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In an admin settings form in a custom module, I need to determine what base themes a specific theme uses (the default theme, not the current theme). If I know the child theme's name, how do I obtain the names of the 'base themes' that child theme uses (if any)?

2 Answers 2

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You can get the details of a theme by using ThemeHandler::listInfo().

$child_theme = 'bartik';

$base_theme = \Drupal::service('theme_handler')->listInfo()[$child_theme]->base_theme;

$base_themes = \Drupal::service('theme_handler')->listInfo()[$child_theme]->base_themes;
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As of 2018, you can now get the base theme by inspecting the active theme's extensions: https://www.drupal.org/node/3019948

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