title: "export 'Renderer' was not found in '@angular/core'
body: <p>When we upgrade the angular <strong>version</strong> <strong>8</strong> to <strong>9</strong> then it is show the following error during <code>ng serve</code>.</p>
  
  <p><img src="https://i.stack.imgur.com/I08fN.png" alt="enter image description here"></p>