code: def install_jspackage(package_name, version, modulesdir):
      
      if not version:
          version = ''
  
      requirements = _resolve_dependencies(package_name, version)
      print('Packages going to be installed: {0}'.format(', '.join(
          '{0}->{1}'.format(*i) for i in requirements
      )))
  
      downloads = {}
      for dependency_name, _, version_info in requirements:
          try:
              downloads[dependency_name] = version_info['dist']['tarball']
          except KeyError:
              raise JSPackageInstallError('Unable to detect a supported download url for package',
                                          error_code=3)
  
      for dependency_name, download_url in downloads.items():
          tarball = BytesIO()
          print('Fetching {0}'.format(download_url), end='')
          with closing(urlopen(download_url)) as data:
              chunk = data.read(1024)
              while chunk:
                  print('.', end='')
                  tarball.write(chunk)
                  chunk = data.read(1024)
          print('')
  
          tarball.seek(0)
          with closing(tarfile.open(fileobj=tarball)) as tb:
              dest = os.path.join(modulesdir, dependency_name)
              tmpdir = tempfile.mkdtemp()
              try:
                  tb.extractall(tmpdir)
                  shutil.rmtree(os.path.abspath(dest), ignore_errors=True)
                  shutil.move(os.path.join(tmpdir, 'package'),
                              os.path.abspath(dest))
              finally:
                  shutil.rmtree(tmpdir)
  
      print('Installing {0} in {1} Done!'.format(package_name, modulesdir))
docs: Installs a JavaScript package downloaded from npmjs.org.
  
      For example to install React::
  
          install_jspackage('react', '0.14.8', './node_modules')
  
      To install last version provide `None` as the version.