fix(worker): fix node typings to pass environement variables correctly when spawning new thread

[franklevasseur]

Allright, this fixes a bug posted on the community forum here.

It's probably to unluckiest bug I've seen in my short dev career...

Basically what happened is:

• In file packages/worker/src/thread-pool.ts at line 13
• I was passing env variables as the option object: new Thread(entryPoint, { ...env })
• The correct way to do is to set the field for env: new Thread(entryPoint, { env: myEnvObject })
• However this did not build, because the worker package was referencing node typings of an old version (v11.x.x)
• This was not harmful in most cases as the options.env was simply undefined which defaults to process.env
• However when using pm2 the environment variable 'env' is defined with value "[object Object]"... (THIS IS SO UNLUCKY)

This resulted in the following error:

The "options.env" property must be of type object or one of undefined, null, or worker_threads.SHARE_ENV. Received type string ('[object Object]')

Well, its fixed now.

Until its release, please consider not using pm2.