export interface NotifierMessagePayload {
    subject: string;
    body: string;
    cta?: string;
    ctaLink?: string;
}
export declare abstract class Notifier {
    from: string;
    messageLimit: number;
    /**
     * Generate the notification via `buildNotification` and store it
     * Also check if there are any notifications to remove with `pruneNotifications`
     */
    run(): Promise<void>;
    /**
     * Generate the notification to store (or null)
     */
    abstract buildNotification(): Promise<NotifierMessagePayload>;
    storeOrUpdateNotification(notificationPayload: NotifierMessagePayload): Promise<void>;
    /**
     * Remove all notifications from this notifier
     */
    clearNotifications(): Promise<number>;
    pruneNotifications(): Promise<void>;
}