{
  # Empty configuration
  empty = {
    plugins.nvim-cmp.enable = true;
  };

  snippetEngine = {
    plugins.nvim-cmp = {
      enable = true;
      snippet.expand = "luasnip";
    };
  };

  # All the upstream default options of nvim-cmp
  defaults = {
    plugins.nvim-cmp = {
      enable = true;

      performance = {
        debounce = 60;
        throttle = 30;
        fetchingTimeout = 500;
      };

      preselect = "Item";

      snippet = {
        expand.__raw = ''
          function(_)
            error('snippet engine is not configured.')
          end
        '';
      };

      completion = {
        keywordLength = 1;
        keywordPattern = ''\%(-\?\d\+\%(\.\d\+\)\?\|\h\w*\%(-\w*\)*\)'';
        autocomplete = ["TextChanged"];
        completeopt = "menu,menuone,noselect";
      };

      confirmation = {
        getCommitCharacters = ''
          function(commit_characters)
            return commit_characters
          end
        '';
      };

      formatting = {
        expandableIndicator = true;
        fields = ["abbr" "kind" "menu"];
        format = ''
          function(_, vim_item)
            return vim_item
          end
        '';
      };

      matching = {
        disallowFuzzyMatching = false;
        disallowFullfuzzyMatching = false;
        disallowPartialFuzzyMatching = true;
        disallowPartialMatching = false;
        disallowPrefixUnmatching = false;
      };

      sorting = {
        priorityWeight = 2;
        comparators = [
          "offset"
          "exact"
          "score"
          "recently_used"
          "locality"
          "kind"
          "length"
          "order"
        ];
      };

      sources = [];

      experimental = {
        ghost_text = false;
      };

      view = {
        entries = {
          name = "custom";
          selection_order = "top_down";
        };
      };

      window = {
        completion = {
          border = ["" "" "" "" "" "" "" ""];
          winhighlight = "Normal:Pmenu,FloatBorder:Pmenu,CursorLine:PmenuSel,Search:None";
          scrolloff = 0;
          colOffset = 0;
          sidePadding = 1;
          scrollbar = true;
        };
        documentation = {
          maxHeight = "math.floor(40 * (40 / vim.o.lines))";
          maxWidth = "math.floor((40 * 2) * (vim.o.columns / (40 * 2 * 16 / 9)))";
          border = ["" "" "" " " "" "" "" " "];
          winhighlight = "FloatBorder:NormalFloat";
        };
      };
    };
  };
}