Add native ComfyUI list output converter

nodes.py

@@ -6,6 +6,37 @@ from collections.abc import Mapping
 from copy import deepcopy
 
 
+class AnyType(str):
+    """ComfyUI wildcard socket type for a list whose item type is not fixed."""
+
+    def __ne__(self, other):
+        return False
+
+
+ANY_TYPE = AnyType("*")
+
+
+class ETKListToComfyList:
+    @classmethod
+    def INPUT_TYPES(cls):
+        return {
+            "required": {
+                "items": ("LIST", {"default": []}),
+            }
+        }
+
+    RETURN_TYPES = (ANY_TYPE,)
+    RETURN_NAMES = ("items",)
+    OUTPUT_IS_LIST = (True,)
+    FUNCTION = "convert"
+    CATEGORY = "ETK/List"
+
+    def convert(self, items):
+        if not isinstance(items, list):
+            raise TypeError(f"items must be a LIST, got {type(items).__name__}")
+        return (items,)
+
+
 class ImageFromListIdx:
     @classmethod
     def INPUT_TYPES(cls):