fix(core): revert wrong anchor link implementation change

.github/workflows/build-perf.yml

@@ -46,9 +46,11 @@ jobs:
         uses: preactjs/compressed-size-action@f780fd104362cfce9e118f9198df2ee37d12946c # v2
         with:
           repo-token: ${{ secrets.GITHUB_TOKEN }}
-          build-script: build:website:en
+          build-script: build:website:fast
           clean-script: clear:website # see https://github.com/facebook/docusaurus/pull/6838
-          pattern: '{website/build/assets/js/main*js,website/build/assets/css/styles*css,website/.docusaurus/globalData.json,website/.docusaurus/registry.js,website/.docusaurus/routes.js,website/.docusaurus/routesChunkNames.json,website/.docusaurus/site-metadata.json,website/.docusaurus/codeTranslations.json,website/.docusaurus/i18n.json,website/.docusaurus/docusaurus.config.mjs,website/build/index.html,website/build/blog/index.html,website/build/blog/**/introducing-docusaurus/*,website/build/docs/index.html,website/build/docs/installation/index.html,website/build/tests/docs/index.html,website/build/tests/docs/standalone/index.html}'
+          pattern: '{website/build/assets/js/main*js,website/build/assets/css/styles*css,website/.docusaurus/globalData.json,website/.docusaurus/registry.js,website/.docusaurus/routes.js,website/.docusaurus/routesChunkNames.json,website/.docusaurus/site-metadata.json,website/.docusaurus/codeTranslations.json,website/.docusaurus/i18n.json,website/.docusaurus/docusaurus.config.mjs,website/build/index.html,website/build/docs.html,website/build/docs/**/*.html,website/build/blog.html,website/build/blog/**/*.html}'
+          # HTML files: exclude versioned docs pages, tags pages, html redirect files
+          exclude: '{website/build/docs/?.?.?/**/*.html,website/build/docs/next/**/*.html,website/build/blog/tags/**/*.html,**/*.html.html}'
           strip-hash: '\.([^;]\w{7})\.'
           minimum-change-threshold: 30
           compression: none
@@ -68,11 +70,11 @@ jobs:
 
       # Ensure build with a cold cache does not increase too much
       - name: Build (cold cache)
-        run: yarn workspace website build --locale en
+        run: yarn build:website:fast
         timeout-minutes: 8
 
       # Ensure build with a warm cache does not increase too much
       - name: Build (warm cache)
-        run: yarn workspace website build --locale en
+        run: yarn build:website:fast
         timeout-minutes: 2
     # TODO post a GitHub comment with build with perf warnings?

packages/docusaurus/src/client/exports/Link.tsx

@@ -135,7 +135,7 @@ function Link(
 
   useEffect(() => {
     // If IO is not supported. We prefetch by default (only once).
-    if (!IOSupported && isInternal) {
+    if (!IOSupported && isInternal && ExecutionEnvironment.canUseDOM) {
       if (targetLink != null) {
         window.docusaurus.prefetch(targetLink);
       }
@@ -157,7 +157,15 @@ function Link(
   const hasInternalTarget = !props.target || props.target === '_self';
 
   // Should we use a regular <a> tag instead of React-Router Link component?
-  const isRegularHtmlLink = !targetLink || !isInternal || !hasInternalTarget;
+  const isRegularHtmlLink =
+    !targetLink ||
+    !isInternal ||
+    !hasInternalTarget ||
+    // When using the hash router, we can't use the regular <a> link for anchors
+    // We need to use React Router to navigate to /#/pathname/#anchor
+    // And not /#anchor
+    // See also https://github.com/facebook/docusaurus/pull/10311
+    (isAnchorLink && router !== 'hash');
 
   if (!noBrokenLinkCheck && (isAnchorLink || !isRegularHtmlLink)) {
     brokenLinks.collectLink(targetLink!);
@@ -167,6 +175,12 @@ function Link(
     brokenLinks.collectAnchor(props.id);
   }
 
+  // These props are only added in unit tests to assert/capture the type of link
+  const testOnlyProps =
+    process.env.NODE_ENV === 'test'
+      ? {'data-test-link-type': isRegularHtmlLink ? 'regular' : 'react-router'}
+      : {};
+
   return isRegularHtmlLink ? (
     // eslint-disable-next-line jsx-a11y/anchor-has-content, @docusaurus/no-html-links
     <a
@@ -175,6 +189,7 @@ function Link(
       {...(targetLinkUnprefixed &&
         !isInternal && {target: '_blank', rel: 'noopener noreferrer'})}
       {...props}
+      {...testOnlyProps}
     />
   ) : (
     <LinkComponent
@@ -186,6 +201,7 @@ function Link(
       // Avoid "React does not recognize the `activeClassName` prop on a DOM
       // element"
       {...(isNavLink && {isActive, activeClassName})}
+      {...testOnlyProps}
     />
   );
 }