public ThemeHandlerInterface::themeExists($theme)
Determines whether a given theme is installed.
string $theme: The name of the theme (without the .theme extension).
bool TRUE if the theme is installed.
public function themeExists($theme);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Extension!ThemeHandlerInterface.php/function/ThemeHandlerInterface::themeExists/8.1.x