app/node_modules/@langchain/core/dist/tracers/initialize.js

import { LangChainTracer } from "./tracer_langchain.js";
import { LangChainTracerV1 } from "./tracer_langchain_v1.js";
/**
 * @deprecated Use the V2 handler instead.
 *
 * Function that returns an instance of `LangChainTracerV1`. If a session
 * is provided, it loads that session into the tracer; otherwise, it loads
 * a default session.
 * @param session Optional session to load into the tracer.
 * @returns An instance of `LangChainTracerV1`.
 */
export async function getTracingCallbackHandler(session) {
    const tracer = new LangChainTracerV1();
    if (session) {
        await tracer.loadSession(session);
    }
    else {
        await tracer.loadDefaultSession();
    }
    return tracer;
}
/**
 * @deprecated Instantiate directly using the LangChainTracer constructor.
 *
 * Function that returns an instance of `LangChainTracer`. It does not
 * load any session data.
 * @returns An instance of `LangChainTracer`.
 */
export async function getTracingV2CallbackHandler() {
    return new LangChainTracer();
}