The simplest loader results in an infinite loop of module loading

[giltayar]

Version

v20.0.0

Platform

Linux Dell-GilTayar 5.15.90.1-microsoft-standard-WSL2 #1 SMP Fri Jan 27 02:56:13 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux

Subsystem

modules

What steps will reproduce the bug?

// loader.mjs
console.log('loader loading...')

export const resolve = (a, b, nextResolve) => nextResolve(a, b)
export const load = (a, b, nextLoad) => nextLoad(a, b)

// index.mjs
setTimeout(() => {}, 1000000)

You can find the above code here: https://github.com/giltayar/global-preload-called-twice

Now run node --no-warnings --loader=./loader.mjs index.mjs

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

Every time it runs.

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

See Loader loading... once

What do you see instead?

An infinite loop of loader loading... console lines until the program ends.

Additional information

I found it out while coding quibble (a module mock library) to support off worker threads. A simple loader, while being infinitely loaded, will still work: probably the first module loaded is used, but the module loading will continue while the program is running. quibble failed to work because it uses globalPreload and that was being called again and again and again...

[giltayar]

Just saw this: #47566. Probably the same bug.

[aduh95]

Closing as duplicate of #47566