Function complement

src/color/complement.js:27–34

(color: string)

 * }
 */
export default function complement(color: string): string {
  if (color === 'transparent') return color
  const hslColor = parseToHsl(color)
  return toColorString({
    ...hslColor,
    hue: (hslColor.hue + 180) % 360,
  })
}