Sentry import failing on AWS λ for v7 & v8.7.0

[SidPrak7]

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/aws-serverless

SDK Version

8.7.0

Framework Version

@sentry/aws-serverless

Link to Sentry event

No response

SDK Setup

import * as Sentry from '@sentry/aws-serverless';
        
Sentry.init({
  dsn: "SENTRY_DSN_HERE",

  // Add Performance Monitoring by setting tracesSampleRate and adding integration
  // Set tracesSampleRate to 1.0 to capture 100% of transactions
  // We recommend adjusting this value in production
  tracesSampleRate: 1.0,
});

Steps to Reproduce

We tried the full combination set of these steps.

1. Set up the λ layers
   We tried these two ARNs

• arn:aws:lambda:us-west-2:943013980633:layer:SentryNodeServerlessSDK:247
• arn:aws:lambda:us-west-2:943013980633:layer:SentryNodeServerlessSDKv7:1

We also manually built a layer and pushed it to the λ

2. Set the env variables
   We tried these env vars
   SENTRY_DSN='SENTRY_DSN'
SENTRY_TRACES_SAMPLE_RATE=1

These four variations of NODE_OPTIONS:
NODE_OPTIONS='-r @sentry/serverless/dist/awslambda-auto'
NODE_OPTIONS='-r @sentry/serverless/awslambda-auto'
NODE_OPTIONS='-r @sentry/aws-serverless/build/npm/cjs/awslambda-auto'
not setting NODE_OPTIONS

It might be relevant that our file is .mjs file.

We are only noting the relevant errors in the Actual Result section.

Expected Result

Sentry logs something.

Actual Result

For the v7 arn & node options with dist in it:

Cannot find package '@sentry/aws-serverless' imported from /var/task/index.mjs

For the v7 arn & node options without dist in it:

Error: Cannot find module '@sentry/serverless/awslambda-auto'

For the arn we got from the docs & node options with dist in it:

Error: Cannot find module '@sentry/serverless/dist/awslambda-auto'

For the arn we got from the docs & node options without dist in it:

Error: Cannot find module '@sentry/serverless/awslambda-auto'

For the arn we got from the docs & node options with cjs in it:

Error [ERR_PACKAGE_PATH_NOT_EXPORTED]: Package subpath './build/npm/cjs/awslambda-auto' is not defined by "exports" in /opt/nodejs/node_modules/@sentry/aws-serverless/package.json

Also, since the official docs for loading the layer didn't specify setting NODE_OPTIONS, we also tried that:

Cannot find package '@sentry/aws-serverless' imported from /var/task/index.mjs\nDid you mean to import \"@sentry/aws-serverless/build/npm/cjs/index.js\"

[Lms24]

Hi @SidPrak7 thanks for writing in!

Our layer auto init script is currently only exported for CJS which is why you're running into these errors with your function which is running in ESM. I'm gonna take a look at adding an ESM entry point for this. Can't promise that this will work easily because ESM is a mess but I'll leave an update or PR later.

[sajaghori]

try:
import Sentry from '@sentry/aws-serverless';

[Lms24]

So, I looked into emitting an ESM version of the lambda layer a bit today and as expected it wasn't as straight forward as I hoped 🥲

Some challenges we overcame or still need to figure out:

•  building bundled Serverless SDK in ESM
• building awslambda-auto.js in ESM
• our check for ESM or CJS mode is broken in the bundled SDK code, causing the SDK, as well as some Otel parts to incorrectly assume CJS mode instead of ESM. This is because our rollup config (some plugin probably), for some reason replaces global require references with a minified version of require that just throws an error 🤦 We can fix this. Found an ugly way so far but there's probably a nicer solution.
• Otel Instrumentation does not seem to get applied despite us coming in early enough with the --import arg set in NODE_OPTIONS. I'm not sure yet what the cause is. So far, my two suspicions are:
  • Our own imports of e.g. http that are evaluated before the init call is made
  • Import-in-the-middle is failing silently, resulting in http et al. not being patched

I'll work on this a bit more tomorrow. For now, to unblock you, I can't give you a better workaround yet than to run your lambdas in CJS ("require") mode. If you're building/transpiling your functions (e.g. typescript) this shouldn't be too hard; otherwise rewriting everything to require instead of import is obviously not ideal. I'll keep you posted on updates.

EDIT: Actually, one thing I haven't tried so far is to directly import and use the @sentry/aws-serverless package in your functions, as shown here, without using our layer at all. This should work and I know it does fine in CJS. However, I haven't tested this yet in ESM.