export declare const PUB_SUB_DEFAULT_RETRY_CODES: number[];
export declare const PUB_SUB_DEFAULT_BACKOFF_SETTINGS: {
    initialRetryDelayMillis: number;
    retryDelayMultiplier: number;
    maxRetryDelayMillis: number;
    initialRpcTimeoutMillis: number;
    rpcTimeoutMultiplier: number;
    maxRpcTimeoutMillis: number;
    totalTimeoutMillis: number;
};
export declare const MESSAGE = "message";
export declare const ERROR = "error";
export declare const CLOSE = "close";