title: Upgrade to Firebase JS 8.0.0: Attempted import error: 'app' is not exported from 'firebase/app' (imported as 'firebase')
body: <p>After upgrading to 8.0.0, I get the following error:</p>
  <blockquote>
  <p>Attempted import error: 'initializeApp' is not exported from 'firebase/app' (imported as 'firebase').</p>
  </blockquote>
  <p>My import looks like this:</p>
  <pre class="lang-js prettyprint-override"><code>import * as firebase from &quot;firebase/app&quot;
  firebase.initializeApp({ ... })
  </code></pre>
  <p>TypeScript also complains:</p>
  <blockquote>
  <p>Property 'initializeApp' does not exist on type 'typeof import(&quot;/path/to/my/file&quot;)'. ts(2339)</p>
  </blockquote>
  <p>How do I fix this?</p>