export declare function newHeadTracker(driver: Connex.Driver): {
    readonly head: {
        id: string;
        number: number;
        timestamp: number;
        parentID: string;
        txsFeatures?: number;
        gasLimit: number;
    };
    readonly progress: number;
    readonly finalized: string;
    ticker: () => {
        next: () => Promise<{
            id: string;
            number: number;
            timestamp: number;
            parentID: string;
            txsFeatures?: number;
            gasLimit: number;
        }>;
    };
};