[docs] Link to demos and API in IntelliSense (mui#20078)

docs/pages/api-docs/alert-title.md

@@ -48,3 +48,7 @@ You can override the style of the component thanks to one of these customization
 
 If that's not sufficient, you can check the [implementation of the component](https://github.com/mui-org/material-ui/blob/master/packages/material-ui-lab/src/AlertTitle/AlertTitle.js) for more detail.
 
+## Demos
+
+- [Alert](/components/alert/)
+

docs/pages/api-docs/menu-list.md

@@ -18,7 +18,7 @@ import { MenuList } from '@material-ui/core';
 
 You can learn more about the difference by [reading this guide](/guides/minimizing-bundle-size/).
 
-A permanently displayed menu following https://www.w3.org/TR/wai-aria-practices/#menubutton
+A permanently displayed menu following https://www.w3.org/TR/wai-aria-practices/#menubutton.
 It's exposed to help customization of the [`Menu`](/api/menu/) component. If you
 use it separately you need to move focus into the component manually. Once
 the focus is placed inside the component it is fully keyboard accessible.

docs/scripts/buildApi.js

@@ -1,14 +1,21 @@
 /* eslint-disable no-console */
+import * as babel from '@babel/core';
+import traverse from '@babel/traverse';
 import { mkdir, readFileSync, writeFileSync } from 'fs';
 import { getLineFeed } from './helpers';
+import { rewriteUrlForNextExport } from 'next/dist/next-server/lib/router/rewrite-url-for-export';
 import path from 'path';
 import kebabCase from 'lodash/kebabCase';
+import uniqBy from 'lodash/uniqBy';
 import { defaultHandlers, parse as docgenParse } from 'react-docgen';
+import remark from 'remark';
+import remarkVisit from 'unist-util-visit';
 import muiDefaultPropsHandler from '../src/modules/utils/defaultPropsHandler';
 import generateMarkdown from '../src/modules/utils/generateMarkdown';
 import { findPagesMarkdown, findComponents } from '../src/modules/utils/find';
 import { getHeaders } from '../src/modules/utils/parseMarkdown';
 import parseTest from '../src/modules/utils/parseTest';
+import { pageToTitle } from '../src/modules/utils/helpers';
 import createMuiTheme from '../../packages/material-ui/src/styles/createMuiTheme';
 import getStylesCreator from '../../packages/material-ui-styles/src/getStylesCreator';
 import createGenerateClassName from '../../packages/material-ui-styles/src/createGenerateClassName';
@@ -80,6 +87,123 @@ function getInheritance(testInfo, src) {
   };
 }
 
+/**
+ * Produces markdown of the description that can be hosted anywhere.
+ *
+ * By default we assume that the markdown is hosted on material-ui.com which is
+ * why the source includes relative url. We transform them to absolute urls with
+ * this method.
+ *
+ * @param {object} api
+ * @param {object} options
+ */
+function computeApiDescription(api, options) {
+  const { host } = options;
+  return new Promise((resolve, reject) => {
+    remark()
+      .use(function docsLinksAttacher() {
+        return function transformer(tree) {
+          remarkVisit(tree, 'link', linkNode => {
+            if (linkNode.url.startsWith('/')) {
+              linkNode.url = `${host}${linkNode.url}`;
+            }
+          });
+        };
+      })
+      .process(api.description, (error, file) => {
+        if (error) reject(error);
+
+        resolve(file.contents.trim());
+      });
+  });
+}
+
+async function annotateComponentDefinition(component, api) {
+  const HOST = 'https://material-ui.com';
+
+  const typesFilename = component.filename.replace(/\.js$/, '.d.ts');
+  const typesSource = readFileSync(typesFilename, { encoding: 'utf8' });
+  const typesAST = await babel.parseAsync(typesSource, {
+    configFile: false,
+    filename: typesFilename,
+    presets: [require.resolve('@babel/preset-typescript')],
+  });
+
+  let start = null;
+  let end = null;
+  traverse(typesAST, {
+    ExportDefaultDeclaration(babelPath) {
+      // export default function Menu() {}
+      let node = babelPath.node;
+      if (node.declaration.type === 'Identifier') {
+        // declare const Menu: {};
+        // export default Menu;
+        const bindingId = babelPath.node.declaration.name;
+        const binding = babelPath.scope.bindings[bindingId];
+        node = binding.path.parentPath.node;
+      }
+
+      const { leadingComments = [] } = node;
+      const [jsdocBlock, ...rest] = leadingComments;
+      if (rest.length > 0) {
+        throw new Error('Should only have a single leading jsdoc block');
+      }
+      if (jsdocBlock !== undefined) {
+        start = jsdocBlock.start;
+        end = jsdocBlock.end;
+      } else {
+        start = node.start - 1;
+        end = start;
+      }
+    },
+  });
+
+  if (end === null || start === 0) {
+    throw new TypeError(
+      "Don't know where to insert the jsdoc block. Probably no `default export` found",
+    );
+  }
+
+  const demos = uniqBy(
+    api.pagesMarkdown.filter(page => {
+      return page.components.includes(api.name);
+    }, []),
+    page => page.pathname,
+  );
+
+  let inheritanceAPILink = null;
+  if (api.inheritance !== null) {
+    const url = api.inheritance.pathname.startsWith('/')
+      ? `${HOST}${rewriteUrlForNextExport(api.inheritance.pathname)}`
+      : api.inheritance.pathname;
+
+    inheritanceAPILink = `[${api.inheritance.component} API](${url})`;
+  }
+
+  const markdownLines = (await computeApiDescription(api, { host: HOST })).split('\n');
+  if (demos.length > 0) {
+    markdownLines.push(
+      'Demos:',
+      '',
+      ...demos.map(
+        page => `- [${pageToTitle(page)}](${HOST}${rewriteUrlForNextExport(page.pathname)})`,
+      ),
+      '',
+    );
+  }
+
+  markdownLines.push('API:', '', `- [${api.name} API](${HOST}/api/${kebabCase(api.name)}/)`);
+  if (api.inheritance !== null) {
+    markdownLines.push(`- inherits ${inheritanceAPILink}`);
+  }
+
+  const jsdoc = `/**\n${markdownLines
+    .map(line => (line.length > 0 ? ` * ${line}` : ` *`))
+    .join('\n')}\n */`;
+  const typesSourceNew = typesSource.slice(0, start) + jsdoc + typesSource.slice(end);
+  writeFileSync(typesFilename, typesSourceNew, { encoding: 'utf8' });
+}
+
 async function buildDocs(options) {
   const { component: componentObject, pagesMarkdown } = options;
   const src = readFileSync(componentObject.filename, 'utf8');
@@ -209,6 +333,8 @@ export default function Page() {
 
     console.log('Built markdown docs for', reactAPI.name);
   });
+
+  await annotateComponentDefinition(componentObject, reactAPI);
 }
 
 function run() {

docs/src/pages/components/alert/alert.md

@@ -1,6 +1,6 @@
 ---
 title: Alert React component
-components: Alert
+components: Alert, AlertTitle
 ---
 
 # Alert

package.json

@@ -127,6 +127,7 @@
     "react": "^16.13.0",
     "react-dom": "^16.13.0",
     "react-test-renderer": "^16.13.0",
+    "remark": "^11.0.2",
     "rimraf": "^3.0.0",
     "rollup": "^1.21.4",
     "rollup-plugin-babel": "^4.3.3",
@@ -141,6 +142,7 @@
     "tslint": "5.14.0",
     "typescript": "^3.8.2",
     "typescript-to-proptypes": "^1.4.0",
+    "unist-util-visit": "^2.0.2",
     "vrtest-mui": "^0.3.3",
     "webpack": "^4.41.0",
     "webpack-cli": "^3.3.9",

packages/material-ui-lab/src/Alert/Alert.d.ts

@@ -70,4 +70,15 @@ export type AlertClassKey =
   | 'message'
   | 'action';
 
+/**
+ *
+ * Demos:
+ *
+ * - [Alert](https://material-ui.com/components/alert/)
+ *
+ * API:
+ *
+ * - [Alert API](https://material-ui.com/api/alert/)
+ * - inherits [Paper API](https://material-ui.com/api/paper/)
+ */
 export default function Alert(props: AlertProps): JSX.Element;

packages/material-ui-lab/src/AlertTitle/AlertTitle.d.ts

@@ -6,4 +6,14 @@ export interface AlertTitleProps
 
 export type AlertTitleClassKey = 'root';
 
+/**
+ *
+ * Demos:
+ *
+ * - [Alert](https://material-ui.com/components/alert/)
+ *
+ * API:
+ *
+ * - [AlertTitle API](https://material-ui.com/api/alert-title/)
+ */
 export default function AlertTitle(props: AlertTitleProps): JSX.Element;

packages/material-ui-lab/src/Autocomplete/Autocomplete.d.ts

@@ -184,6 +184,16 @@ export type AutocompleteClassKey =
   | 'groupLabel'
   | 'groupUl';
 
+/**
+ *
+ * Demos:
+ *
+ * - [Autocomplete](https://material-ui.com/components/autocomplete/)
+ *
+ * API:
+ *
+ * - [Autocomplete API](https://material-ui.com/api/autocomplete/)
+ */
 export default function Autocomplete<T>(
   props: AutocompleteProps<T> & UseAutocompleteProps<T>,
 ): JSX.Element;

packages/material-ui-lab/src/AvatarGroup/AvatarGroup.d.ts

@@ -19,4 +19,14 @@ export interface AvatarGroupProps
 
 export type AvatarGroupClassKey = 'root' | 'avatar';
 
+/**
+ *
+ * Demos:
+ *
+ * - [Avatars](https://material-ui.com/components/avatars/)
+ *
+ * API:
+ *
+ * - [AvatarGroup API](https://material-ui.com/api/avatar-group/)
+ */
 export default function AvatarGroup(props: AvatarGroupProps): JSX.Element;

packages/material-ui-lab/src/Pagination/Pagination.d.ts

@@ -47,4 +47,14 @@ export interface PaginationProps
 
 export type PaginationClassKey = 'root' | 'ul';
 
+/**
+ *
+ * Demos:
+ *
+ * - [Pagination](https://material-ui.com/components/pagination/)
+ *
+ * API:
+ *
+ * - [Pagination API](https://material-ui.com/api/pagination/)
+ */
 export default function Pagination(props: PaginationProps): JSX.Element;

packages/material-ui-lab/src/PaginationItem/PaginationItem.d.ts

@@ -41,6 +41,16 @@ export interface PaginationItemTypeMap<P = {}, D extends React.ElementType = 'di
   classKey: PaginationItemClassKey;
 }
 
+/**
+ *
+ * Demos:
+ *
+ * - [Pagination](https://material-ui.com/components/pagination/)
+ *
+ * API:
+ *
+ * - [PaginationItem API](https://material-ui.com/api/pagination-item/)
+ */
 declare const PaginationItem: OverridableComponent<PaginationItemTypeMap>;
 
 export type PaginationItemClassKey =

packages/material-ui-lab/src/Rating/Rating.d.ts

@@ -41,6 +41,16 @@ export type RatingClassKey =
   | 'iconActive'
   | 'decimal';
 
+/**
+ *
+ * Demos:
+ *
+ * - [Rating](https://material-ui.com/components/rating/)
+ *
+ * API:
+ *
+ * - [Rating API](https://material-ui.com/api/rating/)
+ */
 declare const Rating: React.ComponentType<RatingProps>;
 
 export default Rating;

packages/material-ui-lab/src/Skeleton/Skeleton.d.ts

@@ -12,6 +12,16 @@ export interface SkeletonTypeMap<P = {}, D extends React.ElementType = 'span'> {
   classKey: SkeletonClassKey;
 }
 
+/**
+ *
+ * Demos:
+ *
+ * - [Skeleton](https://material-ui.com/components/skeleton/)
+ *
+ * API:
+ *
+ * - [Skeleton API](https://material-ui.com/api/skeleton/)
+ */
 declare const Skeleton: OverridableComponent<SkeletonTypeMap>;
 
 export type SkeletonClassKey = 'root' | 'text' | 'rect' | 'circle' | 'pulse' | 'wave';

packages/material-ui-lab/src/SpeedDial/SpeedDial.d.ts

@@ -87,4 +87,14 @@ export type SpeedDialClassKey =
   | 'actions'
   | 'actionsClosed';
 
+/**
+ *
+ * Demos:
+ *
+ * - [Speed Dial](https://material-ui.com/components/speed-dial/)
+ *
+ * API:
+ *
+ * - [SpeedDial API](https://material-ui.com/api/speed-dial/)
+ */
 export default function SpeedDial(props: SpeedDialProps): JSX.Element;

packages/material-ui-lab/src/SpeedDialAction/SpeedDialAction.d.ts

@@ -43,4 +43,15 @@ export type SpeedDialActionClassKey =
   | 'staticTooltipLabel'
   | 'tooltipPlacementLeft';
 
+/**
+ *
+ * Demos:
+ *
+ * - [Speed Dial](https://material-ui.com/components/speed-dial/)
+ *
+ * API:
+ *
+ * - [SpeedDialAction API](https://material-ui.com/api/speed-dial-action/)
+ * - inherits [Tooltip API](https://material-ui.com/api/tooltip/)
+ */
 export default function SpeedDialAction(props: SpeedDialActionProps): JSX.Element;

packages/material-ui-lab/src/SpeedDialIcon/SpeedDialIcon.d.ts

@@ -26,4 +26,14 @@ export type SpeedDialIconClassKey =
   | 'openIcon'
   | 'openIconOpen';
 
+/**
+ *
+ * Demos:
+ *
+ * - [Speed Dial](https://material-ui.com/components/speed-dial/)
+ *
+ * API:
+ *
+ * - [SpeedDialIcon API](https://material-ui.com/api/speed-dial-icon/)
+ */
 export default function SpeedDialIcon(props: SpeedDialIconProps): JSX.Element;

packages/material-ui-lab/src/ToggleButton/ToggleButton.d.ts

@@ -19,6 +19,17 @@ export type ToggleButtonTypeMap<
   classKey: ToggleButtonClassKey;
 }>;
 
+/**
+ *
+ * Demos:
+ *
+ * - [Toggle Button](https://material-ui.com/components/toggle-button/)
+ *
+ * API:
+ *
+ * - [ToggleButton API](https://material-ui.com/api/toggle-button/)
+ * - inherits [ButtonBase API](https://material-ui.com/api/button-base/)
+ */
 declare const ToggleButton: ExtendButtonBase<ToggleButtonTypeMap>;
 
 export type ToggleButtonProps<