core-app-api: expose appTheme and some translation stuff

Signed-off-by: Vincenzo Scamporlino <vincenzos@spotify.com>

packages/core-app-api/package.json

@@ -7,10 +7,14 @@
   },
   "exports": {
     ".": "./src/index.ts",
+    "./alpha": "./src/alpha.ts",
     "./package.json": "./package.json"
   },
   "typesVersions": {
     "*": {
+      "alpha": [
+        "src/alpha.ts"
+      ],
       "package.json": [
         "package.json"
       ]

packages/core-app-api/src/alpha.ts

@@ -0,0 +1,20 @@
+/*
+ * Copyright 2023 The Backstage Authors
+ *
+ * Licensed 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 { AppThemeSelector } from './apis';
+import { AppLanguageSelector } from './apis/implementations/AppLanguageApi';
+import { I18nextTranslationApi } from './apis/implementations/TranslationApi';
+
+export { AppLanguageSelector, AppThemeSelector, I18nextTranslationApi };