DrupalCon Amsterdam 2019:Next steps on modernizing the Drupal theme system (Drupal 9 and beyond)

In this talk, Lauri Eskola discusses the complexities of Drupal's theme system, highlighting the challenges developers face when changing markup, preprocessing data, and attaching CSS and JavaScript. With the theme system being over a decade old, Eskola addresses its shortcomings in supporting modern software engineering practices, such as semantic versioning and component-driven development. He provides an overview of the adjustments made prior to Drupal 9 to address these issues and outlines potential improvements to enhance the frontend development experience in future minor releases of Drupal 9.