use Drupal\Core\Url; $rendable_link = [ '#type' => 'link', '#title' => $this->t('Link title'), '#url' => Url::fromRoute('YOUR_ROUTE'), ];
$link = [ '#type' => 'link', '#title' => [ '#type' => 'inline_template', '#template' => '{{ title }} <span class="icon-right-arrow"></span>', '#context' => [ 'title' => $title ], ], '#url' => Url::fromRoute('user.pass'), ];