export declare class Util {
    static round2(num: number): number;
    static num2hex(num: number): string;
    static hexToRgbArray(hex: string): number[];
    static normalizeRgbArray(rgbArray: number[]): number[];
    static rgbArrayToHex(rgbArray: number[]): string;
    static firstUpper(s: string): string;
    static formatDateTimeSeconds(d: number): string;
    static formatNow(): string;
}