export declare class NotificationHandlerService<T> {
    private _notificationMap;
    getNotificationNumber(): number;
    getNotifications(): Array<T>;
    push(item: T): string;
    remove(item: T): void;
    pushAll(itens: Array<T>): Array<string>;
    removeById(id: string): void;
    hasItemById(id: string): boolean;
    hasItem(item: T): boolean;
    getById(id: string): T;
}