feat(bubble): add waiting bubble for new AI agent requests

.gitignore

@@ -1,6 +1,7 @@
 node_modules
 dist
 
+.idea
 *.log
 .DS_Store
 .eslintcache

playground/src/Chat.tsx

@@ -42,7 +42,10 @@ export function Chat() {
   if (!backend) {
     throw new Error("Backend is not initialized");
   }
-  const { messages, input, setMessages } = useChat(backend, initialMessages);
+  const { messages, input, setMessages, isPending } = useChat(
+    backend,
+    initialMessages,
+  );
 
   const onClear = () => {
     setPrompt("");
@@ -57,6 +60,7 @@ export function Chat() {
             className="px-4 w-full max-w-full"
             messages={messages}
             background="right-solid"
+            isPending={isPending}
             footer={
               <Button
                 onClick={onClear}

src/bubble.tsx

@@ -89,6 +89,16 @@ export interface BubbleProps
    * @default "solid"
    */
   background?: "transparent" | "solid";
+  /**
+   * Custom pending content to display when pending is true.
+   * @description If not provided, will use default dots animation.
+   */
+  pending?: React.ReactNode;
+  /**
+   * Whether the bubble is in pending state.
+   * @default false
+   */
+  isPending?: boolean;
 }
 
 export function Bubble({
@@ -97,10 +107,26 @@ export function Bubble({
   size,
   align,
   background = "solid",
+  pending,
+  isPending = false,
   ...props
 }: BubbleProps) {
   const { isDark } = useTheme();
 
+  const defaultPending = (
+    <div className="flex items-center space-x-1 py-1">
+      <div className="w-2 h-2 bg-gray-400 rounded-full animate-bounce" />
+      <div
+        className="w-2 h-2 bg-gray-400 rounded-full animate-bounce"
+        style={{ animationDelay: "0.1s" }}
+      />
+      <div
+        className="w-2 h-2 bg-gray-400 rounded-full animate-bounce"
+        style={{ animationDelay: "0.2s" }}
+      />
+    </div>
+  );
+
   return (
     <div
       data-slot="bubble"
@@ -112,50 +138,55 @@ export function Bubble({
             align,
             background,
           }),
+          pending && "flex items-center",
         ),
       )}
       {...props}
     >
-      <Markdown
-        remarkPlugins={[remarkGfm, remarkMath]}
-        components={{
-          code(props) {
-            const { children, className, ref: _ref, ...rest } = props;
-            const match = /language-(\w+)/.exec(className || "");
-            return match ? (
-              <div className="w-full overflow-x-auto border border-gray-300 dark:border-gray-700 bg-gray-100 dark:bg-gray-800 rounded-lg">
-                <SyntaxHighlighter
-                  {...rest}
-                  PreTag="div"
-                  language={match[1]}
-                  style={isDark ? vscDarkPlus : oneLight}
-                  customStyle={{
-                    background: "transparent",
-                    margin: 0,
-                    padding: "1rem",
-                    borderRadius: "0.5rem",
-                    overflowX: "auto",
-                  }}
-                  codeTagProps={{
-                    style: {
-                      fontFamily: "monospace",
-                      fontSize: "0.875rem",
-                    },
-                  }}
-                >
-                  {String(children).replace(/\n$/, "")}
-                </SyntaxHighlighter>
-              </div>
-            ) : (
-              <code {...rest} className={className}>
-                {children}
-              </code>
-            );
-          },
-        }}
-      >
-        {text}
-      </Markdown>
+      {isPending ? (
+        pending || defaultPending
+      ) : (
+        <Markdown
+          remarkPlugins={[remarkGfm, remarkMath]}
+          components={{
+            code(props) {
+              const { children, className, ref: _ref, ...rest } = props;
+              const match = /language-(\w+)/.exec(className || "");
+              return match ? (
+                <div className="w-full overflow-x-auto border border-gray-300 dark:border-gray-700 bg-gray-100 dark:bg-gray-800 rounded-lg">
+                  <SyntaxHighlighter
+                    {...rest}
+                    PreTag="div"
+                    language={match[1]}
+                    style={isDark ? vscDarkPlus : oneLight}
+                    customStyle={{
+                      background: "transparent",
+                      margin: 0,
+                      padding: "1rem",
+                      borderRadius: "0.5rem",
+                      overflowX: "auto",
+                    }}
+                    codeTagProps={{
+                      style: {
+                        fontFamily: "monospace",
+                        fontSize: "0.875rem",
+                      },
+                    }}
+                  >
+                    {String(children).replace(/\n$/, "")}
+                  </SyntaxHighlighter>
+                </div>
+              ) : (
+                <code {...rest} className={className}>
+                  {children}
+                </code>
+              );
+            },
+          }}
+        >
+          {text}
+        </Markdown>
+      )}
     </div>
   );
 }
@@ -202,13 +233,27 @@ export interface BubbleListProps extends React.ComponentProps<"div"> {
    * @default "right-solid"
    */
   background?: "transparent" | "solid" | "left-solid" | "right-solid";
+  isPending?: boolean;
+  assistant?: {
+    avatar?: AvatarProps;
+    align?: "left" | "right";
+  };
   footer?: React.ReactNode;
+  pending?: React.ReactNode;
 }
 
 export function BubbleList({
   className,
   background = "right-solid",
   footer,
+  pending,
+  assistant = {
+    avatar: {
+      text: "A",
+    },
+    align: "left",
+  },
+  isPending = true,
   ...props
 }: BubbleListProps) {
   const { messages } = props;
@@ -222,7 +267,7 @@ export function BubbleList({
         block: "end",
       });
     }
-  }, [messages]);
+  }, [messages, isPending]);
 
   return (
     <div
@@ -269,6 +314,33 @@ export function BubbleList({
             />
           </div>
         ))}
+        {isPending && (
+          <div
+            key="pending"
+            data-slot="bubble-item"
+            className={twMerge(
+              clsx(assistant?.align === "right" && "flex-row-reverse"),
+              "flex items-start gap-2 w-full",
+            )}
+          >
+            <Avatar className="flex-shrink-0" {...(assistant?.avatar || {})} />
+            <Bubble
+              isPending={isPending}
+              pending={pending}
+              text=""
+              align={assistant?.align || "left"}
+              background={
+                (background === "left-solid" &&
+                  (assistant?.align || "left") === "left") ||
+                (background === "right-solid" &&
+                  (assistant?.align || "left") === "right") ||
+                background === "solid"
+                  ? "solid"
+                  : "transparent"
+              }
+            />
+          </div>
+        )}
       </div>
       {footer && (
         <div

src/utils/chat.ts

@@ -10,10 +10,13 @@ export function useChat(
   input: (prompt: string, options?: InputOptions) => Promise<void>;
   on: <K extends EventTypes["type"]>(type: K, handler: Events[K]) => () => void;
   setMessages: React.Dispatch<React.SetStateAction<MessageParam[]>>;
+  isPending: boolean;
 } {
   const [messages, setMessages] = useState<MessageParam[]>(initialMessages);
+  const [isPending, setIsPending] = useState(false);
 
   const input = async (prompt: string, options?: InputOptions) => {
+    setIsPending(true);
     return backend.input(prompt, {
       messages,
       ...options,
@@ -47,6 +50,7 @@ export function useChat(
         setMessages((prevMessages) => [...prevMessages, event.payload]);
       }),
       backend.on("error", (event) => {
+        setIsPending(false);
         console.error("Error from backend:", event.payload.error);
         setMessages((prevMessages) => [
           ...prevMessages,
@@ -58,7 +62,11 @@ export function useChat(
           },
         ]);
       }),
+      backend.on("finish", (event) => {
+        setIsPending(false);
+      }),
       backend.on("chunk", (event) => {
+        setIsPending(false);
         setMessages((prev) => {
           const lastMessage = prev[prev.length - 1];
           if (lastMessage && lastMessage.role === "assistant") {
@@ -92,5 +100,5 @@ export function useChat(
     };
   }, [backend]);
 
-  return { messages, input, on, setMessages };
+  return { messages, input, on, setMessages, isPending };
 }