Issue #3385283 by e0ipso, smustgrave, idiaz.roncero, jldust, wotnak:...

Issue #3385283 by e0ipso, smustgrave, idiaz.roncero, jldust, wotnak: Components without props throw error

(cherry picked from commit 99040d47)

core/modules/sdc/src/Component/ComponentValidator.php

@@ -79,6 +79,10 @@ public function validateDefinition(array $definition, bool $enforce_schemas): bo
       }
       return TRUE;
     }
+    // If there are no props, force casting to object instead of array.
+    if (($schema['properties'] ?? NULL) === []) {
+      $schema['properties'] = new \stdClass();
+    }
     $classes_per_prop = $this->getClassProps($schema);
     $missing_class_errors = [];
     foreach ($classes_per_prop as $prop_name => $class_types) {

core/modules/sdc/tests/modules/sdc_test/components/no-props/no-props.component.yml

+$schema: https://git.drupalcode.org/project/sdc/-/raw/1.x/src/metadata.schema.json
+name: No props
+description: Component without properties
+props:
+  type: object
+  properties: {}

core/modules/sdc/tests/modules/sdc_test/components/no-props/no-props.twig

+This is a test string.

core/modules/sdc/tests/src/Kernel/ComponentRenderTest.php

@@ -44,6 +44,7 @@ public function testRender(): void {
     $this->checkRenderElementAlters();
     $this->checkSlots();
     $this->checkInvalidSlot();
+    $this->checkEmptyProps();
   }
 
   /**
@@ -335,6 +336,22 @@ public function checkInvalidSlot(): void {
     $this->renderComponentRenderArray($build);
   }
 
+  /**
+   * Ensure that components can have 0 props.
+   */
+  public function checkEmptyProps(): void {
+    $build = [
+      '#type' => 'component',
+      '#component' => 'sdc_test:no-props',
+      '#props' => [],
+    ];
+    $crawler = $this->renderComponentRenderArray($build);
+    $this->assertEquals(
+      $crawler->filter('#sdc-wrapper')->innerText(),
+      'This is a test string.'
+    );
+  }
+
   /**
    * Ensures some key aspects of the plugin definition are correctly computed.
    *