[BUG]: when using ESM, integrations won't be registered if the hook uses a file

[FredericEspiau]

Tracer Version(s)

5.43.0

Node.js Version(s)

22.14.0

Bug Report

Hey and thanks for the hard work,

let's take the example of express:

dd-trace-js/packages/datadog-instrumentations/src/express.js

Line 104 in fac8988

file: 'lib/middleware/query.js'

addHook({
  name: 'express',
  versions: ['4'],
  file: 'lib/middleware/query.js'
}, query => {
  // redacted
})

Here, you add a hook for the express integration that should work for all version 4.*.*. It should look for the lib/middleware/query.js file.

This hook will work if both the version matches and the file is present.

Unfortunately, there is a difference between require-in-the-middle and import-in-the-middle that will prevent this from working.

The difference will happen around here:

dd-trace-js/packages/datadog-instrumentations/src/helpers/register.js

Line 96 in fac8988

matchesFile = moduleName === fullFilename

If you use cjs, fullFilename will be express/lib/middleware/query.js and moduleName will be express/lib/middleware/query.js

If you use esm, fullFilename will be express/lib/middleware/query.js and moduleName will be express

This doesn't seem to be an issue with dd-trace-js but rather with import-in-the-middle.

I think the issue is here: https://github.com/nodejs/import-in-the-middle/blob/53a33a9b07799bff815864089a0c072d223df47b/index.js#L147

This looks like an optimisation to prevent sending unrelated files to the callbacks but it prevents lots of files to be sent to the callback, including the ones we need.

If you log the files sent to the Hook, you will notice that require-in-the-middle sends much more files than import-in-the-middle.

If you remove this line if (!baseDir.endsWith(specifiers.get(filename))) continue in import-in-the-middle it works again.

As I'm really not sure if the issue is with dd-trace-js or import-in-the-middle, I'm creating an issue both here and there.

Note: this should fix this issue as well: #5092

Related issue in import-in-the-middle: nodejs/import-in-the-middle#185

Thanks in advance.

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