/**
 * Cross-Tab Communication Manager
 * Handles communication between main page (with voice agent) and navigation tab
 * Uses BroadcastChannel API for reliable cross-tab messaging
 */
/**
 * Message types for cross-tab communication
 */
export type CrossTabMessageType = 'addToCart' | 'removeFromCart' | 'updateQuantity' | 'navigate' | 'getContext' | 'contextResponse' | 'searchElements' | 'searchElementsResponse' | 'getPageSnapshot' | 'pageSnapshotResponse' | 'clickElement' | 'typeIntoElement' | 'pressKey' | 'focusElement' | 'scrollToElement' | 'domActionResponse';
/**
 * Cross-tab message structure
 */
export interface CrossTabMessage {
    type: CrossTabMessageType;
    payload: any;
    timestamp: number;
    messageId: string;
}
/**
 * Cross-tab communication manager
 * Manages BroadcastChannel for communication between main tab and navigation tab
 *
 * @example
 * ```ts
 * // On main page (with voice agent)
 * const manager = CrossTabManager.getInstance();
 * manager.sendMessage('addToCart', { productId: '123', quantity: 1 });
 *
 * // On navigation tab
 * const manager = CrossTabManager.getInstance();
 * manager.onMessage((message) => {
 *   if (message.type === 'addToCart') {
 *     // Add item to cart
 *   }
 * });
 * ```
 */
export declare class CrossTabManager {
    private static instance;
    private channel;
    private messageHandlers;
    private readonly channelName;
    private constructor();
    /**
     * Get singleton instance
     */
    static getInstance(): CrossTabManager;
    /**
     * Initialize BroadcastChannel
     */
    private initChannel;
    /**
     * Send a message to all tabs
     */
    sendMessage(type: CrossTabMessageType, payload: any): void;
    /**
     * Register a message handler for a specific message type
     *
     * @param type - Message type to listen for
     * @param handler - Callback function
     * @returns Unsubscribe function
     */
    onMessage(type: CrossTabMessageType, handler: (payload: any) => void): () => void;
    /**
     * Register a global message handler (receives all messages)
     *
     * @param handler - Callback function that receives the full message
     * @returns Unsubscribe function
     */
    onAnyMessage(handler: (message: CrossTabMessage) => void): () => void;
    /**
     * Send a request and wait for a response
     * Useful for getting data from the navigation tab
     *
     * @param type - Request message type
     * @param payload - Request payload
     * @param responseType - Expected response message type
     * @param timeout - Timeout in milliseconds (default: 5000)
     * @returns Promise that resolves with response payload
     */
    request(type: CrossTabMessageType, payload: any, responseType: CrossTabMessageType, timeout?: number): Promise<any>;
    /**
     * Close the channel (cleanup)
     */
    close(): void;
    /**
     * Check if BroadcastChannel is supported
     */
    static isSupported(): boolean;
}
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