Various code cleanup.

app/Services/Internal/Support/JournalServiceTrait.php

@@ -39,6 +39,7 @@ use FireflyIII\Rules\UniqueIban;
 use FireflyIII\Support\NullArrayObject;
 use Illuminate\Support\Facades\Log;
 
+use Safe\Exceptions\JsonException;
 use function Safe\json_encode;
 
 /**
@@ -265,7 +266,13 @@ trait JournalServiceTrait
     }
 
     /**
+     * @param Account|null $account
+     * @param array        $data
+     * @param string       $preferredType
+     *
+     * @return Account|null
      * @throws FireflyException
+     * @throws JsonException
      */
     private function createAccount(?Account $account, array $data, string $preferredType): ?Account
     {