How to use the @kadira/storybook.getStorybook function in @kadira/storybook

async function main() {
  try {
    // Channel for addons is created by storybook manager from the client side.
    // We need to polyfill it for the server side.
    const addons = require('@kadira/storybook-addons').default;
    const channel = new EventEmitter();
    addons.setChannel(channel);

    const content = babel.transformFileSync(configPath, babelConfig).code;
    const contextOpts = {
      filename: configPath,
      dirname: path.resolve(configDir),
    };
    runWithRequireContext(content, contextOpts);
    const storybook = require('@kadira/storybook').getStorybook();
    const result = await runner.run(filterStorybook(storybook, grep, exclude));
    const fails = result.errored + result.unmatched;
    const exitCode = fails > 0 ? 1: 0;
    if(!program.watch){
      process.exit(exitCode);
    }
  } catch (e) {
    console.log(e.stack || e);

    if(!program.watch){
      process.exit(1);
    }
  }
}

global.navigator.userAgent = 'screener';

  // Channel for addons is created by storybook manager from the client side.
  // We need to polyfill it for the server side.
  var addons = require('@kadira/storybook-addons').default;
  var channel = new EventEmitter();
  addons.setChannel(channel);

  var content = babel.transformFileSync(configPath, babelConfig).code;
  var contextOpts = {
    filename: configPath,
    dirname: path.resolve(configDir),
  };
  try {
    runWithRequireContext(content, contextOpts);
    var storybook = require('@kadira/storybook').getStorybook();
    callback(null, storybook);
  } catch(ex) {
    if (!options || !options.port) return callback(ex);
    // Exception may be caused by global dependencies injected into browser's Window object.
    // We are not running through an actual browser, so try JSDom.
    var jsdom = require('jsdom');
    var request = require('request');
    // try to retrieve preview bundle from local storybook server
    request.get('http://localhost:' + options.port + '/static/preview.bundle.js', function(err, response, body) {
      if (err || response.statusCode != 200 || !body) return callback(ex);
      if (options.debug && ex.stack) {
        console.log('DEBUG:', ex.stack);
      } else {
        console.log(ex.message || ex.toString());
      }
      console.log('Retrying...');