Local variable for "serviceWorkerVersion" is deprecated in flutter

Problem: 

Local variable for "serviceWorkerVersion" is deprecated. Use "{{flutter_service_worker_version}}" template token instead. See https://docs.flutter.dev/platform-integration/web/initialization for more details.

While try to run my flutter app in chrome it shows the above error.

Solution:

In script file it shows as like below

<script>

// The value below is injected by flutter build, do not touch.

var serviceWorkerVersion = null;

</script>

Replace with below.It will works fine.

<script>

// The value below is injected by flutter build, do not touch.

var serviceWorkerVersion ="{{flutter_service_worker_version}}";

</script>