Fixed missing PorterAware injection in transformAsync().

Author: Bilge

src/Porter.php

@@ -212,7 +212,7 @@ private function transformRecords(RecordCollection $records, array $transformers
 
     private function transformAsync(Iterator $records, array $transformers, $context): Producer
     {
-        return new Producer(static function (\Closure $emit) use ($records, $transformers, $context) {
+        return new Producer(function (\Closure $emit) use ($records, $transformers, $context) {
             while (yield $records->advance()) {
                 $record = $records->getCurrent();
 
@@ -221,6 +221,9 @@ private function transformAsync(Iterator $records, array $transformers, $context
                         // TODO: Proper exception or separate async stack.
                         throw new \RuntimeException('Cannot use sync transformer.');
                     }
+                    if ($transformer instanceof PorterAware) {
+                        $transformer->setPorter($this);
+                    }
 
                     $record = yield $transformer->transformAsync($record, $context);