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I believe that day has already come: https://nodejs.org/docs/latest-v20.x/api/worker_threads.html...
When you create a Worker with the worker_threads module, Node spawns a new V8 isolate in the same process: https://github.com/nodejs/node/blob/v20.12.1/src/node_worker...
It’s much more isolation than C threads – the entry point for a thread is a whole module (not a function), and threads must use message passing to communicate. They can share memory, but only via [Shared]ArrayBuffer objects.
But I think it'd meet your needs for an in-process isolated execution environment, which you can terminate from the main thread after a timeout.