/** Base class of requests, responses, and events. */
    interface ProtocolMessage {
        /** Sequence number */
        seq: number;
        /** One of "request", "response", or "event" */
        type: string;
    }
    /** Client-initiated request */
    interface Request extends ProtocolMessage {
        /** The command to execute */
        command: string;
        /** Object containing arguments for the command */
        arguments?: any;
    }