code: def run_npm(self):
          
  
          for name, version in npm_dependencies.items():
              # packages are installed globally to make sure that they are
              # installed in the virtualenv rather than the current directory.
              # it is also necessary for packages containing scripts, e.g. less
              dep_name = '%s@%s' % (name, version)
              self.run_cmd(['npm', 'install', '-g', dep_name])
docs: h/t https://github.com/elbaschid/virtual-node/blob/master/setup.py