HEXAtoHSLA

function RGBToHSL(HEXA, invert=false) {
   let [r,g,b,a]=HEXA.replace(/^#?(?:(?:(..)(..)(..)(..)?)|(?:(.)(.)(.)(.)?))$/, '$1$5$5$2$6$6$3$7$7$4$8$8').match(/(..)/g).map(rgb=>parseInt('0x'+rgb)/255),
       cmin = Math.min(r,g,b),
       cmax = Math.max(r,g,b),
       delta = cmax - cmin,
       h = 0,
       s = 0,
       l = 0
       i = invert? -100 : 0;

  if      (!delta)    h = 0;
  else if (cmax == r) h = ~~((((g - b) / delta) % 6) * 60);
  else if (cmax == g) h = ~~((((b - r) / delta) + 2) * 60);
  else                h = ~~((((r - g) / delta) + 4) * 60);
  h = (h<0) ? h+360 : h;

  l = (cmax + cmin) / 2;

  s = delta == 0 ? 0 : delta / (1 - Math.abs(2 * l - 1));
    
  s = +(s * 100).toFixed(1);
  l = +(l * 100).toFixed(1);

  return "hsl(" + h + "," + s + "%," + Math.abs(i + l) + "%)";
}