New nvim user needs help with null-ls

[aidanmatchette]

Hey, I am new to nvim, loving the customization abilities so far. I am trying to set up a good null-ls config for primarily react.js and python development. I have failed miserably. I would like to use black and prettierd as formatters and am open to suggestions on what to use as a linter. Any help on creating a working null-ls setup and where to put it in my config files would be greatly appreciated.

[jose-elias-alvarez]

Take a look at this guide to learn about configuring Neovim using init.lua, which will simplify configuration. You can then install null-ls via any package manager (packer.nvim is a safe choice) and set it up in your config using the information found in the documentation here. Most built-in sources will work out of the box, so you can see which ones we have available here and add them to your config.

I can't really provide any advice on choosing linters, since in most cases the answer is "whatever your projects are already using". I imagine most React projects are using ESLint, which we have available as a source for diagnostics, formatting, and code actions, but beyond that I can't really say.

[HarshilPatel007]

hi @aidanmatchette , you can look at the my config for python. you don't need to relay on null-ls for black. neovim it self provides the way of formatting with black(see my keymaps). I've combined isort and black to one keybinding. https://github.com/HarshilPatel007/learn-vim/tree/neovim.
although, I've not able to pass the params to black through Black command which we can in null-ls. I'll change it in future.
But, for now my config does well for python.

• theme and keybinding is identical to vscode/vscodium
• pyright as a lsp
• cmp as a completion
• black as a code formatting
• pylint and flake8 as a linting
• what else we need?

[aidanmatchette]

hey @HarshilPatel007 thanks for the response and some help. I should be more specific I feel. I am using AstroNvim. I added my nvim config files. https://github.com/aidanmatchette/nvim . When I try to use lf to run the formatter nothing happens. Any suggestions?

[HarshilPatel007]

Hi @aidanmatchette,
you have to use :Format command. see in your config this is based on LSP. since, nvim pyright doesn't support formatting. you've to use either null-ls formatting way or my way of formatting. see here.
but for that, you've to install isort and black system wide. ex: pip --user install black

[HarshilPatel007]

you can copy my pyright settings to work flawlessly. https://github.com/HarshilPatel007/learn-vim/blob/neovim/nvim/lua/user/lspconf/pyright.lua
JUST BACKUP YOUR nvim config and TRY MY config for python. you've to just add and config it for web dev as per your need.