>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #3538791. --> Reported by: [d34dman](https://www.drupal.org/user/751698) >>> <ul> <li><code>/js/</code> for Drupal JS integration.</li> <li><code>/modules/</code> for all submodules with their own <code>.info.yml</code> files.</li> <li><code>/config/</code> for default config and schema files.</li> <li><code>/tests/src/Kernel/</code> and <code>/tests/src/Functional/</code> for automated testing.</li> </ul>