Add fix

Author: damienbod

projects/schematics/src/ng-add/actions/add-standalone-import.ts

@@ -7,14 +7,14 @@ export function addStandaloneConfigsToProviders(options: NgAddOptions): Rule {
   return (host: Tree, context: SchematicContext) => {
     const [projectName] = getProject(host);
     const { fileName } = options.standaloneInfo!;
-    
+
     context.logger.info(`✅️ All imports done, please add the 'provideRouter()' as well if you don't have it provided yet.`);
 
     return chain([
       addRootProvider(projectName, ({code, external}) => {
         external('authConfig', `./auth/${fileName}`);
         return code`${external('provideAuth', 'angular-auth-oidc-client')}(authConfig)`;
       }),
-    ]);
+    ] as Iterable<Rule>);
   };
 }