cmd pops up when watch mode triggers app restart #2297

On Windows when an application is started in watch mode via pm2 start app.js --watch and a watched file is changed, pm2 opens a new cmd window with empty content which is closed immediately afterwards. The application is restarted successfully, but the quick popping up of a new cmd window is irritating, especially when you are working in a text editor/IDE and you are losing the keyboard focus because of the opened cmd.
Expected behaviour

pm2 restarts the watched application without opening a new cmd window

Actual behaviour

pm2 restarts the watched application with a briefly showing new cmd window

Steps to reproduce

on Windows, start a simple application in --watch mode
change a watched file
observe that a new cmd window is opened and closed quickly in succession

Software versions used

OS : Windows 10 x64

PM2 Log output

Use the command: tail --lines 50 ~/.pm2/pm2.log
No log output

Start by tracing PM2's watch-mode restart path on Windows and identify the child-process launch entry point that causes the temporary cmd window. Reproduce with pm2 start app.js --watch, then change a watched file and observe the restart. Done means the application still restarts successfully without opening a new cmd window.