return {
  {
    "nvim-treesitter/nvim-treesitter",
    opts = function(_, opts)
      if type(opts.ensure_installed) == "table" then
        vim.list_extend(opts.ensure_installed, { "css", "scss" })
      end
    end,
  },
  {
    "neovim/nvim-lspconfig",
    opts = {
      servers = {
        cssmodules_ls = {},
        cssls = {
          lint = {
            compatibleVendorPrefixes = "ignore",
            vendorPrefix = "ignore",
            unknownVendorSpecificProperties = "ignore",

            -- unknownProperties = "ignore", -- duplicate with stylelint

            duplicateProperties = "warning",
            emptyRules = "warning",
            importStatement = "warning",
            zeroUnits = "warning",
            fontFaceProperties = "warning",
            hexColorLength = "warning",
            argumentsInColorFunction = "warning",
            unknownAtRules = "warning",
            ieHack = "warning",
            propertyIgnoredDueToDisplay = "warning",
          },
        },
      },
    },
  },
  {
    "williamboman/mason.nvim",
    opts = function(_, opts)
      opts.ensure_installed = opts.ensure_installed or {}
      vim.list_extend(opts.ensure_installed, { "cssmodules-language-server", "css-lsp" })
    end,
  },
}