/**
 * @module botframework-connector
 */
/**
 * Copyright (c) Microsoft Corporation. All rights reserved.
 * Licensed under the MIT License.
 */
import * as adal from 'adal-node';
import { AppCredentials } from './appCredentials';
/**
 * CertificateAppCredentials auth implementation
 */
export declare class CertificateAppCredentials extends AppCredentials {
    certificateThumbprint: string;
    certificatePrivateKey: string;
    /**
     * Initializes a new instance of the [CertificateAppCredentials](xref:botframework-connector.CertificateAppCredentials) class.
     *
     * @param appId Microsoft application Id related to the certificate.
     * @param certificateThumbprint A hex encoded thumbprint of the certificate.
     * @param certificatePrivateKey A PEM encoded certificate private key.
     * @param channelAuthTenant Optional. The oauth token tenant.
     * @param oAuthScope Optional. The scope for the token.
     */
    constructor(appId: string, certificateThumbprint: string, certificatePrivateKey: string, channelAuthTenant?: string, oAuthScope?: string);
    protected refreshToken(): Promise<adal.TokenResponse>;
}
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