return {
  {
    "hrsh7th/nvim-cmp",
    event = "InsertEnter",
    config = function()
      local cmp = require("cmp")

      local has_words_before = function()
        local line, col = unpack(vim.api.nvim_win_get_cursor(0))
        return col ~= 0
            and vim.api.nvim_buf_get_lines(0, line - 1, line, true)[1]
            :sub(col, col)
            :match("%s")
            == nil
      end

      local luasnip = require("luasnip")

      cmp.setup({
        snippet = {
          expand = function(args)
            require("luasnip").lsp_expand(args.body)
          end,
        },
        mapping = {
          ["<Tab>"] = cmp.mapping(function(fallback)
            if cmp.visible() then
              cmp.select_next_item()
            elseif luasnip.expand_or_jumpable() then
              luasnip.expand_or_jump()
            elseif has_words_before() then
              cmp.complete()
            else
              fallback()
            end
          end, {
            "i",
            "s",
          }),
          ["<S-Tab>"] = cmp.mapping(function(fallback)
            if cmp.visible() then
              cmp.select_prev_item()
            elseif luasnip.jumpable(-1) then
              luasnip.jump(-1)
            else
              fallback()
            end
          end, {
            "i",
            "s",
          }),
          ["<CR>"] = cmp.mapping.confirm({
            behavior = cmp.ConfirmBehavior.Replace,
            select = true,
          }),
        },
        formatting = {
          format = function(entry, vim_item)
            -- set a name for each source
            vim_item.menu = ({
              path = "[Path]",
              nvim_lsp = "[LSP]",
              luasnip = "[LuaSnip]",
              dap = "[dap]",
            })[entry.source.name]
            return vim_item
          end,
        },
        sources = {
          { name = "nvim_lsp" },
          { name = "luasnip" },
          { name = "path" },
          { name = "nvim_lsp_signature_help" },
        },
      })

      require "cmp".setup.filetype(
        { "dap-repl", "dapui_watches", "dapui_hover" }, {
          sources = {
            { name = "dap" },
          },
        })

      local cmp_autopairs = require 'nvim-autopairs.completion.cmp'
      cmp.event:on('confirm_done', cmp_autopairs.on_confirm_done())
    end,
    dependencies = {
      "hrsh7th/cmp-nvim-lsp",
      "hrsh7th/cmp-path",
      "hrsh7th/cmp-nvim-lsp-signature-help",
      "rcarriga/cmp-dap",
      "windwp/nvim-autopairs",
      {
        "saadparwaiz1/cmp_luasnip",
        dependencies = {
          {
            "L3MON4D3/LuaSnip",
            event = "InsertCharPre",
            keys = {
              { "<c-j>", function() require "luasnip".jump(1) end,  mode = "i" },
              { "<c-k>", function() require "luasnip".jump(-1) end, mode = "i" },
            },
            config = function()
              require("luasnip/loaders/from_vscode").lazy_load()
            end,
            dependencies = {
              "kitagry/vs-snippets",
              "rafamadriz/friendly-snippets",
              "kkonghao/snippet-dog",
            },
          }
        },
      },
    },
  },
}