title: Set variable equal to class color
body: <p>In my css file I have:</p>
  <pre><code>.activeStar {
      @include themify($themes) {
          color: themed('activeStar');
      }
  }
  </code></pre>
  <p>I need to set a variable in my .js file in React equal to whatever color the above css pulls since it will change based on the set theme.</p>
  <pre><code>var activeStar = '???';
  </code></pre>
  <p>I am using the ReactStars component which requires the color be defined when the plugin is called and does not assign classes but need this color to change based on the theme.</p>