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Pass variables from controller to existing node template file

In the Drupal 8 documentation I have found a way how to pass variable from controller to custom twig template

https://www.drupal.org/docs/8/theming/twig/create-custom-twig-templates-from-custom-module

test_twig.module

function test_twig_theme($existing, $type, $theme, $path) {   return [     'my_template' => [       'variables' => ['test_var' => NULL],     ],   ]; }

TestTwigController

class TestTwigController extends ControllerBase {   public function content() {      return [       '#theme' => 'my_template',       '#test_var' => $this->t('Test Value'),     ];    } }

But is there a way to pass variables from controller to already existing node template, for example to node–custom_content_type.html.twig

This article was republished from its original source.
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Pass variables from controller to existing node template file

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