import { Rule, Tree } from '@angular-devkit/schematics';
export declare type packgeType = 'dependencies' | 'devDependencies' | 'scripts';
export declare function readPackageJson(tree: Tree, type?: string): any;
export declare function writePackageJson(tree: Tree, json: any): any;
export declare function addPackage(tree: Tree, packages: string | string[], type?: packgeType): Tree;
export declare function modifyAngularJson(styles: string | string[], defaultProject: string): Rule;