Error: Call to undefined function Drupal\ckeditor_markdown\Plugin\CKEditorPlugin\drupal_get_path() in Drupal\ckeditor_markdown\Plugin\CKEditorPlugin\Markdown->getButtons() (line 22 of ../contrib/ckeditor_markdown/src/Plugin/CKEditorPlugin/Markdown.php).

Similar issue:

https://www.drupal.org/project/commerce_pricelist/issues/3353428#:~:text... 🐛 Call to undefined function drupal_get_path() with D10 Fixed ()%20no%20longer%20exists%20with,be%20able%20to%20support%20D10.

Patch created that updates the code...

diff --git a/src/Plugin/CKEditorPlugin/Markdown.php b/src/Plugin/CKEditorPlugin/Markdown.php
index b5c771e..992cbab 100644
--- a/src/Plugin/CKEditorPlugin/Markdown.php
+++ b/src/Plugin/CKEditorPlugin/Markdown.php
@@ -19,7 +19,7 @@ class Markdown extends CKEditorPluginBase {
    * {@inheritdoc}
    */
   public function getButtons() {
-    $path = $this->getModulePath('ckeditor_markdown') . '/js/plugins/markdown';
+    $path = \Drupal::service('extension.list.module')->getPath('ckeditor_markdown') . '/js/plugins/markdown';
     return [
       'Markdown' => [
         'label' => $this->t('Markdown'),
@@ -32,7 +32,7 @@ class Markdown extends CKEditorPluginBase {
    * {@inheritdoc}
    */
   public function getFile() {
-    return $this->getModulePath('ckeditor_markdown') . '/js/plugins/markdown/plugin.js';
+    return \Drupal::service('extension.list.module')->getPath('ckeditor_markdown') . '/js/plugins/markdown/plugin.js';
   }

   /**

Reroll the patch to version 1.3