lib/functions/lightness.js
function lightness(color, value){
  if (value) {
    var hslaColor = color.hsla;
    return hsla(
      new nodes.Unit(hslaColor.h),
      new nodes.Unit(hslaColor.s),
      value,
      new nodes.Unit(hslaColor.a)
    )
  }
  return component(color, new nodes.String('lightness'));
}
function lightness(color, value){
  if (value) {
    var hslaColor = color.hsla;
    return hsla(
      new nodes.Unit(hslaColor.h),
      new nodes.Unit(hslaColor.s),
      value,
      new nodes.Unit(hslaColor.a)
    )
  }
  return component(color, new nodes.String('lightness'));
}
function lightness ( color , value ) { if ( value ) { var hslaColor = color . hsla ; return hsla ( new nodes . Unit ( hslaColor . h ) , new nodes . Unit ( hslaColor . s ) , value , new nodes . Unit ( hslaColor . a ) ) } return component ( color , new nodes . String ( 'lightness' ) ) ; }
Return the lightness component of the given `color`,
or set the lightness component to the optional second `value` argument.

Examples:

lightness(#00c)
// => 100%

lightness(#00c, 80%)
// => #99f

@param {RGBA|HSLA} color
@param {Unit} [value]
@return {Unit|RGBA}
@api public
Return the lightness component of the given color or set the lightness component to the optional second value argument .