Fix PHPStan warnings

Author: giggsey

build/BuildMetadataPHPFromXml.php

@@ -71,6 +71,10 @@ private function writeMetadataToFile(array $metadataCollection, string $director
 
             $pos = strrpos($namespaceAndClassPrefix, '\\');
 
+            if ($pos === false) {
+                throw new \RuntimeException('Invalid namespaceAndClassPrefix: ' . $namespaceAndClassPrefix);
+            }
+
             $namespace = substr($namespaceAndClassPrefix, 0, $pos);
             $classPrefix = substr($namespaceAndClassPrefix, $pos + 1);
 

build/Builders/PhoneMetadataBuilder.php

@@ -16,7 +16,6 @@
 
 /**
  * @internal
- * @phpstan-import-type PhoneNumberDescArray from PhoneNumberDesc
  */
 class PhoneMetadataBuilder extends PhoneMetadata
 {
@@ -360,7 +359,7 @@ public function toFile(string $className, string $namespaceName): PhpFile
                     $class->removeProperty($property->getName());
 
                     if (!$propertyValue instanceof PhoneNumberDesc) {
-                        throw new RuntimeException('Unsupported type: ' . gettype($value));
+                        throw new RuntimeException('Unsupported type: ' . gettype($propertyValue));
                     }
 
                     $chained = [];

src/MultiFileMetadataSourceImpl.php

@@ -69,7 +69,6 @@ public function loadMetadataFromFile(string $filePrefix, string $regionCode, int
 
         $isNonGeoRegion = PhoneNumberUtil::REGION_CODE_FOR_NON_GEO_ENTITY === $regionCode;
 
-
         $class = $filePrefix . ($isNonGeoRegion ? $countryCallingCode : ucfirst($regionCode));
 
         if (!class_exists($class)) {
@@ -78,6 +77,10 @@ public function loadMetadataFromFile(string $filePrefix, string $regionCode, int
 
         $metadata = new $class();
 
+        if (!$metadata instanceof PhoneMetadata) {
+            throw new RuntimeException('invalid metadata: ' . $class);
+        }
+
         if ($isNonGeoRegion) {
             $this->countryCodeToNonGeographicalMetadataMap[$countryCallingCode] = $metadata;
         } else {