/**
 * Zero-dependency Chrome DevTools Protocol client over Node's global WebSocket.
 *
 * Connects to the browser-level endpoint (ws://127.0.0.1:<port>/devtools/browser/<id>)
 * and uses flattened sessions: page-level commands carry a `sessionId` obtained via
 * Target.attachToTarget({ flatten: true }). No Puppeteer, no npm deps.
 *
 * Adapted from the `chrome-use` skill (skills/chrome-use/scripts/lib/cdp.ts).
 */
import type { CdpClient } from './types.js';
/** Subset of the WHATWG WebSocket the CDP client relies on. */
interface WebSocketLike {
    readyState: number;
    send(data: string): void;
    close(): void;
    addEventListener(type: string, listener: (ev: unknown) => void, opts?: {
        once?: boolean;
    }): void;
}
/** Factory for a WebSocket; injectable for tests. Defaults to global WebSocket. */
export type WebSocketFactory = (url: string) => WebSocketLike;
export declare class Cdp implements CdpClient {
    private readonly ws;
    private nextId;
    private readonly pending;
    private readonly listeners;
    private readonly openPromise;
    private isClosed;
    private constructor();
    /** Connect to a browser-level ws endpoint and resolve once the socket is open. */
    static connect(wsEndpoint: string, timeoutMs?: number, wsFactory?: WebSocketFactory): Promise<Cdp>;
    get connected(): boolean;
    private onMessage;
    send<T = unknown>(method: string, params?: Record<string, unknown>, sessionId?: string): Promise<T>;
    on(method: string, handler: (params: unknown, sessionId?: string) => void): () => void;
    close(): void;
}
export {};
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