/**
 * Convert RGBA color values to HSLA color space
 * @param rgba Object containing r, g, b values (0-255) and optional a (0-1)
 * @returns {Object} HSLA values (h as 0-360, s and l as 0-100, a as 0-1)
 * @example rgbaToHsla({ r: 100, g: 100, b: 100, a: 1 }); // { h: 0, s: 0, l: 39.22, a: 1 }
 */
export declare const rgbaToHsla: ({ r, g, b, a, }: {
    r: number;
    g: number;
    b: number;
    a?: number;
}) => {
    h: number;
    s: number;
    l: number;
    a: number;
};