[js] Support LangSmith-prefixed env vars

js/package.json

@@ -1,6 +1,6 @@
 {
   "name": "langsmith",
-  "version": "0.1.41",
+  "version": "0.1.42",
   "description": "Client library to connect to the LangSmith LLM Tracing and Evaluation Platform.",
   "packageManager": "[email protected]",
   "files": [

js/src/client.ts

@@ -37,8 +37,8 @@ import {
   isLangChainMessage,
 } from "./utils/messages.js";
 import {
-  getEnvironmentVariable,
   getLangChainEnvVarsMetadata,
+  getLangSmithEnvironmentVariable,
   getRuntimeEnvironment,
 } from "./utils/env.js";
 
@@ -286,16 +286,16 @@ async function mergeRuntimeEnvIntoRunCreates(runs: RunCreate[]) {
 }
 
 const getTracingSamplingRate = () => {
-  const samplingRateStr = getEnvironmentVariable(
-    "LANGCHAIN_TRACING_SAMPLING_RATE"
+  const samplingRateStr = getLangSmithEnvironmentVariable(
+    "TRACING_SAMPLING_RATE"
   );
   if (samplingRateStr === undefined) {
     return undefined;
   }
   const samplingRate = parseFloat(samplingRateStr);
   if (samplingRate < 0 || samplingRate > 1) {
     throw new Error(
-      `LANGCHAIN_TRACING_SAMPLING_RATE must be between 0 and 1 if set. Got: ${samplingRate}`
+      `LANGSMITH_TRACING_SAMPLING_RATE must be between 0 and 1 if set. Got: ${samplingRate}`
     );
   }
   return samplingRate;
@@ -463,14 +463,14 @@ export class Client {
     hideInputs?: boolean;
     hideOutputs?: boolean;
   } {
-    const apiKey = getEnvironmentVariable("LANGCHAIN_API_KEY");
+    const apiKey = getLangSmithEnvironmentVariable("API_KEY");
     const apiUrl =
-      getEnvironmentVariable("LANGCHAIN_ENDPOINT") ??
+      getLangSmithEnvironmentVariable("ENDPOINT") ??
       "https://api.smith.langchain.com";
     const hideInputs =
-      getEnvironmentVariable("LANGCHAIN_HIDE_INPUTS") === "true";
+      getLangSmithEnvironmentVariable("HIDE_INPUTS") === "true";
     const hideOutputs =
-      getEnvironmentVariable("LANGCHAIN_HIDE_OUTPUTS") === "true";
+      getLangSmithEnvironmentVariable("HIDE_OUTPUTS") === "true";
     return {
       apiUrl: apiUrl,
       apiKey: apiKey,
@@ -1017,7 +1017,7 @@ export class Client {
         sessionId = projectOpts?.projectId;
       } else {
         const project = await this.readProject({
-          projectName: getEnvironmentVariable("LANGCHAIN_PROJECT") || "default",
+          projectName: getLangSmithEnvironmentVariable("PROJECT") || "default",
         });
         sessionId = project.id;
       }

js/src/env.ts

@@ -1,14 +1,11 @@
-import { getEnvironmentVariable } from "./utils/env.js";
+import { getLangSmithEnvironmentVariable } from "./utils/env.js";
 
 export const isTracingEnabled = (tracingEnabled?: boolean): boolean => {
   if (tracingEnabled !== undefined) {
     return tracingEnabled;
   }
-  const envVars = [
-    "LANGSMITH_TRACING_V2",
-    "LANGCHAIN_TRACING_V2",
-    "LANGSMITH_TRACING",
-    "LANGCHAIN_TRACING",
-  ];
-  return !!envVars.find((envVar) => getEnvironmentVariable(envVar) === "true");
+  const envVars = ["TRACING_V2", "TRACING"];
+  return !!envVars.find(
+    (envVar) => getLangSmithEnvironmentVariable(envVar) === "true"
+  );
 };

js/src/evaluation/_runner.ts

@@ -882,7 +882,7 @@ async function _forward(
   if (!run) {
     throw new Error(`Run not created by target function.
 This is most likely due to tracing not being enabled.\n
-Try setting "LANGCHAIN_TRACING_V2=true" in your environment.`);
+Try setting "LANGSMITH_TRACING=true" in your environment.`);
   }
 
   return {

js/src/index.ts

@@ -12,4 +12,4 @@ export type {
 export { RunTree, type RunTreeConfig } from "./run_trees.js";
 
 // Update using yarn bump-version
-export const __version__ = "0.1.41";
+export const __version__ = "0.1.42";

js/src/utils/env.ts

@@ -200,6 +200,15 @@ export function getEnvironmentVariable(name: string): string | undefined {
   }
 }
 
+export function getLangSmithEnvironmentVariable(
+  name: string
+): string | undefined {
+  return (
+    getEnvironmentVariable(`LANGSMITH_${name}`) ||
+    getEnvironmentVariable(`LANGCHAIN_${name}`)
+  );
+}
+
 export function setEnvironmentVariable(name: string, value: string): void {
   if (typeof process !== "undefined") {
     // eslint-disable-next-line no-process-env