![]() This file follows yaml syntax, so remember to set the indentation to spaces instead of tabs, and respect that indentation. info file is not needed anymore as it was replaced by. The only file Drupal needs to recognize your theme is the. It's recommended to classify them whether they are contri or custom themes, so your structure should look something like: You should locate themes in Drupal 9 in the themes folder of the root Drupal installation. Let's go through each one of them! Step 1: Create the folder structure However, having a migration checklist can help smooth the process, so these are the steps we follow for rebuilding our themes: So when we do it, we're facing a whole theme rebuild-which can be overwhelming since we'll create a theme from scratch and replicate items manually from our D7 theme. Your Drupal 9 Theme Migration ChecklistĪs for the migration of Drupal 7 themes to Drupal 9, there's no tool to do it automatically or to flag what needs changing. Once the compilation is done, the template files are cached for reuse and are recompiled when the Twig cache is cleared. Twig is a PHP-based compiled templating language, which means that when your web page is rendered, the Twig engine takes the template and converts it into a compiled PHP template stored in a protected directory in sites/default/files/php/twig. ![]() Of all those changes, the most important is probably the theme engine moving to Twig. CSS file structure based on SMACSS & BEM.Attachment of JS and CSS assets by using libraries (instead of drupal_add_css and drupal_add_js).Default performance-enhancing features (like CSS and JS aggregation).Previous theme_* functions and *.tpl.php files replaced by *.html.twig files.Use of Twig as the theme engine instead of PHPTemplate.Improved out-of-the-box accessibility features.Let's look at the main theming features on Drupal 9 and how to have your Drupal 7 theme ready for this latest version of Drupal.ĭrupal 9 has many features that make life easier for anyone who wants to upgrade their theme. And if you're upgrading your theme to D9, given Drupal 7's upcoming end of life in November 2022, you'll find the job considerably easier if you follow some basic but crucial steps. If you develop for Drupal 9, you probably noticed that theming has improved a lot.
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