[nodejs] Throw an error from a different thread

[Rom Grk]

Hi,

I'm writing GLib bindings with GObject-Introspection for nodejs, and I'm
having an issue with signal handlers (GObject's version of nodejs event
handlers). Basically, the signal callback will be run on a different thread
(in my understanding), and call a JS function. That part is working fine,
but I'm having issues with javascript errors thrown during this callback.
Currently, they're swallowed, and I'd like them to exit the program as an
exception would do in a top-level script.
I've tried to use a `TryCatch` to capture them, but I'm not anymore
advanced because I'd need to re-throw them anyway. I could also just print
the exception message and stack trace and exit the program from the C++
callback, but I was wondering if there was an elegant way to do this.

Thanks,

Romain
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