title: Property 'result' does not exist on type 'EventTarget'
body: <p>I am getting below  error on types of Events. ERROR:Property 'result' does not exist on type 'EventTarget'.</p>
  
  <p>my <code>.ts</code> file,</p>
  
  <pre><code>select4File(event) {
      if (event.target.files &amp;&amp; event.target.files[0]) {
          var reader = new FileReader();
  
          reader.readAsDataURL(event.target.files[0]); // read file as data url
  
          reader.onload = (event) =&gt; { // called once readAsDataURL is completed
              this.imageurl2 = event.target.result;
  
  
          }
          this.selectedfiles = event.target.files;
      }
  
  }
  </code></pre>
  
  <pre><code>my html,
   &lt;div class="form-inline" Style="color: black"&gt;
            &lt;div class="row"&gt;
            &lt;div class="col-md-6 offset-md-3"&gt;
              &lt;label style ="color: black"&gt;Additional ID Back&lt;/label&gt;
              &lt;form &gt;
            &lt;div class="form-inline" &gt;
                &lt;img [src]="imageurl2" height="200"&gt; &lt;br/&gt;
              &lt;input type="file"(change)="select4File($event)"  /&gt;
            &lt;/div&gt;
              &lt;/form&gt;
            &lt;/div&gt;
            &lt;/div&gt;
              &amp;nbsp; &amp;nbsp;
              &lt;button (click)="uploadADIDback()" class="btn btn-primary" style="margin:0 35%;position:relative;left:-35px;background-color: #3560a5;  /* blue */"&gt;Upload&lt;/button&gt;
            &lt;/div&gt;
            &lt;/div&gt;
  </code></pre>
  
  <p>help here to solve this error.</p>