return {
    "nvim-treesitter/nvim-treesitter",
    branch = "main",
    build = function()
        require("nvim-treesitter").update()
    end,
    event = { "BufReadPre", "BufNewFile" },
    config = function()
        local ts = require("nvim-treesitter")
        local ensure = { "swift" }
        local installed = ts.get_installed and ts.get_installed() or {}
        local to_install = {}
        for _, lang in ipairs(ensure) do
            if not vim.tbl_contains(installed, lang) then
                table.insert(to_install, lang)
            end
        end
        if #to_install > 0 then
            ts.install(to_install)
        end

        vim.api.nvim_create_autocmd("FileType", {
            pattern = { "swift" },
            callback = function()
                pcall(vim.treesitter.start)
            end,
        })
    end,
}