require-in-the-middle throws in ESM (with bun and pm2?)

[The-LukeZ]

Is there an existing issue for this?

• I have checked for existing issues https://github.com/getsentry/sentry-javascript/issues
• I have reviewed the documentation https://docs.sentry.io/
• I am using the latest SDK release https://github.com/getsentry/sentry-javascript/releases

How do you use Sentry?

Sentry Saas (sentry.io)

Which SDK are you using?

@sentry/bun

SDK Version

10.34.0

Framework Version

Link to Sentry event

https://lukez-dev.sentry.io/share/issue/7baae5a7125d46ca84971f6344104cf0/

Reproduction Example/SDK Setup

Here's a minimal reproduction for the Sentry error with require-in-the-middle in an ES module context:

Project Structure

sentry-repro/
├── package.json
├── .env (optional)
├── src/
│   ├── instrument.js
│   └── index.ts
└── pm2.config.js (optional)

Files

// package.json
{
  "name": "sentry-repro",
  "version": "1.0.0",
  "type": "module",
  "scripts": {
    "dev": "bun run --preload ./src/instrument.js src/index.ts",
    "pm2": "pm2 start pm2.config.js"
  },
  "dependencies": {
    "@sentry/bun": "^10.34.0"
  },
  "devDependencies": {
    "@types/bun": "latest"
  }
}

// instrument.js
import * as Sentry from "@sentry/bun";

Sentry.init({
  dsn: "https://examplekey@o1234567.ingest.sentry.io/1234567",
  tracesSampleRate: 0.75,
});

// index.ts
import "./instrument.js";

console.log("App started successfully");

// Keep process alive
setInterval(() => {
  console.log("Still running...");
}, 5000);

// pm2.config.js (ESM syntax)
export const name = "sentry-repro";
export const script = "src/index.ts";
export const interpreter = "bun";
export const interpreter_args = "--preload ./src/instrument.js";
export const env = {
  NODE_ENV: "production",
};

Steps to Reproduce

1. Use the code above
2. Run the dev or pm2 script (I use pm2)
3. Observe

Expected Result

Should throw because it's not commonjs (require only works there)

However, sentry should work with ESM

Actual Result

Does throw because it's "type": "module"

Additional Context

I'm not quite sure if the issue is because of bun and pm2, but it is most definitely because of it being an ES module and require not working in there.

However I could trace it back the dependency tree:
@sentry/bun < @sentry/node < @opentelemetry/instrumentation < require-in-the-middle

Since it is from @opentelemetry/instrumentation, maybe I should report it there as well? Or is it because of the implementation in @sentry/node ?

Priority

_{React with 👍 to help prioritize this issue. Please use comments to provide useful context, avoiding +1 or me too, to help us triage it.}

[linear]

JS-1490

[andreiborza]

Hi @The-LukeZ, I created a reproduction repo based on your reproduction in this issue but did not run into any issues when running it: https://github.com/andreiborza/sentry-bun-esm-repro

Could you try to see what might be different and see if you can get it into a breaking state?

[karam1ashqar]

same things happens with me when i upgrade to nextjs 16.1.0