return {
    "nvimtools/none-ls.nvim",
    config = function()
        local null_ls = require("null-ls")
        null_ls.setup({
            sources = {
                -- Formatters.
                null_ls.builtins.formatting.stylua, -- Lua
                -- C, C#, C++, JSON, Java, JavaScript
                --null_ls.builtins.formatting.clang_format,
                --null_ls.builtins.formatting.csharpier,      -- C#
                null_ls.builtins.formatting.black,          -- Python
                null_ls.builtins.formatting.isort,          -- Python
                null_ls.builtins.formatting.htmlbeautifier, -- HTML
                -- null_ls.builtins.formatting.gersemi,        -- CMake.
                -- Linters.
                -- C, C++, Rust, Go, Java, Python, C#, JavaScript, JSX, TypeScript, HTML, CSS, Kotlin, Dart, Lua
                --null_ls.builtins.diagnostics.ast_grep, --old code
            },
        })

        --Keymaps.
        vim.keymap.set("n", "<leader>gf", vim.lsp.buf.format, {})
    end,
}