/**
 * OAuth Helper - Streamlines Gmail API credential setup
 * Provides automated guidance and credential handling
 */
export declare class OAuthHelper {
    private readonly OAUTH_SCOPES;
    setupOAuth(serverPath: string): Promise<void>;
    private quickSetup;
    private secureSetup;
    private manualSetup;
    private runAuthorization;
    /**
     * Alternative method: Download credentials directly from URL
     * This could be used if you host a credentials file
     */
    downloadCredentials(serverPath: string, url: string): Promise<void>;
}