import { Theme } from '../types';
export declare const COLOR_TYPES: string[];
/**
 * 获取颜色相关的属性
 *
 * @param {object} props
 */
export declare const cloneColorProps: (props: object) => {};
/**
 * 获取排除掉颜色相关属性的属性对象
 *
 * @param {object} props
 */
export declare const extraColorProps: (props: object) => {
    color: string;
};
/**
 * 获取props中是否不包含颜色类型
 */
export declare function isEmptyOfColorType(props: {
    color: string | boolean;
    colorType: string;
}): boolean;
/**
 * 获取主题中的颜色
 *
 * @param {*} props
 */
export declare function getColorFromTheme(props: {
    color?: string;
    disabled?: boolean;
    theme?: Theme;
}, defaultColor?: string): string;
export declare const colorCss: (props: {
    color?: string;
}, defaultColor?: string) => import("styled-components").InterpolationValue[];
/**
 * 获取两个颜色之间的对比度。
 *
 * 公式: https://www.w3.org/TR/WCAG20-TECHS/G17.html#G17-tests
 *
 * @param {string} foreground
 *              - 颜色值，比如: #nnn, #nnnnnn, rgb(), rgba(), hsl(), hsla()
 * @param {string} background
 *              - 颜色值，比如: #nnn, #nnnnnn, rgb(), rgba(), hsl(), hsla()
 * @returns {number} 0 - 21之间的对比度。
 */
export declare function getContrastRatio(foreground: string, background: string): number;