return {
  {
    "nvim-treesitter/nvim-treesitter",
    opts = function(_, opts)
      opts.ensure_installed = vim.list_extend(opts.ensure_installed or {}, { "bash" })
    end,
  },
  {
    "nvimtools/none-ls.nvim",
    opts = function(_, opts)
      local nls = require("null-ls")
      opts.sources = vim.list_extend(opts.sources or {}, {
        nls.builtins.diagnostics.shellcheck,
      })
    end,
  },
  {
    "williamboman/mason.nvim",
    opts = function(_, opts)
      opts.ensure_installed = vim.list_extend(opts.ensure_installed or {}, {
        "shellcheck",
      })
    end,
  },
}