return {

    -- completion
    {
        "saghen/blink.cmp",
        version = "*",
        config = function()
            require("blink.cmp").setup({
                completion = {
                    list = {
                        selection = {
                            preselect = false,
                            auto_insert = true,
                        },
                    },
                    documentation = {
                        window = { border = "rounded" },
                        auto_show = true,
                        auto_show_delay_ms = 50,
                    },
                    menu = {
                        border = "rounded",
                        draw = {
                            components = {
                                kind_icon = {
                                    text = function(ctx)
                                        local kind_icon, _, _ = require("mini.icons").get("lsp", ctx.kind)
                                        return kind_icon
                                    end,
                                    highlight = function(ctx)
                                        local _, hl, _ = require("mini.icons").get("lsp", ctx.kind)
                                        return hl
                                    end,
                                },
                                kind = {
                                    highlight = function(ctx)
                                        local _, hl, _ = require("mini.icons").get("lsp", ctx.kind)
                                        return hl
                                    end,
                                },
                            },
                        },
                    },
                },
                signature = {
                    window = { border = "rounded" },
                },
                snippets = { preset = "luasnip" },
                sources = {
                    default = { "lsp", "path", "snippets", "buffer" },
                    providers = {},
                },
                keymap = {
                    preset = "none",
                    ["<S-Tab>"] = { "select_prev", "snippet_backward", "fallback" },
                    ["<Tab>"] = { "select_next", "snippet_forward", "fallback" },
                    ["<CR>"] = { "accept", "fallback" },
                    ["<C-space>"] = { "hide", "show" },
                    ["<C-y>"] = { "show", "show_documentation", "hide_documentation" },
                    ["<C-u>"] = { "scroll_documentation_up", "fallback" },
                    ["<C-d>"] = { "scroll_documentation_down", "fallback" },
                },
            })
        end,
    },

    -- snippets
    {
        "L3MON4D3/LuaSnip",
        version = "*",
        dependencies = { "rafamadriz/friendly-snippets" },
        config = function()
            local luasnip = require("luasnip")
            require("luasnip.loaders.from_vscode").lazy_load()
            require("luasnip.loaders.from_vscode").lazy_load({
                paths = { vim.fn.stdpath("config") .. "/snippets" },
            })

            luasnip.filetype_extend("mdx", { "markdown" })
        end,
    },

    -- auto pairs
    {
        "windwp/nvim-autopairs",
        event = "InsertEnter",
        config = function()
            local npairs = require("nvim-autopairs")
            local Rule = require("nvim-autopairs.rule")
            local conds = require("nvim-autopairs.conds")

            npairs.setup()

            -- Autoclosing angle-brackets.
            npairs.add_rule(Rule("<", ">", {
                -- Avoid conflicts with nvim-ts-autotag.
                "-html",
                "-javascriptreact",
                "-typescriptreact",
            }):with_pair(conds.before_regex("%a+:?:?$", 3)):with_move(function(opts)
                return opts.char == ">"
            end))
        end,
    },

    -- auto tag
    {
        "windwp/nvim-ts-autotag",
        ft = {
            "html",
            "xml",
            "javascript",
            "typescript",
            "javascriptreact",
            "typescriptreact",
            "jsx",
            "tsx",
            "vue",
            "svelte",
            "markdown",
            "htmldjango",
        },
        event = "InsertEnter",
        lazy = true,
        config = function()
            require("nvim-ts-autotag").setup({
                enable_close = true,
                enable_rename = true,
                enable_close_on_slash = true,
            })
        end,
    },

    -- comment
    {
        "numToStr/Comment.nvim",
        dependencies = {
            "JoosepAlviste/nvim-ts-context-commentstring",
        },
        config = function()
            require("Comment").setup({
                pre_hook = require("ts_context_commentstring.integrations.comment_nvim").create_pre_hook(),
                mappings = {
                    basic = true,
                    extra = true,
                },
            })
        end,
        keys = {
            { "gcc", mode = "n",          desc = "Toggle comment line" },
            { "gc",  mode = { "n", "o" }, desc = "Toggle comment linewise" },
            { "gc",  mode = "x",          desc = "Toggle comment linewise (visual)" },
            { "gbc", mode = "n",          desc = "Toggle comment block" },
            { "gb",  mode = { "n", "o" }, desc = "Toggle comment blockwise" },
            { "gb",  mode = "x",          desc = "Toggle comment blockwise (visual)" },
        },
    },

    -- treesitter
    {
        "nvim-treesitter/nvim-treesitter",
        build = ":TSUpdate",
        event = { "BufReadPost", "BufNewFile" },
        config = function()
            require("nvim-treesitter.configs").setup({
                ensure_installed = require("config.extensions").ts_parsers,
                auto_install = true,
                highlight = {
                    enable = true,
                    additional_vim_regex_highlighting = true,
                },
                indent = {
                    enable = true,
                },
            })
        end,
    },
}