How to Debug Multiple Instances in Node.js Embedded Development

[sagasarate]

Node.js Version

v23.0.0-pre

NPM Version

10.6.0

Operating System

windows

Subsystem

Other

Description

I am using node::CommonEnvironmentSetup::Create to create multiple JS virtual machine instances, each running in a different thread. However, I'm encountering difficulties with debugging.

Node.js seems to only allow a single inspector instance. If I pass kOwnsInspector (or kDefaultFlags) for each CommonEnvironmentSetup::Create, the second CommonEnvironmentSetup::Create call throws an exception, which seems to be due to an IO thread initialization conflict.

If only the first CommonEnvironmentSetup::Create has kOwnsInspector, subsequent calls to CommonEnvironmentSetup::Create fail to create an inspector because they attempt to use the same listening port. I have not found any public API that allows modifying the listening port.

Lastly, I experimented with passing a parent_handle, but it seems that the debugger cannot reach the non-primary instances during debugging.

Is there a way to debug multiple JS virtual machine instances running in different threads?

Minimal Reproduction

No response

Output

No response

Before You Submit

• I have looked for issues that already exist before submitting this
• My issue follows the guidelines in the README file, and follows the 'How to ask a good question' guide at https://stackoverflow.com/help/how-to-ask