return {
	-- tools
	{
		"williamboman/mason.nvim",
		opts = function(_, opts)
			vim.list_extend(opts.ensure_installed, {
				"stylua",
				"selene",
				"luacheck",
				"shellcheck",
				"shfmt",
				"tailwindcss-language-server",
				"typescript-language-server",
				"css-lsp",
			})
		end,
	},
	{
		"ray-x/lsp_signature.nvim",
		opts = {},
		config = function(_, opts) require'lsp_signature'.setup(opts) end
	},
	{
		'nvimdev/lspsaga.nvim',
		config = function()
			require('lspsaga').setup({})
		end,
		dependencies = {
			'nvim-treesitter/nvim-treesitter',
			'nvim-tree/nvim-web-devicons'     -- optional
		}
	},
	-- lsp servers
	{
		"neovim/nvim-lspconfig",
		opts = {
			inlay_hints = { enabled = false },
			---@type lspconfig.options
			servers = {
				cssls = {},
				tailwindcss = {
					root_dir = function(...)
						return require("lspconfig.util").root_pattern('tailwind.config.js', 'tailwind.config.cjs', 'tailwind.config.mjs', 'tailwind.config.ts', 'postcss.config.js', 'postcss.config.cjs', 'postcss.config.mjs', 'postcss.config.ts', 'package.json', 'node_modules', '.git')(...)
					end,
				},
				tsserver = {
					root_dir = function(...)
						return require("lspconfig.util").root_pattern("tsconfig.json", "package.json", "jsconfig.json", ".git")(...)
					end,
					single_file_support = false,
					settings = {
						typescript = {
							inlayHints = {
								includeInlayParameterNameHints = "literal",
								includeInlayParameterNameHintsWhenArgumentMatchesName = false,
								includeInlayFunctionParameterTypeHints = true,
								includeInlayVariableTypeHints = false,
								includeInlayPropertyDeclarationTypeHints = true,
								includeInlayFunctionLikeReturnTypeHints = true,
								includeInlayEnumMemberValueHints = true,
							},
						},
						javascript = {
							inlayHints = {
								includeInlayParameterNameHints = "all",
								includeInlayParameterNameHintsWhenArgumentMatchesName = false,
								includeInlayFunctionParameterTypeHints = true,
								includeInlayVariableTypeHints = true,
								includeInlayPropertyDeclarationTypeHints = true,
								includeInlayFunctionLikeReturnTypeHints = true,
								includeInlayEnumMemberValueHints = true,
							},
						},
					},
				},
				html = {},
				yamlls = {
					settings = {
						yaml = {
							keyOrdering = false,
						},
					},
				},
				lua_ls = {
					-- enabled = false,
					single_file_support = true,
					settings = {
						Lua = {
							workspace = {
								checkThirdParty = false,
							},
							completion = {
								workspaceWord = true,
								callSnippet = "Both",
							},
							misc = {
								parameters = {
									-- "--log-level=trace",
								},
							},
							hint = {
								enable = true,
								setType = false,
								paramType = true,
								paramName = "Disable",
								semicolon = "Disable",
								arrayIndex = "Disable",
							},
							doc = {
								privateName = { "^_" },
							},
							type = {
								castNumberToInteger = true,
							},
							diagnostics = {
								disable = { "incomplete-signature-doc", "trailing-space" },
								-- enable = false,
								groupSeverity = {
									strong = "Warning",
									strict = "Warning",
								},
								groupFileStatus = {
									["ambiguity"] = "Opened",
									["await"] = "Opened",
									["codestyle"] = "None",
									["duplicate"] = "Opened",
									["global"] = "Opened",
									["luadoc"] = "Opened",
									["redefined"] = "Opened",
									["strict"] = "Opened",
									["strong"] = "Opened",
									["type-check"] = "Opened",
									["unbalanced"] = "Opened",
									["unused"] = "Opened",
								},
								unusedLocalExclude = { "_*" },
							},
							format = {
								enable = false,
								defaultConfig = {
									indent_style = "space",
									indent_size = "2",
									continuation_indent_size = "2",
								},
							},
						},
					},
				},
				gopls = {
					setup = {
						cmd = { "gopls", "serve" }, -- use cmd in path, I can update it easily
						settings = {
						  gopls = {
							analyses = {
							  nilness = true,
							  unusedparams = true,
							  unusedwrite = true,
							  useany = true,
							},
							staticcheck = false
						  }
						},
						root_dir = require 'lspconfig'.util.root_pattern(".git", "go.mod", "go.work"),
						init_options = { usePlaceholders = true, completeUnimported = true },
					},
				},
			},
			setup = {},
		},
	},
}