return {
  -- extend auto completion
  {
    "hrsh7th/nvim-cmp",
    opts = function(_, opts)
      local cmp = require("cmp")
      opts.mapping = vim.tbl_deep_extend("force", opts.mapping, {
        ["<Down>"] = cmp.mapping.select_next_item({ behavior = cmp.SelectBehavior.Select }),
        ["<Up>"] = cmp.mapping.select_prev_item({ behavior = cmp.SelectBehavior.Select }),
        ["<C-j>"] = cmp.mapping.select_next_item({ behavior = cmp.SelectBehavior.Select }),
        ["<C-k>"] = cmp.mapping.select_prev_item({ behavior = cmp.SelectBehavior.Select }),
        ["<C-b>"] = cmp.mapping(cmp.mapping.scroll_docs(-1), { "i", "c" }),
        ["<C-f>"] = cmp.mapping(cmp.mapping.scroll_docs(1), { "i", "c" }),
        ["<C-Space>"] = cmp.mapping(cmp.mapping.complete(), { "i", "c" }),
        ["<C-e>"] = cmp.mapping({
          i = cmp.mapping.abort(),
          c = cmp.mapping.close(),
        }),
        -- Accept currently selected item. If none selected, `select` first item.
        -- Set `select` to `false` to only confirm explicitly selected items.
        ["<Tab>"] = cmp.mapping.confirm({ select = true }),
        -- Disabel Enter key for autocomplete
        ["<CR>"] = cmp.mapping.close(),
      })
    end,
  },
}