How to build webpack.config correctly?

Question

webpack

Good evening everyone! Guys, help me deal with webpack.config For a long time I've been trying to build it normally and it just doesn't work! Something will break. And the current file is generally poor. Even webpack-dev-server doesn't work! Ideally, I need a file that would contain the following:
I will immediately make a reservation that I can be wrong with the names of the modules. I convey the meaning
- less
- less, css loaders
- sourcemap
- a module that puts in a separate css file, js code from the general js
- webpack-dev-server of course
- babel
- which allows you to make css cross-browser. Perhaps this is an auto-prefix
- And something at your discretion, what else can you advise