I'm going to keep this very short and sweet, as if you're here you've probably spent time figuring out why you get weird errors such as:

TypeError: getDefaultAgent is not a function

when using openai or anthropic packages.

Summary

Using Newrelic’s suggested approach to initialization on ESM projects can sometimes break packages like openai-node and anthropic-ai. This guide provides a simple workaround using a custom loader to exclude these packages from being intercepted, ensuring your application runs smoothly and Newrelic Agent bootstraps correctly.

Related issues

I also assume you probably went through these issues as you searched for a solution, without success. If not, it's worth going through them to understand the underlying issue, which I'm not going to explore here:

• langchain-ai
• openai-node
• sentry-javascript

Quick Solution

Create loader.mjs in your project root:

// loader.mjs
import { register } from "node:module";

register("import-in-the-middle/hook.mjs", import.meta.url, {
  parentURL: import.meta.url,
  data: { exclude: [/openai/] } // Use [/anthropic/] if anthropic packages are affected
});

Start your service using:

node --import ./loader.mjs -r newrelic ./dist

Double check that you still see logs in Newrelic. I recommend setting up an alert if no logs are pushed to Newrelic for a while, for safety.

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