export declare const SystemTopics: {
    PUBLISH: string;
    CLIENT_READY: string;
    CLIENT: string;
    CLIENT_DISCONNECT: string;
    CLIENT_ERROR: string;
    KEEP_LIVE_TIMEOUT: string;
    ACK: string;
    PING: string;
    CONNACK_SENT: string;
    CLOSED: string;
    CONNECTION_ERROR: string;
    SUBSCRIBES: string;
    UNSUBSCRIBES: string;
    AUTHENTICATE: string;
    PRE_CONNECT: string;
    AUTHORIZE_PUBLISH: string;
    AUTHORIZE_SUBSCRIBE: string;
    AUTHORIZE_FORWARD: string;
    PUBLISHED: string;
    HEART_BEAT: RegExp;
};