return {
  -- autocompletion and its sources and snippets
  "hrsh7th/nvim-cmp",
  dependencies = {
    "nvim-lua/plenary.nvim",
    "onsails/lspkind-nvim",
    -- cmp sources
    "hrsh7th/cmp-buffer",
    "hrsh7th/cmp-path",
    "uga-rosa/cmp-dictionary",
    "lukas-reineke/cmp-under-comparator",
    -- luasnip
    {
      "l3mon4d3/luasnip",
      config = function()
        require("luasnip.loaders.from_snipmate").lazy_load()
      end,
      version = "v2.*",
      build = "make install_jsregexp",
      dependencies = { "saadparwaiz1/cmp_luasnip" },
    },
  },
  config = function()
    local cmp = require("cmp")
    cmp.setup({
      sorting = {
        comparators = {
          cmp.config.compare.offset,
          cmp.config.compare.exact,
          cmp.config.compare.score,
          require("cmp-under-comparator").under,
          cmp.config.compare.kind,
          cmp.config.compare.sort_text,
          cmp.config.compare.length,
          cmp.config.compare.order,
        },
      },
      snippet = {
        expand = function(args)
          require("luasnip").lsp_expand(args.body)
        end,
      },
      mapping = {
        ["<S-Tab>"] = cmp.mapping(function(fallback)
          if cmp.visible() then
            cmp.select_prev_item()
          elseif require("luasnip").jumpable(-1) then
            require("luasnip").jump(-1)
          else
            fallback()
          end
        end, { "i", "s" }),
        ["<Tab>"] = cmp.mapping(function(fallback)
          if cmp.visible() then
            cmp.select_next_item()
          elseif require("luasnip").expand_or_jumpable() then
            require("luasnip").expand_or_jump()
          else
            fallback()
          end
        end, { "i", "s" }),
        ["<C-e>"] = cmp.mapping.close(),
        ["<CR>"] = cmp.mapping.confirm({
          behavior = cmp.ConfirmBehavior.Replace,
          select = true,
        }),
      },
      sources = {
        { name = "nvim_lsp" },
        { name = "luasnip" },
        { name = "path" },
        { name = "buffer" },
        { name = "dictionary" },
      },
      formatting = {
        format = require("lspkind").cmp_format({
          mode = "symbol_text",
          preset = "codicons",
          maxwidth = 50,
          menu = Menu_signs,
          symbol_map = Lsp_signs,
        }),
      },
    })
  end,
}