Updated PHPStan generics definition on generators

Author: gplanchat

src/ExtractorInterface.php

@@ -10,7 +10,7 @@ interface ExtractorInterface
     /**
      * Extract data from the given source.
      *
-     * @return iterable<ResultBucketInterface<Type>>
+     * @return iterable<ResultBucketInterface<null|Type>>
      */
     public function extract(): iterable;
 }

src/LoaderInterface.php

@@ -10,7 +10,7 @@ interface LoaderInterface
     /**
      * Loads data in the given sink.
      *
-     * @return \Generator<mixed, Type, ResultBucketInterface<Type>, void>
+     * @return \Generator<mixed, ResultBucketInterface<Type>|ResultBucketInterface<void>, null|Type, void>
      */
     public function load(): \Generator;
 }

src/TransformerInterface.php

@@ -10,7 +10,7 @@ interface TransformerInterface
     /**
      * Transforms the data from one format to another.
      *
-     * @return \Generator<mixed, Type, ResultBucketInterface<Type>, void>
+     * @return \Generator<mixed, ResultBucketInterface<Type>|ResultBucketInterface<void>, null|Type, void>
      */
     public function transform(): \Generator;
 }