nvim/lua/plugs/nvimtree.lua

return {
  'kyazdani42/nvim-web-devicons',
  {
    "nvim-tree/nvim-tree.lua",
    config = function ()

      require'nvim-tree'.setup {
        sort_by = "case_sensitive",
        view = {
          width = 30,
        },
        filters = { dotfiles = true, },
        git     = { enable   = true },
        on_attach = function (bufnr)
          local api = require'nvim-tree.api'
          api.config.mappings.default_on_attach(bufnr)

          -- override a default
          G.delmap({
            {'n', '<C-e>', { buffer = bufnr }},
          })

        end
      }
      G.map({
        {"n", "<C-e>", ":NvimTreeToggle<CR>", { noremap = true }},
      })
    end
  }
}