kickstart.nvim/lua/custom/plugins/none-ls.lua

return {
  'nvimtools/none-ls.nvim',
  config = function()
    local null_ls = require 'null-ls'

    null_ls.setup {
      sources = {
        null_ls.builtins.formatting.black,
        null_ls.builtins.diagnostics.mypy,
        null_ls.builtins.formatting.ruff,
      },
    }
  end,
}