Mastering Drupal 8

Enabling Twig debug

The last piece of configuration requires us to create a local.services.yml file that will handle the Null caching we set up earlier, as well as enable Twig debugging:

1. First, we will need to copy development.services.yml, located in the /sites folder, to the /sites/default folder and rename the file to be called local.services.yml.
2. Next, remove the following line:

       parameters: httpd.response.debug_cacheability_headers: true 

3. Add the following lines to the bottom of the file:

       # Enable Twig debugging # # parameters: twig.config: debug: true        auto_reload: true cache: false 

4. Save the file.
5. Clear Drupal's cache.

We can validate that Twig debugging is now enabled by navigating back to our Drupal home page and using Google ...