title: Can't understand console error: 'Uncaught TypeError: t is not a function'
body: <p>I am attempting to host a Ruby on Rails / React app in Heroku. Also of not, I am using the package google-maps-react ( <a href="https://github.com/fullstackreact/google-maps-react" rel="nofollow noreferrer">https://github.com/fullstackreact/google-maps-react</a> ). Everything works locally, but when I push to heroku, nothing displays, and this error appears in console:</p>
  
  <pre><code>windowOrGlobal.js:18 Uncaught TypeError: t is not a function
      at Object.a (windowOrGlobal.js:18)
      at Object.&lt;anonymous&gt; (windowOrGlobal.js:5)
      at Object.&lt;anonymous&gt; (index-fb4bbac5de0de29c6900.js:2)
      at n (bootstrap:19)
      at Object.&lt;anonymous&gt; (ScriptCache.js:3)
      at n (bootstrap:19)
      at Object.&lt;anonymous&gt; (GoogleApiComponent.js:5)
      at n (bootstrap:19)
      at Object.&lt;anonymous&gt; (index.js:5)
      at n (bootstrap:19)
  </code></pre>
  
  <p>When I click on the top line from the error stack, it is this:</p>
  
  <pre><code>var _typeof = typeof Symbol === "function" &amp;&amp; _typeof(Symbol.iterator) === "symbol" ? function (obj) {
  </code></pre>
  
  <p>Where is <code>t</code> being attempted to be called as a function? I can't figure out where that error could be coming from, when there is nothing attempting to call a function <code>t()</code>.</p>
  
  <p>Anyone have any clue what might be going on?</p>