It's a code editor. It's not that much more complex than vim. It doesn't do magic to your codebase that makes development different. I've written plugins for vim, neovim and VSCode... VSCode at least has well documented interfaces for everything (edit: well ok not everything, there are some difficult gaps in the docs), and it's pretty clear how things work under the hood. Neovim is fine too, lua is nice. Vim plugins I didn't enjoy much.