title: Property 'default' does not exist on type 'typeof firebase'. Error
body: <p>I am doing connection with firebase from pwa-starter-kit-template-typescript project and getting this error:</p>
  
  <blockquote>
    <p><strong><em>Property 'default' does not exist on type 'typeof firebase'. ts(2339)</em></strong></p>
  </blockquote>
  
  <p>If I do not use default, it gives error <code>firebase.auth() does not exist</code>.</p>
  
  <p>I am using firebase verison 7.2.0. firebase is installed correctly. </p>
  
  <p>That is my code.</p>
  
  <pre><code>import * as firebase from 'firebase';
  
  import  'firebase/auth';
  
  formValidation()
  {
  
  var emailid = this.shadowRoot?this.shadowRoot.querySelector("#myemail") as TextElement:null;
  
  var pwd = this.shadowRoot?this.shadowRoot.querySelector("#mypassword") as TextElement:null;
  var defaultauth= firebase.default.auth();
  if(emailid!=null &amp;&amp; pwd!=null){
    //this.defaultauth.EmailAuthProvider.credential(emailid.value, pwd.value).catch(function(error: { code: any; message: any; }){
    defaultauth.createUserWithEmailAndPassword(emailid.value, pwd.value)
    .catch(function(error: { code: any; message: any; }){
      console.log(error.code);
      console.log(error.message);
    });
  }
  </code></pre>
  
  <p>}</p>