title: Angular 4 export enum type from library/dependency
body: <p>I want to make a library to use in my Angular 4 applications, and for some business I will do on it I have an <code>enum</code> that the applications will need to use later.
  Problem is, I declare the enum like this in <code>my-enum.ts</code>:</p>
  
  <pre><code>export enum MyEnum {
      value1 = 1,
      value2 = 2,
      value3 = 3
  }
  </code></pre>
  
  <p>But then, I can't seem to import it from my app when I do the following:</p>
  
  <pre><code>import { MyEnum } from 'my-library';
  </code></pre>
  
  <p>How should I proceed to have this correctly?</p>