return {
  "hrsh7th/nvim-cmp",
  dependencies = {
    "hrsh7th/cmp-nvim-lsp",
    "hrsh7th/cmp-buffer",
    "hrsh7th/cmp-path",
    "hrsh7th/cmp-cmdline",

    -- for vsnip users
    "hrsh7th/cmp-vsnip",
    "hrsh7th/vim-vsnip",
  },
  opts = function () 
    local cmp = require('cmp')
    return {
      mapping = cmp.mapping.preset.insert({
        ['<CR>'] = cmp.mapping.confirm({
          -- behavior = cmp.ConfirmBehavior.Insert,
          select = true,
        }),
        ['<C-e>'] = cmp.mapping.abort(),
        -- ['<Tab>'] = cmp.mapping(cmp.mapping.select_next_item(), { 'i', 's' }),
      }),
      snippet = {
        -- REQUIRED - you must specify a snippet engine
        expand = function(args)
          vim.fn["vsnip#anonymous"](args.body) -- For `vsnip` users.
          -- require('luasnip').lsp_expand(args.body) -- For `luasnip` users.
          -- vim.fn["UltiSnips#Anon"](args.body) -- For `ultisnips` users.
          -- require'snippy'.expand_snippet(args.body) -- For `snippy` users.
        end,
      },
      sources = cmp.config.sources({
        { name = 'nvim_lsp' },
      }, {
        {name = 'buffer'},
      }),
    }
  end
}