/**
 * Clear all results from task table
 * @param serviceName - Optional. If provided, only results for this service will be cleared.  If not provided, all results will be cleared.
 */
export declare function deleteTasks(projectName: string, region: string, serviceName?: string, options?: {
    /** Time in milliseconds to wait after each batch deleted, helps avoid throttling */
    waitTime?: number;
}): Promise<void>;