fix(v2): ignore hash changes in useChangeRoute hook (#5023)

* fix(v2): ignore hash changes in useChangeRoute hook

* refactor and introduce useLocationChange hook

Co-authored-by: slorber <lorber.sebastien@gmail.com>

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

@@ -167,6 +167,10 @@ declare module '@docusaurus/router' {
   // eslint-disable-next-line import/no-extraneous-dependencies
   export * from 'react-router-dom';
 }
+declare module '@docusaurus/history' {
+  // eslint-disable-next-line import/no-extraneous-dependencies
+  export * from 'history';
+}
 
 declare module '@docusaurus/useDocusaurusContext' {
   export default function (): any;

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

@@ -7,7 +7,11 @@
 
 import React, {useState, useCallback, useEffect, useRef, memo} from 'react';
 import clsx from 'clsx';
-import {useThemeConfig, isSamePath} from '@docusaurus/theme-common';
+import {
+  useThemeConfig,
+  isSamePath,
+  usePrevious,
+} from '@docusaurus/theme-common';
 import useUserPreferencesContext from '@theme/hooks/useUserPreferencesContext';
 import useLockBodyScroll from '@theme/hooks/useLockBodyScroll';
 import useWindowSize, {windowSizes} from '@theme/hooks/useWindowSize';
@@ -25,14 +29,6 @@ import styles from './styles.module.css';
 
 const MOBILE_TOGGLE_SIZE = 24;
 
-function usePrevious(value) {
-  const ref = useRef(value);
-  useEffect(() => {
-    ref.current = value;
-  }, [value]);
-  return ref.current;
-}
-
 const isActiveSidebarItem = (item, activePath) => {
   if (item.type === 'link') {
     return isSamePath(item.href, activePath);

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

@@ -8,7 +8,7 @@
 import React, {useRef} from 'react';
 import clsx from 'clsx';
 import Translate from '@docusaurus/Translate';
-import {useChangeRoute} from '@docusaurus/theme-common';
+import {useLocationChange} from '@docusaurus/theme-common';
 
 import styles from './styles.module.css';
 
@@ -32,8 +32,8 @@ function SkipToContent(): JSX.Element {
     }
   };
 
-  useChangeRoute(() => {
-    if (containerRef.current) {
+  useLocationChange(({location}) => {
+    if (containerRef.current && !location.hash) {
       programmaticFocus(containerRef.current);
     }
   });

packages/docusaurus-theme-classic/src/theme/hooks/useHideableNavbar.ts

@@ -8,7 +8,7 @@
 import {useState, useCallback, useEffect, useRef} from 'react';
 import {useLocation} from '@docusaurus/router';
 import useScrollPosition from '@theme/hooks/useScrollPosition';
-import {useChangeRoute} from '@docusaurus/theme-common';
+import {useLocationChange} from '@docusaurus/theme-common';
 import type {useHideableNavbarReturns} from '@theme/hooks/useHideableNavbar';
 
 const useHideableNavbar = (hideOnScroll: boolean): useHideableNavbarReturns => {
@@ -56,8 +56,8 @@ const useHideableNavbar = (hideOnScroll: boolean): useHideableNavbarReturns => {
     [navbarHeight, isFocusedAnchor],
   );
 
-  useChangeRoute(() => {
-    if (!hideOnScroll) {
+  useLocationChange((locationChangeEvent) => {
+    if (!hideOnScroll || locationChangeEvent.location.hash) {
       return;
     }
 

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

@@ -33,7 +33,9 @@ export {useTitleFormatter} from './utils/generalUtils';
 
 export {usePluralForm} from './utils/usePluralForm';
 
-export {useChangeRoute} from './utils/useChangeRoute';
+export {useLocationChange} from './utils/useLocationChange';
+
+export {usePrevious} from './utils/usePrevious';
 
 export {
   useDocsPreferredVersion,

packages/docusaurus-theme-common/src/utils/useChangeRoute.ts

@@ -1,21 +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 {useRef, useEffect} from 'react';
-import {useLocation} from '@docusaurus/router';
-
-export function useChangeRoute(onRouteChange: () => void): void {
-  const {pathname} = useLocation();
-  const latestPathnameRef = useRef(pathname);
-
-  useEffect(() => {
-    if (pathname !== latestPathnameRef.current) {
-      latestPathnameRef.current = pathname;
-      onRouteChange();
-    }
-  }, [pathname, latestPathnameRef, onRouteChange]);
-}

packages/docusaurus-theme-common/src/utils/useLocationChange.ts

@@ -0,0 +1,37 @@
+/**
+ * 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 {useEffect, useRef} from 'react';
+import {useLocation} from '@docusaurus/router';
+import {Location} from '@docusaurus/history';
+import {usePrevious} from './usePrevious';
+
+type LocationChangeEvent = {
+  location: Location;
+  previousLocation: Location | undefined;
+};
+
+type OnLocationChange = (locationChangeEvent: LocationChangeEvent) => void;
+
+export function useLocationChange(onLocationChange: OnLocationChange): void {
+  const location = useLocation();
+  const previousLocation = usePrevious(location);
+  const isFirst = useRef<boolean>(true);
+
+  useEffect(() => {
+    // Prevent first effect to trigger the listener on mount
+    if (isFirst.current) {
+      isFirst.current = false;
+      return;
+    }
+
+    onLocationChange({
+      location,
+      previousLocation,
+    });
+  }, [location]);
+}

packages/docusaurus-theme-common/src/utils/usePrevious.ts

@@ -0,0 +1,18 @@
+/**
+ * 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 {useRef, useEffect} from 'react';
+
+export function usePrevious<T>(value: T): T | undefined {
+  const ref = useRef<T>();
+
+  useEffect(() => {
+    ref.current = value;
+  });
+
+  return ref.current;
+}