add isConstantTypeCoverageEnabled()

README.md

@@ -19,8 +19,9 @@ What is the type coverage you ask? We have 4 type possible declarations in total
 ```php
 final class ConferenceFactory
 {
+    const SPEAKER_TAG = 'speaker';
+
     private $talkFactory;
-    public const SPEAKER_TAG = 'speaker';
 
     public function createConference(array $data)
     {
@@ -31,7 +32,9 @@ final class ConferenceFactory
 }
 ```
 
-The param type is defined, but property and return types are missing.
+*Note: Class constant types require PHP 8.3 to run.*
+
+The param type is defined. But the property, return and constant types are missing.
 
 * 1 out of 4 = 25 % coverage
 
@@ -40,12 +43,11 @@ Our code quality is only at one-quarter of its potential. Let's get to 100 %!
 ```diff
  final class ConferenceFactory
  {
--    private $talkFactory;
-+    private TalkFactory $talkFactory;
-
 -    public const SPEAKER_TAG = 'speaker';
 +    public const string SPEAKER_TAG = 'speaker';
 
+-    private $talkFactory;
++    private TalkFactory $talkFactory;
 
 -    public function createConference(array $data)
 +    public function createConference(array $data): Conference

src/Configuration.php

@@ -19,6 +19,15 @@ public function getRequiredPropertyTypeLevel(): float|int
         return $this->parameters['property'] ?? $this->parameters['property_type'];
     }
 
+    public function isConstantTypeCoverageEnabled(): bool
+    {
+        if (PHP_VERSION_ID < 80300) {
+            return false;
+        }
+
+        return $this->getRequiredConstantTypeLevel() > 0;
+    }
+
     public function getRequiredConstantTypeLevel(): float|int
     {
         return $this->parameters['constant'] ?? $this->parameters['constant_type'];

src/Rules/ConstantTypeCoverageRule.php

@@ -59,7 +59,7 @@ public function processNode(Node $node, Scope $scope): array
             ];
         }
 
-        if ($this->configuration->getRequiredConstantTypeLevel() === 0) {
+        if (! $this->configuration->isConstantTypeCoverageEnabled()) {
             return [];
         }