code: function _resolveNodeSize(node) {
          var localItemSize = itemSize;
          if (getItemSize) {
              localItemSize = getItemSize(node.renderNode, size);
          }
          if ((localItemSize[0] === true) || (localItemSize[1] === true)) {
              var result = context.resolveSize(node, size);
              if (localItemSize[0] !== true) {
                  result[0] = itemSize[0];
              }
              if (localItemSize[1] !== true) {
                  result[1] = itemSize[1];
              }
              return result;
          }
          else {
              return localItemSize;
          }
      }
docs: Helper function to resolving the size of a node.