nvim-dap VS nvim-gdb

There are DAP extensions for both Vim (e.g. https://github.com/puremourning/vimspector) and NeoVim (https://github.com/mfussenegger/nvim-dap). I can't speak as to the experience in detail (I think I briefly played with nvim-dap a year or two ago), but I suspect that for most it will be good enough.

https://github.com/mfussenegger/nvim-dap/issues/1062 https://github.com/mfussenegger/nvim-dap/issues/737

Also, you can set up debugger integration with https://github.com/mfussenegger/nvim-dap .

You could use nvim-dap with nvim-dap-python.

I'd suggest starting with a Neovim distro that makes things work for you and as you get familiar you can transition to a more custom configuration as you see fit. If you want to do it by yourself then the most popular plugin for debugging in Neovim is nvim-dap and there is also an extension for Python to give you a more ready to go config instead of doing it yourself. You should read the docs of those 2 to see how you should customize accordingly your configuration.

(neovim only) nvim-dap

https://github.com/mfussenegger/nvim-dap + https://github.com/theHamsta/nvim-dap-virtual-text should be able to do it, I think?

If you want to debug types in TypeScript, you could use marilari88/twoslash-queries.nvim. If you would like to debug TypeScript/JavaScript code, then you need mfussenegger/nvim-dap, you could read this article: Debugging using DAP to understand how to set up it.

It's not ideal to me yet. I've had some problems with DAP. The DAP servers I've checked were a bit unstable and slow. For now I'm using gdb with nvim-gdb https://github.com/sakhnik/nvim-gdb

Very reliable and as fast as gdb is. But with all the problems just using gdb has.

Maybe https://github.com/sakhnik/nvim-gdb (bashdb uses gdb like commands) I've mostly used llvm debugger and node debugger so I am not too familiar with gdb.

nvim-gdb: GDB wrapper, simple and easy to hack.

Recently I am using nvim-gdb, which is inspired by neovim-gdb.vim script. I am wondering whether it is possible to have the same visual interface in terms of current line running as well as the breakpoint mark similar to the above two project but not connect to the debug?

There's the plugin that evolved from the original neovim debugger: sakhnik/nvim-gdb. Well tested and maintained. Spoiler: personal affiliation.

sakhnik/nvim-gdb This one also looks like a nice debugger plugin; also neovim only.

https://www.dannyadam.com/blog/2019/05/debugging-in-vim/ describes it well. https://github.com/sakhnik/nvim-gdb is nicer, but requires neovim.