Action fails on Node 24 default runner: "(0 , util_1.isNullOrUndefined) is not a function

[Sreyajit-Mondal]

Describe the bug

The action crashes with a TypeError when GitHub Actions runners default to Node 24,
which is now the standard runtime since GitHub's Node 20 deprecation rollout.

Error:
Error: (0 , util_1.isNullOrUndefined) is not a function

This happens because util.isNullOrUndefined was removed in Node 24, and the
action's bundled dependencies still call it.

To Reproduce

1. Use a GitHub Actions runner defaulting to Node 24 (current default as of mid-2026)

2. Run the action with a standard load test config:

   • name: Run Azure Load Test
     uses: azure/load-testing@v1.2.5
     with:
     loadTestConfigFile: loadtest-config.yaml
     loadTestResource:
     resourceGroup:
     waitForCompletion: true
     env:
     USRNAME: ***
     PASSWORD: ***
     TEST_ID_CONFIG:

3. Observe the crash immediately on action startup

Expected behavior

The action should run successfully on Node 24, matching the runner's default.

Workaround

Setting ACTIONS_ALLOW_USE_UNSECURE_NODE_VERSION: true in the step's env forces
the runner back to Node 20, which avoids the crash — but this is only a temporary
option since GitHub is fully removing Node 20 support later in 2026:
https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Versions tested

• v1.2.1 — fails
• v1.2.5 (latest) — fails identically

Environment

• GitHub-hosted runner (ubuntu-latest)
• Node 24 (runner default)