frontend-app-api: remove support for experimental package config

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

.changeset/plenty-dryers-tan.md

@@ -0,0 +1,7 @@
+---
+'@backstage/frontend-defaults': patch
+'@backstage/frontend-app-api': patch
+'@backstage/cli': patch
+---
+
+Completely removed support for the deprecated `app.experimental.packages` configuration. Replace existing usage directly with `app.packages`.

packages/cli/src/modules/build/lib/bundler/packageDetection.ts

@@ -32,10 +32,7 @@ interface PackageDetectionConfig {
 function readPackageDetectionConfig(
   config: Config,
 ): PackageDetectionConfig | undefined {
-  // The experimental key is deprecated, but supported still for backwards compatibility
-  const packages =
-    config.getOptional('app.packages') ??
-    config.getOptional('app.experimental.packages');
+  const packages = config.getOptional('app.packages');
   if (packages === undefined || packages === null) {
     return undefined;
   }

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

@@ -16,15 +16,6 @@
 
 export interface Config {
   app?: {
-    experimental?: {
-      /**
-       * @visibility frontend
-       * @deepVisibility frontend
-       * @deprecated This is no longer experimental; use `app.packages` instead.
-       */
-      packages?: 'all' | { include?: string[]; exclude?: string[] };
-    };
-
     /**
      * Controls what packages are loaded by the new frontend system.
      *

packages/frontend-defaults/src/discovery.ts

@@ -26,10 +26,7 @@ interface DiscoveryGlobal {
 }
 
 function readPackageDetectionConfig(config: Config) {
-  // The experimental key is deprecated, but supported still for backwards compatibility
-  const packages =
-    config.getOptional('app.packages') ??
-    config.getOptional('app.experimental.packages');
+  const packages = config.getOptional('app.packages');
   if (packages === undefined || packages === null) {
     return undefined;
   }