message: core-app-api: createSpecializedApp returns a BackstageApp
diff: */
  import { AppManager } from './AppManager';
  -import { AppOptions } from './types';
  +import { AppOptions, BackstageApp } from './types';
  /**
  * Creates a new Backstage App where the full set of options are required.
  @@ -23,6 +23,6 @@ import { AppOptions } from './types';
  * @param options - A set of options for creating the app
  * @returns
  */
  -export function createSpecializedApp(options: AppOptions) {
  +export function createSpecializedApp(options: AppOptions): BackstageApp {
  return new AppManager(options);
  }
  