feat(community): Groq multimodal support

libs/langchain-groq/src/chat_models.ts

@@ -315,9 +315,6 @@ function convertMessagesToGroqParams(
   messages: BaseMessage[]
 ): Array<ChatCompletionsAPI.ChatCompletionMessage> {
   return messages.map((message): ChatCompletionsAPI.ChatCompletionMessage => {
-    if (typeof message.content !== "string") {
-      throw new Error("Non string message content not supported");
-    }
     // eslint-disable-next-line @typescript-eslint/no-explicit-any
     const completionParam: Record<string, any> = {
       role: messageToGroqRole(message),

libs/langchain-groq/src/tests/chat_models.int.test.ts

@@ -281,3 +281,32 @@ test("response metadata includes groq metadata when streaming", async () => {
   // console.dir(finalRes, { depth: Infinity });
   expect(finalRes?.response_metadata.x_groq?.id).toBeDefined();
 });
+
+test("invoke with image input", async () => {
+  const chat = new ChatGroq({
+    maxRetries: 0,
+    model: "meta-llama/llama-4-scout-17b-16e-instruct",
+  });
+  const message = new HumanMessage({
+    content: [
+      {
+        type: "text",
+        text: "What's in this image?",
+      },
+      {
+        type: "image_url",
+        image_url: {
+          url: "https://www.google.com/images/branding/googlelogo/1x/googlelogo_color_272x92dp.png",
+        },
+      },
+    ],
+  });
+  const res = await chat.invoke([message]);
+
+  expect(res.content.length).toBeGreaterThan(10);
+  expect(typeof res.content).toBe("string");
+  // The response should contain some reference to Google or logo
+  expect((res.content as string).toLowerCase()).toMatch(
+    /google|logo|text|image/
+  );
+});