npm run dev-server

[Ulisesgtz]

I install grommet-cli on my project and when i use the command npm run dev-server i got this error:

[nodemon] 1.13.3
[nodemon] to restart at any time, enter rs
[nodemon] watching: .
[nodemon] starting node ./server/dev src/js/index.js
(function (exports, require, module, __filename, __dirname) { import 'whatwg-fetch';
^^^^^^

SyntaxError: Unexpected token import
at createScript (vm.js:80:10)
at Object.runInThisContext (vm.js:139:10)
at Module._compile (module.js:599:28)
at Object.Module._extensions..js (module.js:646:10)
at Module.load (module.js:554:32)
at tryModuleLoad (module.js:497:12)
at Function.Module._load (module.js:489:3)
at Function.Module.runMain (module.js:676:10)
at startup (bootstrap_node.js:187:16)
at bootstrap_node.js:608:3
[nodemon] app crashed - waiting for file changes before starting...

i check on my node_module and i have the folder whatwg-fetch, i use the npm rebuild whatwg-fetch and the problem still, anyone know something about this?