@function contrast($name) {
  $color: color($name);
  
  @if (lightness($color) >= 50) {
    @return color(black);
  } @else {
    @return color(white);
  }
}
/// Given a Rocketbelt palette color, returns the closest contrasting color (black or white).
///
/// @author Chancellor Clark
///
/// @param $name - The palette family & variant to contrast with.
/// @param $digits [0] - The number of digits to round to.
/// @param $mode [round] - "round", "ceil", or "floor".
///
/// @example scss - contrast function
///   contrast('primary, lightest')
///   // color(white)
@function contrast($name) {
  $color: color($name);

  @if (lightness($color) >= 50) {
    @return color(black);
  } @else {
    @return color(white);
  }
}

Add Sassdoc comments for contrast function.
docs(Tools): Add Sassdoc comments for contrast function.
