Results

    // Modify the "/node/add" route to use our own controller instead.
    if ($route = $collection->get('node.add_page')) {
      $defaults = $route->getDefaults();
      $defaults['_controller'] = "\Drupal\gin_type_tray\Controller\GinTypeTrayController::addPage";
      $route->setDefaults($defaults);
    }
  }

        $theme_registry['type_tray_page']['template'] = 'type-tray-page';
        $theme_registry['type_tray_page']['path'] = \Drupal::service('extension.list.module')->getPath('gin_type_tray') . '/templates';
        $theme_registry['type_tray_page']['variables']['node_add_page_url_grid'] = Url::fromRoute('node.add_page', ['layout' => 'grid']);
        $theme_registry['type_tray_page']['variables']['node_add_page_url_list'] = Url::fromRoute('node.add_page', ['layout' => 'list']);
    }

}

/*
 *  Implements hook_preprocess().

      $output .= '<li>' . t('Go to the "Manage display" page and disable "Label" for this New field.') . '</li>';
      $output .= '<li>' . t('Create content from step 2) by <a href=":new_content">link</a>', [
        ':new_content' => Url::fromRoute('node.add_page')->toString()
      ]) . '</li>';
      $output .= '<li>' . t('Enable the "Live Blog status" checkbox and Save.') . '</li>';
      $output .= '<li>' . t('Now you can add/update/delete any posts.') . '</li>';
      $output .= '</ol>';
      $output .= '<p>' . t('Multiple users can have that page opened and all Live Blog posts get updated automatically.') . '</p>';
      $output .= '<p>' . t('Thank you for using it!') . '</p>';

---
{% set node_add_link_text %}{% trans %}Add content{% endtrans %}{% endset %}
{% set node_add_link = render_var(help_route_link(node_add_link_text, 'node.add_page')) %}
{% set configuring_topic = render_var(help_topic_link('book.configuring')) %}
<h2>{% trans %}Goal{% endtrans %}</h2>
<p>{% trans %}Add a page to an existing book.{% endtrans %}</p>
<h2>{% trans %}Steps{% endtrans %}</h2>
<ol>
  <li>{% trans %}In the <em>Manage</em> administrative menu, navigate to <em>Content</em> &gt; <em>{{ node_add_link }}</em> &gt; <em>Book page</em>. If you have configured additional content types that can be added to books, you can substitute a different content type for <em>Book page</em>; see {{ configuring_topic }} for more information.{% endtrans %}</li>

    // Assert that the reordering was successful.
    $this->assertLinkWeight('node.add_page', -50);
    $this->assertLinkWeight($link1_id, -49);
    $this->assertLinkWeight('filter.tips_all', -48);

    $this->drupalGet($node1_edit_url);
    $this->assertSession()->pageTextContains('(provided menu link)');
    $this->assertSession()->pageTextContains('Change the weight of the links within the Tools menu');

    $this->assertLinkWeight('filter.tips_all', -49);
    $this->assertLinkWeight($link2_id, -48);
    $this->assertLinkWeight('node.add_page', -47);

    $node2_edit_url = $this->drupalGetNodeByTitle($node2_title)->toUrl('edit-form');

    $this->drupalGet($node2_edit_url);
    $this->assertSession()->pageTextContains('(provided menu link)');
    $option = $this->assertSession()->optionExists('edit-menu-menu-link-weight-link-current-weight', -48);

    $this->assertLinkWeight('filter.tips_all', -48);
    $this->assertLinkWeight($link2_id, -47);
    $this->assertLinkWeight('node.add_page', -46);

    // Test the custom tree reordering functionality:
    $this->moduleInstaller->install(array('menu_link_weight_test'));
    // Insert the new link above item 2:
    $this->state->set('menu_link_weight_test_parent_value', 'tools:');
    $this->state->set('menu_link_weight_test_relative_position', 'above_' . $link2_id);

    $this->assertLinkWeight($link4_id, -47);
    $this->assertLinkWeight($link2_id, -46);
    $this->assertLinkWeight('node.add_page', -45);

    $this->state->set('menu_link_weight_test_relative_position', 'below_' . $link2_id);
    $node5_title = $this->randomMachineName();
    $edit = array(
      'title[0][value]' => $node5_title,
      'menu[enabled]' => 1,

    $this->assertLinkWeight($link2_id, -46);
    $this->assertLinkWeight($link5_id, -45);
    $this->assertLinkWeight('node.add_page', -44);
  }
}

    // Assert that the reordering was successful.
    $this->assertLinkWeight('node.add_page', -50);
    $this->assertLinkWeight($link1_id, -49);
    $this->assertLinkWeight('filter.tips_all', -48);

    $this->drupalGet($node1_link->getEditRoute());
    $this->assertSession()->elementContains('css', '.menu-link-weight-link-current', $node1_title);
    $this->assertSession()->pageTextContains('(provided menu link)');

    $this->assertLinkWeight('filter.tips_all', -49);
    $this->assertLinkWeight($link2_id, -48);
    $this->assertLinkWeight('node.add_page', -47);

    $this->drupalGet($node2_link->getEditRoute());
    $this->assertSession()->elementContains('css', '.menu-link-weight-link-current', $node2_title);
    $this->assertSession()->pageTextContains('(provided menu link)');
    $option = $this->assertSession()->optionExists('edit-menu-menu-link-weight-link-current-weight', -48);
    $this->assertTrue($option->hasAttribute('selected'));

    $this->assertLinkWeight('filter.tips_all', -48);
    $this->assertLinkWeight($link2_id, -47);
    $this->assertLinkWeight('node.add_page', -46);

    // Test the custom tree reordering functionality:
    $this->moduleInstaller->install(array('menu_link_weight_test'));
    // Insert the new link above item 2:
    $this->state->set('menu_link_weight_test_parent_value', 'tools:');
    $this->state->set('menu_link_weight_test_relative_position', 'above_' . $link2_id);

    $this->assertLinkWeight($link4_id, -47);
    $this->assertLinkWeight($link2_id, -46);
    $this->assertLinkWeight('node.add_page', -45);

    $this->state->set('menu_link_weight_test_relative_position', 'below_' . $link2_id);
    $node5_title = '5 ' . $this->randomMachineName();
    $node5 = $this->drupalCreateNode(['type' => $this->nodeType, 'title' => $node5_title]);
    $edit = array(
      'title[0][value]' => $node5_title,

    $this->assertLinkWeight($link2_id, -46);
    $this->assertLinkWeight($link5_id, -45);
    $this->assertLinkWeight('node.add_page', -44);

    // Rearrange menu link on a default menu link form.
    $edit = array(
      'menu[menu_link_weight][' . $link1_id . '][weight]' => '1',
      'menu[menu_link_weight][' . $link2_id . '][weight]' => '2',
      'menu[menu_link_weight][' . $link3_id . '][weight]' => '3',

    $this->assertLinkWeight($link5_id, 5);
    $this->assertLinkWeight('filter.tips_all', 6);
    $this->assertLinkWeight('node.add_page', 7);
  }

}

    else {
      $element['#value'] = Url::fromRoute('node.add_page', [], ['absolute' => TRUE])->toString();
    }

    return $element;
  }

  /**

    if (!$this->moduleHandler->moduleExists('type_tray')) {
      // Modify the "/node/add" route to use our own controller instead.
      if ($route = $collection->get('node.add_page')) {
        $defaults = $route->getDefaults();
        $defaults['_controller'] = '\Drupal\micronode\Controller\MicronodeController::addPage';
        $route->setDefaults($defaults);
      }
    }

    // Modify some built-in routes to point to MM's equivalent.
    $aliases = [
      'node.add_page' => 'monster_menus.add_node',
      'node.add' => 'monster_menus.add_node_with_type',
    ];
    foreach ($aliases as $from => $to) {
      if ($collection->get($from) && ($to_route = $collection->get($to))) {
        $collection->remove($from);
        $collection->add($from, clone $to_route);

    $this->addCreateEntityLinks(
      'navigation.content',
      'node.add_page',
      'node.add',
      'node_type',
      $links
    );

    // $this->createItemRecentContentLinks('node');

    // Verify that the user does not have access to the entity create form of
    // the group content type.
    $url = Url::fromRoute('node.add_page');
    $this->assertNotInstanceOf(AccessResultAllowed::class, $url->access(User::getAnonymousUser(), TRUE));

    // Test that the user can access the entity create form when the permission
    // to create group content is granted. Note that node access control is
    // cached, so we need to reset it when we change permissions.
    $this->container->get('entity_type.manager')->getAccessControlHandler('node')->resetCache();

        ':content' => Url::fromRoute('system.admin_content')->toString(),
        '@onlyone_add_page' => $onlyone_add_page,
        ':add-content' => Url::fromRoute('node.add_page')->toString(),
      ];

      // Getting the help link for the admin_toolbar module.
      $admin_toolbar_page = \Drupal::service('onlyone.module_handler')->getModuleHelpPageLink('admin_toolbar', 'Admin Toolbar', TRUE);
      // Getting the help link for the admin_toolbar_tools module.
      $admin_toolbar_tools_page = \Drupal::service('onlyone.module_handler')->getModuleHelpPageLink('admin_toolbar_tools', 'Admin Toolbar Extra Tools', TRUE);

      $output .= '<dd>' . t('To configure the module settings visit the <a href=":settings-page">Settings</a> page, if you want to have the configured content types in a new menu entry named <em>Add content (Only One)</em> you must check the option <em>Show configured content types in a new menu entry</em>, the new menu link will be available in the <a href=":content">Content</a> page as an action link to the @onlyone_add_page, then the <a href=":add-content">Add content</a> page will show the not configured content types. For this you need the <em>Administer Only One</em> permission.', $routes) . '</dd>';
      $output .= '<dt>' . t('Creating content') . '</dt>';
      $output .= '<dd>' . t('Once you try to <a href=":add-content">Add content</a>, if the chosen content type is configured to have Only One content and it already has one content created in the actual language, you will be redirected to <em>edit</em> the content, otherwise, you will go to create a new one.', [':add-content' => Url::fromRoute('node.add_page')->toString()]) . '</dd>';
      $output .= '</dl>';
      $output .= '<h3>' . t('Aditionals modules') . '</h3>';
      $output .= '<dl>';
      $output .= '<dt>' . $onlyone_admin_toolbar . '</dt>';
      $output .= '<dd>' . t(
      'Very useful if you use the @admin_toolbar_page module as it handles modifications to the @admin_toolbar_tools_page module menu entries related to the configured content types.',

{% set drupal_values = 'https://www.drupal.org/about/values-and-principles' %}
{% set drupal_user_guide = 'https://www.drupal.org/docs/user_guide/en/index.html' %}
{% set create_content = path('node.add_page')  %}
{% set drupal_extend = 'https://www.drupal.org/docs/extending-drupal' %}
{% set drupal_global_training_days = 'https://groups.drupal.org/global-training-days' %}
{% set drupal_events = 'https://www.drupal.org/community/events' %}
{% set drupal_slack = 'https://www.drupal.org/slack' %}
{% set drupal_chat = 'https://www.drupal.org/drupalchat' %}
{% set drupal_answers = 'https://drupal.stackexchange.com/' %}

   */
  protected function getCreateEntityUrl() {
    return Url::fromRoute('node.add_page');
  }

  /**
   * {@inheritdoc}
   */
  protected function getEditEntityUrl($id) {

    // Assert a couple of route names are present. A full test would require
    // a WebDriverTestBase test.
    $assert->responseContains('node.add_page');
    $assert->responseContains('node.configure_rebuild_confirm');
  }

}

    elseif (count($node_types) > 1) {
      $base_plugin_definition['route_name'] = 'node.add_page';
      $base_plugin_definition['title'] = new TranslatableMarkup('Add content');
      $this->derivatives[] = $base_plugin_definition;
    }
    return parent::getDerivativeDefinitions($base_plugin_definition);
  }

    if ($route = $collection->get('node.add_page')) {
      $route->setDefault('_controller', '\Drupal\social_course\Controller\NodeController::addPage');
    }

    parent::alterRoutes($collection);

    $paths = [

      $markup_data = $this->t('No content available.') . ' '
        . Link::fromTextAndUrl($this->t('Add content'),
        new Url('node.add_page'))->toString();

      return [
        '#type' => 'markup',
        '#markup' => $markup_data,
      ];
    }

  protected function alterRoutes(RouteCollection $collection) {
    // Modify the "/node/add" route to use our own controller instead.
    if ($route = $collection->get('node.add_page')) {
      $defaults = $route->getDefaults();
      $defaults['_controller'] = '\Drupal\type_tray\Controller\TypeTrayController::addPage';
      $route->setDefaults($defaults);
    }
  }

    // Send the user back to the Type Tray page.
    return new RedirectResponse(Url::fromRoute('node.add_page')->setAbsolute()->toString());
  }

}