import { EventEmitter } from 'events';
export interface ProxyRequest {
    id: string;
    method: string;
    url: string;
    headers: Record<string, string>;
    body?: string;
}
export interface ProxyResponse {
    status: number;
    headers: Record<string, string>;
    body: any;
}
export declare class PostMessageClient extends EventEmitter {
    private targetUrl;
    private pendingRequests;
    private connected;
    private tabConnected;
    constructor(targetUrl: string);
    connect(): Promise<void>;
    /**
     * Try to connect to existing browser tab via BroadcastChannel
     */
    private tryConnectToExistingTab;
    sendRequest(request: ProxyRequest): Promise<ProxyResponse>;
    isConnected(): boolean;
    disconnect(): void;
    /**
     * Send command completion signal to browser
     */
    sendCommandComplete(): Promise<void>;
}
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