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How can I get the current node view mode and add to block template suggestion?

In my code, I need to get the current view mode of the node to be able to pass it to be used as a block template suggestion.

The function I have set up is able to grab all available view modes, but I just want the current one. Possibly a condition that I haven’t come across yet would do the trick? 

function mytheme_theme_suggestions_block_alter(array &$suggestions, array $variables) { // Add template suggestions based on the current view mode and node type.   if ($node = Drupal::routeMatch()->getParameter('node')) {     $view_modes = Drupal::entityQuery('entity_view_mode')    ->condition('targetEntityType', 'node')    ->execute();     foreach ($view_modes as $view_mode) {    $view_mode = str_replace('node.', '', $view_mode);    $suggestions[] = 'block--' . $node->getType() .'-'. $view_mode;   }  } }
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How can I get the current node view mode and add to block template suggestion?

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