Fix side effect

Author: nfcampos

langchain/src/util/hub.ts

@@ -2,18 +2,6 @@ import { backOff } from "exponential-backoff";
 
 import { fetchWithTimeout, extname, FileLoader, LoadValues } from "./index.js";
 
-const LANGCHAIN_HUB_DEFAULT_REF =
-  (typeof process !== "undefined"
-    ? // eslint-disable-next-line no-process-env
-      process.env.LANGCHAIN_HUB_DEFAULT_REF
-    : undefined) ?? "master";
-const LANGCHAIN_HUB_URL_BASE =
-  (typeof process !== "undefined"
-    ? // eslint-disable-next-line no-process-env
-      process.env.LANGCHAIN_HUB_URL_BASE
-    : undefined) ??
-  "https://raw.githubusercontent.com/hwchase17/langchain-hub/";
-
 const HUB_PATH_REGEX = /lc(@[^:]+)?:\/\/(.*)/;
 
 const URL_PATH_SEPARATOR = "/";
@@ -25,6 +13,18 @@ export const loadFromHub = async <T>(
   validSuffixes: Set<string>,
   values: LoadValues = {}
 ): Promise<T | undefined> => {
+  const LANGCHAIN_HUB_DEFAULT_REF =
+    (typeof process !== "undefined"
+      ? // eslint-disable-next-line no-process-env
+        process.env.LANGCHAIN_HUB_DEFAULT_REF
+      : undefined) ?? "master";
+  const LANGCHAIN_HUB_URL_BASE =
+    (typeof process !== "undefined"
+      ? // eslint-disable-next-line no-process-env
+        process.env.LANGCHAIN_HUB_URL_BASE
+      : undefined) ??
+    "https://raw.githubusercontent.com/hwchase17/langchain-hub/";
+
   const match = uri.match(HUB_PATH_REGEX);
   if (!match) {
     return undefined;