/**
 * @license
 * Copyright Google Inc. 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 { Provider, ValueProvider, ClassProvider, TokenProvider, FactoryProvider } from '#di';
/**
 * Flattens an array.
 */
export declare function flatten<T = any>(list: any[], dst?: any[]): T[];
/**
 * Flatten and normalize an array of arrays DI Providers
 */
export declare function normalizeProviders(providers: Provider[], arrayOfProviders?: NormalizedProvider[]): NormalizedProvider[];
export type NormalizedProvider = ValueProvider | ClassProvider | TokenProvider | FactoryProvider;
export declare function stringify(token: any): string;
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