fix: baseUrl passed to sortConfig (#5824)

packages/docusaurus/src/server/plugins/__tests__/__snapshots__/init.test.ts.snap

@@ -82,3 +82,48 @@ Array [
   },
 ]
 `;
+
+exports[`sortConfig should sort route config given a baseURL 1`] = `
+Array [
+  Object {
+    "component": "",
+    "path": "/latest/community",
+  },
+  Object {
+    "component": "",
+    "path": "/latest/example",
+  },
+  Object {
+    "component": "",
+    "path": "/latest/some-page",
+  },
+  Object {
+    "component": "",
+    "path": "/latest/docs",
+    "routes": Array [
+      Object {
+        "component": "",
+        "path": "/latest/docs/someDoc",
+      },
+      Object {
+        "component": "",
+        "path": "/latest/docs/someOtherDoc",
+      },
+    ],
+  },
+  Object {
+    "component": "",
+    "path": "/latest",
+    "routes": Array [
+      Object {
+        "component": "",
+        "path": "/latest/someDoc",
+      },
+      Object {
+        "component": "",
+        "path": "/latest/someOtherDoc",
+      },
+    ],
+  },
+]
+`;

packages/docusaurus/src/server/plugins/__tests__/init.test.ts

@@ -87,4 +87,42 @@ describe('sortConfig', () => {
 
     expect(routes).toMatchSnapshot();
   });
+
+  test('should sort route config given a baseURL', () => {
+    const baseURL = '/latest';
+    const routes: RouteConfig[] = [
+      {
+        path: baseURL,
+        component: '',
+        routes: [
+          {path: `${baseURL}/someDoc`, component: ''},
+          {path: `${baseURL}/someOtherDoc`, component: ''},
+        ],
+      },
+      {
+        path: `${baseURL}/example`,
+        component: '',
+      },
+      {
+        path: `${baseURL}/docs`,
+        component: '',
+        routes: [
+          {path: `${baseURL}/docs/someDoc`, component: ''},
+          {path: `${baseURL}/docs/someOtherDoc`, component: ''},
+        ],
+      },
+      {
+        path: `${baseURL}/community`,
+        component: '',
+      },
+      {
+        path: `${baseURL}/some-page`,
+        component: '',
+      },
+    ];
+
+    sortConfig(routes, baseURL);
+
+    expect(routes).toMatchSnapshot();
+  });
 });

packages/docusaurus/src/server/plugins/index.ts

@@ -26,15 +26,18 @@ import {chain} from 'lodash';
 import {localizePluginTranslationFile} from '../translations/translations';
 import applyRouteTrailingSlash from './applyRouteTrailingSlash';
 
-export function sortConfig(routeConfigs: RouteConfig[]): void {
+export function sortConfig(
+  routeConfigs: RouteConfig[],
+  baseUrl: string = '/',
+): void {
   // Sort the route config. This ensures that route with nested
   // routes is always placed last.
   routeConfigs.sort((a, b) => {
     // Root route should get placed last.
-    if (a.path === '/' && b.path !== '/') {
+    if (a.path === baseUrl && b.path !== baseUrl) {
       return 1;
     }
-    if (a.path !== '/' && b.path === '/') {
+    if (a.path !== baseUrl && b.path === baseUrl) {
       return -1;
     }
 
@@ -221,7 +224,7 @@ export async function loadPlugins({
 
   // Sort the route config. This ensures that route with nested
   // routes are always placed last.
-  sortConfig(pluginsRouteConfigs);
+  sortConfig(pluginsRouteConfigs, context.siteConfig.baseUrl);
 
   // Apply each plugin one after the other to translate the theme config
   function translateThemeConfig(