////
/// @group helpers/typography
////

@use "sass:math";

/// Convert line-heights specified in pixels into a relative value, unless
/// they are already unit-less (and thus already treated as relative values)
/// or the units do not match the units used for the font size.
///
/// @param {Number} $line-height Line height
/// @param {Number} $font-size Font size
/// @return {Number} The line height as either a relative value or unmodified
///
/// @access private

@function line-height($line-height, $font-size) {
  @if not math.is-unitless($line-height) and math.unit($line-height) == math.unit($font-size) {
    $line-height: math.div($line-height, $font-size);
  }

  @return $line-height;
}