By andypost on
Change record status: 
Published (View all published change records)
Project: 
Drupal core
Introduced in branch: 
8.8.x
Introduced in version: 
8.8.0
Issue links: 
https://www.drupal.org/node/2776031
https://www.drupal.org/node/2465887
Description: 

Install and uninstall functionality now managed by theme_installer service
The ThemeHandlerInterface methods install() and uninstall() deprecated and \Drupal\Core\Extension\ThemeInstallerInterface should be used instead.

Before

\Drupal::service('theme_handler')->install(['seven']);
\Drupal::service('theme_handler')->uninstall(['bartik']);

After

\Drupal::service('theme_installer')->install(['seven']);
\Drupal::service('theme_installer')->uninstall(['bartik']);
Impacts: 
Module developers
Site templates, recipes and distribution developers