import { TrackExtras, TrackResponse, ClientRequest } from './types';
/**
 * The Pintail client.
 */
export declare class Client {
    /**
     * The base URL for the Pintail API.
     */
    private baseUrl;
    /**
     * The constructor.
     *
     * @param baseUrl The base URL for the Pintail API. Defaults to 'https://event.pintail.io/v2'.
     */
    constructor(baseUrl?: string);
    /**
     * Track an event.
     *
     * This method never throws. Any transport, serialization, timeout, or
     * server-side failure is surfaced via `console.warn` and reported back as
     * `{ success: false }`.
     *
     * In the browser, the request is preferentially dispatched via
     * `navigator.sendBeacon`, which survives page unload and is rarely blocked
     * by corporate proxies or extensions. When sendBeacon is unavailable or
     * refuses the payload, the call falls back to `fetch` with a 5-second
     * timeout and a CORS-safelisted `text/plain` content type so the request
     * does not trigger an `OPTIONS` preflight.
     *
     * @param codename The codename of the event to track.
     * @param extras The extras to track. Defaults to an empty object.
     * @param req The client request. Defaults to null.
     * @returns The response from the Pintail API. When `sendBeacon` is used,
     *   `{ success: true }` reflects a successful enqueue rather than a server
     *   acknowledgement.
     */
    track: (codename: string, extras?: TrackExtras, req?: ClientRequest | null) => Promise<TrackResponse>;
}
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