Fastify integration does not work in ESM mode

[mohd-akram]

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/node

SDK Version

8.2.1

Framework Version

No response

Link to Sentry event

No response

SDK Setup

// app.mjs
import * as Sentry from "@sentry/node";
import { fastify } from "fastify";
const app = fastify();
Sentry.setupFastifyErrorHandler(app);
const address = await app.listen();
console.info(`server listening on ${address}`);

// instrument.mjs
import * as Sentry from "@sentry/node";
Sentry.init({ dsn: process.env.SENTRY_DSN, debug: true });

Steps to Reproduce

1. node --import ./instrument.mjs app.mjs

Expected Result

Works

Actual Result

[Sentry] Fastify is not instrumented. This is likely because you required/imported fastify before calling `Sentry.init()`.

[hornta]

I'm also getting the same issue. I followed this page: https://docs.sentry.io/platforms/javascript/guides/fastify/.

I also double checked that I import Sentry before importing anything from fastify.

I'm running node v22.1.0 and sentry v8.2.1

[andreiborza]

Hi, thank you for filing this.

It looks like open-telemetry doesn't properly instrument the named export of fastify. As a workaround, could you change your code to use the default export and report back please?

import fastify from 'fastify'

We are looking into raising this upstream with open-telemetry in the meantime.

[mohd-akram]

It does not seem to make a difference. The full log:

Sentry Logger [log]: Initializing Sentry: process: 90697, thread: main.
Sentry Logger [log]: Integration installed: InboundFilters
Sentry Logger [log]: Integration installed: FunctionToString
Sentry Logger [log]: Integration installed: LinkedErrors
Sentry Logger [log]: Integration installed: RequestData
Sentry Logger [log]: Integration installed: Console
Sentry Logger [log]: Integration installed: Http
Sentry Logger [log]: Integration installed: NodeFetch
Sentry Logger [log]: Integration installed: OnUncaughtException
Sentry Logger [log]: Integration installed: OnUnhandledRejection
Sentry Logger [log]: Integration installed: ContextLines
Sentry Logger [log]: Integration installed: LocalVariablesAsync
Sentry Logger [log]: Integration installed: Context
Sentry Logger [debug]: @opentelemetry/api: Registered a global for diag v1.8.0.
Sentry Logger [debug]: @opentelemetry/api: Registered a global for trace v1.8.0.
Sentry Logger [debug]: @opentelemetry/api: Registered a global for context v1.8.0.
Sentry Logger [debug]: @opentelemetry/api: Registered a global for propagation v1.8.0.
Sentry Logger [debug]: @opentelemetry/instrumentation-http Applying instrumentation patch for nodejs core module on require hook { module: 'http' }
Sentry Logger [debug]: @opentelemetry/instrumentation-http Applying instrumentation patch for nodejs core module on require hook { module: 'https' }
[Sentry] Fastify is not instrumented. This is likely because you required/imported fastify before calling `Sentry.init()`.

[andreiborza]

Which node version are you running?