def install_jspackage(package_name, version, modulesdir):
    """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.
    """
    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))
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.