declare class DataService {
    private dataDir;
    private dataFile;
    private data;
    constructor();
    private loadData;
    private saveData;
    getVips(): any[];
    addVip(vip: any): any;
    updateVip(id: string, updatedVip: any): any | null;
    deleteVip(id: string): any | null;
    getDrivers(): any[];
    addDriver(driver: any): any;
    updateDriver(id: string, updatedDriver: any): any | null;
    deleteDriver(id: string): any | null;
    getSchedule(vipId: string): any[];
    addScheduleEvent(vipId: string, event: any): any;
    updateScheduleEvent(vipId: string, eventId: string, updatedEvent: any): any | null;
    deleteScheduleEvent(vipId: string, eventId: string): any | null;
    getAllSchedules(): {
        [vipId: string]: any[];
    };
    getAdminSettings(): any;
    updateAdminSettings(settings: any): void;
    createBackup(): string;
    getUsers(): any[];
    getUserByEmail(email: string): any | null;
    getUserById(id: string): any | null;
    addUser(user: any): any;
    updateUser(email: string, updatedUser: any): any | null;
    updateUserRole(email: string, role: string): any | null;
    updateUserLastSignIn(email: string): any | null;
    deleteUser(email: string): any | null;
    getUserCount(): number;
    getDataStats(): any;
}
declare const _default: DataService;
export default _default;
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