refactor(theme-{classic,common}): refactor site/page/search metadata + apply className on html element

packages/docusaurus-module-type-aliases/src/index.d.ts

@@ -92,8 +92,6 @@ declare module '@theme/Layout' {
 
   export interface Props {
     readonly children?: ReactNode;
-    readonly title?: string;
-    readonly description?: string;
   }
   export default function Layout(props: Props): JSX.Element;
 }
@@ -117,6 +115,10 @@ declare module '@theme/Root' {
   export default function Root({children}: Props): JSX.Element;
 }
 
+declare module '@theme/SiteMetadata' {
+  export default function SiteMetadata(): JSX.Element;
+}
+
 declare module '@docusaurus/constants' {
   export const DEFAULT_PLUGIN_ID: 'default';
 }

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

@@ -364,31 +364,17 @@ declare module '@theme/Layout' {
 
   export interface Props {
     readonly children?: ReactNode;
-    readonly title?: string;
     readonly noFooter?: boolean;
-    readonly description?: string;
-    readonly image?: string;
-    readonly keywords?: string | string[];
-    readonly permalink?: string;
     readonly wrapperClassName?: string;
-    readonly pageClassName?: string;
-    readonly searchMetadata?: {
-      readonly version?: string;
-      readonly tag?: string;
-    };
+
+    // Not really layout-related, but kept for convenience/retro-compatibility
+    readonly title?: string;
+    readonly description?: string;
   }
 
   export default function Layout(props: Props): JSX.Element;
 }
 
-declare module '@theme/LayoutHead' {
-  import type {Props as LayoutProps} from '@theme/Layout';
-
-  export interface Props extends Omit<LayoutProps, 'children'> {}
-
-  export default function LayoutHead(props: Props): JSX.Element;
-}
-
 declare module '@theme/LayoutProviders' {
   import type {ReactNode} from 'react';
 
@@ -480,7 +466,7 @@ declare module '@theme/Navbar/Content' {
 
 declare module '@theme/Navbar/Layout' {
   export interface Props {
-    children: React.ReactNode;
+    readonly children: React.ReactNode;
   }
 
   export default function NavbarLayout(props: Props): JSX.Element;
@@ -927,17 +913,3 @@ declare module '@theme/prism-include-languages' {
     PrismObject: typeof PrismNamespace,
   ): void;
 }
-
-declare module '@theme/Seo' {
-  import type {ReactNode} from 'react';
-
-  export interface Props {
-    readonly title?: string;
-    readonly description?: string;
-    readonly keywords?: readonly string[] | string;
-    readonly image?: string;
-    readonly children?: ReactNode;
-  }
-
-  export default function Seo(props: Props): JSX.Element;
-}

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

@@ -10,6 +10,7 @@ import Layout from '@theme/Layout';
 import Link from '@docusaurus/Link';
 import type {ArchiveBlogPost, Props} from '@theme/BlogArchivePage';
 import {translate} from '@docusaurus/Translate';
+import {PageMetadata} from '@docusaurus/theme-common';
 
 type YearProp = {
   year: string;
@@ -75,14 +76,17 @@ export default function BlogArchive({archive}: Props): JSX.Element {
   });
   const years = listPostsByYears(archive.blogPosts);
   return (
-    <Layout title={title} description={description}>
-      <header className="hero hero--primary">
-        <div className="container">
-          <h1 className="hero__title">{title}</h1>
-          <p className="hero__subtitle">{description}</p>
-        </div>
-      </header>
-      <main>{years.length > 0 && <YearsSection years={years} />}</main>
-    </Layout>
+    <>
+      <PageMetadata title={title} description={description} />
+      <Layout>
+        <header className="hero hero--primary">
+          <div className="container">
+            <h1 className="hero__title">{title}</h1>
+            <p className="hero__subtitle">{description}</p>
+          </div>
+        </header>
+        <main>{years.length > 0 && <YearsSection years={years} />}</main>
+      </Layout>
+    </>
   );
 }

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

@@ -12,28 +12,34 @@ import BlogLayout from '@theme/BlogLayout';
 import BlogPostItem from '@theme/BlogPostItem';
 import BlogListPaginator from '@theme/BlogListPaginator';
 import type {Props} from '@theme/BlogListPage';
-import {ThemeClassNames} from '@docusaurus/theme-common';
+import {
+  PageMetadata,
+  HtmlClassNameProvider,
+  ThemeClassNames,
+} from '@docusaurus/theme-common';
+import SearchMetadata from '@theme/SearchMetadata';
+import clsx from 'clsx';
 
-export default function BlogListPage(props: Props): JSX.Element {
-  const {metadata, items, sidebar} = props;
+function BlogListPageMetadata(props: Props): JSX.Element {
+  const {metadata} = props;
   const {
     siteConfig: {title: siteTitle},
   } = useDocusaurusContext();
   const {blogDescription, blogTitle, permalink} = metadata;
   const isBlogOnlyMode = permalink === '/';
   const title = isBlogOnlyMode ? siteTitle : blogTitle;
+  return (
+    <>
+      <PageMetadata title={title} description={blogDescription} />
+      <SearchMetadata tag="blog_posts_list" />
+    </>
+  );
+}
 
+function BlogListPageContent(props: Props): JSX.Element {
+  const {metadata, items, sidebar} = props;
   return (
-    <BlogLayout
-      title={title}
-      description={blogDescription}
-      wrapperClassName={ThemeClassNames.wrapper.blogPages}
-      pageClassName={ThemeClassNames.page.blogListPage}
-      searchMetadata={{
-        // assign unique search tag to exclude this page from search results!
-        tag: 'blog_posts_list',
-      }}
-      sidebar={sidebar}>
+    <BlogLayout sidebar={sidebar}>
       {items.map(({content: BlogPostContent}) => (
         <BlogPostItem
           key={BlogPostContent.metadata.permalink}
@@ -48,3 +54,16 @@ export default function BlogListPage(props: Props): JSX.Element {
     </BlogLayout>
   );
 }
+
+export default function BlogListPage(props: Props): JSX.Element {
+  return (
+    <HtmlClassNameProvider
+      className={clsx(
+        ThemeClassNames.wrapper.blogPages,
+        ThemeClassNames.page.blogListPage,
+      )}>
+      <BlogListPageMetadata {...props} />
+      <BlogListPageContent {...props} />
+    </HtmlClassNameProvider>
+  );
+}

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

@@ -6,40 +6,63 @@
  */
 
 import React from 'react';
-import Seo from '@theme/Seo';
 import BlogLayout from '@theme/BlogLayout';
 import BlogPostItem from '@theme/BlogPostItem';
 import BlogPostPaginator from '@theme/BlogPostPaginator';
 import type {Props} from '@theme/BlogPostPage';
-import {ThemeClassNames} from '@docusaurus/theme-common';
+import {
+  PageMetadata,
+  HtmlClassNameProvider,
+  ThemeClassNames,
+} from '@docusaurus/theme-common';
 import TOC from '@theme/TOC';
+import clsx from 'clsx';
 
-export default function BlogPostPage(props: Props): JSX.Element {
+function BlogPostPageMetadata(props: Props): JSX.Element {
+  const {content: BlogPostContents} = props;
+  const {assets, metadata} = BlogPostContents;
+  const {title, description, date, tags, authors, frontMatter} = metadata;
+  const {keywords} = frontMatter;
+  const image = assets.image ?? frontMatter.image;
+  return (
+    <PageMetadata
+      title={title}
+      description={description}
+      keywords={keywords}
+      image={image}>
+      <meta property="og:type" content="article" />
+      <meta property="article:published_time" content={date} />
+      {/* TODO double check those article meta array syntaxes, see https://ogp.me/#array */}
+      {authors.some((author) => author.url) && (
+        <meta
+          property="article:author"
+          content={authors
+            .map((author) => author.url)
+            .filter(Boolean)
+            .join(',')}
+        />
+      )}
+      {tags.length > 0 && (
+        <meta
+          property="article:tag"
+          content={tags.map((tag) => tag.label).join(',')}
+        />
+      )}
+    </PageMetadata>
+  );
+}
+
+function BlogPostPageContent(props: Props): JSX.Element {
   const {content: BlogPostContents, sidebar} = props;
   const {assets, metadata} = BlogPostContents;
-  const {
-    title,
-    description,
-    nextItem,
-    prevItem,
-    date,
-    tags,
-    authors,
-    frontMatter,
-  } = metadata;
+  const {nextItem, prevItem, frontMatter} = metadata;
   const {
     hide_table_of_contents: hideTableOfContents,
-    keywords,
     toc_min_heading_level: tocMinHeadingLevel,
     toc_max_heading_level: tocMaxHeadingLevel,
   } = frontMatter;
-
-  const image = assets.image ?? frontMatter.image;
-
   return (
     <BlogLayout
-      wrapperClassName={ThemeClassNames.wrapper.blogPages}
-      pageClassName={ThemeClassNames.page.blogPostPage}
       sidebar={sidebar}
       toc={
         !hideTableOfContents &&
@@ -52,35 +75,6 @@ export default function BlogPostPage(props: Props): JSX.Element {
           />
         ) : undefined
       }>
-      <Seo
-        // TODO refactor needed: it's a bit annoying but Seo MUST be inside
-        // BlogLayout, otherwise default image (set by BlogLayout) would shadow
-        // the custom blog post image
-        title={title}
-        description={description}
-        keywords={keywords}
-        image={image}>
-        <meta property="og:type" content="article" />
-        <meta property="article:published_time" content={date} />
-
-        {/* TODO double check those article meta array syntaxes, see https://ogp.me/#array */}
-        {authors.some((author) => author.url) && (
-          <meta
-            property="article:author"
-            content={authors
-              .map((author) => author.url)
-              .filter(Boolean)
-              .join(',')}
-          />
-        )}
-        {tags.length > 0 && (
-          <meta
-            property="article:tag"
-            content={tags.map((tag) => tag.label).join(',')}
-          />
-        )}
-      </Seo>
-
       <BlogPostItem
         frontMatter={frontMatter}
         assets={assets}
@@ -95,3 +89,16 @@ export default function BlogPostPage(props: Props): JSX.Element {
     </BlogLayout>
   );
 }
+
+export default function BlogPostPage(props: Props): JSX.Element {
+  return (
+    <HtmlClassNameProvider
+      className={clsx(
+        ThemeClassNames.wrapper.blogPages,
+        ThemeClassNames.page.blogPostPage,
+      )}>
+      <BlogPostPageMetadata {...props} />
+      <BlogPostPageContent {...props} />
+    </HtmlClassNameProvider>
+  );
+}

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

@@ -11,25 +11,29 @@ import BlogLayout from '@theme/BlogLayout';
 import TagsListByLetter from '@theme/TagsListByLetter';
 import type {Props} from '@theme/BlogTagsListPage';
 import {
+  PageMetadata,
+  HtmlClassNameProvider,
   ThemeClassNames,
   translateTagsPageTitle,
 } from '@docusaurus/theme-common';
+import SearchMetadata from '../SearchMetadata';
+import clsx from 'clsx';
 
 export default function BlogTagsListPage(props: Props): JSX.Element {
   const {tags, sidebar} = props;
   const title = translateTagsPageTitle();
   return (
-    <BlogLayout
-      title={title}
-      wrapperClassName={ThemeClassNames.wrapper.blogPages}
-      pageClassName={ThemeClassNames.page.blogTagsListPage}
-      searchMetadata={{
-        // assign unique search tag to exclude this page from search results!
-        tag: 'blog_tags_list',
-      }}
-      sidebar={sidebar}>
-      <h1>{title}</h1>
-      <TagsListByLetter tags={Object.values(tags)} />
-    </BlogLayout>
+    <HtmlClassNameProvider
+      className={clsx(
+        ThemeClassNames.wrapper.blogPages,
+        ThemeClassNames.page.blogTagsListPage,
+      )}>
+      <PageMetadata title={title} />
+      <SearchMetadata tag="blog_tags_list" />
+      <BlogLayout sidebar={sidebar}>
+        <h1>{title}</h1>
+        <TagsListByLetter tags={Object.values(tags)} />
+      </BlogLayout>
+    </HtmlClassNameProvider>
   );
 }