frontend-app-api: added config schema

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

packages/frontend-app-api/config.d.ts

@@ -0,0 +1,35 @@
+/*
+ * 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.
+ */
+
+export interface Config {
+  app?: {
+    /**
+     * @deepVisibility frontend
+     */
+    extensions?:
+      | string
+      | {
+          [extensionId: string]:
+            | boolean
+            | string
+            | {
+                at?: string;
+                extension?: string;
+                config?: unknown;
+              };
+        };
+  };
+}

packages/frontend-app-api/package.json

@@ -26,7 +26,9 @@
     "@backstage/cli": "workspace:^",
     "@testing-library/jest-dom": "^5.10.1"
   },
+  "configSchema": "config.d.ts",
   "files": [
+    "config.d.ts",
     "dist"
   ],
   "dependencies": {