old_contents: import ApibNode from './apib-node';
  import ResourceGroupNode from './resource-group-node';
  import ModelGroupNode from './model-group-node';
  
  export default class PackageNode extends ApibNode {
    static acceptableNodes = [PackageNode, ResourceGroupNode, ModelGroupNode];
  
    static canAcceptHeader(header) {
      return ApibNode.headerRegex.test(header);
    }
  }
  
new_contents: import ApibNode from './apib-node';
  import ResourceGroupNode from './resource-group-node';
  import ModelGroupNode from './model-group-node';
  import ResourceNode from './resource-node';
  
  export default class PackageNode extends ApibNode {
    static acceptableNodes = [PackageNode, ResourceGroupNode, ModelGroupNode, ResourceNode];
  
    static canAcceptHeader(header) {
      return ApibNode.headerRegex.test(header);
    }
  }
  
subject: include ResourceNoe as a possible child node