import { type BackgroundMessage, type ContentScriptMessage } from './internal_message_types.js';
/**
 * Transport interface for content script communication.
 */
export interface ContentScriptTransport {
    /**
     * Send a message to the background script.
     * Typically `browser.runtime.sendMessage`.
     */
    sendToBackground: (message: ContentScriptMessage) => void;
    /**
     * Register a listener for messages from the background script.
     * Typically `browser.runtime.onMessage.addListener`.
     */
    addBackgroundListener: (handler: (message: BackgroundMessage) => void) => void;
}
/**
 * Handles wallet connection flow in the extension content script.
 *
 * This class manages:
 * - Listening for discovery requests from the page
 * - Creating MessageChannels after discovery approval
 * - Relaying key exchange messages between page and background
 * - Relaying encrypted messages between page and background
 *
 * The content script acts as a pure relay - it never has access to
 * private keys or shared secrets.
 *
 * @example
 * ```typescript
 * const handler = new ContentScriptConnectionHandler({
 *   sendToBackground: (message) => browser.runtime.sendMessage(message),
 *   addBackgroundListener: (handler) => browser.runtime.onMessage.addListener(handler),
 * });
 *
 * handler.start();
 * ```
 */
export declare class ContentScriptConnectionHandler {
    private transport;
    private ports;
    private listening;
    private pageMessageHandler;
    constructor(transport: ContentScriptTransport);
    start(): void;
    private handleBackgroundMessage;
    private handlePong;
    private handleDiscoveryRequest;
    private handleDiscoveryApproved;
    private handleKeyExchangeResponse;
    private handleSecureResponse;
    private handleSessionDisconnected;
    closeConnection(sessionId: string): void;
    closeAllConnections(): void;
    getConnectionCount(): number;
}
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