refactor: split DocSidebarItem by item type (#7005)

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

@@ -134,6 +134,8 @@ declare module '@docusaurus/plugin-content-docs' {
 
   export type PropSidebarItemLink =
     import('./sidebars/types').PropSidebarItemLink;
+  export type PropSidebarItemHtml =
+    import('./sidebars/types').PropSidebarItemHtml;
   export type PropSidebarItemCategory =
     import('./sidebars/types').PropSidebarItemCategory;
   export type PropSidebarItem = import('./sidebars/types').PropSidebarItem;

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

@@ -235,6 +235,40 @@ declare module '@theme/DocSidebarItem' {
   export default function DocSidebarItem(props: Props): JSX.Element;
 }
 
+declare module '@theme/DocSidebarItem/Link' {
+  import type {Props as DocSidebarItemProps} from '@theme/DocSidebarItem';
+
+  import type {PropSidebarItemLink} from '@docusaurus/plugin-content-docs';
+
+  export interface Props extends DocSidebarItemProps {
+    item: PropSidebarItemLink;
+  }
+
+  export default function DocSidebarItemLink(props: Props): JSX.Element;
+}
+
+declare module '@theme/DocSidebarItem/Html' {
+  import type {Props as DocSidebarItemProps} from '@theme/DocSidebarItem';
+  import type {PropSidebarItemHtml} from '@docusaurus/plugin-content-docs';
+
+  export interface Props extends DocSidebarItemProps {
+    item: PropSidebarItemHtml;
+  }
+
+  export default function DocSidebarItemHtml(props: Props): JSX.Element;
+}
+
+declare module '@theme/DocSidebarItem/Category' {
+  import type {Props as DocSidebarItemProps} from '@theme/DocSidebarItem';
+  import type {PropSidebarItemCategory} from '@docusaurus/plugin-content-docs';
+
+  export interface Props extends DocSidebarItemProps {
+    item: PropSidebarItemCategory;
+  }
+
+  export default function DocSidebarItemCategory(props: Props): JSX.Element;
+}
+
 declare module '@theme/DocSidebarItems' {
   import type {Props as DocSidebarItemProps} from '@theme/DocSidebarItem';
   import type {PropSidebarItem} from '@docusaurus/plugin-content-docs';

packages/docusaurus-theme-classic/src/theme/DocSidebarItem/Category.tsx

@@ -0,0 +1,212 @@
+/**
+ * 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, useEffect, useMemo} from 'react';
+import clsx from 'clsx';
+import {
+  isActiveSidebarItem,
+  usePrevious,
+  Collapsible,
+  useCollapsible,
+  findFirstCategoryLink,
+  ThemeClassNames,
+  useThemeConfig,
+  useDocSidebarItemsExpandedState,
+  isSamePath,
+} from '@docusaurus/theme-common';
+import Link from '@docusaurus/Link';
+import {translate} from '@docusaurus/Translate';
+
+import DocSidebarItems from '@theme/DocSidebarItems';
+import type {Props} from '@theme/DocSidebarItem/Category';
+
+import useIsBrowser from '@docusaurus/useIsBrowser';
+
+// If we navigate to a category and it becomes active, it should automatically
+// expand itself
+function useAutoExpandActiveCategory({
+  isActive,
+  collapsed,
+  setCollapsed,
+}: {
+  isActive: boolean;
+  collapsed: boolean;
+  setCollapsed: (b: boolean) => void;
+}) {
+  const wasActive = usePrevious(isActive);
+  useEffect(() => {
+    const justBecameActive = isActive && !wasActive;
+    if (justBecameActive && collapsed) {
+      setCollapsed(false);
+    }
+  }, [isActive, wasActive, collapsed, setCollapsed]);
+}
+
+/**
+ * When a collapsible category has no link, we still link it to its first child
+ * during SSR as a temporary fallback. This allows to be able to navigate inside
+ * the category even when JS fails to load, is delayed or simply disabled
+ * React hydration becomes an optional progressive enhancement
+ * see https://github.com/facebookincubator/infima/issues/36#issuecomment-772543188
+ * see https://github.com/facebook/docusaurus/issues/3030
+ */
+function useCategoryHrefWithSSRFallback(
+  item: Props['item'],
+): string | undefined {
+  const isBrowser = useIsBrowser();
+  return useMemo(() => {
+    if (item.href) {
+      return item.href;
+    }
+    // In these cases, it's not necessary to render a fallback
+    // We skip the "findFirstCategoryLink" computation
+    if (isBrowser || !item.collapsible) {
+      return undefined;
+    }
+    return findFirstCategoryLink(item);
+  }, [item, isBrowser]);
+}
+
+function CollapseButton({
+  categoryLabel,
+  onClick,
+}: {
+  categoryLabel: string;
+  onClick: ComponentProps<'button'>['onClick'];
+}) {
+  return (
+    <button
+      aria-label={translate(
+        {
+          id: 'theme.DocSidebarItem.toggleCollapsedCategoryAriaLabel',
+          message: "Toggle the collapsible sidebar category '{label}'",
+          description:
+            'The ARIA label to toggle the collapsible sidebar category',
+        },
+        {label: categoryLabel},
+      )}
+      type="button"
+      className="clean-btn menu__caret"
+      onClick={onClick}
+    />
+  );
+}
+
+export default function DocSidebarItemCategory({
+  item,
+  onItemClick,
+  activePath,
+  level,
+  index,
+  ...props
+}: Props): JSX.Element {
+  const {items, label, collapsible, className, href} = item;
+  const hrefWithSSRFallback = useCategoryHrefWithSSRFallback(item);
+
+  const isActive = isActiveSidebarItem(item, activePath);
+  const isCurrentPage = isSamePath(href, activePath);
+
+  const {collapsed, setCollapsed} = useCollapsible({
+    // active categories are always initialized as expanded
+    // the default (item.collapsed) is only used for non-active categories
+    initialState: () => {
+      if (!collapsible) {
+        return false;
+      }
+      return isActive ? false : item.collapsed;
+    },
+  });
+
+  useAutoExpandActiveCategory({isActive, collapsed, setCollapsed});
+  const {expandedItem, setExpandedItem} = useDocSidebarItemsExpandedState();
+  function updateCollapsed(toCollapsed: boolean = !collapsed) {
+    setExpandedItem(toCollapsed ? null : index);
+    setCollapsed(toCollapsed);
+  }
+  const {autoCollapseSidebarCategories} = useThemeConfig();
+  useEffect(() => {
+    if (
+      collapsible &&
+      expandedItem &&
+      expandedItem !== index &&
+      autoCollapseSidebarCategories
+    ) {
+      setCollapsed(true);
+    }
+  }, [
+    collapsible,
+    expandedItem,
+    index,
+    setCollapsed,
+    autoCollapseSidebarCategories,
+  ]);
+
+  return (
+    <li
+      className={clsx(
+        ThemeClassNames.docs.docSidebarItemCategory,
+        ThemeClassNames.docs.docSidebarItemCategoryLevel(level),
+        'menu__list-item',
+        {
+          'menu__list-item--collapsed': collapsed,
+        },
+        className,
+      )}>
+      <div
+        className={clsx('menu__list-item-collapsible', {
+          'menu__list-item-collapsible--active': isCurrentPage,
+        })}>
+        <Link
+          className={clsx('menu__link', {
+            'menu__link--sublist': collapsible,
+            'menu__link--sublist-caret': !href,
+            'menu__link--active': isActive,
+          })}
+          onClick={
+            collapsible
+              ? (e) => {
+                  onItemClick?.(item);
+                  if (href) {
+                    updateCollapsed(false);
+                  } else {
+                    e.preventDefault();
+                    updateCollapsed();
+                  }
+                }
+              : () => {
+                  onItemClick?.(item);
+                }
+          }
+          aria-current={isCurrentPage ? 'page' : undefined}
+          aria-expanded={collapsible ? !collapsed : undefined}
+          href={collapsible ? hrefWithSSRFallback ?? '#' : hrefWithSSRFallback}
+          {...props}>
+          {label}
+        </Link>
+        {href && collapsible && (
+          <CollapseButton
+            categoryLabel={label}
+            onClick={(e) => {
+              e.preventDefault();
+              updateCollapsed();
+            }}
+          />
+        )}
+      </div>
+
+      <Collapsible lazy as="ul" className="menu__list" collapsed={collapsed}>
+        <DocSidebarItems
+          items={items}
+          tabIndex={collapsed ? -1 : 0}
+          onItemClick={onItemClick}
+          activePath={activePath}
+          level={level + 1}
+        />
+      </Collapsible>
+    </li>
+  );
+}

packages/docusaurus-theme-classic/src/theme/DocSidebarItem/styles.module.css → packages/docusaurus-theme-classic/src/theme/DocSidebarItem/Html.module.css

@@ -11,7 +11,3 @@
       var(--ifm-menu-link-padding-horizontal);
   }
 }
-
-.menuExternalLink {
-  align-items: center;
-}

packages/docusaurus-theme-classic/src/theme/DocSidebarItem/Html.tsx

@@ -0,0 +1,34 @@
+/**
+ * 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 {ThemeClassNames} from '@docusaurus/theme-common';
+import type {Props} from '@theme/DocSidebarItem/Html';
+
+import styles from './Html.module.css';
+
+export default function DocSidebarItemHtml({
+  item,
+  level,
+  index,
+}: Props): JSX.Element {
+  const {value, defaultStyle, className} = item;
+  return (
+    <li
+      className={clsx(
+        ThemeClassNames.docs.docSidebarItemLink,
+        ThemeClassNames.docs.docSidebarItemLinkLevel(level),
+        defaultStyle && `${styles.menuHtmlItem} menu__list-item`,
+        className,
+      )}
+      key={index}
+      // eslint-disable-next-line react/no-danger
+      dangerouslySetInnerHTML={{__html: value}}
+    />
+  );
+}

packages/docusaurus-theme-classic/src/theme/DocSidebarItem/Link.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.
+ */
+
+.menuExternalLink {
+  align-items: center;
+}

packages/docusaurus-theme-classic/src/theme/DocSidebarItem/Link.tsx

@@ -0,0 +1,58 @@
+/**
+ * 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 {isActiveSidebarItem, ThemeClassNames} from '@docusaurus/theme-common';
+import Link from '@docusaurus/Link';
+import isInternalUrl from '@docusaurus/isInternalUrl';
+import IconExternalLink from '@theme/IconExternalLink';
+
+import type {Props} from '@theme/DocSidebarItem/Link';
+
+import styles from './Link.module.css';
+
+export default function DocSidebarItemLink({
+  item,
+  onItemClick,
+  activePath,
+  level,
+  index,
+  ...props
+}: Props): JSX.Element {
+  const {href, label, className} = item;
+  const isActive = isActiveSidebarItem(item, activePath);
+  const isInternalLink = isInternalUrl(href);
+  return (
+    <li
+      className={clsx(
+        ThemeClassNames.docs.docSidebarItemLink,
+        ThemeClassNames.docs.docSidebarItemLinkLevel(level),
+        'menu__list-item',
+        className,
+      )}
+      key={label}>
+      <Link
+        className={clsx(
+          'menu__link',
+          !isInternalLink && styles.menuExternalLink,
+          {
+            'menu__link--active': isActive,
+          },
+        )}
+        aria-current={isActive ? 'page' : undefined}
+        to={href}
+        {...(isInternalLink && {
+          onClick: onItemClick ? () => onItemClick(item) : undefined,
+        })}
+        {...props}>
+        {label}
+        {!isInternalLink && <IconExternalLink />}
+      </Link>
+    </li>
+  );
+}