/**
 * @author yomeeliu
 */
export declare function mergeProps<A, B>(a: A, b: B): B & A;
export declare function mergeProps<A, B, C>(a: A, b: B, c: C): C & B & A;
/**
 * @author yomeeliu
 * 计算指定颜色的明度
 *
 * *返回 [0-1] 间的某个值*
 *
 * @link https://github.com/mattdesl/color-luminance/blob/master/index.js
 */
export declare function calculateLuminance(color: string): number;
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