return {
  'nvimtools/none-ls.nvim', -- configure formatters & linters
  lazy = true,
  event = { 'BufReadPre', 'BufNewFile' }, -- to enable uncomment this
  dependencies = {
    'jay-babu/mason-null-ls.nvim',
  },
  config = function()
    local mason_null_ls = require 'mason-null-ls'

    local null_ls = require 'null-ls'

    local null_ls_utils = require 'null-ls.utils'

    mason_null_ls.setup {
      ensure_installed = {
        'prettier', -- prettier formatter
        'stylua', -- lua formatter
        'eslint-lsp', -- js linter
        'golangci-lint',
        'gofumpt',
        'goimports',
        'goimports-reviser',
        'golines',
        'gomodifytags',
        'jsonls',
      },
    }

    -- for conciseness
    local formatting = null_ls.builtins.formatting -- to setup formatters
    local diagnostics = null_ls.builtins.diagnostics -- to setup linters

    -- to setup format on save
    local augroup = vim.api.nvim_create_augroup('LspFormatting', {})

    -- configure null_ls
    null_ls.setup {
      -- add package.json as identifier for root (for typescript monorepos)
      root_dir = null_ls_utils.root_pattern('.null-ls-root', 'Makefile', '.git', 'package.json'),
      -- setup formatters & linters
      sources = {
        --  to disable file types use
        --  "formatting.prettier.with({disabled_filetypes: {}})" (see null-ls docs)
        formatting.prettier.with {
          extra_filetypes = { 'svelte' },
        }, -- js/ts formatter
        formatting.stylua, -- lua formatter
        formatting.isort,
        diagnostics.golangci_lint,
        formatting.gofumpt,
        formatting.goimports,
        formatting.goimports_reviser,
        formatting.golines,
        null_ls.builtins.code_actions.gomodifytags
      },
      -- configure format on save
      on_attach = function(current_client, bufnr)
        if current_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 {
                filter = function(client)
                  --  only use null-ls for formatting instead of lsp server
                  return client.name == 'null-ls'
                end,
                bufnr = bufnr,
              }
            end,
          })
        end
      end,
    }
  end,
}