How to use the broccoli.server function in broccoli

// Make sure we clean-up on exit
  function cleanupAndExit() {
    return watcher.quit();
  }

  process.on('SIGINT', cleanupAndExit);
  process.on('SIGTERM', cleanupAndExit);

  // Sync build directory on build success
  watcher.on('buildSuccess', () => {
    syncBuildFolder(builder, outputDir);
    onSuccess();
  });

  // Start serving!
  broccoli.server.serve(
    watcher,
    '127.0.0.1',
    port || 4300,
    undefined,
    undefined,
    new UI(),
  );

  return watcher;
}

export default function docify(options = {}) {
  let port = options.port || 3000;
  let docsPath = options.src || 'docs';
  let pkgPath = options.pkg || process.cwd();
  let themePath = options.theme
              || fs.existsSync('docs/theme') && 'docs/theme'
              || path.join(__dirname, '../themes/minimal');

  let builder = new broccoli.Builder(docsTree({ docsPath, pkgPath, themePath }));
  let server = broccoli.server.serve(builder, { host: 'localhost', port });

  // Start a livereload server
  let lrserver = tinylr();
  lrserver.listen(35729, () => {
    setTimeout(() => {
      // Trigger a reload on first start
      lrserver.changed({ body: { files: [ 'livereload files' ] } });
    }, 1000);
  });

  // Notify it on changes
  server.watcher.on('change', function() {
    lrserver.changed({ body: { files: [ 'livereload files' ] } });
  });

}