From 9ec63f818787544eb709c8890836d56e7b01a8f1 Mon Sep 17 00:00:00 2001
From: Tyler Goodlet <jgbt@protonmail.com>
Date: Sat, 8 Mar 2025 15:49:21 -0500
Subject: [PATCH] Offer a `mods: list` to `dec_type_union()`; drop importing
 this-mod

---
 tractor/msg/_exts.py | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/tractor/msg/_exts.py b/tractor/msg/_exts.py
index abf7bcd..31eafb5 100644
--- a/tractor/msg/_exts.py
+++ b/tractor/msg/_exts.py
@@ -33,6 +33,9 @@ converters,
   |_ https://jcristharif.com/msgspec/changelog.html
 
 '''
+from types import (
+    ModuleType,
+)
 import typing
 from typing import (
     Type,
@@ -41,19 +44,20 @@ from typing import (
 
 def dec_type_union(
     type_names: list[str],
-) -> Type:
+    mods: list[ModuleType] = []
+) -> Type|Union[Type]:
     '''
     Look up types by name, compile into a list and then create and
     return a `typing.Union` from the full set.
 
     '''
-    import importlib
+    # import importlib
     types: list[Type] = []
     for type_name in type_names:
         for mod in [
             typing,
-            importlib.import_module(__name__),
-        ]:
+            # importlib.import_module(__name__),
+        ] + mods:
             if type_ref := getattr(
                 mod,
                 type_name,