registered load hook fails to print consecutive console.log

[iambumblehead]

Version

v20.15.1

Platform

Linux lenovo-21bx 6.11.0 #1-lenovo-21bx SMP PREEMPT Thu Sep 26 11:38:13 UTC 2024 aarch64 Linux

Subsystem

No response

What steps will reproduce the bug?

run the attached file with: touch file.js && node mytest.js, observe console.log('1', { loadurl: url }) is printed to process output, but consecutive calls including console.log('2', { loadurl: url }) are never seen.

mytest.js

import { register } from 'node:module';
import assert from 'node:assert';

async function resolve(referrer, context, next) {
 const result = await next(referrer);
 const url = new URL(result.url)

 console.log({
   url: result.url,
   parentURL: context.parentURL,
   result
 })

 return result
}

async function load(url, context, next) {
 console.log('1', { loadurl: url })
 console.log('2', { loadurl: url })
 console.log('3', { loadurl: url })
 console.log('4', { loadurl: url })

 if (url.endsWith('file.js')) {
   return {
     shortCircuit: true,
     format: 'commonjs',
     responseURL: url,
     source: `
       const fs = require('fs')

       module.exports = (path) => {
         //fs.readFileSync(path, 'utf8')
       }`
    }
 }

 return next(url, context);
}

register(`data:text/javascript,export ${encodeURIComponent(resolve)};export ${encodeURIComponent(load)}`);

const testread = (await import('./file.js')).default
console.log(testread('testpath'));

How often does it reproduce? Is there a required condition?

every time

What is the expected behavior? Why is that the expected behavior?

each console.log call should be printed to the console, otherwise the behaviour is unpredictable

What do you see instead?

only one console.log call is seen

Additional information

No response

[avivkeller]

This is expected behavior. console.log does not have time to complete, as it's not a synchnorous function. Use fs when logging from hooks.