/**
 * [[PingPongObserver]] implements callbacks for when [[PingPong]] pongs are
 * received or missed.
 */
export default interface PingPongObserver {
    /**
     * Called when a pong is received with the measured latency from the ping as
     * well as an estimate of the local clock skew compared to the server clock.
     */
    didReceivePong?(id: number, latencyMs: number, clockSkewMs: number): void;
    /**
     * Called when one or more pongs are missed in a row. This can be an
     * indication that the underlying connection has failed.
     */
    didMissPongs?(consecutiveMissed: number): void;
}