Zero downtime deployment Nodejs application

I have a Nodejs application that included clustering for being uptime and domain for error handling.

Now for achieving zero downtime deployment, I have an instruction but I need help to convert this instruction to Nodejs code (I need an example for it please).

This is the instruction:

1. When master starts, give it a symlink to worker code.
2. After deploying new code, update symlink
3. Send a signal to master: fork new workers!
4. Mater tells old workers to shut down, forks new workers from new code.
5. Mater process never stop running

Instruction source -> slide number 39

via kazem 2073