/**
 * @license
 * Copyright 2024 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
import { GoogleAuth } from 'google-auth-library';
interface FakeGoogleAuthParams {
    scopes?: string;
    /** Returned from getAccessToken(). */
    accessToken?: string | null;
    /** If provided, will be thrown when getAccessToken() is called. */
    accessTokenError?: Error;
}
/** Fake version of GoogleAuth. */
export declare class FakeGoogleAuth extends GoogleAuth {
    private readonly params;
    constructor(params: FakeGoogleAuthParams);
    getAccessToken(): Promise<string | null | undefined>;
}
/** Creates a fake GoogleAuth for testing. */
export declare function createFakeGoogleAuth(params?: FakeGoogleAuthParams): GoogleAuth;
export {};