fix(mistral-ai): hub.pull with ChatMistralAI auto-instanciate (#9081)

Co-authored-by: Hunter Lovell <[email protected]>
Co-authored-by: Hunter Lovell <[email protected]>

Author: vincentmavieenlivre

.changeset/strong-drinks-sell.md

@@ -0,0 +1,5 @@
+---
+"langchain": patch
+---
+
+fix(langchain): add ChatMistralAI to well known models

langchain/src/hub/base.ts

@@ -112,6 +112,8 @@ export function generateModelImportMap(
       importMapKey = "chat_models__google_genai";
     } else if (modelLcName === "ChatBedrockConverse") {
       importMapKey = "chat_models__chat_bedrock_converse";
+    } else if (modelLcName === "ChatMistralAI") {
+      importMapKey = "chat_models__mistralai";
     } else if (modelLcName === "ChatMistral") {
       importMapKey = "chat_models__mistralai";
     } else if (modelLcName === "ChatFireworks") {

langchain/src/hub/node.ts

@@ -77,6 +77,8 @@ export async function pull<T extends Runnable>(
           .ChatGoogleGenerativeAI;
       } else if (modelName === "ChatBedrockConverse") {
         modelClass = (await import("@langchain/aws")).ChatBedrockConverse;
+      } else if (modelName === "ChatMistralAI") {
+        modelClass = (await import("@langchain/mistralai")).ChatMistralAI;
       } else if (modelName === "ChatMistral") {
         modelClass = (await import("@langchain/mistralai")).ChatMistralAI;
       } else if (modelName === "ChatGroq") {