import { IRootIncomingMessageEnvelope, IRootMessagingProvider, IRootOutgoingMessageEnvelope } from '../contracts.js';
/**
 * A getAgent standard compliant root messaging publisher
 * Listens for new app connections established with WCP Hello message
 * Generates a connection ID for each app that connects
 * Creates a MessageChannel for each app and maps it to the connection id
 */
export declare class DefaultRootMessagingProvider implements IRootMessagingProvider {
    private messageChannelFactory?;
    private callbacks;
    private messageChannels;
    constructor(windowRef: Window, messageChannelFactory?: (() => MessageChannel) | undefined);
    /**
     * posts the provided message on the corresponding message channel for each channel id passed in the message envelope
     * @param message
     */
    publish(message: IRootOutgoingMessageEnvelope): void;
    subscribe(callback: (message: IRootIncomingMessageEnvelope) => void): void;
    /**
     * responds to hello messages from proxy agents that are trying to establish communication
     * for each hello message received a new channelId is generated and a corresponding Message channel
     * one port is returned to the source app. The other is added to the lookup with the channel id as the key
     * @param message
     */
    private onWindowMessage;
}