File: public/asset/vendor/select2/docs/themes/learn2/scss/vendor/color-schemer/color-schemer/_comparison.scss

//////////////////////////////
// Color Is Dark
//
// Checks to see if the input color is a dark color taking into account both lightness and hue.
// Suitable for determining, for instance, if a background should have a dark or light text color.
//   @return true/false (boolean)
//////////////////////////////

@function cs-is-dark($color) {
  @if (lightness($color) < 60% and (hue($color) >= 210 or hue($color) <= 27)) or (lightness($color) <= 32%)  {
    @return true;
  } @else {
    @return false;
  }
}