type TunnelClientOptions = {
    /** Public relay base URL, e.g. `https://my-relay.ondigitalocean.app`. */
    relayUrl: string;
    /** Shared secret matching the relay's token. */
    token: string;
    /** Local app origin to replay requests against, e.g. `http://localhost:3000`. */
    localOrigin: string;
    /** Called once the relay confirms the public URL is live. */
    onReady?: (publicUrl: string) => void;
};
/**
 * Start the dev-side tunnel client. Dials the relay's control socket and
 * replays each forwarded request against the local app, streaming responses
 * back. Auto-reconnects so an HMR restart or a relay blip self-heals.
 */
export declare const startTunnelClient: (options: TunnelClientOptions) => {
    publicUrl: string;
    close(): void;
};
export {};