plugins: remove usages of --experimental-type-build

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

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

@@ -0,0 +1,13 @@
+## API Report File for "@backstage/plugin-proxy-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';
+
+// @alpha
+const _default: () => BackendFeature;
+export default _default;
+
+// (No @packageDocumentation comment for this package)
+```

plugins/proxy-backend/api-report.md

@@ -3,7 +3,6 @@
 > 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';
@@ -12,10 +11,6 @@ import { PluginEndpointDiscovery } from '@backstage/backend-common';
 // @public
 export function createRouter(options: RouterOptions): Promise<express.Router>;
 
-// @alpha
-const proxyPlugin: () => BackendFeature;
-export default proxyPlugin;
-
 // @public (undocumented)
 export interface RouterOptions {
   // (undocumented)

plugins/proxy-backend/package.json

@@ -6,10 +6,22 @@
   "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",
+    "./package.json": "./package.json"
+  },
+  "typesVersions": {
+    "*": {
+      "alpha": [
+        "src/alpha.ts"
+      ],
+      "package.json": [
+        "package.json"
+      ]
+    }
   },
   "backstage": {
     "role": "backend-plugin"
@@ -25,7 +37,7 @@
   ],
   "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",

plugins/proxy-backend/src/alpha.ts

@@ -26,7 +26,7 @@ import { createRouter } from './service/router';
  *
  * @alpha
  */
-export const proxyPlugin = createBackendPlugin({
+export default createBackendPlugin({
   pluginId: 'proxy',
   register(env) {
     env.registerInit({

plugins/proxy-backend/src/index.ts

@@ -21,4 +21,3 @@
  */
 
 export * from './service';
-export { proxyPlugin as default } from './plugin';