Webpack bundle generator functions

1_without.js

import Header from './components/header';
import TeamCity from 'promise!./services/teamcity';

Promise.all([TeamCity]).then(function(TeamCity) {
    // module code
});

2_with.js

import Header from './components/header';
import TeamCity from 'promise!./services/teamcity';

// module code

3_transformed.js

co(function* () {
  var Header = require('./components/header');
  var TeamCity = yield require('promise!./services/teamcity'); // promise! loader was detected then add yield
  
  // module code
});