I'm taking my first steps with Drupal 8, starting with a custom theme. As a result I'm making incremental changes and testing them.
I've found that in order to be able to tweak CSS you have to turn off aggregation. The normal: change css,
drush cc css-js, reload page workflow doesn't work unless aggregation is disabled.
But I'm also having difficulty with Drupal not picking up changes to the yaml files, e.g. add css to the THEME.libraries.yml file - no
drush cc ... command has any effect. The only thing I've found to work is
drush cr (or
drupal cache:rebuild) which adds about 20-30s delay in my workflow.
Is there a quicker workflow for development?