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Edit File: adjustHue.js.flow

// @flow
import parseToHsl from './parseToHsl'
import toColorString from './toColorString'
import curry from '../internalHelpers/_curry'

/**
 * Changes the hue of the color. Hue is a number between 0 to 360. The first
 * argument for adjustHue is the amount of degrees the color is rotated around
 * the color wheel, always producing a positive hue value.
 *
 * @example
 * // Styles as object usage
 * const styles = {
 *   background: adjustHue(180, '#448'),
 *   background: adjustHue('180', 'rgba(101,100,205,0.7)'),
 * }
 *
 * // styled-components usage
 * const div = styled.div`
 *   background: ${adjustHue(180, '#448')};
 *   background: ${adjustHue('180', 'rgba(101,100,205,0.7)')};
 * `
 *
 * // CSS in JS Output
 * element {
 *   background: "#888844";
 *   background: "rgba(136,136,68,0.7)";
 * }
 */
function adjustHue(degree: number | string, color: string): string {
  if (color === 'transparent') return color
  const hslColor = parseToHsl(color)
  return toColorString({
    ...hslColor,
    hue: hslColor.hue + parseFloat(degree),
  })
}

// prettier-ignore
const curriedAdjustHue = curry/* ::<number | string, string, string> */(adjustHue)
export default curriedAdjustHue