Documentation: Init a worker with env vars

[kellyselden]

I have a few env vars (RANDOM_SEED, THREADS) that I was setting in my pool init code and attempting to read in the workers. I realise now that I don't think that it is supported in node. I wonder if we could support starting the workers with some env vars set, similar to how spawn/exec allow setting env vars.

Something like:

let pool = Pool(() => spawn(new Worker('./foo', {
  env: {
    RANDOM_SEED: 'kjhsdfjk',
    THREADS: '8'
  }
})));

[andywer]

Good point, @kellyselden!

As it turns out, it should already be supported, undocumented and untyped, though 😉
new Worker() accepts a second, optional options argument. It will just be passed down into the worker_threads' Worker constructor (if you use the node.js worker_threads backend).

So the code snippet that you just posted might just work as is already, even though TypeScript and your IDE will try to convince you it doesn't.

See also: https://nodejs.org/api/worker_threads.html#worker_threads_class_worker

[kellyselden]

That's great! I didn't know that would work like that. Feel free to close this or repurpose the ticket for updated typings.