TypeError: getDefaultAgent is not a function

[guidev]

Confirm this is a Node library issue and not an underlying OpenAI API issue

• This is an issue with the Node library

Describe the bug

When using openai-node with langchain and datadog, ESM, I get the following error:

TypeError: getDefaultAgent is not a function
    at OpenAI.buildRequest (file:https:///Users/name/Progetti/nonworking/node_modules/openai/core.mjs:208:66)
    at OpenAI.makeRequest (file:https:///Users/name/Progetti/nonworking/node_modules/openai/core.mjs:279:44)
    at async file:https:///Users/name/Progetti/nonworking/node_modules/@langchain/openai/dist/chat_models.js:796:29
    at async RetryOperation._fn (/Users/name/Progetti/nonworking/node_modules/p-retry/index.js:50:12)

Node.js v22.3.0

To Reproduce

1. git clone https://github.com/guidev/nonworking/tree/node20

2. npm run start 

Code snippets

No response

OS

macOS

Node version

node 20, node 22

Library version

4.52.0

[dgellow]

Hi @guidev,

Thanks for the bug report, and I appreciate the repo example to reproduce the issue. Looking into it.

[ericallam]

@dgellow this is an issue with import-in-the-middle, it somehow breaks the shims system. I've recreated the issue as a failing test in the import-in-the-middle repo here: nodejs/import-in-the-middle#113

[rattrayalex]

Thanks for reporting.

Closing this issue as it seems like an import-in-the-middle bug. Hopefully it gets fixed there.

It's possible we'll be able to substantially reduce or eliminate our shims systems once we drop node-fetch as a dependency, which could solve this, but we won't target it specifically.

Members of the community are welcome to share workaround here, but I encourage you to otherwise bring this up with import-in-the-middle or datadog.

[rattrayalex]

One possible workaround you could try would be to explicitly import 'openai/shims/node' or import 'openai/shims/web' before your first import … from 'openai'

[ericallam]

@rattrayalex this isn't solved by importing the shim manually, that just results in a different error. The way to fix this is with the latest version of import-in-the-middle and writing your own loader:

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

register("import-in-the-middle/hook.mjs", import.meta.url, {
  parentURL: import.meta.url,
  data: { include: ["openai"]}, // this is the import bit here
});

Then running in node with node --import ./loader.mjs ...

[adam-on-tailwind]

FYI the loader.mjs workaround prevented the error in my project, but also stopped traces from being sent. The way I was able to fix this was by importing the openai web shims using the --import flag, enabling experimental fetch --experimental-fetch and supplying an http Agent to the openai client at initialization.

Start node like this:

node --import openai/shims/web --import dd-trace/register.js --require dd-trace/init --experimental-fetch src/main/index.js

When initializing the openai client:

import 'http'
import OpenAI from 'openai'

const openai = new OpenAI({
  httpAgent: new http.Agent()
})

And it all works! Same steps apply if you're using Anthropic btw.