import { MessageBase } from './commands/MessageBase';
declare class MessagingService {
    static sharedInstance: MessagingService;
    private childrenWithMessaging_;
    private initialized_;
    private onChildrenReady_;
    initialize(): void;
    /**
     * Sends a message to a child iframe.
     * Note: If multiple iframes have the same src (ie if the same Story is present more than once),
     * the same message will be sent to all of them.
     */
    sendMessageToChild<T extends MessageBase<unknown>>(iframe: HTMLIFrameElement, message: T): void;
    sendMessageToParent<T extends MessageBase<unknown>>(message: T): void;
    private sendMessageCore;
    private handleMessage;
}
declare const _default: MessagingService;
export default _default;