Fix: Deprecated function: Return type of...

bg_img_field.info.yml

 name: Background Image Field
 description: Allows you to add responsive background images based on selctors.
 core: 8.x
-core_version_requirement: ^8 || ^9
+core_version_requirement: ^8 || ^9 || ^10
 type: module
 package: Field types
 

composer.json

+{
+    "name": "drupal/bg_img_field",
+    "description": "Allows you to add responsive background images based on selectors.",
+    "type": "drupal-module",
+    "license": "GPL-2.0-or-later",
+    "require": {
+        "drupal/core": "^8 || ^9 || ^10"
+    }
+}
\ No newline at end of file

src/Component/Render/CSSSnippet.php

@@ -36,7 +36,7 @@ class CSSSnippet implements MarkupInterface {
   /**
    * {@inheritdoc}
    */
-  public function jsonSerialize() {
+  public function jsonSerialize(): mixed {
     return $this->__toString();
   }
 

src/Plugin/Field/FieldFormatter/BgImgFieldFormatter.php

@@ -315,7 +315,7 @@ class BgImgFieldFormatter extends ResponsiveImageFormatter implements ContainerF
             }
 
             if ($mapping['image_mapping'] == "_original image_") {
-              $url = file_create_url($image->getFileUri());
+              $url = \Drupal::service('file_url_generator')->generateAbsoluteString($image->getFileUri());
             }
             else {
               $url = ImageStyle::load($mapping['image_mapping'])->buildUrl($image->getFileUri());