refactor(theme): move LayoutProviders to Layout/Provider; composeProviders util

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

@@ -596,14 +596,14 @@ declare module '@theme/Layout' {
   export default function Layout(props: Props): JSX.Element;
 }
 
-declare module '@theme/LayoutProviders' {
+declare module '@theme/Layout/Provider' {
   import type {ReactNode} from 'react';
 
   export interface Props {
     readonly children: ReactNode;
   }
 
-  export default function LayoutProviders(props: Props): JSX.Element;
+  export default function LayoutProvider(props: Props): JSX.Element;
 }
 
 declare module '@theme/SearchMetadata' {

packages/docusaurus-theme-classic/src/theme/Layout/Provider/index.tsx

@@ -0,0 +1,33 @@
+/**
+ * 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 {composeProviders} from '@docusaurus/theme-common';
+import {
+  ColorModeProvider,
+  TabGroupChoiceProvider,
+  AnnouncementBarProvider,
+  DocsPreferredVersionContextProvider,
+  ScrollControllerProvider,
+  NavbarProvider,
+  PluginHtmlClassNameProvider,
+} from '@docusaurus/theme-common/internal';
+import type {Props} from '@theme/Layout/Provider';
+
+const Provider = composeProviders([
+  ColorModeProvider,
+  AnnouncementBarProvider,
+  TabGroupChoiceProvider,
+  ScrollControllerProvider,
+  DocsPreferredVersionContextProvider,
+  PluginHtmlClassNameProvider,
+  NavbarProvider,
+]);
+
+export default function LayoutProvider({children}: Props): JSX.Element {
+  return <Provider>{children}</Provider>;
+}

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

@@ -14,7 +14,7 @@ import SkipToContent from '@theme/SkipToContent';
 import AnnouncementBar from '@theme/AnnouncementBar';
 import Navbar from '@theme/Navbar';
 import Footer from '@theme/Footer';
-import LayoutProviders from '@theme/LayoutProviders';
+import LayoutProvider from '@theme/Layout/Provider';
 import ErrorPageContent from '@theme/ErrorPageContent';
 import './styles.css';
 import type {Props} from '@theme/Layout';
@@ -32,7 +32,7 @@ export default function Layout(props: Props): JSX.Element {
   useKeyboardNavigation();
 
   return (
-    <LayoutProviders>
+    <LayoutProvider>
       <PageMetadata title={title} description={description} />
 
       <SkipToContent />
@@ -48,6 +48,6 @@ export default function Layout(props: Props): JSX.Element {
       </div>
 
       {!noFooter && <Footer />}
-    </LayoutProviders>
+    </LayoutProvider>
   );
 }

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

@@ -175,7 +175,7 @@ function DocsPreferredVersionContextProviderUnsafe({
 export function DocsPreferredVersionContextProvider({
   children,
 }: {
-  children: JSX.Element;
+  children: ReactNode;
 }): JSX.Element {
   if (isDocsPluginEnabled) {
     return (
@@ -184,7 +184,7 @@ export function DocsPreferredVersionContextProvider({
       </DocsPreferredVersionContextProviderUnsafe>
     );
   }
-  return children;
+  return <>{children}</>;
 }
 
 function useDocsPreferredVersionContext(): ContextValue {

packages/docusaurus-theme-common/src/index.ts

@@ -40,6 +40,7 @@ export {
   useIsomorphicLayoutEffect,
   useEvent,
   usePrevious,
+  composeProviders,
   ReactContextError,
 } from './utils/reactUtils';
 

packages/docusaurus-theme-common/src/utils/reactUtils.tsx

@@ -5,7 +5,14 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-import {useCallback, useEffect, useLayoutEffect, useMemo, useRef} from 'react';
+import type {ComponentType, ReactNode} from 'react';
+import React, {
+  useCallback,
+  useEffect,
+  useLayoutEffect,
+  useMemo,
+  useRef,
+} from 'react';
 import ExecutionEnvironment from '@docusaurus/ExecutionEnvironment';
 
 /**
@@ -90,3 +97,32 @@ export function useShallowMemoObject<O extends object>(obj: O): O {
   // eslint-disable-next-line react-hooks/exhaustive-deps
   return useMemo(() => obj, deps.flat());
 }
+
+type SimpleProvider = ComponentType<{children: ReactNode}>;
+
+/**
+ * Creates a single React provider from an array of existing providers
+ * assuming providers only take "children" as props.
+ *
+ * Prevents the annoying React element nesting
+ * Example here: https://getfrontend.tips/compose-multiple-react-providers/
+ *
+ * The order matters:
+ * - The first provider is at the top of the tree.
+ * - The last provider is the most nested one
+ *
+ * @param providers array of providers to compose
+ */
+export function composeProviders(providers: SimpleProvider[]): SimpleProvider {
+  // Creates a single React component: it's cheaper to compose JSX elements
+  return ({children}) => (
+    <>
+      {providers.reduceRight(
+        (element, CurrentProvider) => (
+          <CurrentProvider>{element}</CurrentProvider>
+        ),
+        children,
+      )}
+    </>
+  );
+}