API resolved without sending a response with intermediate logger using `req.log.with`

[nikosantis]

I am using Next.js 13.3.0 along with version 0.17.0 of the next-axiom library to handle API routing in my application. I have created an intermediate logger using req.log.with to customize the logs in my API endpoint handlers. However, I am experiencing an issue where responses are not sent correctly and warnings are generated in the console.

The issue seems to be related to the use of req.log.with, as when I use it, responses are not sent correctly and requests are left hanging, resulting in the following warning in the console:

"API resolved without sending a response for /api/[endpoint], this may result in stalled requests."

This issue only occurs when I use req.log.with, as if I only use req.log.info for logging, no warnings are generated and responses are sent correctly.

I have found a workaround by adding the following config object to my API route:

export const config = {
  api: {
    externalResolver: true,
  },
}

This seems to resolve the issue, but I'm not sure if it's the proper implementation or not, as there is no information available in the documentation of next-axiom.

Here are the versions I am using:

Next.js: 13.3.0
next-axiom: 0.17.0
Steps to reproduce the issue:

Create an intermediate logger using req.log.with in an API endpoint handler in Next.js.
Make a request to that endpoint from a client.
Observe that the response is not sent correctly and warnings are generated in the console.

eg:

import type { NextApiResponse } from 'next'
import { AxiomAPIRequest, withAxiom } from 'next-axiom'

async function handler(req: AxiomAPIRequest, res: NextApiResponse) {
  const logger = req.log.with({
    timestamp: new Date(Date.now()).toISOString(),
    env: process.env.NODE_ENV,
    node_version: process.version,
  })
  logger.info('test', {
    data: { url: req.url, method: req.method },
  })
  res.status(200).json({ message: 'Message sent' })
}

export default withAxiom(handler)

I was trying to create a function createLogger:

eg:

import { Logger } from 'next-axiom'
import pckJson from 'package.json'

function createLogger(logger: Logger) {
  const log = logger.with({
    timestamp: new Date(Date.now()).toISOString(),
    env: process.env.NODE_ENV,
    node_version: process.version,
    project_version: pckJson.version,
    next_version: pckJson.dependencies.next,
  })
  return log
}

export { createLogger }

[bahlo]

Hey @nikosantis, sorry for getting back so late -- from a quick look I'm surprised that with would introduce these problems, I'll try to reproduce using your code, thanks for bringing this issue to our attention 🙏