/**
 * Notification utility for alerting the user when the TUI needs attention.
 * Sends a terminal bell and optionally a native OS notification.
 */
import type { HookManager } from '../hooks/manager.js';
export type NotificationMode = 'bell' | 'system' | 'both' | 'off';
export type NotificationReason = 'agent_done' | 'ask_question' | 'tool_approval' | 'plan_approval' | 'sandbox_access';
/**
 * Send a notification to the user.
 * - "bell": writes \x07 to stdout (terminal bell)
 * - "system": sends a native OS notification (macOS only for now)
 * - "both": bell + system
 * - "off": no-op
 *
 * Also fires Notification hooks if a hookManager is provided.
 */
export declare function sendNotification(reason: NotificationReason, opts: {
    mode: NotificationMode;
    message?: string;
    hookManager?: HookManager;
}): void;
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