import type { IRGB } from './interfaces';
/**
 * Converts a valid CSS color string to an RGB color.
 * Note that hex colors *must* be prefixed with # to be considered valid.
 * Alpha in returned color defaults to 100.
 * Four and eight digit hex values (with alpha) are supported if the current browser supports them.
 */
export declare function cssColor(color?: string, doc?: Document): IRGB | undefined;