Callbacks Refactor [base] (#3256)

Co-authored-by: Nuno Campos <nuno@boringbits.io>
Co-authored-by: Davis Chase <130488702+dev2049@users.noreply.github.com>
Co-authored-by: Zander Chase <130414180+vowelparrot@users.noreply.github.com>
Co-authored-by: Harrison Chase <hw.chase.17@gmail.com>

langchain/chains/transform.py

@@ -1,6 +1,7 @@
 """Chain that runs an arbitrary python function."""
-from typing import Callable, Dict, List
+from typing import Callable, Dict, List, Optional
 
+from langchain.callbacks.manager import CallbackManagerForChainRun
 from langchain.chains.base import Chain
 
 
@@ -35,5 +36,9 @@ class TransformChain(Chain):
         """
         return self.output_variables
 
-    def _call(self, inputs: Dict[str, str]) -> Dict[str, str]:
+    def _call(
+        self,
+        inputs: Dict[str, str],
+        run_manager: Optional[CallbackManagerForChainRun] = None,
+    ) -> Dict[str, str]:
         return self.transform(inputs)