feat: Add on mode init hook (#3882)

platform/app/src/routes/Mode/Mode.tsx

@@ -124,6 +124,15 @@ export default function ModeRoute({
   const params = useParams();
   // The URL's query search parameters where the keys casing is maintained
   const query = useSearchParams();
+
+  mode?.onModeInit?.({
+    servicesManager,
+    extensionManager,
+    commandsManager,
+    appConfig,
+    query,
+  });
+
   // The URL's query search parameters where the keys are all lower case.
   const lowerCaseSearchParams = useSearchParams({ lowerCaseKeys: true });
 
@@ -341,6 +350,7 @@ export default function ModeRoute({
         servicesManager,
         extensionManager,
         commandsManager,
+        appConfig,
       });
 
       /**

platform/docs/docs/platform/modes/lifecycle.md

@@ -9,9 +9,18 @@ sidebar_label: Lifecycle Hooks
 
 Currently, there are two hooks that are called for modes:
 
+- onModeInit
 - onModeEnter
 - onModeExit
 
+## onModeInit
+
+This hook gets run before the defined route has been entered by the mode. This
+hook can be used for initialization before the first render.
+
+This is called before `onModeEnter` calls. This allows modes to add or activate their own
+data sources and configuration before entering the mode (pre registrations).
+
 ## onModeEnter
 
 This hook gets run after the defined route has been entered by the mode. This