diff --git a/packages/core-app-api/alpha-api-report.md b/packages/core-app-api/alpha-api-report.md
new file mode 100644
index 0000000000..23d055efee
--- /dev/null
+++ b/packages/core-app-api/alpha-api-report.md
@@ -0,0 +1,94 @@
+## API Report File for "@backstage/core-app-api"
+
+> Do not edit this file. It is a report generated by [API Extractor](https://api-extractor.com/).
+
+```ts
+import { AppLanguageApi } from '@backstage/core-plugin-api/alpha';
+import { AppTheme } from '@backstage/core-plugin-api';
+import { AppThemeApi } from '@backstage/core-plugin-api';
+import { Observable } from '@backstage/types';
+import { TranslationApi } from '@backstage/core-plugin-api/alpha';
+import { TranslationMessages } from '@backstage/core-plugin-api/alpha';
+import { TranslationRef } from '@backstage/core-plugin-api/alpha';
+import { TranslationResource } from '@backstage/core-plugin-api/alpha';
+import { TranslationSnapshot } from '@backstage/core-plugin-api/alpha';
+
+// @alpha
+export class AppLanguageSelector implements AppLanguageApi {
+  // (undocumented)
+  static create(options?: AppLanguageSelectorOptions): AppLanguageSelector;
+  // (undocumented)
+  static createWithStorage(
+    options?: AppLanguageSelectorOptions,
+  ): AppLanguageSelector;
+  // (undocumented)
+  getAvailableLanguages(): {
+    languages: string[];
+  };
+  // (undocumented)
+  getLanguage(): {
+    language: string;
+  };
+  // (undocumented)
+  language$(): Observable<{
+    language: string;
+  }>;
+  // (undocumented)
+  setLanguage(language?: string | undefined): void;
+}
+
+// @alpha (undocumented)
+export interface AppLanguageSelectorOptions {
+  // (undocumented)
+  availableLanguages?: string[];
+  // (undocumented)
+  defaultLanguage?: string;
+}
+
+// @public
+export class AppThemeSelector implements AppThemeApi {
+  constructor(themes: AppTheme[]);
+  // (undocumented)
+  activeThemeId$(): Observable<string | undefined>;
+  // (undocumented)
+  static createWithStorage(themes: AppTheme[]): AppThemeSelector;
+  // (undocumented)
+  getActiveThemeId(): string | undefined;
+  // (undocumented)
+  getInstalledThemes(): AppTheme[];
+  // (undocumented)
+  setActiveThemeId(themeId?: string): void;
+}
+
+// @alpha (undocumented)
+export class I18nextTranslationApi implements TranslationApi {
+  // (undocumented)
+  static create(options: I18nextTranslationApiOptions): I18nextTranslationApi;
+  // (undocumented)
+  getTranslation<
+    TMessages extends {
+      [key in string]: string;
+    },
+  >(
+    translationRef: TranslationRef<string, TMessages>,
+  ): TranslationSnapshot<TMessages>;
+  // (undocumented)
+  translation$<
+    TMessages extends {
+      [key in string]: string;
+    },
+  >(
+    translationRef: TranslationRef<string, TMessages>,
+  ): Observable<TranslationSnapshot<TMessages>>;
+}
+
+// @alpha (undocumented)
+export interface I18nextTranslationApiOptions {
+  // (undocumented)
+  languageApi: AppLanguageApi;
+  // (undocumented)
+  resources?: Array<TranslationMessages | TranslationResource>;
+}
+
+// (No @packageDocumentation comment for this package)
+```
diff --git a/packages/core-app-api/src/alpha.ts b/packages/core-app-api/src/alpha.ts
index 286f3aa242..de7f5a3925 100644
--- a/packages/core-app-api/src/alpha.ts
+++ b/packages/core-app-api/src/alpha.ts
@@ -14,7 +14,19 @@
  * limitations under the License.
  */
 import { AppThemeSelector } from './apis';
-import { AppLanguageSelector } from './apis/implementations/AppLanguageApi';
-import { I18nextTranslationApi } from './apis/implementations/TranslationApi';
+import {
+  AppLanguageSelector,
+  AppLanguageSelectorOptions,
+} from './apis/implementations/AppLanguageApi';
+import {
+  I18nextTranslationApi,
+  I18nextTranslationApiOptions,
+} from './apis/implementations/TranslationApi';
 
-export { AppLanguageSelector, AppThemeSelector, I18nextTranslationApi };
+export {
+  type AppLanguageSelectorOptions,
+  type I18nextTranslationApiOptions,
+  AppLanguageSelector,
+  AppThemeSelector,
+  I18nextTranslationApi,
+};