Add config, type fixes

Signed-off-by: Tim Hansen <timbonicush@spotify.com>

plugins/permission-common/config.d.ts

@@ -0,0 +1,27 @@
+/*
+ * Copyright 2021 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 {
+  /** Configuration options for Backstage permissions and authorization */
+  permission?: {
+    /**
+     * Whether authorization is enabled in Backstage. Defaults to false, which means authorization
+     * requests will be automatically allowed without invoking the authorization policy.
+     * @visibility frontend
+     */
+    enabled?: boolean;
+  };
+}