Fixed some psalm issues.

src/Services/AmountFormatter.php

@@ -60,7 +60,10 @@ class AmountFormatter
     }
 
     /**
-     * Formats the given value using the measurement unit and options.
+     *  Formats the given value using the measurement unit and options.
+     *
+     *  @param MeasurementUnit|null $unit The measurement unit, whose unit symbol should be used for formatting.
+     *                                    If set to null, it is assumed that the part amount is measured in pieces.
      *
      * @param MeasurementUnit|null $unit The measurement unit, whose unit symbol should be used for formatting.
      *                                   If set to null, it is assumed that the part amount is measured in pieces.
@@ -69,7 +72,7 @@ class AmountFormatter
      *
      * @throws InvalidArgumentException thrown if $value is not numeric
      */
-    public function format($value, ?MeasurementUnit $unit = null, array $options = [])
+    public function format(float $value, ?MeasurementUnit $unit = null, array $options = [])
     {
         if (! is_numeric($value)) {
             throw new InvalidArgumentException('$value must be an numeric value!');

src/Services/Attachments/PartPreviewGenerator.php

@@ -55,13 +55,15 @@ class PartPreviewGenerator
     }
 
     /**
-     * Returns a list of attachments that can be used for previewing the part ordered by priority.
-     * The priority is: Part MasterAttachment -> Footprint MasterAttachment -> Category MasterAttachment
-     * -> Storelocation Attachment -> MeasurementUnit Attachment -> ManufacturerAttachment.
+     *  Returns a list of attachments that can be used for previewing the part ordered by priority.
+     *  The priority is: Part MasterAttachment -> Footprint MasterAttachment -> Category MasterAttachment
+     *  -> Storelocation Attachment -> MeasurementUnit Attachment -> ManufacturerAttachment.
      *
      * @param Part $part the part for which the attachments should be determined
      *
-     * @return Attachment[]
+     * @return (Attachment|null)[]
+     *
+     * @psalm-return list<Attachment|null>
      */
     public function getPreviewAttachments(Part $part): array
     {

src/Services/EntityExporter.php

@@ -77,9 +77,10 @@ class EntityExporter
     }
 
     /**
-     * Exports an Entity or an array of entities to multiple file formats.
+     *  Exports an Entity or an array of entities to multiple file formats.
      *
      * @param Request $request the request that should be used for option resolving
+     * @param AbstractNamedDBElement|object[] $entity
      *
      * @return Response the generated response containing the exported data
      *

src/Services/EntityURLGenerator.php

@@ -187,7 +187,7 @@ class EntityURLGenerator
         throw new EntityNotSupportedException('The given entity is not supported yet!');
     }
 
-    public function viewURL($entity): string
+    public function viewURL(Attachment $entity): ?string
     {
         if ($entity instanceof Attachment) {
             if ($entity->isExternal()) { //For external attachments, return the link to external path
@@ -201,7 +201,7 @@ class EntityURLGenerator
         throw new EntityNotSupportedException('The given entity is not supported yet!');
     }
 
-    public function downloadURL($entity): string
+    public function downloadURL($entity): ?string
     {
         if ($entity instanceof Attachment) {
             if ($entity->isExternal()) { //For external attachments, return the link to external path

src/Services/LogSystem/HistoryHelper.php

@@ -35,10 +35,12 @@ class HistoryHelper
     }
 
     /**
-     * Returns an array containing all elements that are associated with the argument.
-     * The returned array contains the given element.
+     *  Returns an array containing all elements that are associated with the argument.
+     *  The returned array contains the given element.
      *
      * @return array
+     *
+     * @psalm-return array<\App\Entity\Parameters\AbstractParameter|array-key, mixed>
      */
     public function getAssociatedElements(AbstractDBElement $element): array
     {

src/Services/LogSystem/TimeTravel.php

@@ -209,6 +209,9 @@ class TimeTravel
         return $property->getValue($element);
     }
 
+    /**
+     * @param \DateTime|int|null $new_value
+     */
     protected function setField(AbstractDBElement $element, string $field, $new_value): void
     {
         $reflection = new \ReflectionClass(get_class($element));