title: How to use react-bootstrap plugins with Ruby on Rails, React and ES6?
body: <p>I am developing a web application using Ruby on Rails, ReactJS and ES6.
  I am trying to import react-bootstrap plugins (like Tokenfield for taggings) using below steps:</p>
  
  <pre><code>1. npm install react-bootstrap --save
  2. import Button from 'react-bootstrap/lib/Button';
  </code></pre>
  
  <p>But i am getting error:</p>
  
  <p><code>ExecJS::ProgramError (TypeError: undefined is not a function).</code></p>
  
  <p>Could any one guide me where I am missing anything.</p>
  
  <p>Any help would be highly appreciated</p>