amaannawab923 commented on code in PR #45522:
URL: https://github.com/apache/superset/pull/45522#discussion_r4389348102


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superset-frontend/src/pages/ExtensionPage/index.tsx:
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@@ -0,0 +1,105 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import { useEffect, useState } from 'react';
+import { useLocation } from 'react-router-dom';
+import { t } from '@apache-superset/core/translation';
+import { Loading } from '@superset-ui/core/components';
+import { findPageByPath, resolvePage, usePages } from 'src/core/pages';
+import ExtensionsLoader from 'src/extensions/ExtensionsLoader';
+import { ErrorAlert } from 'src/components/ErrorMessage/ErrorAlert';
+
+/**
+ * Renders whichever extension page claims the current URL.
+ *
+ * Mounted on a catch-all route that every host route outranks, so this is
+ * reached only for a path the host itself does not serve. Whether an
+ * extension serves it can only be decided once extensions have finished
+ * loading, so until then this must not say "not found": the page may be
+ * moments away.
+ */
+export default function ExtensionPage() {

Review Comment:
   Agreed, and we're taking the SIP's approach here rather than patching around 
it.
   
   Worth recording why it belongs with the route change: `derivePage` is a pure 
function of the pathname, and with author-chosen flat paths nothing about 
`/approvals` identifies it as an extension page — so it would have to consult 
the registered path set, which isn't known at module load 
(`navigation/index.ts` derives the initial value at import time, while declared 
pages arrive after the `userId` gate and a fetch). Under the host-owned 
`/extensions/pages/<pageId>` route it's one `PAGE_ROUTES` entry and the timing 
problem doesn't exist. Same entry keys the active-tab highlighting in your 
other comment.
   
   Two things we found while scoping it:
   
   - `'extension'` as a single union value can't distinguish one contributed 
page from another, or two pages of the same extension. Since the `navigation` 
namespace is deliberately payload-free by its own fileoverview, we'd keep 
`Page` a string union and add an accessor to the `pages` namespace, which 
already owns `ResolvedPage` and the subscribe machinery, for callers that need 
to know which page.
   - Adding the member looks safe to ship: there's no exhaustive `switch` or 
`Record<Page, …>` over `getPage()` anywhere in the repo, so it's an additive 
change here and compile-time only for a published consumer.
   
   Separately, and pre-existing: `'home'` doubles as the welcome surface and as 
the fallback for any route not enumerated, which is why a dashboard to 
extension-page transition fires a confident `'home'` — and why `/roles/`, 
`/theme/list/` and `/tasks/list/` report `'home'` today. Probably worth 
splitting regardless of this PR.
   
   Not in the push above; it lands with the route move.



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