Add remaining missing return types to safe methods

Author: wouterj

Data/Generator/AbstractDataGenerator.php

@@ -95,9 +95,9 @@ public function generateData(GeneratorConfig $config): void
      */
     abstract protected function scanLocales(LocaleScanner $scanner, string $sourceDir): array;
 
-    abstract protected function compileTemporaryBundles(BundleCompilerInterface $compiler, string $sourceDir, string $tempDir);
+    abstract protected function compileTemporaryBundles(BundleCompilerInterface $compiler, string $sourceDir, string $tempDir): void;
 
-    abstract protected function preGenerate();
+    abstract protected function preGenerate(): void;
 
     abstract protected function generateDataForLocale(BundleEntryReaderInterface $reader, string $tempDir, string $displayLocale): ?array;
 

Data/Util/ArrayAccessibleResourceBundle.php

@@ -32,7 +32,7 @@ public function __construct(\ResourceBundle $bundleImpl)
         $this->bundleImpl = $bundleImpl;
     }
 
-    public function get(int|string $offset)
+    public function get(int|string $offset): mixed
     {
         $value = $this->bundleImpl->get($offset);
 

Data/Util/RecursiveArrayAccess.php

@@ -20,7 +20,7 @@
  */
 class RecursiveArrayAccess
 {
-    public static function get(mixed $array, array $indices)
+    public static function get(mixed $array, array $indices): mixed
     {
         foreach ($indices as $index) {
             // Use array_key_exists() for arrays, isset() otherwise