nvim/lua/plugins/conform.lua

return {
    "stevearc/conform.nvim",
    opts = {
        formatters_by_ft = {
            xml = { "xmlformatter" },
            json = { "prettier" },
            cfg = { "prettier" },
            lua = { "stylua" },
        },
        formatters = {
            xmlformatter = {
                command = "xmlformat",
                args = {
                    "--indent",
                    "4",
                    "-",
                },
                stdin = true,
            },
            prettier = {
                prepend_args = {
                    "--tab-width",
                    "4",
                },
            },
            stylua = {
                prepend_args = {
                    "--indent-width",
                    "4",
                },
            },
        },
    },
}