tests: module-hooks load hook returning null causes ERR_INVALID_RETURN_PROPERTY_VALUE

[THE-Amrit-mahto-05]

Version

v24.5.0

Platform

Darwin MacBook-Pro-M1.local 24.6.0 Darwin Kernel Version 24.6.0: Mon Jul 14 11:30:29 PDT 2025; root:xnu-11417.140.69~1/RELEASE_ARM64_T6000 arm64

Subsystem

test / module-hooks

What steps will reproduce the bug?

1. Navigate to the test directory:
   cd node/test/module-hooks

2. Run the test:
   node test-module-hooks-load-async-and-sync.js

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

Always

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

The test should complete successfully with exit code 0.

What do you see instead?

TypeError [ERR_INVALID_RETURN_PROPERTY_VALUE]: Expected a string, an ArrayBuffer, or a TypedArray to be returned for the "source" from the "load" hook but got null.

Additional information

Root cause:

• In fixtures/module-hooks/sync-and-async/async-forward-loader.js and sync-forward.js,
  the load hooks directly return nextLoad(url, context), which can return null.

• This causes ERR_INVALID_RETURN_PROPERTY_VALUE when the loader chain doesn't provide a result.

Proposed fix:
Add a fallback when nextLoad returns null:
{
format: 'esm',
source: 'console.log("Hello world");'
}

After adding this fallback, the test runs successfully:
node test-module-hooks-load-async-and-sync.js
echo $?

Output: 0

[aduh95]

The test passes, making it pass with Node.js v24.5.0 is not a goal