export declare function toRGBA(color: string | {
    red: number;
    green: number;
    blue: number;
    alpha?: number;
} | [number, number, number]): {
    red: number;
    green: number;
    blue: number;
    alpha: number;
};
/**
 * Determine best text color for a background color
 *
 * Uses the WCAG contrast formula to mathematically determine whether black or white provides the most contrast
 * with the given color.
 */
export declare function shouldUseWhiteText(color: string | {
    red: number;
    green: number;
    blue: number;
} | [number, number, number]): boolean;