refactor: extract MDX components (#6989)

packages/docusaurus-theme-classic/src/getSwizzleConfig.ts

@@ -136,6 +136,68 @@ export default function getSwizzleConfig(): SwizzleConfig {
         description:
           'The MDX components to use for rendering MDX files. Meant to be ejected.',
       },
+      'MDXComponents/A': {
+        actions: {
+          eject: 'safe',
+          wrap: 'safe',
+        },
+        description:
+          'The component used to render <a> tags and Markdown links in MDX',
+      },
+      'MDXComponents/Code': {
+        actions: {
+          eject: 'safe',
+          wrap: 'safe',
+        },
+        description:
+          'The component used to render <code> tags and Markdown code blocks in MDX',
+      },
+      'MDXComponents/Details': {
+        actions: {
+          eject: 'safe',
+          wrap: 'safe',
+        },
+        description: 'The component used to render <details> tags in MDX',
+      },
+      'MDXComponents/Head': {
+        actions: {
+          eject: 'forbidden',
+          wrap: 'forbidden',
+        },
+        description:
+          'Technical component used to assign metadata (generally for SEO purpose) to the current MDX document',
+      },
+      'MDXComponents/Heading': {
+        actions: {
+          eject: 'safe',
+          wrap: 'safe',
+        },
+        description:
+          'The component used to render heading tags (<h1>, <h2>...) and Markdown headings in MDX',
+      },
+      'MDXComponents/Img': {
+        actions: {
+          eject: 'safe',
+          wrap: 'safe',
+        },
+        description:
+          'The component used to render <img> tags and Markdown images in MDX',
+      },
+      'MDXComponents/Pre': {
+        actions: {
+          eject: 'safe',
+          wrap: 'safe',
+        },
+        description: 'The component used to render <pre> tags in MDX',
+      },
+      'MDXComponents/Ul': {
+        actions: {
+          eject: 'safe',
+          wrap: 'safe',
+        },
+        description:
+          'The component used to render <ul> tags and Markdown unordered lists in MDX',
+      },
       MDXContent: {
         actions: {
           eject: 'safe',

packages/docusaurus-theme-classic/src/theme-classic.d.ts

@@ -417,24 +417,97 @@ declare module '@theme/SkipToContent' {
   export default function SkipToContent(): JSX.Element;
 }
 
-declare module '@theme/MDXComponents' {
+declare module '@theme/MDXComponents/A' {
+  import type {ComponentProps} from 'react';
+
+  export interface Props extends ComponentProps<'a'> {}
+
+  export default function MDXA(props: Props): JSX.Element;
+}
+
+declare module '@theme/MDXComponents/Code' {
+  import type {ComponentProps} from 'react';
+
+  export interface Props extends ComponentProps<'code'> {}
+
+  export default function MDXCode(props: Props): JSX.Element;
+}
+
+declare module '@theme/MDXComponents/Details' {
   import type {ComponentProps} from 'react';
-  import type CodeBlock from '@theme/CodeBlock';
-  import type Head from '@docusaurus/Head';
+
+  export interface Props extends ComponentProps<'details'> {}
+
+  export default function MDXDetails(props: Props): JSX.Element;
+}
+
+declare module '@theme/MDXComponents/Ul' {
+  import type {ComponentProps} from 'react';
+
+  export interface Props extends ComponentProps<'ul'> {}
+
+  export default function MDXUl(props: Props): JSX.Element;
+}
+
+declare module '@theme/MDXComponents/Img' {
+  import type {ComponentProps} from 'react';
+
+  export interface Props extends ComponentProps<'img'> {}
+
+  export default function MDXImg(props: Props): JSX.Element;
+}
+
+declare module '@theme/MDXComponents/Head' {
+  import type {ComponentProps} from 'react';
+
+  export interface Props extends ComponentProps<'head'> {}
+
+  export default function MDXHead(props: Props): JSX.Element;
+}
+
+declare module '@theme/MDXComponents/Heading' {
+  import type {ComponentProps} from 'react';
+  import type Heading from '@theme/Heading';
+
+  export interface Props extends ComponentProps<typeof Heading> {}
+
+  export default function MDXHeading(props: Props): JSX.Element;
+}
+
+declare module '@theme/MDXComponents/Pre' {
+  import type {ComponentProps} from 'react';
+
+  export interface Props extends ComponentProps<'pre'> {}
+
+  export default function MDXPre(props: Props): JSX.Element;
+}
+
+declare module '@theme/MDXComponents' {
+  import type {ComponentType, ComponentProps} from 'react';
+
+  import type MDXHead from '@theme/MDXComponents/Head';
+  import type MDXCode from '@theme/MDXComponents/Code';
+  import type MDXA from '@theme/MDXComponents/A';
+  import type MDXPre from '@theme/MDXComponents/Pre';
+  import type MDXDetails from '@theme/MDXComponents/Details';
+  import type MDXUl from '@theme/MDXComponents/Ul';
+  import type MDXImg from '@theme/MDXComponents/Img';
 
   export type MDXComponentsObject = {
-    readonly head: typeof Head;
-    readonly code: typeof CodeBlock;
-    readonly a: (props: ComponentProps<'a'>) => JSX.Element;
-    readonly pre: typeof CodeBlock;
-    readonly details: (props: ComponentProps<'details'>) => JSX.Element;
+    readonly head: typeof MDXHead;
+    readonly code: typeof MDXCode;
+    readonly a: typeof MDXA;
+    readonly pre: typeof MDXPre;
+    readonly details: typeof MDXDetails;
+    readonly ul: typeof MDXUl;
+    readonly img: typeof MDXImg;
     readonly h1: (props: ComponentProps<'h1'>) => JSX.Element;
     readonly h2: (props: ComponentProps<'h2'>) => JSX.Element;
     readonly h3: (props: ComponentProps<'h3'>) => JSX.Element;
     readonly h4: (props: ComponentProps<'h4'>) => JSX.Element;
     readonly h5: (props: ComponentProps<'h5'>) => JSX.Element;
     readonly h6: (props: ComponentProps<'h6'>) => JSX.Element;
-  };
+  } & Record<string, ComponentType<unknown>>;
 
   const MDXComponents: MDXComponentsObject;
   export default MDXComponents;

packages/docusaurus-theme-classic/src/theme/MDXComponents/A.tsx

@@ -0,0 +1,14 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import React from 'react';
+import Link from '@docusaurus/Link';
+import type {Props} from '@theme/MDXComponents/A';
+
+export default function MDXA(props: Props): JSX.Element {
+  return <Link {...props} />;
+}

packages/docusaurus-theme-classic/src/theme/MDXComponents/Code.tsx

@@ -0,0 +1,37 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import type {ComponentProps} from 'react';
+import React, {isValidElement} from 'react';
+import CodeBlock from '@theme/CodeBlock';
+import type {Props} from '@theme/MDXComponents/Code';
+
+export default function MDXCode(props: Props): JSX.Element {
+  const inlineElements = [
+    'a',
+    'b',
+    'big',
+    'i',
+    'span',
+    'em',
+    'strong',
+    'sup',
+    'sub',
+    'small',
+  ];
+  const shouldBeInline = React.Children.toArray(props.children).every(
+    (el) =>
+      (typeof el === 'string' && !el.includes('\n')) ||
+      (isValidElement(el) && inlineElements.includes(el.props.mdxType)),
+  );
+
+  return shouldBeInline ? (
+    <code {...props} />
+  ) : (
+    <CodeBlock {...(props as ComponentProps<typeof CodeBlock>)} />
+  );
+}

packages/docusaurus-theme-classic/src/theme/MDXComponents/Details.tsx

@@ -0,0 +1,26 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import React, {type ComponentProps, type ReactElement} from 'react';
+import Details from '@theme/Details';
+import type {Props} from '@theme/MDXComponents/Details';
+
+export default function MDXDetails(props: Props): JSX.Element {
+  const items = React.Children.toArray(props.children) as ReactElement[];
+  // Split summary item from the rest to pass it as a separate prop to the
+  // Details theme component
+  const summary: ReactElement<ComponentProps<'summary'>> = items.find(
+    (item) => item?.props?.mdxType === 'summary',
+  )!;
+  const children = <>{items.filter((item) => item !== summary)}</>;
+
+  return (
+    <Details {...props} summary={summary}>
+      {children}
+    </Details>
+  );
+}

packages/docusaurus-theme-classic/src/theme/MDXComponents/Head.tsx

@@ -0,0 +1,29 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import React, {type ReactElement, type ComponentProps} from 'react';
+import Head from '@docusaurus/Head';
+import type {Props} from '@theme/MDXComponents/Head';
+
+// MDX elements are wrapped through the MDX pragma. In some cases (notably usage
+// with Head/Helmet) we need to unwrap those elements.
+function unwrapMDXElement(element: ReactElement) {
+  if (element?.props?.mdxType && element?.props?.originalType) {
+    const {mdxType, originalType, ...newProps} = element.props;
+    return React.createElement(element.props.originalType, newProps);
+  }
+  return element;
+}
+
+export default function MDXHead(props: Props): JSX.Element {
+  const unwrappedChildren = React.Children.map(props.children, (child) =>
+    unwrapMDXElement(child as ReactElement),
+  );
+  return (
+    <Head {...(props as ComponentProps<typeof Head>)}>{unwrappedChildren}</Head>
+  );
+}

packages/docusaurus-theme-classic/src/theme/MDXComponents/Heading.tsx

@@ -0,0 +1,14 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import React from 'react';
+import Heading from '@theme/Heading';
+import type {Props} from '@theme/MDXComponents/Heading';
+
+export default function MDXHeading(props: Props): JSX.Element {
+  return <Heading {...props} />;
+}

packages/docusaurus-theme-classic/src/theme/MDXComponents/Img.module.css

@@ -0,0 +1,10 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+.img {
+  height: auto;
+}

packages/docusaurus-theme-classic/src/theme/MDXComponents/Img.tsx

@@ -0,0 +1,20 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import React from 'react';
+import type {Props} from '@theme/MDXComponents/Img';
+import styles from './Img.module.css';
+import clsx from 'clsx';
+
+function transformImgClassName(className?: string): string {
+  return clsx(className, styles.img);
+}
+
+export default function MDXImg(props: Props): JSX.Element {
+  // eslint-disable-next-line jsx-a11y/alt-text
+  return <img {...props} className={transformImgClassName(props.className)} />;
+}

packages/docusaurus-theme-classic/src/theme/MDXComponents/Pre.tsx

@@ -0,0 +1,21 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import React, {isValidElement} from 'react';
+import CodeBlock from '@theme/CodeBlock';
+
+export default function MDXPre(props: any) {
+  return (
+    <CodeBlock
+      // If this pre is created by a ``` fenced codeblock, unwrap the children
+      {...(isValidElement(props.children) &&
+      props.children.props.originalType === 'code'
+        ? props.children?.props
+        : {...props})}
+    />
+  );
+}

packages/docusaurus-theme-classic/src/theme/MDXComponents/styles.css → packages/docusaurus-theme-classic/src/theme/MDXComponents/Ul.module.css

@@ -5,11 +5,7 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-ul.contains-task-list {
+.contains-task-list {
   padding-left: 0;
   list-style: none;
 }
-
-img {
-  height: auto;
-}

packages/docusaurus-theme-classic/src/theme/MDXComponents/Ul.tsx

@@ -0,0 +1,28 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import React from 'react';
+import clsx from 'clsx';
+import type {Props} from '@theme/MDXComponents/Ul';
+
+import styles from './Ul.module.css';
+
+const containsClassListLocalClass = styles['contains-task-list'];
+
+function transformUlClassName(className?: string): string {
+  return clsx(
+    className,
+    // This class is set globally by GitHub/MDX
+    // We keep the global class, but apply scoped CSS
+    // See https://github.com/syntax-tree/mdast-util-to-hast/issues/28
+    className?.includes('contains-task-list') && containsClassListLocalClass,
+  );
+}
+
+export default function MDXUl(props: Props): JSX.Element {
+  return <ul {...props} className={transformUlClassName(props.className)} />;
+}