admin: Uncaught SyntaxError: Unexpected token import

After i edit the src/App.js with the example in the Getting Started, i get this error : Uncaught SyntaxError: Unexpected token import

It originates from the line import _AdminBuilder from './AdminBuilder';

Seen here :

/* 268 */
/*!*******************************************!*\
  !*** ./~/api-platform-admin/lib/index.js ***!
  \*******************************************/
/***/ function(module, exports) {

	import _AdminBuilder from './AdminBuilder';
	export { _AdminBuilder as AdminBuilder };
	import _Create from './Create';
	export { _Create as Create };
	import _Edit from './Edit';
	export { _Edit as Edit };
	import _fieldFactory from './fieldFactory';
	export { _fieldFactory as fieldFactory };
	import _inputFactory from './inputFactory';
	export { _inputFactory as inputFactory };
	import _List from './List';
	export { _List as List };
	import _Show from './Show';
	export { _Show as Show };

	export * from './hydra';

I also get several warnings from the yarn add api-platform-admin command :

 yarn add api-platform-admin
yarn add v0.27.5
[1/4] Resolving packages...
warning api-platform-admin > lodash.isarray@4.0.0: This package is deprecated. Use Array.isArray.
[2/4] Fetching packages...
warning fsevents@1.0.17: The platform "linux" is incompatible with this module.
info "fsevents@1.0.17" is an optional dependency and failed compatibility check. Excluding it from installation.
warning fsevents@1.1.2: The platform "linux" is incompatible with this module.
info "fsevents@1.1.2" is an optional dependency and failed compatibility check. Excluding it from installation.
[3/4] Linking dependencies...
[4/4] Building fresh packages...
success Saved lockfile.
success Saved 66 new dependencies.

Could it come from these ?

Regards,