export declare class FronteggIdleSessionHelper extends HTMLElement {
    appUrl: string | null;
    events: string[];
    postMessageId: string;
    constructor();
    sendPostMessage(): void;
    addEventListeners(): void;
    removeEventListeners(): void;
    connectedCallback(): void;
    disconnectedCallback(): void;
    attributeChangedCallback(name: string, oldValue: string, newValue: string): void;
}