/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
import { Tree } from '@angular-devkit/schematics';
/**
 * Finds stylesheets in the given directory from within the specified tree.
 * @param tree Devkit tree where stylesheet files can be found in.
 * @param startDirectory Optional start directory where stylesheets should be searched in.
 *   This can be useful if only stylesheets within a given folder are relevant (to avoid
 *   unnecessary iterations).
 */
export declare function findStylesheetFiles(tree: Tree, startDirectory?: string): string[];