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How to make this work in powershell? #366
Description
I tried to create a PowerShell module to run JS in PowerShell.
However, in reality, not only can I not call it normally after loading the module, but I also cannot use Node.js normally.
Before loading the module, Node.js runs well in my shell:
Loading the module and trying to run a simple script results in an error:
Subsequently, both the Node.js command and the JS code running function of the esh cannot be used normally:
Activity
jasongin commentedon Sep 3, 2024
I've never tried using it in PowerShell before. I don't quite understand what's going wrong here, but I will try to investigate.
jasongin commentedon Sep 16, 2024
I looked into this a little bit. Here is the inner exception message for the "exception thrown from JS thread":
I made a small PR that will make that inner exception message easier to see for situations like this: #378
Now the actual problem is that PowerShell expects to run scripts on a certain thread (with an associated "runspace") but JavaScript also must run on a particular thread. The
Actiondelegate passed to theRunmethod gets invoked on the JS thread, but since that delegate is actually a PS script it cannot be executed on that thread.Currently the
NodejsEnvironmentclass always creates a dedicated thread for each JS environment, so that doesn't allow PS and JS scripts to run on the same thread. However Vladimir Morozov (@vmoroz) is working on some changes to thelibnodeembedding API that will give us more flexibility to execute JS on a specific (existing) thread, which I think can work better for interaction with PowerShell.Another workaround could be to add a
NodejsEnvironment.RunScript()and/orRunScriptAsync()method which would run the given script on the JS thread without needing a callback.