import { BroadcasterBridge } from "./Bridge";
/**
 * **BroadcastChannel Bridge: Serverless browsing context bridge**
 *
 * Communicates with other Broadcaster instances via
 * [BroadcastChannel API](https://developer.mozilla.org/en-US/docs/Web/API/Broadcast_Channel_API).
 *
 * BroadcastChannel API allows to communicate with different browsing contexts inside a browser
 * (tabs, window, workers, etc..) without need of a server.
 *
 * ____
 *
 * Minimal requirements:
 *
 * | Chromium | Edge | Safari | Firefox |
 * |:--------:|:----:|:------:|:-------:|
 * |    54    |  79  |  15.4  |    38   |
 */
export declare class BroadcastChannelBridge<Payload, Metadata> extends BroadcasterBridge<Payload, Metadata> {
    /**
     * Instance of BroadcastChannel API.
     */
    private messageChannel;
    /**
     * Channel used as identifier for communication
     */
    private channelName;
    /**
     * Connects to a BroadcasterChannel stream
     *
     * @param channelName communication identifier
     */
    connect(channelName: string): void;
    protected disconnect(): void;
    /**
     * Sort incoming messages and push it to corresponding stream
     *
     * @param event BroadcasterChannel Event
     */
    private extractMessageAndPush;
    /**
     * Wraps action to try catch, and in case of an error,
     * it will transform it to BroadcastError and push it to subscribers
     *
     * @param action callback action, which will be called inside try scope
     */
    private guardPostMessageErrors;
    /**
     * Incoming message is a valid BroadcastChannelBridge message
     *
     * @param data
     * @returns
     */
    private isMessage;
    /**
     * A BroadcasterChannel message is a public message
     *
     * @param data
     * @returns
     */
    private isPublicMessage;
    /**
     * A BroadcasterChannel message is a state change message
     *
     * @param data
     * @returns
     */
    private isStateChangeMessage;
    /**
     * Sends public message to all BroadcasterChannelBridge instances
     *
     * @param payload
     */
    postMessage(payload: Payload): void;
    /**
     * Sends new state of this instance to all BroadcasterChannelBridge instances
     *
     * @param payload
     */
    setState(payload: Metadata): void;
}