return {
    'hrsh7th/nvim-cmp',
    event = 'InsertEnter',
    dependencies = {
        'hrsh7th/cmp-vsnip',
        'hrsh7th/cmp-nvim-lsp',
        'hrsh7th/vim-vsnip',
        'hrsh7th/vim-vsnip-integ',
        'hrsh7th/cmp-buffer',
        'onsails/lspkind-nvim',
        'windwp/nvim-autopairs',
        'hrsh7th/cmp-cmdline',
    },
    config = function()
        local cmp = require('cmp')
        local types = require('cmp.types')
        local cmp_autopairs = require('nvim-autopairs.completion.cmp')
        local opts = {
            formatting = {
                format = function(entry, vim_item)
                    vim_item.kind = require('lspkind').presets.default[vim_item.kind] .. ' ' .. vim_item.kind

                    -- set a name for each source
                    vim_item.menu = ({
                        buffer = '[Buf]',
                        nvim_lsp = '[LSP]',
                        luasnip = '[Snip]',
                        nvim_lua = '[Lua]',
                        latex_symbols = '[Latex]',
                    })[entry.source.name]
                    return vim_item
                end,
            },
            window = {
                completion = cmp.config.window.bordered(),
                documentation = cmp.config.window.bordered(),
            },
            snippet = {
                expand = function(args)
                    vim.fn['vsnip#anonymous'](args.body)
                end,
            },
            mapping = cmp.mapping.preset.insert({
                ['<Tab>'] = cmp.mapping.select_next_item({ behavior = types.cmp.SelectBehavior.Select }),
                ['<S-Tab>'] = function(fallback)
                    local function input(keys, mode)
                        vim.api.nvim_feedkeys(vim.api.nvim_replace_termcodes(keys, true, true, true), mode or 'i', true)
                    end

                    if vim.fn.pumvisible() == 1 then
                        input('<C-p>', 'n')
                    elseif vim.fn['vsnip#jumpable']() == -1 then
                        input('<Plug>(vsnip-jump-prev)')
                    else
                        fallback()
                    end
                end,
                ['<C-y>'] = cmp.mapping.confirm({ behavior = cmp.ConfirmBehavior.Replace, select = true }),
                ['<CR>'] = function(fallback)
                    fallback()
                end,
                ['<C-e>'] = function(fallback)
                    fallback()
                end,
            }),
            completion = {
                completeopt = 'menu,menuone,noselect',
            },
            preselect = types.cmp.PreselectMode.None,
            sources = {
                { name = 'nvim_lsp' },
                { name = 'buffer' },
                { name = 'vsnip' },
            },
        }
        cmp.setup(opts)
        cmp.event:on('confirm_done', cmp_autopairs.on_confirm_done({ map_char = { tex = '' } }))
    end,
}