title: React Native: process.env has only NODE_ENV
body: <p>I'm setting an environment variable while building my react-native app (on windows):</p>
  
  <pre><code>SET APP_ENV=dev &amp; react-native run-android
  </code></pre>
  
  <p><code>echo %APP_ENV%</code> returns 'dev'</p>
  
  <p>But when I log process.env object in my JS file, I only get:</p>
  
  <pre><code>{
    NODE_ENV: "development"
  }
  </code></pre>
  
  <p>Is there a different way to access environment variables set through command prompt?</p>