Fix issue psalm.

psalm.xml

@@ -12,4 +12,8 @@
             <directory name="vendor" />
         </ignoreFiles>
     </projectFiles>
+
+    <issueHandlers>
+        <PropertyNotSetInConstructor errorLevel="suppress" />
+    </issueHandlers>
 </psalm>

src/Hint.php

@@ -19,7 +19,8 @@ protected function run(): string
     {
         $new = clone $this;
 
-        $hint = $new->modelInterface->getAttributeHint($new->attribute) ?? $new->hint;
+        $hint = $new->modelInterface->getAttributeHint($new->attribute) !== ''
+            ? $new->modelInterface->getAttributeHint($new->attribute) : $new->hint;
 
         $new->attributes['id'] = $new->getId($new->modelInterface->getFormName(), $new->attribute) . '-hint';
 

src/Input.php

@@ -90,7 +90,11 @@ protected function run(): string
             $new->setPlaceholder();
         }
 
-        foreach ($new->modelInterface->getRules()[$new->attribute] as $rule) {
+        /** @var array */
+        $rules = $new->modelInterface->getRules();
+
+        /** @var object $rule */
+        foreach ($rules[$new->attribute] as $rule) {
             if ($rule instanceof Required) {
                 $new = $new->required();
             }
@@ -258,9 +262,7 @@ private function setPlaceholder(): void
         ) {
             $attributeName = $this->getAttributeName($this->attribute);
 
-            if ($this->modelInterface !== null) {
-                $this->attributes['placeholder'] = $this->modelInterface->getAttributeLabel($attributeName);
-            }
+            $this->attributes['placeholder'] = $this->modelInterface->getAttributeLabel($attributeName);
         }
     }
 }

src/Label.php

@@ -8,6 +8,9 @@
 use Yiisoft\Form\FormModelInterface;
 use Yiisoft\Html\Html;
 
+/**
+ * @psalm-suppress MissingConstructor
+ */
 final class Label extends Widget
 {
     private string $charset = 'UTF-8';
@@ -22,10 +25,11 @@ protected function run(): string
     {
         $new = clone $this;
 
+        /** @var string */
         $for = ArrayHelper::remove(
             $new->attributes,
             'for',
-            $new->getId($new->modelInterface->getFormName(), $new->attribute, $new->charset)
+            $new->getId($new->modelInterface->getFormName(), $new->attribute)
         );
 
         $label = $new->label === ''

src/Widget.php

@@ -14,7 +14,7 @@ abstract class Widget extends AbstractWidget implements NoEncodeStringableInterf
 {
     protected string $attribute = '';
     protected array $attributes = [];
-    protected ?ModelInterface $modelInterface = null;
+    protected ModelInterface $modelInterface;
     private bool $autoGenerate = true;
     private string $charset = 'UTF-8';
     private string $id = '';