app/node_modules/@langchain/core/dist/singletons/tracer.js

import { Client } from "langsmith";
import { getEnvironmentVariable } from "../utils/env.js";
let client;
export const getDefaultLangChainClientSingleton = () => {
    if (client === undefined) {
        const clientParams = getEnvironmentVariable("LANGCHAIN_CALLBACKS_BACKGROUND") === "false"
            ? {
                // LangSmith has its own backgrounding system
                blockOnRootRunFinalization: true,
            }
            : {};
        client = new Client(clientParams);
    }
    return client;
};
export const setDefaultLangChainClientSingleton = (newClient) => {
    client = newClient;
};