feat(core): fail-safe global data fetching

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

@@ -315,16 +315,18 @@ declare module '@docusaurus/renderRoutes' {
 }
 
 declare module '@docusaurus/useGlobalData' {
-  import type {GlobalData} from '@docusaurus/types';
+  import type {GlobalData, UseDataOptions} from '@docusaurus/types';
 
   export function useAllPluginInstancesData(
     pluginName: string,
-  ): GlobalData[string];
+    options?: UseDataOptions,
+  ): GlobalData[string] | undefined;
 
   export function usePluginData(
     pluginName: string,
     pluginId?: string,
-  ): GlobalData[string][string];
+    options?: UseDataOptions,
+  ): GlobalData[string][string] | undefined;
 
   export default function useGlobalData(): GlobalData;
 }

packages/docusaurus-plugin-content-docs/src/client/docsClientUtils.ts

@@ -11,11 +11,11 @@ import type {
   GlobalPluginData,
   GlobalVersion,
   GlobalDoc,
-  GetActivePluginOptions,
   ActivePlugin,
   ActiveDocContext,
   DocVersionSuggestions,
 } from '@docusaurus/plugin-content-docs/client';
+import type {UseDataOptions} from '@docusaurus/types';
 
 // This code is not part of the api surface, not in ./theme on purpose
 
@@ -25,7 +25,7 @@ import type {
 export function getActivePlugin(
   allPluginData: {[pluginId: string]: GlobalPluginData},
   pathname: string,
-  options: GetActivePluginOptions = {},
+  options: UseDataOptions = {},
 ): ActivePlugin | undefined {
   const activeEntry = Object.entries(allPluginData)
     // Route sorting: '/android/foo' should match '/android' instead of '/'

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

@@ -6,7 +6,10 @@
  */
 
 import {useLocation} from '@docusaurus/router';
-import useGlobalData, {usePluginData} from '@docusaurus/useGlobalData';
+import {
+  useAllPluginInstancesData,
+  usePluginData,
+} from '@docusaurus/useGlobalData';
 
 import {
   getActivePlugin,
@@ -21,33 +24,35 @@ import type {
   ActivePlugin,
   ActiveDocContext,
   DocVersionSuggestions,
-  GetActivePluginOptions,
 } from '@docusaurus/plugin-content-docs/client';
+import type {UseDataOptions} from '@docusaurus/types';
 
 // Important to use a constant object to avoid React useEffect executions etc.
 // see https://github.com/facebook/docusaurus/issues/5089
 const StableEmptyObject = {};
 
-// Not using useAllPluginInstancesData() because in blog-only mode, docs hooks
-// are still used by the theme. We need a fail-safe fallback when the docs
-// plugin is not in use
+// In blog-only mode, docs hooks are still used by the theme. We need a fail-
+// safe fallback when the docs plugin is not in use
 export const useAllDocsData = (): {[pluginId: string]: GlobalPluginData} =>
-  useGlobalData()['docusaurus-plugin-content-docs'] ?? StableEmptyObject;
+  useAllPluginInstancesData('docusaurus-plugin-content-docs') ??
+  StableEmptyObject;
 
 export const useDocsData = (pluginId: string | undefined): GlobalPluginData =>
-  usePluginData('docusaurus-plugin-content-docs', pluginId) as GlobalPluginData;
+  usePluginData('docusaurus-plugin-content-docs', pluginId, {
+    failfast: true,
+  }) as GlobalPluginData;
 
 // TODO this feature should be provided by docusaurus core
 export const useActivePlugin = (
-  options: GetActivePluginOptions = {},
+  options: UseDataOptions = {},
 ): ActivePlugin | undefined => {
   const data = useAllDocsData();
   const {pathname} = useLocation();
   return getActivePlugin(data, pathname, options);
 };
 
 export const useActivePluginAndVersion = (
-  options: GetActivePluginOptions = {},
+  options: UseDataOptions = {},
 ):
   | undefined
   | {activePlugin: ActivePlugin; activeVersion: GlobalVersion | undefined} => {

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

@@ -612,6 +612,8 @@ declare module '@theme/DocPage/Layout/Main' {
 
 // TODO until TS supports exports field... hope it's in 4.6
 declare module '@docusaurus/plugin-content-docs/client' {
+  import type {UseDataOptions} from '@docusaurus/types';
+
   export type ActivePlugin = {
     pluginId: string;
     pluginData: GlobalPluginData;
@@ -655,15 +657,14 @@ declare module '@docusaurus/plugin-content-docs/client' {
     // suggest the same doc, in latest version (if exist)
     latestDocSuggestion?: GlobalDoc;
   };
-  export type GetActivePluginOptions = {failfast?: boolean}; // use fail-fast option if you know for sure one plugin instance is active
 
   export const useAllDocsData: () => {[pluginId: string]: GlobalPluginData};
   export const useDocsData: (pluginId?: string) => GlobalPluginData;
   export const useActivePlugin: (
-    options?: GetActivePluginOptions,
+    options?: UseDataOptions,
   ) => ActivePlugin | undefined;
   export const useActivePluginAndVersion: (
-    options?: GetActivePluginOptions,
+    options?: UseDataOptions,
   ) =>
     | {activePlugin: ActivePlugin; activeVersion: GlobalVersion | undefined}
     | undefined;

packages/docusaurus-types/src/index.d.ts

@@ -619,3 +619,11 @@ export type TagModule = TagsListItem & {
   /** The tags list page's permalink. */
   allTagsPath: string;
 };
+
+export type UseDataOptions = {
+  /**
+   * Throw an error, or simply return undefined if the data cannot be found. Use
+   * `true` if you are sure the data must exist.
+   */
+  failfast?: boolean;
+};

packages/docusaurus/src/client/exports/__tests__/useGlobalData.test.tsx

@@ -59,7 +59,7 @@ describe('useAllPluginInstancesData', () => {
   it('throws when plugin data not found', () => {
     expect(
       () =>
-        renderHook(() => useAllPluginInstancesData('bar'), {
+        renderHook(() => useAllPluginInstancesData('bar', {failfast: true}), {
           wrapper: ({children}) => (
             <Context.Provider
               // eslint-disable-next-line react/jsx-no-constructed-context-values
@@ -106,7 +106,7 @@ describe('usePluginData', () => {
   it('throws when plugin instance data not found', () => {
     expect(
       () =>
-        renderHook(() => usePluginData('foo', 'baz'), {
+        renderHook(() => usePluginData('foo', 'baz', {failfast: true}), {
           wrapper: ({children}) => (
             <Context.Provider
               // eslint-disable-next-line react/jsx-no-constructed-context-values

packages/docusaurus/src/client/exports/useGlobalData.ts

@@ -7,7 +7,7 @@
 
 import useDocusaurusContext from './useDocusaurusContext';
 import {DEFAULT_PLUGIN_ID} from './constants';
-import type {GlobalData} from '@docusaurus/types';
+import type {GlobalData, UseDataOptions} from '@docusaurus/types';
 
 export default function useGlobalData(): GlobalData {
   const {globalData} = useDocusaurusContext();
@@ -19,10 +19,11 @@ export default function useGlobalData(): GlobalData {
 
 export function useAllPluginInstancesData(
   pluginName: string,
-): GlobalData[string] {
+  options: UseDataOptions = {},
+): GlobalData[string] | undefined {
   const globalData = useGlobalData();
   const pluginGlobalData = globalData[pluginName];
-  if (!pluginGlobalData) {
+  if (!pluginGlobalData && options.failfast) {
     throw new Error(
       `Docusaurus plugin global data not found for "${pluginName}" plugin.`,
     );
@@ -33,10 +34,11 @@ export function useAllPluginInstancesData(
 export function usePluginData(
   pluginName: string,
   pluginId: string = DEFAULT_PLUGIN_ID,
+  options: UseDataOptions = {},
 ): GlobalData[string][string] {
   const pluginGlobalData = useAllPluginInstancesData(pluginName);
-  const pluginInstanceGlobalData = pluginGlobalData[pluginId];
-  if (!pluginInstanceGlobalData) {
+  const pluginInstanceGlobalData = pluginGlobalData?.[pluginId];
+  if (!pluginInstanceGlobalData && options.failfast) {
     throw new Error(
       `Docusaurus plugin global data not found for "${pluginName}" plugin with id "${pluginId}".`,
     );

website/docs/docusaurus-core.md

@@ -544,7 +544,11 @@ This is the most convenient hook to access plugin global data and should be used
 `pluginId` is optional if you don't use multi-instance plugins.
 
 ```ts
-function usePluginData(pluginName: string, pluginId?: string);
+function usePluginData(
+  pluginName: string,
+  pluginId?: string,
+  options?: {failfast?: boolean},
+);
 ```
 
 Usage example:
@@ -567,7 +571,10 @@ const MyComponent = () => {
 Access global data created by a specific plugin. Given a plugin name, it returns the data of all the plugins instances of that name, by plugin id.
 
 ```ts
-useAllPluginInstancesData(pluginName: string)
+function useAllPluginInstancesData(
+  pluginName: string,
+  options?: {failfast?: boolean},
+);
 ```
 
 Usage example: