app-backend: migrate to use exports

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

plugins/app-backend/alpha-api-report.md

@@ -0,0 +1,21 @@
+## API Report File for "@backstage/plugin-app-backend"
+
+> Do not edit this file. It is a report generated by [API Extractor](https://api-extractor.com/).
+
+```ts
+import { BackendFeature } from '@backstage/backend-plugin-api';
+import express from 'express';
+
+// @alpha
+export const appPlugin: (options: AppPluginOptions) => BackendFeature;
+
+// @alpha (undocumented)
+export type AppPluginOptions = {
+  appPackageName?: string;
+  staticFallbackHandler?: express.Handler;
+  disableConfigInjection?: boolean;
+  disableStaticFallbackCache?: boolean;
+};
+
+// (No @packageDocumentation comment for this package)
+```

plugins/app-backend/api-report.md

@@ -3,23 +3,11 @@
 > Do not edit this file. It is a report generated by [API Extractor](https://api-extractor.com/).
 
 ```ts
-import { BackendFeature } from '@backstage/backend-plugin-api';
 import { Config } from '@backstage/config';
 import express from 'express';
 import { Logger } from 'winston';
 import { PluginDatabaseManager } from '@backstage/backend-common';
 
-// @alpha
-export const appPlugin: (options: AppPluginOptions) => BackendFeature;
-
-// @alpha (undocumented)
-export type AppPluginOptions = {
-  appPackageName?: string;
-  staticFallbackHandler?: express.Handler;
-  disableConfigInjection?: boolean;
-  disableStaticFallbackCache?: boolean;
-};
-
 // @public (undocumented)
 export function createRouter(options: RouterOptions): Promise<express.Router>;
 

plugins/app-backend/package.json

@@ -6,10 +6,21 @@
   "types": "src/index.ts",
   "license": "Apache-2.0",
   "publishConfig": {
-    "access": "public",
-    "main": "dist/index.cjs.js",
-    "types": "dist/index.d.ts",
-    "alphaTypes": "dist/index.alpha.d.ts"
+    "access": "public"
+  },
+  "exports": {
+    ".": "./src/index.ts",
+    "./alpha": "./src/alpha.ts"
+  },
+  "typesVersions": {
+    "*": {
+      "*": [
+        "src/index.ts"
+      ],
+      "alpha": [
+        "src/alpha.ts"
+      ]
+    }
   },
   "backstage": {
     "role": "backend-plugin"
@@ -25,7 +36,7 @@
   ],
   "scripts": {
     "start": "backstage-cli package start",
-    "build": "backstage-cli package build --experimental-type-build",
+    "build": "backstage-cli package build",
     "lint": "backstage-cli package lint",
     "test": "backstage-cli package test",
     "prepack": "backstage-cli package prepack",
@@ -63,7 +74,6 @@
   },
   "files": [
     "dist",
-    "alpha",
     "migrations/**/*.{js,d.ts}",
     "static"
   ]

plugins/app-backend/src/alpha.ts

@@ -0,0 +1,18 @@
+/*
+ * 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 { appPlugin } from './service/appPlugin';
+export type { AppPluginOptions } from './service/appPlugin';

plugins/app-backend/src/index.ts

@@ -21,5 +21,3 @@
  */
 
 export * from './service/router';
-export { appPlugin } from './service/appPlugin';
-export type { AppPluginOptions } from './service/appPlugin';