Debugging javascript inside cypress plugins

[ebychkov-sugarcrm]

Hi guys
I am evaluating cypress for my project currently
I can't make VSCode to stop inside plugins/index.js file. I have certain webpack configuration inside my project which I may have to share with cypress webpack to make unit-testing possible
Overall i feel that may need to debug cypress plugins end events in future
But I can't make VSCode to trigger a breakpoint
I always get this 'unbound breakpoint'

My VSCode run configuration

I've tried both node 12 and node 14
I've tried running cypress as

1. require('cypress').open()
2. npx cypress open

I verified that plugins/index.js is processed by cypress indeed by simply doing console.log() inside it

Am I missing something?