Add default feature type information to backstage metadata

Signed-off-by: Harrison Hogg <hhogg@spotify.com>

packages/cli-node/src/monorepo/PackageGraph.ts

@@ -22,6 +22,24 @@ import { GitUtils } from '../git';
 import { Lockfile } from './Lockfile';
 import { JsonValue } from '@backstage/types';
 
+/**
+ * A list of the feature types we want to extract from the project
+ * and include in the metadata
+ *
+ * @public
+ */
+export const packageFeatureType = [
+  '@backstage/BackendFeature',
+  '@backstage/BackstagePlugin',
+  '@backstage/FrontendPlugin',
+  '@backstage/FrontendModule',
+] as const;
+
+/**
+ * @public
+ */
+export type BackstagePackageFeatureType = (typeof packageFeatureType)[number];
+
 /**
  * Known fields in Backstage package.json files.
  *
@@ -72,6 +90,11 @@ export interface BackstagePackageJson {
      * All packages that are part of the plugin. Must always and only be set for plugin packages and plugin library packages.
      */
     pluginPackages?: string[];
+
+    /**
+     * The feature types exported from the package, indexed by path.
+     */
+    features?: Record<string, BackstagePackageFeatureType>;
   };
 
   exports?: JsonValue;

packages/cli-node/src/monorepo/index.ts

@@ -16,10 +16,12 @@
 
 export { isMonoRepo } from './isMonoRepo';
 export {
+  packageFeatureType,
   PackageGraph,
   type PackageGraphNode,
   type BackstagePackage,
   type BackstagePackageJson,
+  type BackstagePackageFeatureType,
 } from './PackageGraph';
 export {
   Lockfile,