Webpack, npm and DEV mode for JS codebase

[postullat]

Hi guys,

I've mentioned that you use ant and jscomp to build a JS codebase. Everything is fine when you need just build a drawio, but the problem appears when you want to add some customization to JS codebase and run it in DEV mode

So, I have 2 questions here:

1. How do you guys run JS codebase in DEV mode?
2. Why you would not migrate JS codebase to npm, webpack? Instead of ant you could use maven which would run webpack during the Java build

@timretout @fulldecent @mediaslav @jsteel