import { SchematicContext, Tree } from '@angular-devkit/schematics';
/**
 * Patches the application configuration to include or update the theme stack provider.
 * Uses a hybrid approach:
 * 1. Attempts the official 'addRootProvider' for standard standalone apps.
 * 2. If it fails or if the provider already exists, it uses a smart AST walker
 *    to either inject or UPDATE the existing configuration.
 */
export declare function patchAppConfig(tree: Tree, context: SchematicContext, projectSourceRoot: string, provideCall: string, projectName?: string): Promise<void>;