Inside nvim.

return {
   "hrsh7th/nvim-cmp",
   event = "InsertEnter",
   dependencies = {
      "hrsh7th/cmp-buffer", -- source for text in buffer
      "hrsh7th/cmp-path", -- source for file system paths
      {
         "L3MON4D3/LuaSnip",
         -- follow latest release.
         version = "v2.*", -- Replace <CurrentMajor> by the latest released major (first number of latest release)
         -- install jsregexp (optional!).
         build = "make install_jsregexp",
      },
      "saadparwaiz1/cmp_luasnip", -- for autocompletion
      "rafamadriz/friendly-snippets", -- useful snippets
      "onsails/lspkind.nvim", -- vs-code like pictograms
   },
   config = function()
      local cmp = require("cmp")
      local luasnip = require("luasnip")
      local lspkind = require("lspkind")

      -- loads vscode style snippets from installed plugins (e.g. friendly-snippets)
      require("luasnip.loaders.from_vscode").lazy_load()

      cmp.setup({
         window = {
            completion = cmp.config.window.bordered({
               border = "rounded",
               winhighlight = "Normal:Pmenu,FloatBorder:FloatBorder,CursorLine:PmenuSel,Search:None",
            }),
            documentation = cmp.config.window.bordered({
               border = "rounded",
               winhighlight = "Normal:NormalFloat,FloatBorder:FloatBorder,CursorLine:PmenuSel,Search:None",
            }),
         },
         completion = {
            completeopt = "menu,menuone,preview,noselect",
         },
         snippet = { -- configure how nvim-cmp interacts with snippet engine
            expand = function(args)
               luasnip.lsp_expand(args.body)
            end,
         },
         mapping = cmp.mapping.preset.insert({
            ["<C-k>"] = cmp.mapping.select_prev_item(), -- previous suggestion
            ["<C-j>"] = cmp.mapping.select_next_item(), -- next suggestion
            ["<C-b>"] = cmp.mapping.scroll_docs(-4),
            ["<C-f>"] = cmp.mapping.scroll_docs(4),
            ["<C-Space>"] = cmp.mapping.complete(), -- show completion suggestions
            ["<C-e>"] = cmp.mapping.abort(), -- close completion window
            ["<CR>"] = cmp.mapping.confirm({ select = false }),
         }),
         -- sources for autocompletion
         sources = cmp.config.sources({
            { name = "nvim_lsp" },
            { name = "luasnip" }, -- snippets
            { name = "buffer" }, -- text within current buffer
            { name = "path" }, -- file system paths
         }),

         -- configure lspkind for vs-code like pictograms in completion menu
         formatting = {
            fields = { "abbr", "kind", "menu" },
            format = lspkind.cmp_format({
               mode = "symbol_text",
               maxwidth = 50,
               ellipsis_char = "...",
               menu = {
                  nvim_lsp = "[LSP]",
                  luasnip = "[SNP]",
                  buffer = "[BUF]",
                  path = "[PATH]",
               },
            }),
         },
      })
   end,
}