export declare function getRGBFromHexa(hex: string, transparency?: number): {
    r: number;
    g: number;
    b: number;
    a: number;
} | {
    r: number;
    g: number;
    b: number;
    a?: undefined;
};
export declare function getRGBAStyle(rgba: {
    r: number | string;
    g: number | string;
    b: number | string;
    a?: number | string;
}): string;
export declare function getColorBrightness(r: number, g: number, b: number): number;
export declare function capitalizeFirstLetter(stringChar: any): any;
export declare function isInDateRange(day: any, from: any, to: any): boolean;
export declare function yyyymmdd(date: Date): string;