return {
	'williamboman/mason-lspconfig.nvim',
	config = function()
		local cmp_nvim_lsp = require 'cmp_nvim_lsp'
		local capabilities = cmp_nvim_lsp.default_capabilities()
		local lspconfig = require 'lspconfig'
		local function on_attach(client, bufnr)
			--[[ vim.api.nvim_buf_set_option(bufnr, 'omnifunc', 'v:lua.vim.lsp.omnifunc') ]]
			if client.name == 'jdtls' or client.name == 'jdt.ls' then
				client.server_capabilities.documentFormattingProvider = false
				vim.lsp.codelens.refresh()
				if JAVA_DAP_ACTIVE then
					require('jdtls').setup_dap { hotcodereplace = 'auto' }
					require('jdtls.setup').add_commands()
					require('jdtls.dap').setup_dap_main_class_configs()
				end
			end
			-- -- util.info(client.name .. " " .. (enable and "yes" or "no"), "format")
			client.server_capabilities.documentFormattingProvider = true
			-- client.server_capabilities.documentFormattingProvider = true
			client.server_capabilities.semanticTokensProvider = nil
		end

		require('mason-lspconfig').setup_handlers {
			function(server_name) -- default handler (optional)
				lspconfig[server_name].setup {
					on_attach = on_attach,
					capabilities = capabilities,
				}
			end,
			['clangd'] = function()
				local clangd_flags = {
					'-j=5',
					'--all-scopes-completion',
					'--suggest-missing-includes',
					'--background-index',
					'--pch-storage=disk',
					'--cross-file-rename',
					'--log=info',
					'--completion-style=detailed',
					'--enable-config', -- clangd 11+ supports reading from .clangd configuration file
					'--clang-tidy',
					-- "--clang-tidy-checks=-*,llvm-*,clang-analyzer-*,modernize-*,-modernize-use-trailing-return-type",
					-- "--fallback-style=Google",
					-- "--header-insertion=never",
					-- "--query-driver=<list-of-white-listed-complers>"
				}
				lspconfig.clangd.setup {
					on_attach = on_attach,
					capabilities = capabilities,
					arg = {
						unpack(clangd_flags)
					}
				}
			end,
			['lua_ls'] = function()
				lspconfig.lua_ls.setup {
					on_attach = on_attach,
					capabilities = capabilities,
					flags = {
						debounce_text_changes = 150,
					},
					settings = {
						Lua = {
							diagnostics = {
								globals = { 'vim' },
							},
							-- workspace = {
							-- 	library = {
							-- 		[vim.fn.expand '$VIMRUNTIME/lua'] = true,
							-- 		[vim.fn.stdpath 'config' .. '/lua'] = true,
							-- 	},
							-- },
							telemetry = {
								enable = false,
							},
						},
					},
				}
			end,
			['jdtls'] = function()
			end,
			['rust_analyzer'] = function()
				require('rust-tools').setup {
					server = {
						on_attach = on_attach,
						standalone = false,
					},
				}
			end,
		}
	end
}
-- if server == 'elixirls' then
-- 	local elixir_opts = {
-- 		cmd = { "/home/user/.local/share/nvim/mason/packages/elixir-ls/language_server.sh" },
-- 	}
-- 	opts = vim.tbl_deep_extend('force', elixir_opts, opts)
-- end