Yes. You can use @if and @else
=opacity($opacity, $important: no) @if $important == isImportant opacity: $opacity !important $opacity-ie: $opacity * 100 filter: alpha(opacity=$opacity-ie) !important //IE8 @else opacity: $opacity $opacity-ie: $opacity * 100 filter: alpha(opacity=$opacity-ie) //IE8 .some-class +opacity(1) // without !important .some-class +opacity(1, isImportant) // with !important
if that's what it means
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