my-nvim-setup/lua/plugins/lsp.lua

return {
  {
    "williamboman/mason.nvim",
    config = function()
      require("mason").setup {
        ui = {
          icons = {
            package_installed = "✓",
            package_pending = "➜",
            package_uninstalled = "✗",
          },
          border = "rounded",
        },
      }
    end,
  },

  {
    "williamboman/mason-lspconfig.nvim",
    config = function()
      require("mason-lspconfig").setup()
      require("mason-lspconfig").setup_handlers {
        -- The first entry (without a key) will be the default handler
        -- and will be called for each installed server that doesn't have
        -- a dedicated handler.
        function(server_name) -- default handler (optional)
          require("lspconfig")[server_name].setup {}
        end,

        -- Next, you can provide a dedicated handler for specific servers.
        -- For example, a handler override for the `rust_analyzer`:
        -- ["rust_analyzer"] = function ()
        --     require("rust-tools").setup {}
        -- end
      }
    end,
  },

  {
    "neovim/nvim-lspconfig",
    config = function()
      require "plugins/lspconfig/config"()
    end,
  },

  {
    "jose-elias-alvarez/null-ls.nvim",
    dependencies = { "nvim-lua/plenary.nvim" },
    config = function()
      local null_ls = require "null-ls"
      local augroup = vim.api.nvim_create_augroup("LspFormatting", {})

      null_ls.setup {
        border = "rounded",
        cmd = { "nvim" },
        debounce = 250,
        debug = false,
        default_timeout = 5000,
        diagnostic_config = {},
        diagnostics_format = "#{m}",
        fallback_severity = vim.diagnostic.severity.ERROR,
        log_level = "warn",
        notify_format = "[null-ls] %s",
        on_init = nil,
        on_exit = nil,
        root_dir = require("null-ls.utils").root_pattern(".null-ls-root", "Makefile", ".git"),
        should_attach = nil,
        sources = nil,
        temp_dir = nil,
        update_in_insert = false,
        -- formatting on save
        on_attach = function(client, bufnr)
          if client.supports_method "textDocument/formatting" then
            vim.api.nvim_clear_autocmds { group = augroup, buffer = bufnr }
            vim.api.nvim_create_autocmd("BufWritePre", {
              group = augroup,
              buffer = bufnr,
              callback = function()
                vim.lsp.buf.format { bufnr = bufnr }
              end,
            })
          end
        end,
      }
    end,
  },

  {
    "jay-babu/mason-null-ls.nvim",
    event = { "BufReadPre", "BufNewFile" },
    dependencies = {
      "williamboman/mason.nvim",
      "jose-elias-alvarez/null-ls.nvim",
    },
    config = function()
      require("mason-null-ls").setup {
        automatic_setup = true,
        ensure_installed = { "shfmt", "prettier", "stylua" },
        handlers = {},
      }
    end,
  },
}