Apply review comments - export alpha symbols

Signed-off-by: Axel Koehler <axel@staffbase.com>

plugins/adr/alpha-api-report.md

@@ -0,0 +1,16 @@
+## API Report File for "@backstage/plugin-adr"
+
+> Do not edit this file. It is a report generated by [API Extractor](https://api-extractor.com/).
+
+```ts
+import { TranslationRef } from '@backstage/core-plugin-api/alpha';
+
+// @alpha (undocumented)
+export const adrTranslationRef: TranslationRef<{
+  readonly content_header_title: 'Architecture Decision Records';
+  readonly failed_to_fetch: 'Failed to fetch ADRs';
+  readonly no_adrs: 'No ADRs found';
+}>;
+
+// (No @packageDocumentation comment for this package)
+```

plugins/adr/package.json

@@ -4,10 +4,23 @@
   "main": "src/index.ts",
   "types": "src/index.ts",
   "license": "Apache-2.0",
+  "exports": {
+    ".": "./src/index.ts",
+    "./alpha": "./src/alpha.ts",
+    "./package.json": "./package.json"
+  },
+  "typesVersions": {
+    "*": {
+      "alpha": [
+        "src/alpha.ts"
+      ],
+      "package.json": [
+        "package.json"
+      ]
+    }
+  },
   "publishConfig": {
-    "access": "public",
-    "main": "dist/index.esm.js",
-    "types": "dist/index.d.ts"
+    "access": "public"
   },
   "backstage": {
     "role": "frontend-plugin"

plugins/adr/src/alpha.ts

@@ -0,0 +1,16 @@
+/*
+ * 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 * from './translations';

plugins/adr/src/translations.ts

@@ -22,5 +22,5 @@ export const adrTranslationRef = createTranslationRef({
     content_header_title: 'Architecture Decision Records',
     failed_to_fetch: 'Failed to fetch ADRs',
     no_adrs: 'No ADRs found',
-  },
+  } as const,
 });