How often we come across an error like "jQuery is not defind" in Drupal 8? Quite a lot of time. In most cases, this error can be resolved by passing drupal setting argument in drupal js behaviour. In your theme.libraries.yml file of your theme that you have used add these line in your global scripting tag 

Step 1

dependencies:
    - core/jquery
    - core/drupal
    - core/drupalSettings 

Once you are done with step 1 then clear chache. Open your…

Configuration Synchronizer provides methods for safely importing site configuration from updated modules and themes.

By taking a snapshot of configuration as installed and comparing the snapshot to the current active configuration, Configuration Synchronizer, determines configuration that has not changed since being installed and therefore can safely be updated without overwriting customizations.

Configuration Synchronizer requires the …