fix(langchain): remove bad dynamic import for LS (#9271)

Author: hntrl

.changeset/nervous-carpets-tie.md

@@ -0,0 +1,5 @@
+---
+"langchain": patch
+---
+
+fix(langchain): remove bad dynamic import for LS

libs/langchain/package.json

@@ -49,7 +49,6 @@
     "dotenv": "^16.0.3",
     "dpdm": "^3.14.0",
     "eslint": "^9.34.0",
-    "langsmith": "^0.3.64",
     "openai": "^5.1.0",
     "peggy": "^3.0.2",
     "prettier": "^2.8.3",
@@ -67,12 +66,10 @@
   "dependencies": {
     "@langchain/langgraph": "^1.0.0",
     "@langchain/langgraph-checkpoint": "^1.0.0",
+    "langsmith": "~0.3.74",
     "uuid": "^10.0.0",
     "zod": "^3.25.76 || ^4"
   },
-  "optionalDependencies": {
-    "langsmith": "^0.3.64"
-  },
   "publishConfig": {
     "access": "public"
   },

libs/langchain/src/hub/base.ts

@@ -1,7 +1,7 @@
 import type { BaseLanguageModel } from "@langchain/core/language_models/base";
 import type { Runnable } from "@langchain/core/runnables";
 
-import type { Client, ClientConfig } from "langsmith";
+import { Client } from "langsmith";
 import type { PromptCommit } from "langsmith/schemas";
 
 /**
@@ -25,7 +25,6 @@ export async function basePush(
     tags?: string[];
   }
 ): Promise<string> {
-  const Client = await loadLangSmith();
   const client = new Client(options);
   const payloadOptions = {
     object: runnable,
@@ -42,7 +41,6 @@ export async function basePull(
   ownerRepoCommit: string,
   options?: { apiKey?: string; apiUrl?: string; includeModel?: boolean }
 ): Promise<PromptCommit> {
-  const Client = await loadLangSmith();
   const client = new Client(options);
 
   const promptObject = await client.pullPromptCommit(ownerRepoCommit, {
@@ -188,20 +186,3 @@ export function bindOutputSchema<T extends Runnable>(loadedSequence: T) {
   }
   return loadedSequence;
 }
-
-/**
- * Dynamically load the LangSmith client.
- * @returns The LangSmith client.
- */
-async function loadLangSmith(): Promise<new (config?: ClientConfig) => Client> {
-  try {
-    const { Client } = await import("langsmith");
-    return Client;
-  } catch (error) {
-    // eslint-disable-next-line no-instanceof/no-instanceof
-    const errorMessage = error instanceof Error ? error.message : String(error);
-    throw new Error(
-      `Error loading "langsmith" package, install it via \`npm install langsmith\` before you use this function.\nError: ${errorMessage}`
-    );
-  }
-}