code: function getContainerScrollbarWidths ( $container, cache ) {
          var containerScrollbarWidths;
  
          if ( cache && cache.containerScrollbarWidths ) {
              containerScrollbarWidths = cache.containerScrollbarWidths;
          } else {
              containerScrollbarWidths = effectiveScrollbarWith( $container );
              if ( cache ) cache.containerScrollbarWidths = containerScrollbarWidths;
          }
  
          return containerScrollbarWidths;
      }
docs: Gets the effective scroll bar widths of a given container. Makes use of caching if a cache object is provided.
  
  @param   {jQuery} $container
  @param   {Object} [cache]
  @returns {Object}