return {
  {
    "nvim-treesitter/nvim-treesitter",
    opts = function(_, opts)
      if type(opts.ensure_installed) == "table" then
        vim.list_extend(opts.ensure_installed, { "dockerfile" })
      end
    end,
  },
  {
    "jose-elias-alvarez/null-ls.nvim",
    opts = function(_, opts)
      local nls = require("null-ls")
      opts.sources = opts.sources or {}
      vim.list_extend(opts.sources, {
        nls.builtins.diagnostics.hadolint,
      })
    end,
    dependencies = {
      "mason.nvim",
      opts = function(_, opts)
        opts.ensure_installed = opts.ensure_installed or {}
        vim.list_extend(opts.ensure_installed, { "hadolint" })
      end,
    },
  },
  {
    "neovim/nvim-lspconfig",
    opts = {
      servers = {
        dockerls = {},
        docker_compose_language_service = {},
      },
    },
  },
}