whmcsCrosterTemplates/assets/less/bootstrap/mixins/_box-shadow.less

//@mixin box-shadow($shadow...) {
//  @if $enable-shadows {
//    $result: ();
//
//    @if (length($shadow) == 1) {
//      // We can pass `@include box-shadow(none);`
//      $result: $shadow;
//    } @else {
//      // Filter to avoid invalid properties for example `box-shadow: none, 1px 1px black;`
//      @for $i from 1 through length($shadow) {
//        @if nth($shadow, $i) != "none" {
//          $result: append($result, nth($shadow, $i), "comma");
//        }
//      }
//    }
//    @if (length($result) > 0) {
//      box-shadow: $result;
//    }
//  }
//}
#box-shadow(@shadows...) {
	& when (@enable-shadows) {
		// LESS PORT: Handle cases of single values like `none`.
		& when (length(@shadows) = 1) {
			box-shadow: @shadows;
		}
		// LESS PORT: In order to output the shadows correctly we have to iterate over the list and
		// use Less’s merge feature. Without this, shadows will be output space-separated instead of
		// comma-separated. Also, since a single shadow can be misinterpreted as multiple shadows
		// (since it will have a length > 1) we have to include a check for the length of the first
		// item in the list. If the length is greater than 1, then we have a list of separate shadows.
		// If the the length is 1, then we’re looking at the first value of a single shadow, so we
		// output `@shadows` as-is.
		& when (length(@shadows) > 1) and (length(extract(@shadows, 1)) = 1) {
			// We can pass `@include box-shadow(none);`
			box-shadow: @shadows;
		}
		& when (length(@shadows) > 1) and (length(extract(@shadows, 1)) > 1) {
			each(@shadows, #(@shadow) {
				box-shadow+: @shadow;
			});
		}
	}
}