アローファンクションの引数の話

es6-function.md

かっこあり

const App = ({ history }) => (
  <Router history={history}></Router>
);

var App = function App(_ref) {
  var history = _ref.history;
  return React.createElement(Router, { history: history });
};

かっこなし

const App = (history) => (
  <Router history={history}></Router>
);

var App = function App(history) {
  return React.createElement(Router, { history: history });
};