astro's MDX files will apply only [Astro's default plugins](/en/reference/configuration-reference/#markdownextenddefaultplugins), without inheriting the rest of your Markdown config. 
-
-This example will apply the default [GitHub-Flavored Markdown](https://github.com/remarkjs/remark-gfm) and [Smartypants](https://github.com/silvenon/remark-smartypants) plugins alongside [`remark-toc`](https://github.com/remarkjs/remark-toc) to your MDX files, while ignoring any `markdown.remarkPlugins` configuration:
-
-```js "extendPlugins: 'astroDefaults'"
+```ts
 // astro.config.mjs
+import { defineConfig } from 'astro/config';
+import mdx from '@astrojs/mdx';
 import remarkToc from 'remark-toc';
+import rehypeMinifyHtml from 'rehype-minify-html';
 
-export default {
-  markdown: {
-    remarkPlugins: [/** ignored */]
-  },
-  integrations: [mdx({
-    remarkPlugins: [remarkToc],
-    // Astro defaults applied
-    extendPlugins: 'astroDefaults',
-  })],
-}
+export default defineConfig({
+  integrations: [
+    mdx({
+      syntaxHighlight: 'shiki',
+      shikiConfig: { theme: 'dracula' },
+      remarkPlugins: [remarkToc],
+      rehypePlugins: [rehypeMinifyHtml],
+      remarkRehype: { footnoteLabel: 'Footnotes' },
+      gfm: false,
+    })
+  ]
+})
 ```
 
-#### `false`
+:::caution
+MDX does not support passing remark and rehype plugins as a string. You should install, import, and apply the plugin function instead.
+:::
 
-Astro's MDX files will not inherit any [`markdown` options](https://docs.astro.build/en/reference/configuration-reference/#markdown-options), nor will any Astro Markdown defaults be applied:
+📚 See the [Markdown Options reference](https://docs.astro.build/en/reference/configuration-reference/#markdown-options) for a complete list of options.
 
-```js "extendPlugins: false"
-// astro.config.mjs
-import remarkToc from 'remark-toc';
-
-export default {
-  integrations: [mdx({
-    remarkPlugins: [remarkToc],
-    // Astro defaults not applied
-    extendPlugins: false,
-  })],
-}
-```
+### `extendMarkdownConfig`
 
-### `remarkRehype`
+- **Type:** `boolean`
+- **Default:** `true`
 
-Markdown content is transformed into HTML through remark-rehype which has [a number of options](https://github.com/remarkjs/remark-rehype#options).
+MDX will extend [your project's existing Markdown configuration](https://docs.astro.build/en/reference/configuration-reference/#markdown-options) by default. To override individual options, you can specify their equivalent in your MDX configuration.
 
-You can set remark-rehype options in your config file:
+For example, say you need to disable GitHub-Flavored Markdown and apply a different set of remark plugins for MDX files. You can apply these options like so, with `extendMarkdownConfig` enabled by default:
 
-```js
+```ts
 // astro.config.mjs
-export default {
-  integrations: [mdx({
-    remarkRehype: {
-      footnoteLabel: 'Catatan kaki',
-      footnoteBackLabel: 'Kembali ke konten',
-    },
-  })],
-};
-```
-This inherits the configuration of [`markdown.remarkRehype`](https://docs.astro.build/en/reference/configuration-reference/#markdownremarkrehype). This behavior can be changed by configuring `extendPlugins`.
-
-### `remarkPlugins`
-
-Browse [awesome-remark](https://github.com/remarkjs/awesome-remark) for a full curated list of [remark plugins](https://github.com/remarkjs/remark/blob/main/doc/plugins.md) to extend your Markdown's capabilities.
-
-This example applies the [`remark-toc`](https://github.com/remarkjs/remark-toc) plugin to `.mdx` files. To customize plugin inheritance from your Markdown config or Astro's defaults, [see the `extendPlugins` option](#extendplugins).
-
-```js
-// astro.config.mjs
-import remarkToc from 'remark-toc';
+import { defineConfig } from 'astro/config';
+import mdx from '@astrojs/mdx';
 
-export default {
-  integrations: [mdx({
-    remarkPlugins: [remarkToc],
-  })],
-}
+export default defineConfig({
+  markdown: {
+    syntaxHighlight: 'prism',
+    remarkPlugins: [remarkPlugin1],
+    gfm: true,
+  },
+  integrations: [
+    mdx({
+      // `syntaxHighlight` inherited from Markdown
+
+      // Markdown `remarkPlugins` ignored,
+      // only `remarkPlugin2` applied.
+      remarkPlugins: [remarkPlugin2],
+      // `gfm` overridden to `false`
+      gfm: false,
+    })
+  ]
+});
 ```
 
-### `rehypePlugins`
-
- Browse [awesome-rehype](https://github.com/rehypejs/awesome-rehype) for a full curated list of [Rehype plugins](https://github.com/rehypejs/rehype/blob/main/doc/plugins.md) to transform the HTML that your Markdown generates.
+You may also need to disable `markdown` config extension in MDX. For this, set `extendMarkdownConfig` to `false`:
 
-We apply our own (non-removable) [`collect-headings`](https://github.com/withastro/astro/blob/main/packages/integrations/mdx/src/rehype-collect-headings.ts) plugin. This applies IDs to all headings (i.e. `h1 -> h6`) in your MDX files to [link to headings via anchor tags](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/a#linking_to_an_element_on_the_same_page).
-
-This example applies the [`rehype-accessible-emojis`](https://www.npmjs.com/package/rehype-accessible-emojis) plugin to `.mdx` files. To customize plugin inheritance from your Markdown config or Astro's defaults, [see the `extendPlugins` option](#extendplugins).
-
-```js
+```ts
 // astro.config.mjs
-import rehypeAccessibleEmojis from 'rehype-accessible-emojis';
+import { defineConfig } from 'astro/config';
+import mdx from '@astrojs/mdx';
 
-export default {
-  integrations: [mdx({
-    rehypePlugins: [rehypeAccessibleEmojis],
-  })],
-}
+export default defineConfig({
+  markdown: {
+    remarkPlugins: [remarkPlugin1],
+  },
+  integrations: [
+    mdx({
+      // Markdown config now ignored
+      extendMarkdownConfig: false,
+      // No `remarkPlugins` applied
+    })
+  ]
+});
 ```
 
 ### `recmaPlugins`

packages/integrations/mdx/package.json

@@ -43,7 +43,6 @@
     "rehype-raw": "^6.1.1",
     "remark-frontmatter": "^4.0.1",
     "remark-gfm": "^3.0.1",
-    "remark-smartypants": "^2.0.0",
     "shiki": "^0.11.1",
     "unist-util-visit": "^4.1.0",
     "vfile": "^5.3.2"