title: Expo App environments for Dev, UAT and Production
body: <p>I have a React Native app built in Expo that connects to a Rest API. There are three environments for the rest api - dev, uat and production as below (example).</p>
  <pre><code>dev = https://dev.myapi.com/api
  uat = https://uat.myapi.com/api
  prod = https://prod.myapi.com/api
  </code></pre>
  <p>Depending on where the app is being used it needs to connect to the correct environment.</p>
  <pre><code>Running in the Expo Client = Dev API
  Running in TestFlight or Internal Testing for the Play Store = UAT API
  Running in the App Store or Play Store = Production API
  </code></pre>
  <p>What is the simplest way to achieve this?</p>