@function kf-stagger($stagger-duration, $list-of-animations...) {
  $i: 0;
  $return-animation: null;

  @each $animation in $list-of-animations {
    @if $i == 0 {
      $return-animation: $animation;
    } @else {
      $old-duration: _calculate_animation_length($return-animation);
      $return-animation: kf-parallel(
        $return-animation,
        kf-lead($old-duration + $stagger-duration, $animation)
      );
    }
    $i: $i + 1;
  }

  @return $return-animation;
}

@mixin kf-stagger($m...) {
  @include kf(kf-stagger($m...));
}