Fix typing issues

Author: cpsievert

shiny/ui/_chat.py

@@ -489,7 +489,7 @@ def messages(
                     transform_user == "last" and i == len(messages) - 1
                 )
             content_key = m["transform_key" if transform else "pre_transform_key"]
-            chat_msg = ChatMessage(content=m[content_key], role=m["role"])
+            chat_msg = ChatMessage(content=str(m[content_key]), role=m["role"])
             if not isinstance(format, MISSING_TYPE):
                 chat_msg = as_provider_message(chat_msg, format)
             res.append(chat_msg)
@@ -790,7 +790,7 @@ async def _transform_message(
         if content is None:
             return None
 
-        res[key] = content
+        res[key] = content  # type: ignore
 
         return res
 
@@ -950,7 +950,7 @@ def user_input(self, transform: bool = False) -> str | None:
         if msg is None:
             return None
         key = "content_server" if transform else "content_client"
-        return msg[key]
+        return str(msg[key])
 
     def _user_input(self) -> str:
         id = self.user_input_id

shiny/ui/_chat_types.py

@@ -2,6 +2,8 @@
 
 from typing import Literal, TypedDict
 
+from htmltools import HTML
+
 Role = Literal["assistant", "user", "system"]
 
 
@@ -14,14 +16,16 @@ class ChatMessage(TypedDict):
 
 # A message once transformed have been applied
 class TransformedMessage(TypedDict):
-    content_client: str
+    content_client: str | HTML
     content_server: str
     role: Role
     transform_key: Literal["content_client", "content_server"]
     pre_transform_key: Literal["content_client", "content_server"]
 
 
 # A message that can be sent to the client
-class ClientMessage(ChatMessage):
+class ClientMessage(TypedDict):
+    content: str | HTML
+    role: Role
     content_type: Literal["markdown", "html"]
     chunk_type: Literal["message_start", "message_end"] | None

tests/playwright/shiny/components/chat/transform_assistant/app.py

@@ -12,7 +12,7 @@
 
 # TODO: test with append_message_stream() as well
 @chat.transform_assistant_response
-def transform(content: str) -> str:
+def transform(content: str) -> str | ui.HTML:
     if content == "return HTML":
         return ui.HTML(f"<b>Transformed response</b>: {content}")
     else: