return {
  -- Autocompletion
  'hrsh7th/nvim-cmp',
  dependencies = {
    -- Snippet Engine & its associated nvim-cmp source
    'L3MON4D3/LuaSnip',
    'saadparwaiz1/cmp_luasnip',

    -- Adds LSP completion capabilities
    'hrsh7th/cmp-nvim-lsp',

    -- Adds a number of user-friendly snippets
    'rafamadriz/friendly-snippets',
  },
  config = function()
    -- See `:help cmp`
    vim.opt.completeopt = { 'menu', 'menuone', 'noselect' }
    require('luasnip.loaders.from_vscode').lazy_load()

    local cmp = require 'cmp'
    local luasnip = require 'luasnip'
    luasnip.config.setup {}

    local select_opts = { behavior = cmp.SelectBehavior.Select }

    cmp.setup {
      snippet = {
        expand = function(args)
          luasnip.lsp_expand(args.body)
        end,
      },
      sources = {
        { name = 'path' },
        { name = 'nvim_lsp', keyword_length = 1 },
        { name = 'buffer',   keyword_length = 3 },
        { name = 'luasnip',  keyword_length = 2 },
      },
      window = {
        documentation = cmp.config.window.bordered()
      },
      formatting = {
        fields = { 'menu', 'abbr', 'kind' },
        format = function(entry, item)
          local menu_icon = {
            nvim_lsp = 'λ',
            luasnip = '⋗',
            buffer = 'Ω',
            path = '🖫',
          }

          item.menu = menu_icon[entry.source.name]
          return item
        end,
      },
      mapping = cmp.mapping.preset.insert {
        ['<C-n>'] = cmp.mapping.select_next_item(),
        ['<C-p>'] = cmp.mapping.select_prev_item(),
        ['<C-b>'] = cmp.mapping.scroll_docs(-4),
        ['<C-f>'] = cmp.mapping.scroll_docs(4),
        ['<C-Space>'] = cmp.mapping.complete {},
        ['<CR>'] = cmp.mapping.confirm {
          behavior = cmp.ConfirmBehavior.Replace,
          select = true,
        },
        ['<Tab>'] = cmp.mapping(function(fallback)
          if cmp.visible() then
            cmp.select_next_item()
          elseif luasnip.expand_or_locally_jumpable() then
            luasnip.expand_or_jump()
          else
            fallback()
          end
        end, { 'i', 's' }),
        ['<S-Tab>'] = cmp.mapping(function(fallback)
          if cmp.visible() then
            cmp.select_prev_item()
          elseif luasnip.locally_jumpable(-1) then
            luasnip.jump(-1)
          else
            fallback()
          end
        end, { 'i', 's' }),
      },
    }

    local sign = function(opts)
      vim.fn.sign_define(opts.name, {
        texthl = opts.name,
        text = opts.text,
        numhl = ''
      })
    end

    sign({ name = 'DiagnosticSignError', text = '✘' })
    sign({ name = 'DiagnosticSignWarn', text = '▲' })
    sign({ name = 'DiagnosticSignHint', text = '⚑' })
    sign({ name = 'DiagnosticSignInfo', text = '»' })

    vim.diagnostic.config({
      virtual_text = false,
      severity_sort = true,
      float = {
        border = 'rounded',
        source = 'always',
      },
    })

    vim.lsp.handlers['textDocument/hover'] = vim.lsp.with(
      vim.lsp.handlers.hover,
      { border = 'rounded' }
    )

    vim.lsp.handlers['textDocument/signatureHelp'] = vim.lsp.with(
      vim.lsp.handlers.signature_help,
      { border = 'rounded' }
    )
  end,
}