feat: adjusts for project php version

.phpunit.cache/test-results

@@ -1 +1 @@
-{"version":"pest_3.0.0-dev-0008","defects":{"P\\Tests\\Plugin::__pest_evaluable_it_can_output_to_json":7,"P\\Tests\\Plugin::__pest_evaluable_output":7},"times":{"P\\Tests\\Plugin::__pest_evaluable_output":6.946,"P\\Tests\\Plugin::__pest_evaluable_it_can_output_to_json":1.905,"P\\Tests\\Support\\ConfigurationSourceDetector::__pest_evaluable_it_detects_the_source_of_the_application":0.001}}
+{"version":"pest_3.0.0-dev-0008","defects":{"P\\Tests\\Plugin::__pest_evaluable_it_can_output_to_json":7,"P\\Tests\\Plugin::__pest_evaluable_output":7},"times":{"P\\Tests\\Plugin::__pest_evaluable_output":6.479,"P\\Tests\\Plugin::__pest_evaluable_it_can_output_to_json":1.683,"P\\Tests\\Support\\ConfigurationSourceDetector::__pest_evaluable_it_detects_the_source_of_the_application":0.001}}

src/Result.php

@@ -4,13 +4,19 @@
 
 namespace Pest\TypeCoverage;
 
+use Pest\TestSuite;
 use PHPStan\Analyser\Error as PHPStanError;
 
 /**
  * @internal
  */
 final class Result
 {
+    /**
+     * Either the project supports constant types or not.
+     */
+    private static ?bool $supportsConstantTypes = null;
+
     /**
      * Creates a new result instance.
      *
@@ -72,7 +78,7 @@ public static function fromPHPStanErrors(string $file, array $phpstanErrors, arr
                 $returnTypeCoverage = (int) explode(' ', explode('only ', $message)[1])[2];
             }
 
-            if (str_contains($error->getMessage(), 'constant types')) {
+            if (self::supportsConstantTypes() && str_contains($error->getMessage(), 'constant types')) {
                 $constantsCoverage = (int) explode(' ', explode('only ', $message)[1])[2];
             }
         }
@@ -88,4 +94,33 @@ public static function fromPHPStanErrors(string $file, array $phpstanErrors, arr
             (int) round(($propertyCoverage + $paramCoverage + $returnTypeCoverage + $constantsCoverage) / 4, mode: PHP_ROUND_HALF_DOWN),
         );
     }
+
+    /**
+     * Either the project supports constant types or not.
+     */
+    public static function supportsConstantTypes(): bool
+    {
+        if (self::$supportsConstantTypes !== null) {
+            return self::$supportsConstantTypes;
+        }
+
+        $rootPath = TestSuite::getInstance()->rootPath;
+        $fallback = version_compare(PHP_VERSION, '8.3.0', '>=');
+
+        $composerJson = json_decode(file_get_contents($rootPath.'/composer.json'), true);
+
+        if (! is_array ($composerJson) || ! array_key_exists('require', $composerJson)) {
+            return $fallback;
+        }
+
+        if (! array_key_exists('php', $composerJson['require'])) {
+            return $fallback;
+        }
+
+        $phpVersion = ltrim($composerJson['require']['php'], '^>=~');
+
+        $isOwnPackage = $composerJson['name'] ?? '' === 'pestphp/pest-plugin-type-coverage';
+
+        return version_compare($phpVersion, '8.3.0', '>=') || $isOwnPackage;
+    }
 }