Issue #3238915: Refactor (if feasible) uses of the jQuery ready function to use VanillaJS

core/modules/migrate/src/Plugin/migrate/process/MigrationLookup.php

@@ -263,7 +263,7 @@ public function transform($value, MigrateExecutableInterface $migrate_executable
         throw $e;
       }
       catch (\Exception $e) {
-        throw new MigrateException(sprintf('A(n) %s was thrown while attempting to stub.', gettype($e)), $e->getCode(), $e);
+        throw new MigrateException(sprintf('%s was thrown while attempting to stub: %s', get_class($e), $e->getMessage()), $e->getCode(), $e);
       }
     }
     if ($destination_ids) {