export type NotificationCallback = (error: Error | null, response: string) => void;
export interface Notification {
    /** deliver even when HEROKU_NOTIFICATIONS is disabled */
    force?: boolean;
    /** absolute path to an icon (Linux only) */
    icon?: string;
    /** body text of the notification */
    message?: string;
    /** play a sound with the notification */
    sound?: boolean | string;
    /** secondary text shown below the title (macOS only) */
    subtitle?: string;
    /** main title; defaults to "Heroku CLI" */
    title?: string;
}
/**
 * Display a desktop notification using the host OS's native tooling
 * (osascript on macOS, notify-send on Linux, PowerShell toast on Windows).
 *
 * Best-effort and fire-and-forget: any failure (missing tool, unsupported
 * platform) is swallowed so callers never see a notification break a command.
 */
export declare function notify(notification?: Notification, callback?: NotificationCallback): void;