cinny/src/app/partials/_dir.scss

/*
* NOTICE: only use this
* when sides are un-even
* if they are even just use $property: 0 $spacing; 
*/

@mixin side($property, $left, $right) {
  #{$property}: {
    left: $left;
    right: $right;
  };
  
  [dir=rtl] & {
    #{$property}: {
      left: $right;
      right: $left;
    };
  }
}

@mixin prop($property, $ltr, $rtl) {
  #{$property}: $ltr;
  [dir=rtl] & {
    #{$property}: $rtl;
  }
}