title: Concatenate env variables in environment.ts
body: <p>I'd like to reduce some redundancy in my <code>environment.ts</code>, as many of my <code>env</code> variables start with the same. So what I wanted to do is this: </p>
  
  <pre><code>export const environment = {
      base_url: '//www.myWebsite.co.uk/',
      ws_base_url: this.base_url + 'ws',
      download_base_url: this.base_url + 'download'
  }
  </code></pre>
  
  <p>Rather then: </p>
  
  <pre><code>export const environment = {
      base_url: '//www.myWebsite.co.uk/',
      ws_base_url: '//www.myWebsite.co.uk/ws',
      download_base_url: '//www.myWebsite.co.uk/download'
  }
  </code></pre>
  
  <p>But when I use the <code>environment.ws_base_url</code> I don't get <code>//www.myWebsite.co.uk/ws</code>, but <code>undefined/ws</code>. I was just wondering if this is really not working or if I'm just missing something. </p>