chore: revert small change

Signed-off-by: blam <ben@blam.sh>

packages/core-compat-api/api-report.md

@@ -11,6 +11,7 @@ import { AnyRouteRefParams } from '@backstage/core-plugin-api';
 import { BackstagePlugin } from '@backstage/core-plugin-api';
 import { ComponentType } from 'react';
 import { ExtensionDefinition } from '@backstage/frontend-plugin-api';
+import { ExtensionOverrides } from '@backstage/frontend-plugin-api';
 import { ExternalRouteRef } from '@backstage/core-plugin-api';
 import { ExternalRouteRef as ExternalRouteRef_2 } from '@backstage/frontend-plugin-api';
 import { FrontendModule } from '@backstage/frontend-plugin-api';
@@ -28,7 +29,7 @@ export function compatWrapper(element: ReactNode): React_2.JSX.Element;
 // @public (undocumented)
 export function convertLegacyApp(
   rootElement: React_2.JSX.Element,
-): (FrontendPlugin | FrontendModule)[];
+): (FrontendPlugin | FrontendModule | ExtensionOverrides)[];
 
 // @public (undocumented)
 export function convertLegacyPageExtension(

packages/core-compat-api/src/convertLegacyApp.ts

@@ -26,6 +26,7 @@ import {
   FrontendPlugin,
   coreExtensionData,
   createExtension,
+  ExtensionOverrides,
   createExtensionInput,
   createFrontendModule,
 } from '@backstage/frontend-plugin-api';
@@ -61,7 +62,7 @@ function selectChildren(
 /** @public */
 export function convertLegacyApp(
   rootElement: React.JSX.Element,
-): (FrontendPlugin | FrontendModule)[] {
+): (FrontendPlugin | FrontendModule | ExtensionOverrides)[] {
   if (getComponentData(rootElement, 'core.type') === 'FlatRoutes') {
     return collectLegacyRoutes(rootElement);
   }