feat(v2): inline table-of-contents + refactor TOC (#3904)

* Add TOCInline theme component

* Add TOCInline theme component doc + migration guide

* remove useless getPathsToWatch on classic theme

* rename rightToc to toc

* add temp theme-bootstrap TOCInline comp to fix build issue

packages/docusaurus-mdx-loader/src/index.js

@@ -12,13 +12,13 @@ const emoji = require('remark-emoji');
 const matter = require('gray-matter');
 const stringifyObject = require('stringify-object');
 const slug = require('./remark/slug');
-const rightToc = require('./remark/rightToc');
+const toc = require('./remark/toc');
 const transformImage = require('./remark/transformImage');
 const transformLinks = require('./remark/transformLinks');
 
 const DEFAULT_OPTIONS = {
   rehypePlugins: [],
-  remarkPlugins: [emoji, slug, rightToc],
+  remarkPlugins: [emoji, slug, toc],
 };
 
 module.exports = async function docusaurusMdxLoader(fileString) {

packages/docusaurus-mdx-loader/src/remark/toc/__tests__/__snapshots__/index.test.js.snap

@@ -1,7 +1,7 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
 exports[`inline code should be escaped 1`] = `
-"export const rightToc = [
+"export const toc = [
 	{
 		value: '<code>&lt;Head /&gt;</code>',
 		id: 'head-',
@@ -43,7 +43,7 @@ exports[`inline code should be escaped 1`] = `
 `;
 
 exports[`non text phrasing content 1`] = `
-"export const rightToc = [
+"export const toc = [
 	{
 		value: '<em>Emphasis</em>',
 		id: 'emphasis',

packages/docusaurus-mdx-loader/src/remark/toc/__tests__/fixtures/name-exist.md

@@ -1,4 +1,4 @@
-export const rightToc = ['replaceMe'];
+export const toc = ['replaceMe'];
 
 ## Thanos
 

packages/docusaurus-mdx-loader/src/remark/toc/__tests__/index.test.js

@@ -37,7 +37,7 @@ test('inline code should be escaped', async () => {
 test('text content', async () => {
   const result = await processFixture('just-content');
   expect(result).toMatchInlineSnapshot(`
-    "export const rightToc = [
+    "export const toc = [
     	{
     		value: 'Endi',
     		id: 'endi',
@@ -83,7 +83,7 @@ test('text content', async () => {
 test('should export even with existing name', async () => {
   const result = await processFixture('name-exist');
   expect(result).toMatchInlineSnapshot(`
-    "export const rightToc = [
+    "export const toc = [
     	{
     		value: 'Thanos',
     		id: 'thanos',
@@ -167,7 +167,7 @@ test('should insert below imports', async () => {
 
     import somethingElse from 'something-else';
 
-    export const rightToc = [
+    export const toc = [
     	{
     		value: 'Title',
     		id: 'title',
@@ -200,7 +200,7 @@ test('should insert below imports', async () => {
 test('empty headings', async () => {
   const result = await processFixture('empty-headings');
   expect(result).toMatchInlineSnapshot(`
-    "export const rightToc = [];
+    "export const toc = [];
 
     # Ignore this
 

packages/docusaurus-mdx-loader/src/remark/toc/index.js

@@ -59,7 +59,7 @@ const getOrCreateExistingTargetIndex = (children, name) => {
 };
 
 const plugin = (options = {}) => {
-  const name = options.name || 'rightToc';
+  const name = options.name || 'toc';
 
   const transformer = (node) => {
     const headings = search(node);

packages/docusaurus-mdx-loader/src/remark/toc/search.js

@@ -11,7 +11,7 @@ const toString = require('mdast-util-to-string');
 const visit = require('unist-util-visit');
 const {toValue} = require('../utils');
 
-/** @typedef {import('@docusaurus/types').MarkdownRightTableOfContents} TOC */
+/** @typedef {import('@docusaurus/types').TOCItem} TOC */
 /** @typedef {import('unist').Node} Node */
 
 /**

packages/docusaurus-plugin-content-blog/index.d.ts

@@ -24,7 +24,7 @@ declare module '@theme/BlogSidebar' {
 }
 
 declare module '@theme/BlogPostPage' {
-  import type {MarkdownRightTableOfContents} from '@docusaurus/types';
+  import type {TOCItem} from '@docusaurus/types';
   import type {BlogSidebar} from '@theme/BlogSidebar';
 
   export type FrontMatter = {
@@ -61,7 +61,7 @@ declare module '@theme/BlogPostPage' {
   export type Content = {
     readonly frontMatter: FrontMatter;
     readonly metadata: Metadata;
-    readonly rightToc: readonly MarkdownRightTableOfContents[];
+    readonly toc: readonly TOCItem[];
     (): JSX.Element;
   };
 

packages/docusaurus-plugin-content-docs/src/plugin-content-docs.d.ts

@@ -46,7 +46,7 @@ declare module '@docusaurus/plugin-content-docs-types' {
 }
 
 declare module '@theme/DocItem' {
-  import type {MarkdownRightTableOfContents} from '@docusaurus/types';
+  import type {TOCItem} from '@docusaurus/types';
 
   export type DocumentRoute = {
     readonly component: () => JSX.Element;
@@ -80,7 +80,7 @@ declare module '@theme/DocItem' {
     readonly content: {
       readonly frontMatter: FrontMatter;
       readonly metadata: Metadata;
-      readonly rightToc: readonly MarkdownRightTableOfContents[];
+      readonly toc: readonly TOCItem[];
       (): JSX.Element;
     };
   };

packages/docusaurus-plugin-content-pages/src/plugin-content-pages.d.ts

@@ -6,7 +6,7 @@
  */
 
 declare module '@theme/MDXPage' {
-  import type {MarkdownRightTableOfContents} from '@docusaurus/types';
+  import type {TOCItem} from '@docusaurus/types';
 
   export type Props = {
     readonly content: {
@@ -17,7 +17,7 @@ declare module '@theme/MDXPage' {
         readonly hide_table_of_contents?: string;
       };
       readonly metadata: {readonly permalink: string};
-      readonly rightToc: readonly MarkdownRightTableOfContents[];
+      readonly toc: readonly TOCItem[];
       (): JSX.Element;
     };
   };

packages/docusaurus-theme-bootstrap/src/theme/TOCInline/index.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';
+
+function TOCInline(_props: any): JSX.Element {
+  return <div>TODO bootstrap toc</div>;
+}
+
+export default TOCInline;

packages/docusaurus-theme-classic/package.json

@@ -15,7 +15,7 @@
   "license": "MIT",
   "scripts": {
     "build": "tsc --noEmit && yarn babel:lib && yarn babel:lib-next && yarn prettier",
-    "watch": "yarn babel:lib --watch",
+    "watch": "concurrently -n \"lib,lib-next\" --kill-others \"yarn babel:lib --watch\" \"yarn babel:lib-next --watch\"",
     "babel:lib": "cross-env BABEL_ENV=lib babel src -d lib --extensions \".tsx,.ts\" --ignore \"**/*.d.ts\" --copy-files",
     "babel:lib-next": "cross-env BABEL_ENV=lib-next babel src -d lib-next --extensions \".tsx,.ts\" --ignore \"**/*.d.ts\" --copy-files",
     "prettier": "prettier --config ../../.prettierrc --ignore-path ../../.prettierignore --write \"**/*.{js,ts}\""

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

@@ -72,6 +72,16 @@ export default function docusaurusThemeClassic(
   return {
     name: 'docusaurus-theme-classic',
 
+    /*
+    Does not seem needed: webpack can already hot reload theme files
+    getPathsToWatch() {
+      return [
+        path.join(__dirname, '..', 'lib'),
+        path.join(__dirname, '..', 'lib-next'),
+      ];
+    },
+     */
+
     getThemePath() {
       return path.join(__dirname, '..', 'lib-next', 'theme');
     },

packages/docusaurus-theme-classic/src/theme/BlogPostPage/index.tsx

@@ -53,9 +53,9 @@ function BlogPostPage(props: Props): JSX.Element {
                 </div>
               )}
             </main>
-            {!hideTableOfContents && BlogPostContents.rightToc && (
+            {!hideTableOfContents && BlogPostContents.toc && (
               <div className="col col--2">
-                <TOC headings={BlogPostContents.rightToc} />
+                <TOC toc={BlogPostContents.toc} />
               </div>
             )}
           </div>

packages/docusaurus-theme-classic/src/theme/DocItem/index.tsx

@@ -162,9 +162,9 @@ function DocItem(props: Props): JSX.Element {
             </div>
           </div>
         </div>
-        {!hideTableOfContents && DocContent.rightToc && (
+        {!hideTableOfContents && DocContent.toc && (
           <div className="col col--3">
-            <TOC headings={DocContent.rightToc} />
+            <TOC toc={DocContent.toc} />
           </div>
         )}
       </div>

packages/docusaurus-theme-classic/src/theme/MDXPage/index.tsx

@@ -41,9 +41,9 @@ function MDXPage(props: Props): JSX.Element {
                   </MDXProvider>
                 </div>
               </div>
-              {!hideTableOfContents && MDXPageContent.rightToc && (
+              {!hideTableOfContents && MDXPageContent.toc && (
                 <div className="col col--2">
-                  <TOC headings={MDXPageContent.rightToc} />
+                  <TOC toc={MDXPageContent.toc} />
                 </div>
               )}
             </div>

packages/docusaurus-theme-classic/src/theme/TOC/index.tsx

@@ -10,14 +10,21 @@ import clsx from 'clsx';
 import useTOCHighlight from '@theme/hooks/useTOCHighlight';
 import type {TOCProps} from '@theme/TOC';
 import styles from './styles.module.css';
+import {TOCItem} from '@docusaurus/types';
 
 const LINK_CLASS_NAME = 'table-of-contents__link';
 const ACTIVE_LINK_CLASS_NAME = 'table-of-contents__link--active';
 const TOP_OFFSET = 100;
 
 /* eslint-disable jsx-a11y/control-has-associated-label */
-function Headings({headings, isChild}: TOCProps & {isChild?: boolean}) {
+function Headings({
-  if (!headings.length) {
+  toc,
+  isChild,
+}: {
+  toc: readonly TOCItem[];
+  isChild?: boolean;
+}) {
+  if (!toc.length) {
     return null;
   }
   return (
@@ -25,7 +32,7 @@ function Headings({headings, isChild}: TOCProps & {isChild?: boolean}) {
       className={
         isChild ? '' : 'table-of-contents table-of-contents__left-border'
       }>
-      {headings.map((heading) => (
+      {toc.map((heading) => (
         <li key={heading.id}>
           <a
             href={`#${heading.id}`}
@@ -34,18 +41,18 @@ function Headings({headings, isChild}: TOCProps & {isChild?: boolean}) {
             // eslint-disable-next-line react/no-danger
             dangerouslySetInnerHTML={{__html: heading.value}}
           />
-          <Headings isChild headings={heading.children} />
+          <Headings isChild toc={heading.children} />
         </li>
       ))}
     </ul>
   );
 }
 
-function TOC({headings}: TOCProps): JSX.Element {
+function TOC({toc}: TOCProps): JSX.Element {
   useTOCHighlight(LINK_CLASS_NAME, ACTIVE_LINK_CLASS_NAME, TOP_OFFSET);
   return (
     <div className={clsx(styles.tableOfContents, 'thin-scrollbar')}>
-      <Headings headings={headings} />
+      <Headings toc={toc} />
     </div>
   );
 }

packages/docusaurus-theme-classic/src/theme/TOCInline/index.tsx

@@ -0,0 +1,53 @@
+/**
+ * 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 {TOCProps} from '@theme/TOC';
+import styles from './styles.module.css';
+import {TOCItem} from '@docusaurus/types';
+
+const LINK_CLASS_NAME = styles['table-of-contents__link--inline'];
+
+/* eslint-disable jsx-a11y/control-has-associated-label */
+function HeadingsInline({
+  toc,
+  isChild,
+}: {
+  toc: readonly TOCItem[];
+  isChild?: boolean;
+}) {
+  if (!toc.length) {
+    return null;
+  }
+  return (
+    <ul className={isChild ? '' : 'table-of-contents'}>
+      {toc.map((heading) => (
+        <li key={heading.id}>
+          <a
+            href={`#${heading.id}`}
+            className={LINK_CLASS_NAME}
+            // Developer provided the HTML, so assume it's safe.
+            // eslint-disable-next-line react/no-danger
+            dangerouslySetInnerHTML={{__html: heading.value}}
+          />
+          <HeadingsInline isChild toc={heading.children} />
+        </li>
+      ))}
+    </ul>
+  );
+}
+
+function TOCInline({toc}: TOCProps): JSX.Element {
+  return (
+    <div className={clsx(styles.tableOfContentsInline)}>
+      <HeadingsInline toc={toc} />
+    </div>
+  );
+}
+
+export default TOCInline;

packages/docusaurus-theme-classic/src/theme/TOCInline/styles.module.css

@@ -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.
+ */
+
+.tableOfContentsInline ul {
+  list-style-type: disc;
+}
+
+.table-of-contents__link--inline {
+  color: var(--ifm-toc-link-color);
+}

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

@@ -413,16 +413,27 @@ declare module '@theme/ThemeProvider' {
 }
 
 declare module '@theme/TOC' {
-  import type {MarkdownRightTableOfContents} from '@docusaurus/types';
+  import type {TOCItem} from '@docusaurus/types';
 
   export type TOCProps = {
-    readonly headings: readonly MarkdownRightTableOfContents[];
+    readonly toc: readonly TOCItem[];
   };
 
   const TOC: (props: TOCProps) => JSX.Element;
   export default TOC;
 }
 
+declare module '@theme/TOCInline' {
+  import type {TOCItem} from '@docusaurus/types';
+
+  export type TOCInlineProps = {
+    readonly toc: readonly TOCItem[];
+  };
+
+  const TOCInline: (props: TOCInlineProps) => JSX.Element;
+  export default TOCInline;
+}
+
 declare module '@theme/Toggle' {
   import {ComponentProps} from 'react';
   import ReactToggle from 'react-toggle';

packages/docusaurus-types/src/index.d.ts

@@ -344,8 +344,8 @@ export interface ValidationSchema<T> {
   append(data: any): ValidationSchema<T>;
 }
 
-export interface MarkdownRightTableOfContents {
+export interface TOCItem {
   readonly value: string;
   readonly id: string;
-  readonly children: MarkdownRightTableOfContents[];
+  readonly children: TOCItem[];
 }

website/docs/cli.md

@@ -20,6 +20,12 @@ Once your website is bootstrapped, the website source will contain the Docusauru
 }
 ```
 
+## Index
+
+import TOCInline from "@theme/TOCInline"
+
+<TOCInline toc={toc[1].children}/>
+
 ## Docusaurus CLI commands
 
 Below is a list of Docusaurus CLI commands and their usages:

website/docs/markdown-features.mdx

@@ -471,6 +471,61 @@ import TabItem from '@theme/TabItem';
   <TabItem value="banana">This is a banana 🍌</TabItem>
 </Tabs>
 
+## Inline table of contents
+
+Each markdown document displays a tab of content on the top-right corner.
+
+But it is also possible to display an inline table of contents directly inside a markdown document, thanks to MDX.
+
+### Full table of contents
+
+The `toc` variable is available in any MDX document, and contain all the top level headings of a MDX document.
+
+```jsx
+import TOCInline from '@theme/TOCInline';
+
+<TOCInline toc={toc} />;
+```
+
+import TOCInline from '@theme/TOCInline';
+
+<BrowserWindow>
+
+<TOCInline toc={toc} />
+
+</BrowserWindow>
+
+### Custom table of contents
+
+The `toc` props is just a list of table of contents items:
+
+```ts
+type TOCItem = {
+  value: string;
+  id: string;
+  children: TOCItem[];
+};
+```
+
+You can create this TOC tree manually, or derive a new TOC tree from the `toc` variable:
+
+```jsx
+import TOCInline from '@theme/TOCInline';
+
+<TOCInline
+  toc={
+    // Only show 4th and 5th top-level heading
+    [toc[3], toc[4]]
+  }
+/>;
+```
+
+<BrowserWindow>
+
+<TOCInline toc={[toc[3], toc[4]]} />
+
+</BrowserWindow>
+
 ## Callouts/admonitions
 
 In addition to the basic Markdown syntax, we use [remark-admonitions](https://github.com/elviswolcott/remark-admonitions) alongside MDX to add support for admonitions. Admonitions are wrapped by a set of 3 colons.

website/docs/migration/migration-manual.md

@@ -554,9 +554,9 @@ The following code could be helpful for migration of various pages:
 
 ## Content
 
-### Remove AUTOGENERATED_TABLE_OF_CONTENTS
+### Replace AUTOGENERATED_TABLE_OF_CONTENTS
 
-This feature is deprecated. You may read more about it in [this issue](https://github.com/facebook/docusaurus/issues/1549). If you need the feature, use [remark-toc](https://github.com/remarkjs/remark-toc) instead and pass it to docs plugin's `remarkPlugins` option.
+This feature is replaced by [inline table of content](../markdown-features.mdx#inline-table-of-contents)
 
 ### Update Markdown syntax to be MDX-compatible