some question please for help

[alan-zhou]

i have install npm and run ios in xcode
error: /Users/u_wolf/Downloads/react-weather-master/ios/main.jsbundle: No such file or directory
in main.js some code is error
*****type State = {
store: any
};
function setup() {

class Root extends Component {
state: State; *******

ERROR TIPS : Types are not supported by current javaScript version

[stage88]

Hi, you may need to run react-native bundle in terminal from your project's root director