return {
    "neovim/nvim-lspconfig",
    dependencies = {
        "stevearc/conform.nvim",
        "williamboman/mason.nvim",
        "williamboman/mason-lspconfig.nvim",
        "hrsh7th/cmp-nvim-lsp",
        "hrsh7th/cmp-buffer",
        "hrsh7th/cmp-path",
        "hrsh7th/cmp-cmdline",
        "hrsh7th/nvim-cmp",
        -- snippets, using luasnip for now
        "L3MON4D3/LuaSnip",
        "saadparwaiz1/cmp_luasnip",
    },

    config = function()
        require("conform").setup({ formatters_by_ft = {} })
        local cmp = require('cmp')
        local cmp_lsp = require("cmp_nvim_lsp")
        local capabilities = vim.tbl_deep_extend(
            "force",
            {},
            vim.lsp.protocol.make_client_capabilities(),
            cmp_lsp.default_capabilities()
        )

        require("mason").setup()
        require("mason-lspconfig").setup({
            ensure_installed = {
                "clangd",
                "lua_ls",
                "ruby_lsp",
                -- "gopls",
                -- "tailwindcss",
            },
            handlers = {
                function(server_name) -- default
                    require("lspconfig")[server_name].setup {
                        capabilities = capabilities
                    }
                end,

                ["lua_ls"] = function()
                    local lspconfig = require("lspconfig")
                    lspconfig.lua_ls.setup {
                        capabilities = capabilities,
                        settings = {
                            Lua = {
                                format = {
                                    enable = true,
                                    defaultConfig = { -- NOTE: string values only
                                        indent_style = "space",
                                        indent_size = "2",
                                    },
                                },
                            },
                        },
                    }
                end,
            }
        })

        local cmp_select = { behavior = cmp.SelectBehavior.Select }
        cmp.setup({
            mapping = cmp.mapping.preset.insert({
                ["<C-Space>"] = cmp.mapping.complete(),
                ['<C-y>'] = cmp.mapping.confirm({ select = true }),
                ['<C-n>'] = cmp.mapping.select_next_item(cmp_select),
                ['<C-p>'] = cmp.mapping.select_prev_item(cmp_select),
                ['<C-d>'] = cmp.mapping.scroll_docs(-4),
                ['<C-u>'] = cmp.mapping.scroll_docs(4),
            }),
            snippet = {
                expand = function(args)
                    -- vim.snippet.expand(args.body) -- TODO: native option, maybe try
                    require('luasnip').lsp_expand(args.body)
                end,
            },
            sources = cmp.config.sources({
                { name = 'nvim_lsp' },
                { name = 'luasnip' },
            }, {
                { name = 'buffer' },
            }),
            window = {
                completion = cmp.config.window.bordered(),
                documentation = cmp.config.window.bordered(),
            },
            performance = {
                max_view_entries = 14,
            },
        })

        -- `/` cmdline setup.
        cmp.setup.cmdline(':', {
            mapping = cmp.mapping.preset.cmdline(),
            sources = cmp.config.sources({
                { name = 'path' }
            }, {
                { name = 'cmdline' }
            }),
            matching = { disallow_symbol_nonprefix_matching = false }
        })

        vim.diagnostic.config({
            -- update_in_insert = true,
            float = {
                focusable = false,
                style = "minimal",
                border = "rounded",
                source = "always",
                header = "",
                prefix = "",
            },
        })

        -- TODO: enables needed? or does neovim/nvim-lspconfig cover by default?
        -- vim.lsp.enable('clangd')
        -- vim.lsp.enable('ruby_lsp')
        -- vim.lsp.enable('standardrb')
        -- vim.lsp.enable('herb_ls') -- targets html + ruby (erb files)
    end,
}