/**
 * Web Push notification manager — VAPID key management, subscription storage,
 * and notification dispatch.
 *
 * Subscriptions stored in ~/.cumulus/push-subscriptions.json.
 * VAPID keys stored in gateway.config.json under "vapid".
 */
export interface VapidConfig {
    publicKey: string;
    privateKey: string;
    email: string;
}
export interface StoredSubscription {
    endpoint: string;
    keys: {
        p256dh: string;
        auth: string;
    };
    /** When the subscription was registered */
    createdAt: string;
    /** Optional label (e.g., "iPhone", "Desktop Chrome") */
    label?: string;
}
/**
 * Generate a new VAPID key pair. Call once on first startup,
 * then store in gateway config.
 */
export declare function generateVapidKeys(): {
    publicKey: string;
    privateKey: string;
};
/**
 * Configure web-push with VAPID details. Must be called before sending.
 */
export declare function configureVapid(vapid: VapidConfig): void;
/**
 * Add a push subscription. Deduplicates by endpoint.
 */
export declare function subscribe(sub: StoredSubscription): void;
/**
 * Remove a push subscription by endpoint.
 */
export declare function unsubscribe(endpoint: string): boolean;
/**
 * Get all stored subscriptions.
 */
export declare function getSubscriptions(): StoredSubscription[];
export interface NotificationPayload {
    title: string;
    body: string;
    /** Thread name for deep linking */
    threadName?: string;
    /** Notification priority: maps to push urgency header */
    priority?: 'low' | 'normal' | 'high';
    /** Optional icon URL */
    icon?: string;
    /** Optional tag for collapsing (same tag = replace previous) */
    tag?: string;
}
/**
 * Send a push notification to all stored subscriptions.
 * Automatically removes expired/invalid subscriptions (410 Gone).
 * Returns number of successful deliveries.
 */
export declare function sendNotification(payload: NotificationPayload): Promise<number>;
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