public ModuleHandlerInterface::getHookInfo()
Retrieves a list of hooks that are declared through hook_hook_info().
array An associative array whose keys are hook names and whose values are an associative array containing a group name. The structure of the array is the same as the return value of hook_hook_info().
public function getHookInfo();
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Extension!ModuleHandlerInterface.php/function/ModuleHandlerInterface::getHookInfo/8.1.x