return {
  'hrsh7th/cmp-buffer', -- nvim-cmp source for buffer words
  'hrsh7th/cmp-path', -- completion pathname
  'hrsh7th/cmp-nvim-lsp', -- nvim-cmp source for neovim's built-in LSP
  {
    'hrsh7th/nvim-cmp', -- Completion
    config = function()
      local cmp = require 'cmp'
      local lspkind = require 'lspkind'
      local luasnip = require 'luasnip'

      local has_words_before = function()
        if vim.api.nvim_buf_get_option(0, "buftype") == "prompt" then return false end

        local line, col = unpack(vim.api.nvim_win_get_cursor(0))
        return col ~= 0 and vim.api.nvim_buf_get_text(0, line-1, 0, line-1, col, {})[1]:match("^%s*$") == nil
      end

      cmp.setup({
        snippet = {
          expand = function(args)
            require('luasnip').lsp_expand(args.body)
          end,
        },
        mapping = cmp.mapping.preset.insert({
          ["<Tab>"] = vim.schedule_wrap(function(fallback)
            if cmp.visible() and has_words_before() then
              cmp.select_next_item({ behavior = cmp.SelectBehavior.Select })
            elseif luasnip.expand_or_jumpable() then
              luasnip.expand_or_jump()
            else
              fallback()
            end
          end),
          ["<S-Tab>"] = cmp.mapping(function(fallback)
            if cmp.visible() then
              cmp.select_prev_item()
            elseif luasnip.jumpable(-1) then
              luasnip.jump(-1)
            else
              fallback()
            end
          end, { "i", "s" }),
          ['<C-d>'] = cmp.mapping.scroll_docs(-4),
          ['<C-f>'] = cmp.mapping.scroll_docs(4),
          ['<C-Space>'] = cmp.mapping.complete(),
          ['<C-e>'] = cmp.mapping.close(),
          ['<CR>'] = cmp.mapping.confirm({
            behavior = cmp.ConfirmBehavior.Replace,
            select = true
          }),
        }),
        sources = cmp.config.sources({
          { name = 'nvim_lsp' },
          {
            name = 'buffer',
            option = {
              get_bufnrs = function ()
                return vim.api.nvim_list_bufs()
              end
            }
          },
          { name = 'path' },
          { name = 'luasnip' }
        }),
        formatting = {
          format = lspkind.cmp_format({ with_text = false, maxwidth = 50 })
        }
      })

      vim.cmd [[
      set completeopt=menuone,noinsert,noselect
      highlight! default link CmpItemKind CmpItemMenuDefault
      ]]
    end,
  },
}