old_contents: import "bootstrap/dist/css/bootstrap.min"
  import "font-awesome/css/font-awesome.min"
  import "./style/style.default"
  import "./style"
  import FontFaceObserver from 'fontfaceobserver'
  
  const font = new FontFaceObserver('Open Sans')
  font.load().then(console.log('Open Sans loaded!'))
  
  import App from './components/App'
  
  export default () => <App />;
  
new_contents: import "bootstrap/dist/css/bootstrap.min"
  import "font-awesome/css/font-awesome.min"
  import "./style/style.default"
  import "./style"
  import FontFaceObserver from 'fontfaceobserver'
  
  const font = new FontFaceObserver('Open Sans', {weight: [300, 700]})
  font.load().then(console.log('Open Sans loaded!'))
  
  import App from './components/App'
  
  export default () => <App />;
  
subject: watch for specific weights