refactor(docs): theme-common shouldn't depend on docs content (#10316)

packages/docusaurus-theme-common/src/contexts/docSidebarItemsExpandedState.tsx

@@ -1,55 +0,0 @@
-/**
- * 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 ReactNode, useMemo, useState, useContext} from 'react';
-import {ReactContextError} from '../utils/reactUtils';
-
-type ContextValue = {
-  /**
-   * The item that the user last opened, `null` when there's none open. On
-   * initial render, it will always be `null`, which doesn't necessarily mean
-   * there's no category open (can have 0, 1, or many being initially open).
-   */
-  expandedItem: number | null;
-  /**
-   * Set the currently expanded item, when the user opens one. Set the value to
-   * `null` when the user closes an open category.
-   */
-  setExpandedItem: (a: number | null) => void;
-};
-
-const EmptyContext: unique symbol = Symbol('EmptyContext');
-const Context = React.createContext<ContextValue | typeof EmptyContext>(
-  EmptyContext,
-);
-
-/**
- * Should be used to wrap one sidebar category level. This provider syncs the
- * expanded states of all sibling categories, and categories can choose to
- * collapse itself if another one is expanded.
- */
-export function DocSidebarItemsExpandedStateProvider({
-  children,
-}: {
-  children: ReactNode;
-}): JSX.Element {
-  const [expandedItem, setExpandedItem] = useState<number | null>(null);
-  const contextValue = useMemo(
-    () => ({expandedItem, setExpandedItem}),
-    [expandedItem],
-  );
-
-  return <Context.Provider value={contextValue}>{children}</Context.Provider>;
-}
-
-export function useDocSidebarItemsExpandedState(): ContextValue {
-  const value = useContext(Context);
-  if (value === EmptyContext) {
-    throw new ReactContextError('DocSidebarItemsExpandedStateProvider');
-  }
-  return value;
-}