return {
  "mfussenegger/nvim-lint",
  enabled = pcode.disable_null_ls or false,
  event = { "BufReadPre", "BufNewFile" },
  opts = function(_, opts)
    local mason_reg = require("mason-registry")

    opts.linters_by_ft = opts.linters_by_ft or {}

    -- add diff langue vs filetype
    local keymap = {
      ["c++"] = "cpp",
      ["c#"] = "cs",
    }

    -- add dif conform vs mason
    local name_map = {
      ["actionlint"] = "actionlint",
      ["ansible_lint"] = "ansible_lint",
      ["buf"] = "buf_lint",
      ["buildifier"] = "buildifier",
      ["cfn-lint"] = "cfn_lint",
      ["checkstyle"] = "checkstyle",
      ["clj-kondo"] = "clj_kondo",
      ["cmakelint"] = "cmakelint",
      ["codespell"] = "codespell",
      ["cpplint"] = "cpplint",
      ["cspell"] = "cspell",
      ["curlylint"] = "curlylint",
      ["djlint"] = "djlint",
      ["erb-lint"] = "erb_lint",
      ["eslint_d"] = "eslint_d",
      ["flake8"] = "flake8",
      ["gdtoolkit"] = "gdlint",
      ["golangci-lint"] = "golangcilint",
      ["hadolint"] = "hadolint",
      ["jsonlint"] = "jsonlint",
      ["ktlint"] = "ktlint",
      ["luacheck"] = "luacheck",
      ["markdownlint"] = "markdownlint",
      ["mypy"] = "mypy",
      ["phpcs"] = "phpcs",
      ["phpmd"] = "phpmd",
      ["phpstan"] = "phpstan",
      ["proselint"] = "proselint",
      ["pydocstyle"] = "pydocstyle",
      ["pylint"] = "pylint",
      ["revive"] = "revive",
      ["rstcheck"] = "rstcheck",
      ["rubocop"] = "rubocop",
      ["ruff"] = "ruff",
      ["selene"] = "selene",
      ["shellcheck"] = "shellcheck",
      ["sqlfluff"] = "sqlfluff",
      ["standardrb"] = "standardrb",
      ["stylelint"] = "stylelint",
      ["solhint"] = "solhint",
      ["tflint"] = "tflint",
      ["tfsec"] = "tfsec",
      ["trivy"] = "trivy",
      ["vale"] = "vale",
      ["vint"] = "vint",
      ["vulture"] = "vulture",
      ["yamllint"] = "yamllint",
    }

    for _, pkg in pairs(mason_reg.get_installed_packages()) do
      for _, type in pairs(pkg.spec.categories) do
        -- only act upon a formatter
        if type == "Linter" then
          -- finally add the formatter to it's compatible filetype(s)
          for _, ft in pairs(pkg.spec.languages) do
            local ftl = string.lower(ft)
            local ready = mason_reg.get_package(pkg.spec.name):is_installed()
            if ready then
              if keymap[ftl] ~= nil then
                ftl = keymap[ftl]
              end
              if name_map[pkg.spec.name] ~= nil then
                pkg.spec.name = name_map[pkg.spec.name]
              end
              opts.linters_by_ft[ftl] = opts.linters_by_ft[ftl] or {}
              table.insert(opts.linters_by_ft[ftl], pkg.spec.name)
            end
          end
        end
      end
    end
  end,
  config = function(_, opts)
    require("lint").linters_by_ft = opts.linters_by_ft
  end,
}