Change record status: 
Project: 
Introduced in branch: 
10.1.x
Introduced in version: 
10.1.0
Description: 

The function theme_get_registry() is deprecated without replacement.

Use theme.registry service's methods get() or getRuntime() instead.

Before After
$hooks = theme_get_registry();
$hooks = \Drupal::service('theme.registry')->get();
$hooks = theme_get_registry(FALSE);
$hooks = \Drupal::service('theme.registry')->getRuntime();
Impacts: 
Module developers