I need the following folder structure:

public
  index.html
  build
    main.js
    other.js

I have created simple demo, here is a link to github, so you can check the configs: https://github.com/ArtemDomochka/dev-server

Problem: dev-server doesn't work

Details: If I will build the project with npm run build everything is good. But whenever I start dev-server with npm run start it doesn't work. May be dev-server changes file structure, but in browser I just get error: Cannot GET /, so it can't even find index.html

Is it possible to fix it?

There is also an interesting observation: If I will build project and then serve it, page will be loaded correctly, but it will not handle code changes in real time