Don't include html_deps in client message unless they're actually present

Author: cpsievert

js/chat/chat.ts

@@ -27,7 +27,7 @@ type ShinyChatMessage = {
   handler: string;
   // Message keys will create custom element attributes, but html_deps are handled
   // separately
-  obj: Message & { html_deps: HtmlDep[] };
+  obj: Message & { html_deps?: HtmlDep[] };
 };
 
 type UpdateUserInput = {

js/markdown-stream/markdown-stream.ts

@@ -24,7 +24,7 @@ type ContentMessage = {
   id: string;
   content: string;
   operation: "append" | "replace";
-  html_deps: HtmlDep[];
+  html_deps?: HtmlDep[];
 };
 
 type IsStreamingMessage = {

shiny/ui/_chat.py

@@ -759,12 +759,15 @@ async def _send_append_message(
             role=message["role"],
             content_type=content_type,
             chunk_type=chunk_type,
-            html_deps=message.get("html_deps", []),
         )
 
         if icon is not None:
             msg["icon"] = str(icon)
 
+        deps = message.get("html_deps", [])
+        if deps:
+            msg["html_deps"] = deps
+
         # print(msg)
 
         await self._send_custom_message(msg_type, msg)

shiny/ui/_chat_types.py

@@ -34,4 +34,4 @@ class ClientMessage(TypedDict):
     content_type: Literal["markdown", "html"]
     chunk_type: Literal["message_start", "message_end"] | None
     icon: NotRequired[str]
-    html_deps: list[dict[str, str]]
+    html_deps: NotRequired[list[dict[str, str]]]