/**
 * Represents a date range, from startDate to endDate.
 * Note that a date range can be open-ended on either side.
 */
export declare class DateRange {
    startDate: (string | null);
    endDate: (string | null);
    get dayCount(): number;
    constructor();
    constructor(_startDate: string);
    constructor(_startDate: string, _endDate: string);
    constructor(_startDate: string, _dayCount: number);
    isInside(dateId: string): boolean;
    isOutside(dateId: string): boolean;
    toString(): string;
    clone(): DateRange;
    static clone(obj: any): DateRange;
}