title: How to add sourcemap in React Native for Production?
body: <p>I received error log like the following while the app crashed:</p>
  
  <blockquote>
    <p>Fatal Exception: com.facebook.react.modules.core.JavascriptException:
    onSelect index.android.bundle:20:7148 onPress
    index.android.bundle:20:2435</p>
  </blockquote>
  
  <p>But it's not really helpful for me to trouble shoot. How could I enable source map so that I could track down where the issue is ?</p>
  
  <p><strong>UPDATE 2018</strong>
  <a href="https://docs.expo.io/versions/latest/guides/using-sentry.html" rel="noreferrer">https://docs.expo.io/versions/latest/guides/using-sentry.html</a> Looks promising !</p>