refactor(theme): use JSON-LD instead of microdata for blog structured data

packages/docusaurus-plugin-content-blog/package.json

@@ -4,9 +4,21 @@
   "description": "Blog plugin for Docusaurus.",
   "main": "lib/index.js",
   "types": "src/plugin-content-blog.d.ts",
+  "exports": {
+    "./lib/*": "./lib/*",
+    "./src/*": "./src/*",
+    "./client": {
+      "type": "./lib/client/index.d.ts",
+      "default": "./lib/client/index.js"
+    },
+    ".": {
+      "types": "./src/plugin-content-blog.d.ts",
+      "default": "./lib/index.js"
+    }
+  },
   "scripts": {
-    "build": "tsc",
-    "watch": "tsc --watch",
+    "build": "tsc --build",
+    "watch": "tsc --build --watch",
     "test:generate-build-snap": "yarn docusaurus build src/__tests__/__fixtures__/website --out-dir build-snap && yarn rimraf src/__tests__/__fixtures__/website/.docusaurus && yarn rimraf src/__tests__/__fixtures__/website/build-snap/assets && git add src/__tests__/__fixtures__/website/build-snap"
   },
   "repository": {

packages/docusaurus-plugin-content-blog/src/client/index.ts

@@ -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 useRouteContext from '@docusaurus/useRouteContext';
+import type {BlogMetadata} from '@docusaurus/plugin-content-blog';
+
+export function useBlogMetadata(): BlogMetadata {
+  const routeContext = useRouteContext();
+  const blogMetadata = routeContext?.data?.blogMetadata;
+  if (!blogMetadata) {
+    throw new Error(
+      "useBlogMetadata() can't be called on the current route because the blog metadata could not be found in route context",
+    );
+  }
+  return blogMetadata as BlogMetadata;
+}

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

@@ -42,6 +42,7 @@ import type {
   BlogTags,
   BlogContent,
   BlogPaginated,
+  BlogMetadata,
 } from '@docusaurus/plugin-content-blog';
 
 export default async function pluginContentBlog(
@@ -180,6 +181,7 @@ export default async function pluginContentBlog(
         blogArchiveComponent,
         routeBasePath,
         archiveBasePath,
+        blogTitle,
       } = options;
 
       const {addRoute, createData} = actions;
@@ -255,6 +257,15 @@ export default async function pluginContentBlog(
         ),
       );
 
+      const blogMetadata: BlogMetadata = {
+        blogBasePath: normalizeUrl([baseUrl, routeBasePath]),
+        blogTitle,
+      };
+      const blogMetadataPath = await createData(
+        `blogMetadata-${pluginId}.json`,
+        JSON.stringify(blogMetadata, null, 2),
+      );
+
       // Create routes for blog entries.
       await Promise.all(
         blogPosts.map(async (blogPost) => {
@@ -274,6 +285,9 @@ export default async function pluginContentBlog(
               sidebar: aliasedSource(sidebarProp),
               content: metadata.source,
             },
+            context: {
+              blogMetadata: aliasedSource(blogMetadataPath),
+            },
           });
 
           blogItemsToMetadata[id] = metadata;

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

@@ -5,6 +5,8 @@
  * LICENSE file in the root directory of this source tree.
  */
 
+/// <reference types="@docusaurus/module-type-aliases" />
+
 declare module '@docusaurus/plugin-content-blog' {
   import type {LoadedMDXContent} from '@docusaurus/mdx-loader';
   import type {MDXOptions} from '@docusaurus/mdx-loader';
@@ -461,6 +463,13 @@ yarn workspace v1.22.19image` is a collocated image path, this entry will be the
     blogTagsListPath: string;
   };
 
+  export type BlogMetadata = {
+    /** the path to the base of the blog */
+    blogBasePath: string;
+    /** title of the overall blog */
+    blogTitle: string;
+  };
+
   export type BlogTags = {
     [permalink: string]: BlogTag;
   };
@@ -532,6 +541,7 @@ declare module '@theme/BlogPostPage' {
     BlogPostFrontMatter,
     BlogSidebar,
     PropBlogPostContent,
+    BlogMetadata,
   } from '@docusaurus/plugin-content-blog';
 
   export type FrontMatter = BlogPostFrontMatter;
@@ -543,6 +553,8 @@ declare module '@theme/BlogPostPage' {
     readonly sidebar: BlogSidebar;
     /** Content of this post as an MDX component, with useful metadata. */
     readonly content: Content;
+    /** Metadata about the blog. */
+    readonly blogMetadata: BlogMetadata;
   }
 
   export default function BlogPostPage(props: Props): JSX.Element;
@@ -552,6 +564,10 @@ declare module '@theme/BlogPostPage/Metadata' {
   export default function BlogPostPageMetadata(): JSX.Element;
 }
 
+declare module '@theme/BlogPostPage/StructuredData' {
+  export default function BlogPostStructuredData(): JSX.Element;
+}
+
 declare module '@theme/BlogListPage' {
   import type {Content} from '@theme/BlogPostPage';
   import type {
@@ -574,6 +590,28 @@ declare module '@theme/BlogListPage' {
   export default function BlogListPage(props: Props): JSX.Element;
 }
 
+declare module '@theme/BlogListPage/StructuredData' {
+  import type {Content} from '@theme/BlogPostPage';
+  import type {
+    BlogSidebar,
+    BlogPaginatedMetadata,
+  } from '@docusaurus/plugin-content-blog';
+
+  export interface Props {
+    /** Blog sidebar. */
+    readonly sidebar: BlogSidebar;
+    /** Metadata of the current listing page. */
+    readonly metadata: BlogPaginatedMetadata;
+    /**
+     * Array of blog posts included on this page. Every post's metadata is also
+     * available.
+     */
+    readonly items: readonly {readonly content: Content}[];
+  }
+
+  export default function BlogListPageStructuredData(props: Props): JSX.Element;
+}
+
 declare module '@theme/BlogTagsListPage' {
   import type {BlogSidebar} from '@docusaurus/plugin-content-blog';
   import type {TagsListItem} from '@docusaurus/utils';

packages/docusaurus-plugin-content-blog/tsconfig.client.json

@@ -0,0 +1,16 @@
+{
+  "extends": "../../tsconfig.json",
+  "compilerOptions": {
+    "noEmit": false,
+    "composite": true,
+    "incremental": true,
+    "tsBuildInfoFile": "./lib/.tsbuildinfo-client",
+    "moduleResolution": "bundler",
+    "module": "esnext",
+    "target": "esnext",
+    "rootDir": "src",
+    "outDir": "lib"
+  },
+  "include": ["src/client", "src/*.d.ts"],
+  "exclude": ["**/__tests__/**"]
+}

packages/docusaurus-plugin-content-blog/tsconfig.json

@@ -1,5 +1,6 @@
 {
   "extends": "../../tsconfig.json",
+  "references": [{"path": "./tsconfig.client.json"}],
   "compilerOptions": {
     "noEmit": false,
     "incremental": true,
@@ -8,5 +9,5 @@
     "outDir": "lib"
   },
   "include": ["src"],
-  "exclude": ["**/__tests__/**"]
+  "exclude": ["src/client", "**/__tests__/**"]
 }

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

@@ -25,9 +25,7 @@ export default function BlogLayout(props: Props): JSX.Element {
             className={clsx('col', {
               'col--7': hasSidebar,
               'col--9 col--offset-1': !hasSidebar,
-            })}
-            itemScope
-            itemType="https://schema.org/Blog">
+            })}>
             {children}
           </main>
           {toc && <div className="col col--2">{toc}</div>}

packages/docusaurus-theme-classic/src/theme/BlogListPage/StructuredData/index.tsx

@@ -0,0 +1,22 @@
+/**
+ * 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 Head from '@docusaurus/Head';
+import {useBlogListPageStructuredData} from '@docusaurus/theme-common';
+import type {Props} from '@theme/BlogListPage/StructuredData';
+
+export default function BlogListPageStructuredData(props: Props): JSX.Element {
+  const structuredData = useBlogListPageStructuredData(props);
+  return (
+    <Head>
+      <script type="application/ld+json">
+        {JSON.stringify(structuredData)}
+      </script>
+    </Head>
+  );
+}

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

@@ -19,6 +19,7 @@ import BlogListPaginator from '@theme/BlogListPaginator';
 import SearchMetadata from '@theme/SearchMetadata';
 import type {Props} from '@theme/BlogListPage';
 import BlogPostItems from '@theme/BlogPostItems';
+import BlogListPageStructuredData from '@theme/BlogListPage/StructuredData';
 
 function BlogListPageMetadata(props: Props): JSX.Element {
   const {metadata} = props;
@@ -54,6 +55,7 @@ export default function BlogListPage(props: Props): JSX.Element {
         ThemeClassNames.page.blogListPage,
       )}>
       <BlogListPageMetadata {...props} />
+      <BlogListPageStructuredData {...props} />
       <BlogListPageContent {...props} />
     </HtmlClassNameProvider>
   );

packages/docusaurus-theme-classic/src/theme/BlogPostItem/Container/index.tsx

@@ -6,36 +6,11 @@
  */
 
 import React from 'react';
-import {useBaseUrlUtils} from '@docusaurus/useBaseUrl';
-import {useBlogPost} from '@docusaurus/theme-common/internal';
 import type {Props} from '@theme/BlogPostItem/Container';
 
 export default function BlogPostItemContainer({
   children,
   className,
 }: Props): JSX.Element {
-  const {
-    frontMatter,
-    assets,
-    metadata: {description},
-  } = useBlogPost();
-  const {withBaseUrl} = useBaseUrlUtils();
-  const image = assets.image ?? frontMatter.image;
-  const keywords = frontMatter.keywords ?? [];
-  return (
-    <article
-      className={className}
-      itemProp="blogPost"
-      itemScope
-      itemType="https://schema.org/BlogPosting">
-      {description && <meta itemProp="description" content={description} />}
-      {image && (
-        <link itemProp="image" href={withBaseUrl(image, {absolute: true})} />
-      )}
-      {keywords.length > 0 && (
-        <meta itemProp="keywords" content={keywords.join(',')} />
-      )}
-      {children}
-    </article>
-  );
+  return <article className={className}>{children}</article>;
 }

packages/docusaurus-theme-classic/src/theme/BlogPostItem/Content/index.tsx

@@ -21,8 +21,7 @@ export default function BlogPostItemContent({
     <div
       // This ID is used for the feed generation to locate the main content
       id={isBlogPostPage ? blogPostContainerID : undefined}
-      className={clsx('markdown', className)}
-      itemProp="articleBody">
+      className={clsx('markdown', className)}>
       <MDXContent>{children}</MDXContent>
     </div>
   );

packages/docusaurus-theme-classic/src/theme/BlogPostItem/Header/Author/index.tsx

@@ -28,31 +28,18 @@ export default function BlogPostItemHeaderAuthor({
     <div className={clsx('avatar margin-bottom--sm', className)}>
       {imageURL && (
         <MaybeLink href={link} className="avatar__photo-link">
-          <img
-            className="avatar__photo"
-            src={imageURL}
-            alt={name}
-            itemProp="image"
-          />
+          <img className="avatar__photo" src={imageURL} alt={name} />
         </MaybeLink>
       )}
 
       {name && (
-        <div
-          className="avatar__intro"
-          itemProp="author"
-          itemScope
-          itemType="https://schema.org/Person">
+        <div className="avatar__intro">
           <div className="avatar__name">
-            <MaybeLink href={link} itemProp="url">
-              <span itemProp="name">{name}</span>
+            <MaybeLink href={link}>
+              <span>{name}</span>
             </MaybeLink>
           </div>
-          {title && (
-            <small className="avatar__subtitle" itemProp="description">
-              {title}
-            </small>
-          )}
+          {title && <small className="avatar__subtitle">{title}</small>}
         </div>
       )}
     </div>

packages/docusaurus-theme-classic/src/theme/BlogPostItem/Header/Info/index.tsx

@@ -40,11 +40,7 @@ function ReadingTime({readingTime}: {readingTime: number}) {
 }
 
 function Date({date, formattedDate}: {date: string; formattedDate: string}) {
-  return (
-    <time dateTime={date} itemProp="datePublished">
-      {formattedDate}
-    </time>
-  );
+  return <time dateTime={date}>{formattedDate}</time>;
 }
 
 function Spacer() {

packages/docusaurus-theme-classic/src/theme/BlogPostItem/Header/Title/index.tsx

@@ -20,14 +20,8 @@ export default function BlogPostItemHeaderTitle({
   const {permalink, title} = metadata;
   const TitleHeading = isBlogPostPage ? 'h1' : 'h2';
   return (
-    <TitleHeading className={clsx(styles.title, className)} itemProp="headline">
-      {isBlogPostPage ? (
-        title
-      ) : (
-        <Link itemProp="url" to={permalink}>
-          {title}
-        </Link>
-      )}
+    <TitleHeading className={clsx(styles.title, className)}>
+      {isBlogPostPage ? title : <Link to={permalink}>{title}</Link>}
     </TitleHeading>
   );
 }

packages/docusaurus-theme-classic/src/theme/BlogPostPage/StructuredData/index.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 from 'react';
+import Head from '@docusaurus/Head';
+import {useBlogPostStructuredData} from '@docusaurus/theme-common';
+
+export default function BlogPostStructuredData(): JSX.Element {
+  const structuredData = useBlogPostStructuredData();
+  return (
+    <Head>
+      <script type="application/ld+json">
+        {JSON.stringify(structuredData)}
+      </script>
+    </Head>
+  );
+}