Fix issues detected by psalm

src/ContaoDictionaryProvider.php

@@ -66,7 +66,7 @@ public function __construct(
         $this->extractorFactory = $extractorFactory;
         $this->mapBuilder       = $mapBuilder;
 
-        if (empty($dictionaryMeta)) {
+        if ([] === $dictionaryMeta || null === $dictionaryMeta) {
             $dictionaryMeta = [
                 'tl_page',
                 'tl_article',

src/Extractor/AbstractSerializingCompoundExtractor.php

@@ -25,7 +25,7 @@ abstract class AbstractSerializingCompoundExtractor implements MultiStringExtrac
      *
      * @var array<string, ExtractorInterface>
      */
-    private $extractors = [];
+    private array $extractors = [];
 
     /**
      * @param string                   $colName       The column name.
@@ -144,7 +144,11 @@ public function set(string $path, array &$row, ?string $value): void
 
         switch (true) {
             case $extractor instanceof MultiStringExtractorInterface:
-                $extractor->set($chunks[1], $content, $value);
+                $subKey = ($chunks[1] ?? '');
+                if ('' === $subKey) {
+                    throw new InvalidArgumentException('Invalid path value');
+                }
+                $extractor->set($subKey, $content, $value);
                 break;
             case $extractor instanceof StringExtractorInterface:
                 if (1 < count($chunks)) {

src/Extractor/ArrayExtractor.php

@@ -9,10 +9,12 @@
 
 use function array_key_exists;
 use function array_slice;
+use function assert;
 use function explode;
 use function get_class;
 use function implode;
 use function is_array;
+use function is_string;
 
 /**
  * This extracts numerical indexed arrays of values.
@@ -100,12 +102,17 @@ public function get(string $path, array $row): ?string
         /** @var mixed $content */
         $content = $arrayContent[$chunks[0]];
         $this->ensureArray($this->colName . '.' . $chunks[0], $content);
-
-        $extractor = $this->getExtractor($chunks[1]);
+        $extractorName = $chunks[1] ?? null;
+        assert(is_string($extractorName));
+        $extractor = $this->getExtractor($extractorName);
 
         switch (true) {
             case $extractor instanceof MultiStringExtractorInterface:
-                return $extractor->get($chunks[2], $content);
+                $subKey = ($chunks[2] ?? '');
+                if ('' === $subKey) {
+                    throw new InvalidArgumentException('Invalid path value');
+                }
+                return $extractor->get($subKey, $content);
             case $extractor instanceof StringExtractorInterface:
                 return $extractor->get($content);
             default:
@@ -114,6 +121,10 @@ public function get(string $path, array $row): ?string
         throw new InvalidArgumentException('Unknown extractor type ' . get_class($extractor));
     }
 
+    /**
+     * @psalm-suppress UnsupportedPropertyReferenceUsage
+     * @psalm-suppress UnsupportedReferenceUsage
+     */
     public function set(string $path, array &$row, ?string $value): void
     {
         if (!$this->supports($row)) {

src/Extractor/TableExtractor.php

@@ -61,7 +61,7 @@ public function get(string $path, array $row): ?string
         }
         [$rowIndex, $colIndex] = $this->extractPath($path);
 
-        if ($value = ($content[$rowIndex][$colIndex] ?? null)) {
+        if ((bool) ($value = ($content[$rowIndex][$colIndex] ?? null))) {
             return $value;
         }
 

src/Mapping/Terminal42ChangeLanguage/ContaoDatabase.php

@@ -4,6 +4,7 @@
 
 namespace CyberSpectrum\I18N\Contao\Mapping\Terminal42ChangeLanguage;
 
+use Doctrine\DBAL\ArrayParameterType;
 use Doctrine\DBAL\Connection;
 use Doctrine\DBAL\Query\QueryBuilder;
 use Doctrine\DBAL\Result;
@@ -67,7 +68,7 @@ public function getPagesByPidList(array $pidList): array
             ->select('id', 'pid', 'languageMain', 'type')
             ->from('tl_page')
             ->where('pid IN (:lookupQueue)')
-            ->setParameter('lookupQueue', $pidList, Connection::PARAM_INT_ARRAY)
+            ->setParameter('lookupQueue', $pidList, ArrayParameterType::INTEGER)
             ->orderBy('sorting'));
         $result = [];
         while ($row = $rows->fetchAssociative()) {

src/TranslationValue.php

@@ -71,12 +71,12 @@ public function getTarget(): ?string
 
     public function isSourceEmpty(): bool
     {
-        return empty($this->getSource());
+        return !(bool) $this->getSource();
     }
 
     public function isTargetEmpty(): bool
     {
-        return empty($this->getTarget());
+        return !(bool) $this->getTarget();
     }
 
     /**