code: function(path) {
              if (!path.inList) {
                return;
              }
  
              const { node } = path;
  
              let sibling = path.getSibling(path.key + 1);
  
              let declarations = [];
  
              while (sibling.isVariableDeclaration({ kind: node.kind })) {
                declarations = declarations.concat(sibling.node.declarations);
  
                sibling.remove();
  
                sibling = path.getSibling(path.key + 1);
              }
  
              if (declarations.length > 0) {
                path.replaceWith(
                  t.variableDeclaration(node.kind, [
                    ...node.declarations,
                    ...declarations
                  ])
                );
              }
            }
docs: concat variables of the same kind with their siblings