Fixed static analysis issues.

src/DataTables/Column/LocaleDateTimeColumn.php

@@ -58,7 +58,7 @@ class LocaleDateTimeColumn extends AbstractColumn
 {
     /**
      * @param $value
-     * @return bool|mixed|string
+     * @return string
      * @throws Exception
      */
     public function normalize($value): string

src/DataTables/Column/SIUnitNumberColumn.php

@@ -21,6 +21,8 @@ class SIUnitNumberColumn extends AbstractColumn
 
         $resolver->setDefault('precision', 2);
         $resolver->setDefault('unit', '');
+
+        return $this;
     }
 
     public function normalize($value)

src/DataTables/Column/SelectColumn.php

@@ -21,6 +21,8 @@ class SelectColumn extends AbstractColumn
             'className' => 'select-checkbox no-colvis',
             'visible' => true,
         ]);
+
+        return $this;
     }
 
     public function normalize($value)

src/DataTables/Filters/Constraints/BooleanConstraint.php

@@ -13,7 +13,8 @@ class BooleanConstraint extends AbstractConstraint
 
     public function __construct(string $property, string $identifier = null, ?bool $default_value = null)
     {
-        parent::__construct($property, $identifier, $default_value);
+        parent::__construct($property, $identifier);
+        $this->value = $default_value;
     }
 
     /**

src/DataTables/Filters/Constraints/EntityConstraint.php

@@ -8,7 +8,7 @@ use App\Services\Trees\NodesListBuilder;
 use Doctrine\ORM\QueryBuilder;
 
 /**
- * @template T
+ * @template T of AbstractDBElement
  */
 class EntityConstraint extends AbstractConstraint
 {
@@ -16,7 +16,7 @@ class EntityConstraint extends AbstractConstraint
     private const ALLOWED_OPERATOR_VALUES_STRUCTURAL = ['INCLUDING_CHILDREN', 'EXCLUDING_CHILDREN'];
 
     /**
-     * @var
+     * @var NodesListBuilder
      */
     protected $nodesListBuilder;
 
@@ -37,7 +37,7 @@ class EntityConstraint extends AbstractConstraint
 
     /**
      * @param  NodesListBuilder|null  $nodesListBuilder
-     * @param  class-string  $class
+     * @param  class-string<T>  $class
      * @param  string  $property
      * @param  string|null  $identifier
      * @param  null  $value
@@ -80,7 +80,7 @@ class EntityConstraint extends AbstractConstraint
     }
 
     /**
-     * @return mixed|null
+     * @return T|null
      */
     public function getValue(): ?AbstractDBElement
     {

src/Repository/AbstractPartsContainingRepository.php

@@ -33,7 +33,7 @@ abstract class AbstractPartsContainingRepository extends StructuralDBElementRepo
      * @param  object  $element  the element for which the parts should be determined
      * @param  array  $order_by  The order of the parts. Format ['name' => 'ASC']
      *
-     * @return Part
+     * @return Part[]
      */
     abstract public function getParts(object $element, array $order_by = ['name' => 'ASC']): array;
 

src/Services/Trees/NodesListBuilder.php

@@ -92,7 +92,7 @@ class NodesListBuilder
      * Returns a flattened list of all (recursive) children elements of the given AbstractStructuralDBElement.
      * The value is cached for performance reasons.
      *
-     * @template T
+     * @template T of AbstractStructuralDBElement
      * @param  T $element
      * @return T[]
      */