return {
  {
    "neovim/nvim-lspconfig",
    config = function ()
      require'lspconfig'.lua_ls.setup(require('lsp.lua'))
    end
  },
  {
    "williamboman/mason.nvim",
    config = function()
      require("mason").setup({})
    end
  },
  {
    'hrsh7th/cmp-nvim-lsp', -- { name = 'nvim_lua' }
    'hrsh7th/cmp-buffer',   -- { name = 'buffer' },
    'hrsh7th/cmp-path',     -- { name = 'path' }
    'hrsh7th/cmp-cmdline',  -- { name = 'cmdline' }
    'hrsh7th/cmp-vsnip',
    {
      'onsails/lspkind-nvim',
      config = function()
        require('lspkind').init({
            mode = 'symbol_text',
            preset = 'codicons',
            symbol_map = {
              Text = "󰉿",
              Method = "󰆧",
              Function = "󰊕",
              Constructor = "",
              Field = "󰜢",
              Variable = "󰀫",
              Class = "󰠱",
              Interface = "",
              Module = "",
              Property = "󰜢",
              Unit = "󰑭",
              Value = "󰎠",
              Enum = "",
              Keyword = "󰌋",
              Snippet = "",
              Color = "󰏘",
              File = "󰈙",
              Reference = "󰈇",
              Folder = "󰉋",
              EnumMember = "",
              Constant = "󰏿",
              Struct = "󰙅",
              Event = "",
              Operator = "󰆕",
              TypeParameter = "",
            },
        })
      end
    },
    {
      "hrsh7th/nvim-cmp",
      config = function()
        local has_words_before = function()
          unpack = unpack or table.unpack
          local line, col = unpack(G.api.nvim_win_get_cursor(0))
          return col ~= 0 and G.api.nvim_buf_get_lines(0, line - 1, line, true)[1]:sub(col, col):match('%s') == nil
        end
        local cmp     = require('cmp')
        local lspkind = require('lspkind')
        cmp.setup {
          sources = cmp.config.sources({
            { name = 'nvim_lsp' },
            { name = 'buffer' },
            { name = 'path' },
            { name = 'cmdline' },
            {name = 'vnsip'},
          }),
          mapping = cmp.mapping.preset.insert({
            ['<CR>'] = cmp.mapping.confirm({ select = true }), -- Accept currently selected item. Set `select` to `false` to only confirm explicitly selected items.
            ['<Tab>'] = function(fallback)
              if not cmp.select_next_item() then
                if vim.bo.buftype ~= 'prompt' and has_words_before() then
                  cmp.complete()
                else
                  fallback()
                end
              end
            end,

            ['<S-Tab>'] = function(fallback)
              if not cmp.select_prev_item() then
                if vim.bo.buftype ~= 'prompt' and has_words_before() then
                  cmp.complete()
                else
                  fallback()
                end
              end
            end,

          }),
          window = {
            completion = {
              winhighlight = "Normal:Pmenu,FloatBorder:Pmenu,Search:None",
              col_offset   = -3,
              side_padding = 0,
            },
          },
          fomatting = {
            format = lspkind.cmp_format({
              mode = 'symbol', -- show only symbol annotations
              maxwidth = 50, -- prevent the popup from showing more than provided characters (e.g 50 will not show more than 50 characters)
              ellipsis_char = '...', -- when popup menu exceed maxwidth, the truncated part would show ellipsis_char instead (must define maxwidth first)
              before = function (_, vim_item)
                return vim_item
              end
            })
          },
          snippet = {
            expand = function(args)
              vim.fn["vsnip#anonymous"](args.body)
            end,
          },
        }
      end,
  }
 }
}