anchor.diff:      topLevel = false;
       dependencies = [
         { name = "xml2js"; spec = "0.2.4"; }
  -      { name = "xmlbuilder"; spec = "latest"; }
  +      { name = "xmlbuilder"; spec = "*"; }
       ];
       peerDependencies = [
       ];
  
positive.code:   {
      name = "npm2nix";
      spec = "*";
      version = "3.1.0";
      topLevel = true;
      dependencies = [
        { name = "semver"; spec = ">=2.0.10 <3.0.0"; }
  
negative.code:     topLevel = true;
      dependencies = [
        { name = "xml2js"; spec = "0.2.4"; }
        { name = "xmlbuilder"; spec = "*"; }
      ];
      peerDependencies = [
      ];
  