When pm2 restarts a node process it creates flashing popups. When working with files that automatically save and use a watch this is extremely annoying.

To reproduce:

1. Create a new repo with git init
2. Add index.js file containing setInterval to keep the process runnning i.e. a line setInterval(() => console.log('test'), 1000);
3. At least one commit is needed to reproduce the problem so: git add ./index.js && git commit -m "whatever"
4. pm2 start index.js --watch
5. Make a change in index.js. The annoying popups will flash for a split of a second every time the file is updated.

Workaround: Run with pm2 start index.js --watch --no-vizion

This issue was introduced in version 4.5 where Vizion dependency was upgraded from 0.2.13 to 2.x.
Downgrading the dependency to 0.2.13 or disabling vizion with { vizion: false } process.json or when using CLI pm2 ...--no-vizion fixes the issue. I don't know what role vizion plays but it needs to be either replaced with something up to date or vizion needs to be patched/fixed

Also described here but this could've been a different issue originally #2182